11/23/2015on camera flash1 basic photography using flash
Embed Size (px)
04/21/23 On Camera Flash 1
Basic Photography Using Flash
04/21/23 On Camera Flash 2
Basic Photography Concepts
• Automatic vs. Creative Modes
• EV Equivalent Value
• Lighting considerations
• Add Flash to you shot
• Guides as starting points
04/21/23 On Camera Flash 3
Automatic vs. Manual
• Automatic is easy
• Quality is good • I’m in a hurry
• Manual is difficult
• To many things do I need to think about.• What are the advantages?
• The difference is consistency and control.
04/21/23 On Camera Flash 4
Automatic vs. Creative Modes
• To what extend do you want to have control?
• Creative modes– AV , TV, P– Manual
• Custom Features– First curtain vs. second curtain– High speed sync
04/21/23 On Camera Flash 5
Histogram in Camera
• To the left the picture is to dark, to the right it’s too bright
• Balanced is in the center• A valuable tool in camera
To dark To bright
04/21/23 On Camera Flash 6
• Three choices, all with limitations– Aperture 22, 16, 11, 8, 5.6, 4, 2.8, 2, 1.4,1.2
– Shutter Speed100, 200,400,800.…8000
– ISO- 100, 200, 400, 800,1600…. 24,000
04/21/23 On Camera Flash 7
Lighting Considerations• What is your main light source?
• Direction of the light• Color Temperature
• What affect do you want?• Digital camera metering to 18% gray
• Increase exposure for white• Decrease exposure for black
• Do I want, or need flash?
04/21/23 On Camera Flash 8
Using On-camera Flash
• Built in flash unit• Add on flash units
– A or B type units– EX vs. EV units– Metering with TTL– Consider using EV changes on flash unit
• Camera Sync Speed• Considering a purchase?• Off camera flash – subject for another time
04/21/23 On Camera Flash 9
Light Fall-Off(Inverse Square Law)
Illuminated area = 1 sq ft
Illuminated area = 4 sq ft
For a given light source intensity:- Twice the distance results in 1/4th illumination (i.e., 2 stops lower)- Three times distance results in 1/9th illumination (i.e., >3 stops lower)- Four times distance results in 1/16th illumination (i.e., 4 stops lower)
Solutions:- Decrease distance between closest & furthest subjects- Back away from closest subject as much as possible- Use Large Diffuser (limited effectiveness when on-camera)- Use Bounce Flash (back wall, side wall, ceiling, reflector)
04/21/23 On Camera Flash 10
Flash Unit Guide Number
Guide Number shows the power of the flash unit.
Useful tool to estimate exposure when distance is known:
Guide Number / distance in feet= Aperture580 EXII 7D
(mm) 14 15Guide No 49 39
f / (ft) (ft)2.8 18 14
4 12 105.6 9 7
8 6 511 4 4
04/21/23 On Camera Flash 11
Add Flash to Composition
• As your primary light – Soft vs. hard light (demo flash)– Direct vs. indirect light (demo)– Light fall off (demo)– Ambient light (Demo)– Color Temperature (demo)
• Used a supplemental fill light – Control shadows, Highlight subject, Create soft light, Contrast
• Light fall off– Flash on subject is not affected EV, background is (Demo)– Adjust EV as subjects appear further away (Demo bounce flash) – Guide Number / distance in feet = Aperture
04/21/23 On Camera Flash 12
Direct vs. Indirect light
• Direct light removes shadows and creates a flat picture.
• Direct light is a hard light• Bounced flash softens light and skin tones
04/21/23 On Camera Flash 13
Soft vs. Hard Light
• Look at the skin tones between a soft and hard light.
• Notice reflection of light from flash
04/21/23 On Camera Flash 14
Light Fall Off
• Example shows how illumination is less the further apart the subjects are from the source.
04/21/23 On Camera Flash 15
Solution for Light Fall Off
• Consider bouncing flash to balance illumination on subjects at different distances.
04/21/23 On Camera Flash 16
• In addition to your main light, you need to consider ambient light.– Tungsten add an orange color – Fluorescent – blue of green tint added
04/21/23 On Camera Flash 17
Watch out for glasses!
• Direct light reflects off glasses. • Also, “Red Eye” comes from reflection off of
the eye retina.
04/21/23 On Camera Flash 18
Color Temperature Solution
• Convert your flash to correct ambient light
04/21/23 On Camera Flash 19
Light Fall Off
• Using Flash the light remains constant– Flash on subject is not affected by change in EV– Background illumination can be controlled with
04/21/23 On Camera Flash 20
Notice the back ground!
• By just changing the shutter speed you control the color and texture of the back ground.
04/21/23 On Camera Flash 21
Want more Shadow?
• Add flash and to the extreme. • Adjust the angle and distance of the flash to
04/21/23 On Camera Flash 22
• Grey scale demo showing manual vs auto exposure modes.
• Color demo showing manual vs auto color selection
• Additional examples
04/21/23 On Camera Flash 23
Starting PointsConsiderations/Rules of Thumb
• Read your equipment manual!• Daylight- Rule 16: A 16, SS 100, ISO 100• Flash on subject in Sun light
– Sun behind camera -3EV to -1EV– Sun at 90 degrees -2EV to 0EV– Sun behind subject -1EV to +1EV
• Indoor consider your color temperature• Consider bounce flash to direct or soften light• Consider shutter speed & ISO to supplement background• Shoot Raw to have 16 bits of data per pixel to work with for flexibility• Look at the camera’s RGB histogram • Shoot a manual practice shot, then adjust the settings to your
preference• Play with flash - practice