Celestron Dacl"fl"c ... the world's leading manufacturer of quality Schmidt-Cassegrainr I telescopes presents the two most popular of its extensive line

the Celestron 8 and the Celestron 5

The Celestron 8 multipurpose telescope with its 8-inch clear apertureand 80-inch effective focal length causes faint celestial objects toappear 500 times brighter than to the unaided eye and it offers aresolution capability of 1/2 arc second. Its useful magnification rangeis 50 to 500 power. The performance of a massive and highly versa-tile observatory telescope is packed into this compact instrument thatswings down to an easily portable 9x 12x22 inches and which weighsonly 23 pounds. Included in this size is the sharpest available opticalsystem for astronomical and terrestrial viewing as well as a mountand drive system engineered for the ultimate in convenience andmanufactured to precision standards. The fork mOunt of the Celestron8 provides excellent stability for high power viewing and for guidedphotographic exposures. It includes a highly accurate electric drivesystem which automatically tracks the stellar motion of objects beingobserved. Precision setting circles which assist you in dialing in thecoordinates of the many fascinating deep-sky objects are standard.Educators please take note: The Celestron 8 readily lends itself toassignments such as plotting the various Apollo landing sites, timinga shadow transit across the face of Jupiter, measuring the stellardensity of a Galactic Cluster, studying the spectral distribution ofsome of the brighter stars, making a photographic record of the phasechanges of Venus, and many other such assignmellls even under theadverse lighting conditions of your campus. Base price $895.00.

The recently introduced Celesrron 5 scales down to five inches ofclear aperture all of the fine features of the Celestron 8. It causesfailll celestial objects to appear 188 times brighter than to the un-aided eye and its resolution is 0.8 arc seconds. If your interest inastronomy is something less than all-encompassing, but you want thefinest available multipurpose telescope to observe fine detail on theMoon, study the planets, observe brilliant galactic clusters of starsand some of the brighter nebulae; if you walll a super-portable instru-melll to take with you on camp-outs to study a pine cone at 1000 feet,to close in whisker-to-whisker on a saucy squirrel or to capture anyof these on film - then the Celestron 5 may be your telescope. Thiscompact instrumelll with its 1250-mm. - fllO mirror lens opticsswings down to 6x8x16 inches and weighs only 12 pounds completewith fork mount and electric clock drive. Photographers please takenote: The Celestron 5 tube assembly weighing only 3V2 pounds de-mOUlllS from its fork and adapts to most 35-mm. SLR camera bodiesfor hand held or tripod mounted 25X telephoto shots. Your photosif shot with reasonable care through the Celestron 5 will be sharpwith perfect color rendition to the corners of your 35-mm. negatives.The full price of the Celestron 5 is $595.00 including an attractiveinstrument carrying case.

What other single purchase can you make that will give you the pride of ownership and thesatisfaction of knowin g that you have in your Celestron the ultimate in optical precision andmechanical execution? It is truly a prestigious instrument and will become a complete entertain-ment center for you and your friends and family. The fascinating hobby of astronomy is an outletthat can involve the bright but restless minds of your youngsters with dad in a hobby that in oneencompasses the history of man and embraces the thresholds of science.

The perfectly figured Schmidt-Cassegrain lens system is capable of sharperimages over a wider field than any other lens system. No other manufactureroffers a Schmidt-Cassegrain telescope of quality comparable to the Celestron.

Optical diagram of the Celestron Schmidt Casse·grain lens system: The light enters the systemthrough a thin aspheric corrector lens (a); it isthen reflected by a large spherical primary mirror(b) toward the prime focus (c). The light fromthe primary is intercepted by the convex secondarymirror (d) and reflected back through a hole inthe primary mirror to the Cassegrain focus (e).The effect of folding the optical path back with aconvex secondary mirror also increases the effec·tive focal length by a factor of three to seventimes that of the primary alone.

Optical testing and Guarantee - Each of thethree components in the objective system of theCelestron (primary mirror, secondary mirror, and

Schmidt corrector) are manufactured to such exact·ing standards that good performance could beachieved by simply randomly assembling thesecomponents into a telescope. We are not satisfiedwith just good performance, however. We there·fore set up each of these optical systems in a lasercollimator capable of detecting 11100lh waveerrors. We then carefully hyperbolize the secondarymirror to bring the optical system of each Celestronto a perfect optical null. The Celestron opticalguarantee is as follows: using a point source atinfinity (star test) and with the system properlycollimated, a knife edge shall indicate a clean op-tical null; when tested with a l00-line Ronchi grot·ing with three lines intercepting the cone, theshadow bands shall appear straight. The intra andextra·focal diffraction pallerns shall appear similarin regard to the central obstruction using a 12%mm ocular with the out-of-focus blur circle filling'!J of the field. Further, each Celestron is guaran-teed to be free from defects in material and work-manship for a period of one year subject to repairor replacement at our factory.

Comparison of Cassegrain Systems

The modern computer, in ray-trace techniques,provides an excellent method for evaluating theoff-axis performance of a lens system. The illus-tration above is from an article by James Wiley,

Sky and Telescope, April 1962. It gives the resullsof a computer ray trace of the several folded opti-cal systems at 1/60 and 1/30 off axis. Each dot inthe pallern is the point at the focal plane throughwhich a given ray through the system will pass.The spread of these dots indicates the amount ofdistortion. For convenience in evaluating the dis-tortion, the small circle in the lower left of theillustration is the size of the Airy disc for thesystem checked. It is evident from these ray trac-ings that the Celestron Schmidt-Cassegrain theo-retically produces the sharpest images across theentire focal plane.

What size telescope best suits your needs? IIisn't necessarily the largest and most expensiveinstrument that will give you the most utility andenjoyment. You must carefully evaluate your in-terests and balance these against your budget inselecting your telescope.

The School - One telescope is beller than none.Consider the Celestron 5 or Celestran 8. The typi-cal community college offering an astronomy ob-serving course to a class of perhaps 30 students isbest advised to install one large observatory instru-ment and several smaller instruments for individ-ual student groups. An installation might includea dome mounted Celestron 16, 3 Celestron 8's,and 7 Celestron 5's.

The Serious Amateur Astronomer - Do notconsider a telescope of less than 6-inch aperture.A smaller instrument limits you to observing dou-ble and variable stars, observing the planets andMoon. With the Celestron 8 and larger instru-ments, Globular clusters are easily resolved,planetary photography is a snap, and many ofthe deep-sky nebulae can be studied.

The Astrophotographer - the Celestron 8 orlarger with its optional off-axis guiding system,piggy back 5112" f/1.65 Schmidt camera, andpiggy back mount for your 35mm camera, is thecomplete photographic set-up for deep sky pho-tography. II allows you to simultaneously shoot0.65 x 1 0 f /1 0 at the Cassegrain focus, 51j2 x 80

f/1.65 with the Schmidt camera, and 25 x 380

sections of the sky' with the piggy-back mounted35mm carr.era with a 50mm taking lens.

The casual telescope enthusIast - if your in-terest is divided between daytime viewing, naturestudies, bird watching; but you want a telescopethat will compete with the finest for astronomical'viewing; then you may choose between the Celes-tron 8 or the Celestron 5.

The te/ephotographer - The Celestran 5 is de-signed as the optimum daytime viewing and tele-photographers instrument. II gives excellent 25Xtelephoto shots and its fast f/10 speed allows youto demount it from the fork mount for hand-heldaction shots.

The different kinds of telescopes.

Which is best - the reflector or refractor? Is thisthe question that you are wrestling with in yoursearch for a telescope that best suits your needs?Search no longer! There is an optical system avail-able to you that combines the good features of baththe reflector and refractor and eliminates all of thebad features of eac-h. It is the Schmidt-Cassegrain

compound catadioptric. Shown below, drawn all tothe same scale, are the optical diagrams of theseveral different telescopes offered on today's mar-ket. Each is an 8" II 10 drawn to 1118 actual size.The refractor telescope is found principally in thesmall two-inch imports flooding the departmentstores and touted to be a 450 power instrument. Itsprinciple advantage is in its rugged low-mainte-nance closed tube design and its low cost. Therefractor suffers from serious color fringing andsevere coma at the edges of the field. It is nolonger offered in larger apertures due to the factthat it cannot compete in performance and pricewith modern reflector telescopes. Further, the highpower claims are really jus emp y magnification.

f/ 10 Refrac or Telescope=---F:_: --~-~--:. -~~• f/1 0 Newtonian Reflector

=~c::5'-f/4 - f/10 Cassegrain

f/ 10 Maksutov-Cassegrain 1/10 Schmidt-Cassegrain

The Newtonian reflector presents an excellentvalue for the economy seeker of large aperture. Theimages are free from calor distortion, but sufferfrom off-axis coma. The long tube design requiresa large and massive mount to achieve a reason-able degree of stability. The long tube Newtonian.is seldom considered for a public observatory dueto the danger to the observer at the top of the longtube and the fact thot the delicate first surfacemirrors are susceptible to contamination.

The Cassegrain reflector telescope uses a shortfocal length parabolic mirror in conjunction with asmall hyperbolic secondary mirror. The combina-tion gives the same performance as the long tubeNewtonian but in a more compact size requiringa for less massive mount for the same degree ofstability. It also places the eyepiece at a moreconvenient position. The disadvantages of theCassegrain reflector telescope are the difficulty inparabolizing the short focal length primary mirrorto the required degree of accuracy and the opentube construction which also exposes the mirrorsto contamination. It also suffers coma to the samedel'lree as the equivalent Newtonian.'The compound catadioptric lens system is a Co sse-grain reflector which uses a spherical primary mir-ror and a refractive element whose sale function isto correct for spherical aberrations. The more popu·

lor of catadioptrics are the Maksutov and theSchmidt. In both systems the low-power correctoris placed at the entry aperture of the system, there-by closing the tube and protecting the first surfacemirrors. As shown in the ray tracings above, theMaksutof suffers from even more severe coma than

a corresponding Straight Cassegrain or Newtonian;and further, due to the thick miniscus corrector lens,it has a slight color distortion. The Schmidt-Casse-grain alone is capable of diffraction limited per-formance over a relatively wide flat field.

Deep Sky Photography with the Ce/estron 8- by for the most rewarding photographic en-deavors that the amateur astronomer can undertakeare guided photographs of star clouds in the MilkyWay regions, clusters of stars and nebulosity sur-rounding groups such as the Pleiades. The photo-graphic system to which the Celestron 8 may beexpanded is the simplest but most versatile offeredby any telescope man'ufacturer. First, using the off-axis guiding eyepiece camera adaptor, clustersand individual "Messier" objects can be shot on35mm negs. with a camera body at the 80" Casse·grain focus. Exposures of 30 seconds will capturemost of the stars in an open cluster such as thedouble in Perseus, while guided exposures of 5minutes will do for the Globular cluster M 13. TheGreat Nebula in Orion can be completely burnedin_by a 5'lT1inute exposure. Simultaneously, a widefield photograph may be made of extraordinarilygood quality with a camera mounted on the side ofthe Celestron 8 with the piggyback camera mount.The most striking photos using the Celestran 8photographic system, having quality rivaling thoseof the major professional observatories, are madeon 35mm negatives using the piggyback mountedCelestron 5%" Schmidt Camera. It provides a5% 0 x 8 % 0 field with the exceptionally fastphotographic speed of f/1.65.

Photo down the barrel ofthe Celestron 8 with the225mm - f/1.65 SchmidtCamera, and a Canon FT50mm - f/1.8 mountedpiggyback for Deep skyphotography.

SPECIFICATIONS

Celestron 5 8 14 16 22Light Grasp - compared 188 510 1760 2060 3900

to unaided eye

Cassegrain Focal Length 1250mm 2000mm 3920mm 4500mm 5600mm50" 80" 154" 180" 220"

Useful Magnification 30 to 300X 50 to 500X 50 to 850X 60 to 900X 70 to 1300X

Resolution - 0.8 are see 0.5 are see 0.28 are see 0.25 are see 0.20 are seeTheoretical limit 1971ines/mm 210lines/mm 171 lines/mm 179 lines/ mm 200lines/mm

Airy Disc Brilliance 4.2 27.5 256 430 2900Factor at 160 power

Faintest Stellar Magnitude 13.5 14.4 15.4 15.6 ,16.2

Photographic Speed f/1 0 f/10 f/11 f/11 f/10

Image Scale 1.12°/inch .72 ° / inch .3JO linch .318°/inch .26° linch

Field - @ 30 feet 7" 4.5"35mm format 100 feet 23.5" 15.2"Lang Dim. 1000 feet 19.6' 12.6' 6.4' 5.5' 4.2'

Unvignetted field 1.8/J circle 2.75" circ:e 311 circle 3.5" circle 4" circle

Near Focus 20' 25' 500' 500' 1000'

Secondary Obstruction 2" 23/4 " 4Y," 5" 6Y2"

Finder Scope 5X - 25mm 6X - 30mm 10X-40mm lOX - 40mm 10X-40mm

Eyepieces included 25mm - 50X 40mm - 50X set of 4 set of 5 set of 5

in base price 12'hmm - 100X 25mm - 80X

Setting Circle R.A. 6'/4 " 8" 9Y," 13" 13"Diameter Dee. 4" 4" 6" 14" 14"

Drive Gear Dio. 4'12" 6" 6%" 12%" 12%"

Clock Power 11 Ov, 60Hz. 6 Watts 6 Watts 10 Watts 35 Watts 35 Watts

Weight 121bs. 231bs. 1001bs. 750 Ibs. 10001bs.

Size - swung down 7x8x16" 9x12x22" 18 x 22 x 44"

Color Scheme Or - 8rn Or - Brn Or- Brn Blu - Wh

Shipping Weight 201bs. 48 Ibs. 2001bs. 10001b,. 1200 Ibs.

Base Price $595.00 $895.00 $3600.00 $12,900.00 $20,000.00

Celestron 8-Base Price .... $895.00Shi,pping charges COD by JET Air Freight $10 to$50 depending on your location. Included in thebase price of the Celestron 8 are all of the itemslisted in the specification block. You receive acomplete working telescope for astronomical orterrestrial viewing. Plans are included with theCelestron 8 showing you how to make a backyardpier or wedge to tilt the instrument up to yourlatitude angle for astronomical viewing, or youmay wish to purchase one of the optional wedgeor pier assemblies shown below,

Optional AccessoriesTable-Top Wedge Assembly-Cast aluminum to till

the Celestron 8 up to your latitude angle. Ad-justable from 20° to 50° $50.00

Wedge Assembly for pipe column. Fits into top ofan 8" - Yo" wall pipe. . . . . . . . . . . .. 50.00

Additional Oculars-l'/4" barrel Orthoscopic,180101 - 112X; 12'120101 - 160X;90101 - 222X; 60101 - 333X ea. 22.50

Prism Diagonal (if you want an extra) .. 15.00Inconel coated Solar filters for safe viewing of thesun, 0.01 % transmission.Solar Filter-3" off axis . . . . . . . . . . .. 75.00Solar Filter-8" full aperture 200.00

T-Mount Camera Adaptor.......... 15.00Camera Rings to couple your camera to the T-

Mount adaptor-Exacta, Canon, Minolta, NikonPentox, Mirando, Konica- each " 6.50

Tele-Extender (eyepiece projection) 15.00Off-Axis Guiding Camera Adaptor with 12'12 0101

illuminated reticle eyepiece. . .100.00Illuminated Reticle Eyepiece, 12'12 0101.... 45.00Piggyback Camera Mount . . . . . . . .. 25.00Counterweight Set-includes six weights.. 25.00Enhanced coatings on reflective surfaces increases

transmission by 4 % . . . . . . . . . . . . . .. 25.00Broadband VLR coating on corrector. Increases

transmission by 9'12% 60.00

Celestron 5 base price. . . . . . . .. . ... $595.00The instrument is shipped by JET Air Freight withthe shipping charges collect. ($5 to $25 depend-ing on your location). The Celestron 5 supplied atthe base price brings you a complete workingtelescope. All of the specification and accessoryitems listed in the specification block are included.The instrument is delivered to you in a handsomecarrying case.

Ocular accessories for the Celestron 5 are 24 Y2 0101barrel diameter-Replacement eyepieces 250101and 12 Y2 0101 each . . . . . . . . 15.00

Prism Diagonal-replacement 12.50

Optional AccessoriesRigid Wedge Assembly. . . . . . $40.00Piggyback Camera Mount $20.00Barlow Lens-2X (doubles magnification). 15.00Porro Prism-straight through erecting system. This

is the recommended erector for theCelestron 5 . . . 20.00

Zoom erector-8 to 20mm-gives excellent eye re-lief for doy-time viewing but slightly compro-mises the Celestron 5 due to the large numberof elements . . . . . . . . . . . . 35.00

T-Mount Camera adaptor. .. 15.00Camero rings .... see listing uncf>r Celestron 8

Visual Back 1 % "-converts the Celestron 5 foruse with standard 1 '/4" oculars. . 15.00

Portable Pier with Wedge-8" pipe column withremovable cast aluminum legs. . 200.00

Counterweight set (4 weights) . . 20.0ClSolar Filter-2" off axis . . . . 50.00Solar Filter-5" full aperture ... . .. 125.00Enhanced coatings on reflective surfaces increase

transmission by 4 % 15.00Broadband VLR coatings on carrector-increases

transmission by 9.5% .. 35.00

Drive corrector. Operates from 1 2-volt battery andprovides 110v, 60Hz. with fast and slow but-tons for field use and guiding ..... $85.00

The Airy Disc Brilliance Factor.

This rating of telescopes of difference aperturetakes into consideration the seeing conditionswhich occasionally limit the magnification at whichlarge telescopes can be used. It is based on theassumption that telescopes of different aperturebut comparably good quality will be tested at theactual magnification at which they are used byobservers to view abjects of greatest interest. Asan illustration, the Glabular Cluster M 13 is bestviewed at about 160 power. The individual starsin this cluster are clearly resolved in an 8-inchtelescope. In a 4-inch telescope, however, thewhole cluster is an amorphous blob. The reasonfor this is as follows, if you double the apertureof a telescope, you collect 4 times as much light.In doubling the aperture, however, you concen-trate the light into an Airy disc having '12 thediameter or '/4 the area. In short this means thatfaint stellar images appear 16 times brighter ifyou double the aperture of a telescope at a givenmagnification where the Airy disc is a factor inthe resolution. This, then, is the basis for com-parison of telescopes of different aperture. Toestablish a scale, the Airy Disc Brilliance Factor ofa 31f2"-telescope is "1". On this same scale thebrilliance factor for a 5" is 4.2 and of an 8" itis 27.5.

004" Telescope 8" Telescope

at 1000 power at 2000 power8" Telescope

at 1000 power

Light distribution in the primary maxima or Airydisc of telescopes of different size compared atthe same and at different magnification.

Canon FTb Camera with 500101 f/ 1.8 lens. 310.00Canon FTb Camera body only with

adaptors . . 215.00Schmidt Camera-51h II Aperture, 9" focal length.

2250101, f/l.65 with one film holder. This iscomplete photographic unit which is mountedpiggyback on the side of any of the Celestrontelescopes. You can photograph most of theMessier objects in exposures ranging from 30seconds to 5 minutes. It uses 350101 film thatyou cut from standard 35mm cartridges. Imagescale is 5'12 ° x 8'12 ° on the 35mm format.Schmidt Camera users must be prepared toprocess their own film.

Celestron Schmidt Cameras,225mm,f/1.65 .. $565.003000101, f/1.5- ............•...... $710.00

Celestron Telephoto Lenses

The tube assembly only af the Celestron 5 andCelestron 8 are offered separately from the forkmount for the telephotographer who desires toobtain the finest mirror-lens telephoto availablebut does not wish the fork mount. When sold astelephotos, these instruments are supplied withthe T-Mount camera adaptor and finder scopeanly. They are provided with a tripod plate.CL5-f Il 0- Telephoto Lens 425.00CL8-fIl0-Telephoto Lens 675.00

••••-'~Closeup of the Celestron 8 ond 5Declinotion setting circle (one oneach side). Photo also shows thedeclination clomp and the screwsattaching the tube assembly to thefork.

Photo showing the Schmidt Camerafilm holder which holds the film atthe proper curve and in turn is heldin place magnetically to a rigidspider support.

Drive Corrector. To compensate for the rotation ofthe Earth so that a stellar object being viewed bythe Celestron remains centered in the field ofview, an electric clock drive is installed in the baseof the instrument. This drive is operated off 110volts - 60 Hz, 6 wafts. For operation in the fielda d-c to o-c inverter called a drive corrector isoffered. It consists of a solid state oscillator andamplifier device which operates from your autobattery. The main power unit of this inverterfastens to the pier of the telescope and hand con-trols are placed on a short extension cord whichallows you to speed up to slow down the clockdrive for photographic guiding. An outlet from thisinverter also supplies power for the lamp in theilluminated reticle eyepiece. Price $85.00

Special coatings - the reflective elements of theCelestron 5 and 8 are aluminized and a carefullycontrolled '/2 -wave overcoat of silicon mononixeis applied. This overcoat protects the delicate re-flective surface and increases the reflectance byabout 2% over regular telescope mirrors whichare simply aluminized .and flash overcoated. Forthose who desire, multilayer enhanced coatingsare available. This further increases the ref lec-lance by about 2% per each mirror. Due to thefact that there are only two surfaces through whichIig ht passes (the corrector plate) in the objectivesystem and in the interest of presenting the userwith a more rugged instrument, these surfaces arenormally not anti-reflection coated. For those whowish the maximum transmission through theirCelestron, we offer a broad-band VlR coating onthe corrector. This increases the transmission by9.5%. Users are ,cautioned never to leave a fingerprint on a coated surface, however, since the acidscontained in prints tend to etch through thecoatings.

locked- Triangle Tripod - We tested all of theheavy-duty tripods offered and found none thatwould meet our rigidity requirements. So we setout with the design problem of a tripod mountthat would hold a high power telescope steadyunder gusty wind conditions, that would fold downto a convenient portable package, and that couldsell for under $200.00. All of these objectiveswere met in the locked-Triangle tripod. As a mat-ter of fact, the stability of this tripod is so goodthat we do not hesitate recommending it for useas a platform for either the Celestron 8 or Celes-tron 5 when making deep sky guided photo-graphs. These instruments can fasten to the tripodin their altazimuth position for terrestrial viewingor for telephoto work. The tabletop wedge assem-blies supplied with the Celestron 8's and 5's afterthe introduction of this tripod are drilled for at-tachment to serve as the equitorial wedge forCelestial viewing and photography.locked-Triangle Tripod $150.00

Portable pier supports the Celestron 8 with the225mm - fl 1.65 Schmidt Camera, and a piggy-back Canon FTb. The pier is an 8-inch aluminumpipe column with an adiustable wedge (20 to500

) and rugged cast aluminum legs (totalweight 48 pounds).

Off-axis guiding eyepiece camera adaptormounted on the Celestron 8. This device allowsyou to simultaneously photograph and guidethrough the main optics of the Celestron 8. Asmall prism in this assembly picks off a star justoff the edge of the field being photographed anddiverts it into the 12112 mm illuminated reticleeyepiece.

The Celestron Tele-Extender (eyepiece projection)system consists of the visual back (a) suppliedwith each telescope, an ocular (b) also supplied,the extender tube (c), a "T" ring (d), and thecamera body. This system is most useful for close-ups of lunar craters and for planetary photog-raphy. The 25mm ocular in this system increasesthe focal length by a factor of 3, the 12112 mmincreases it by a factor of 8.

••(WiaauUI 7ll

Some of the Celestron 5 acc"S$ories, (a) - prismdiagonal. (b) - 2X Barlo" lens. (c) - counter-weight set. (d) varipo"er straight-throughimage erector. (e) - Porro-vism image erector.

