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Understanding Camera Flash

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68
Message posted at 06/27/2013, 17:48:21 PM by Robinstockphotos
New article posted: Understanding Camera Flash
Canon EOS 600D and Canon SX30 IS with 50mm, f/1.8 lens, 18-5...

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Rosariomanzo
519 posts
56
Message posted at 06/28/2013, 00:59:34 AM by Rosariomanzo
Useful, thanks for sharing
A DSLR and a mirrorless camera, a bunch of lenses, a flash.

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Unteroffizier
276 posts
Message posted at 06/28/2013, 03:55:05 AM by Unteroffizier
6. I used bounce flash and my image is underexposed.
The camera calculates exposure based on what it sees through the lens. The camera assumes the flash light would fall directly on the subject. But the actual light that falls is lower in intensity because of scattering and absorption by the bouncing surface. So just increase flash power by making flash EV +1 or +2/3, whatever gets you a proper exposure.


That calculation works when you tilt the flash speed light head direct at the subject or scene. When you tilt the head at an angle e.g 45 degrees or 90 degrees the flash will automatically increase the flash intensity internally. Still at times the scene will not be properly exposed - not because of insufficient flash compensation but rather the nature of the location - whether it has low or high ceilings, color of the walls, or a dimly lit open space with the skies and heaven to bounce your flash back to earth.
Entry level digital SLR cameras and lenses.

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68
Message posted at 06/28/2013, 04:58:04 AM by Robinstockphotos
While most flashes calculate exposure for bounce flash correctly, some third party flashes aren't able to. Especially when used off camera with complex lighting setups
Canon EOS 600D and Canon SX30 IS with 50mm, f/1.8 lens, 18-5...

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Mike2focus
435 posts
74
Message posted at 06/28/2013, 08:40:27 AM by Mike2focus
Good stuff. Thanks for writing!
Nikon, Adobe and Macintosh

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Suyerry
565 posts
68
Message posted at 06/28/2013, 10:03:36 AM by Suyerry
Very useful, thanks for posting!
Nikon Equipment, Nikon Lenses, Professional Photo Software

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FabioConcetta
3552 posts
84
Message posted at 06/28/2013, 15:06:03 PM by FabioConcetta
Thanks for sharing, congratulations great blog!!!
Nikon D700 --- nikkor 24-70 F 2.8 --- micro nikkor 105 VR...

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Psmpics
79 posts
<10
Message posted at 06/28/2013, 20:07:58 PM by Psmpics
Great primer on using onboard pop-up flashes. Lots of great information.

P.S. I especially like your coining of the acronym "FWP" (Frequently Wondered Points)! FAQs just don't cut it anymore :).
Bodies: Nikon D7000 and Nikon D80. