Pinhole cameraobscura

Download Pinhole cameraobscura

Post on 21-Jan-2015

889 views

Category:

Documents

0 download

Embed Size (px)

DESCRIPTION

 

TRANSCRIPT

<ul><li> 1. What very well might just be the Fastest Pinhole Camera Obscura Project Ever Astound and bewilder your friends!</li></ul> <p> 2. </p> <ul><li>An apologetic but fortunately brief note about readability: </li></ul> <ul><li>We are so very sorry if this appears too small.To see this in full-screen mode: </li></ul> <ul><li>Click view in Slideshare-type button </li></ul> <ul><li>Click the full button </li></ul> <p> 3. Pinhole Camera Obscura? Why, yes! Some smart person figured out that a simple pinhole will let you see a sharp (but inverted) scene on a transparent window or on the inside wall of a dark room. Sure, its really dim, but everythings in focus! 4. Amazing!How can that be? The pinhole is so small that each little piece of the viewing window receives light from just one part of the scene: 5. What Youll Need 6. What Youll Need Fancy Tea Tin from B&amp;N Cafe Tissues Black Paper 7. What You Need Scissors Rubber Band Aluminum Foil Pins Pokey Thing Sharp Knife White Paper (not shown) 8. Let the Craziness Begin! </p> <ul><li>Cut a small (1 cm x 1 cm) square of metal out of the bottom of the tea tin </li></ul> <ul><li>(Be careful) </li></ul> <p> 9. Make the Pinhole </p> <ul><li>Tape some flat, taut aluminum foil over the hole </li></ul> <ul><li>Poke a tiny hole in it. </li></ul> <ul><li>Makemagazine says between 0.2 and 0.5 mm works well. </li></ul> <ul><li>I know its tricky, but try to prevent excess material jutting out from either face of the foil.Thatll mess up the image. </li></ul> <p>Astounding Pinhole 10. Inside of the Box Thus Far 11. Add the Viewing Window </p> <ul><li>Flatten a tissue and... </li></ul> <ul><li>Secure it to the top of the tea tin using a rubber band </li></ul> <p> 12. Try that Bad Boy Out Hold it up to some lights but not the sun! Or, turn out the lights and hold it near a candle flame. 13. But wait! Thats not all! Bonus Two-in-One Pinhole Camera Obscura 14. For a Brighter Image: Baffles! </p> <ul><li>Remove that stupid tissue </li></ul> <ul><li>Fold the black paper so that it lines three inner walls </li></ul> <ul><li>Cover the fourth wall with white paper </li></ul> <ul><li>View scenes at an angle - but itll be easier to see. </li></ul> <ul><li>(Ok, its still dim, but you should see lamp filaments.) </li></ul> <p> 15. For a Brighter Image: Baffles! </p> <ul><li>Remove that stupid tissue </li></ul> <ul><li>Fold the black paper so that it lines three inner walls </li></ul> <ul><li>Cover the fourth wall with white paper </li></ul> <ul><li>View scenes at an angle - but itll be easier to see. </li></ul> <ul><li>(Ok, its still dim, but you should see lamp filaments.) </li></ul> <p>Angle it down so the light hits the bottom inner wall: 16. Parting Thoughts </p> <ul><li>Still too dim?Yeah, I know.But it got you thinking about optics. </li></ul> <ul><li>Try viewing the sun (indirectly).Its image will be small, but an eclipse should look like a crescent. </li></ul> <ul><li>Bigger images: use a longer tube </li></ul> <ul><li>Want to make an actual camera, with film?See: Ross Orr, Pinhole Panoramic Camera,Makevol. 09, pp. 92-103. </li></ul> <ul><li>Want to learn something about optics? Try: </li></ul> <ul><li><ul><li>Donald OShea,Elements of Modern Optical Design </li></ul></li></ul> <ul><li><ul><li>Hecht et al,Optics </li></ul></li></ul> <ul><li>Wish you had those 15 minutes back?I dunno, try making some of that tea. </li></ul> <p> 17. Thank you. Gregg Favalora an engineer near Boston who worked for many years on 3-D television and is now employed at Optics for Hire www.greggandjenny.com/gregg </p>