Celestron 8 Solar fillers - 3·inchoff-axis and full aperture. These fil·ters consist of inconel cootin", ap-plied over one surface of an opticalwindow. They reduce the solar inten-sity ·by a factor of 1/10,000, makingit completely safe to view the sunthrough Ihe instrument. A similar fil.ler is offered with the Celestron 5.

Closeup showing the declination slow motion tan-gent screw of the Celestron 8 (similar on the 5).This is a stainless steel roll-threaded screw forthe ultimate in smoothness. The telescope moves10 are minutes in declination for each turn of thisscrew.

View inside the clock drive of the Celestron 8.Note the heavy-d uty ball bearings on the longtapered polar shaft. The bearing and drive ar-r.ongement of this telescope give it load carryingcapability for almost any accessory combination.

Please enter my order for a Celestron Schmidt-Cassegrain Tele-scope with the accessory items indicated. My address is:

Celestron (5) (8) ( )

Accessory items:

Cal ifotnia residents add 5% sales tax

Total

Enclosed is my deposit of $125 (check or money order). Pleasenotify me promptly of delivery date and approximate shipping char-ges. I understand that I may cancel this order at any time prior tothe shipping date and my deposit would be returned in full. De-livery to be made as follows - - Check one:

DD

[ will pick up the instrument at the Celestron factory andwill make the final payment at that time.

Please notify me when the instrument will 'be ready. I willsubmit the balance before the shipping date.

D Please ship the instrument by air freight. I will pay the bal-ance and shipping charges C.O.D.o [desire to finance this purchase using your factory-directfinance plan. Please send an application form.

Celestron Pacific 2430 Amsler / Torrance, California 90505

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How to Order a Celestron TelescopeTo order a Celestron Telescope simply complete the order form onthe reverse side of this sheet. Your order will be promptly acknow-Iedged, and you wi II be adv ised of the sh i ppi ng date. (Depend ingon backlog, the shipping date wi II vary from stock to six weeks -seldom longer).

A factory-direct finance plan is offered for those who wish to owna Celestron telescope. For the Celestron 5 the down payment is$200.00, and you make 12 monthly payments of $38.00 each (thisincludes the $36 interest charge and a $25 charge for shipping andhand ling. F or the Ce Ie stron 8 the down payment is $345.00, andyou make 12 monthly payments of $50.00 each (this includes the$50 interest charge). The finance plan is offered for the basicinstrument only in each case - - payment for accessory items mustbe in full at time of delivery. Should you like to take advantageof the Celestron finance plan, simply so indicate on the reverseside of this sheet, include your deposit, and a credit applicationform will promptly be mailed to you. (Finance plan not availableto anyone under 21 and Ii mi ted to res ident s of cont inenta I U.S .and Canada)

Celestron Techniques - Subscription form

Enclosed is $2.00. Pleaseenter my subscription forthe next four issuesof Celestron Techniques .

Del ivery information:

Celestron 5

Julyl,1972

As of this date we are heavily back orderedon Celestron 5's; therefore please allow 60to 90 days for delivery. We hope to be ableto deliver from stock soon thereafter.

The Celestron 8 served os the stable platform for a 35mm camera with its50mm f 12.8 taking lens for this 10-minute guided exposure of the South-ern Milky Way in Sagittarius. Section outlined was simultaneously photo-graphed by the Celestron Schmidt Camera - below.

Trifid and lagoon Nebulae (M20 and M8). Celestron 51h-inch (225mm,fl 1.65) Schmidt Camero photograph. This instrument was mounted piggy-back on the Celestron 8 for this 10-minute exposure on Tri-X. 8X enlarge-ment.

It is always a challenge to try to capture on film the enormous detail thatcan be seen visually through the Celestron 5 and Celestron 8. The largercrater in deep shadow is Copernicus and the somewhat smaller one isEratosthenes. Celestron 8 photo with Tele-Extender.

The Orion Nebula M42, the brightest nebula in the sky. It can easily beseen with the unaided eye even when the Moon is full. What appears tobe the center star in the sword of Orion is actually this softly glowingcloud of ionized hydrogen. 5-minute exposure on Tri-X at the 80-inchCassegrain focus of the Celestron 8.

Mars presents its different faces to Celestron 8 owner James Matteson ofSan Diego, California. Matteson took these unusual shots through his Celes-tron 8 on Panatomic X film using a 35mm camera body with Tele-Extender.

Jupiter with its belt structureand giant red spot is always afascinating object for both visualand photographic work with theCelestron 8. John Sanford ofCosta Mesa, Calif. took thisJupiter shot with his Celestron 8on Tri-X film.

Taking pictures of pretty girls takes on a new dimension when you areshooting through the Celestron 5. Try a freckle or the twinkle in an eyeor maybe the simple beauty of a pearl earring from 30 feet away.

Celestron ObservatorY-. TelescoRes

The Celestron 22 Multipurpose Telescope for the Univer-sity or Science Center installation. The 22·inch aperturecauses faint stellar objects to appear over 4000 timesbrighter than to the unaided eye and the instrument maybe used at 75 to 2000 diameter magnification. This telescopehas an effective focal length of 18 feet, yet the foldedoptical system permits an installation in a lo-foot dome.Priced at $20,000 to $32,000 depending on accessories.

The Celestron 14 com bines the prestigious per-formance of a giant-aperture observatory telescopewith ready portability. This instrument has a cleardiameter of 14 inches, a light grasp of 1,760 timesthat of the unaided eye and a useful magnificationrange of up to 850X. It also has a resolving power of0.28 arc seconds, electrical slow-motions in both axesand enhanced high-transmission optics. So it is ideallysuited for deep-space observations, astrophotographyor research assignments, and it can be installed withpride in a permanent dome. Yet this observatoryshowpiece is portable. First, the Schmidt-Cassegrainoptics that give razor-sharp, flattest-field images alsofold a l3-foot focal length inside a stubby,2Y2-foot-long tube. Second, we designed the Celestron14 so that in minutes one person can disassemble itfrom its pier (optional), and carry it to a remotedark-sky site in two cases. And there the instrumentcan be used on a sturdy tripod with equatorial wedge(also optional), giving jitterfree image stability in thefield. But the Celestron 14 offers more than theportability of optically smaller instruments; it alsooffers the light transmission of optically larger ones.Its optical elements, including a giant diagonal, haveenhanced aluminum/silver coatings which transmit asmuch light to the focal plane as a conventionallycoated 16-inch Cassegrain. And with optionalcoatings, the Celestron 14 becomes transmission-equivalent to a l7Y2-inch Cassegrain. Such featuresmake this optical station ideally suited for high-contrast lunar, solar or planetary observations; forguided exposures of faint nebulae, star clusters ordistant galaxies; and for photometry, spectroscopy orpatrolling. And coupled with astrophotographicaccessories such as the Celestron 300mm-f/l.5Schmidt Camera, an 8-inch guide scope or apiggyback 35mm SLR camera, the Celestron 14readily becomes an astrophotographic laboratory.The base price of the instrument ... $3600, wellwithin the budgetary reach of small sciencedepartments, research facilities or individualamateurs.

The Celestron 16 is the opti-mum primary instrumentfor the college or schooldistrict ol>scrvntory. It fea-tures the compollnclSchmidt-Cassegrain opticalsystem which allows the 15-foot focal length of the lenssystem to be pHckngcd in ntube which i.s only 32inches long. The massivefork and electric. drive as-sure excellent image sta-bility and ease of operalion.The Cclcstron 16 causesstellar objects to appear2000 times brighter than tothe unaided eye, and it can

be used at up to 1500 diameter magnification. Many op-tional accessories are available to expand the Celcstron 16teaching potential. The price $1-3.000delivered.

T hose interested in the larger Celestron telescopes - send for specific data sheets andlocation of the nearest public observatory where one of these instruments is installed.

Celestron Pacific Phone L.A. (213) 534-2322N.Y. (212) 834-1888Chi. (312) 898-3353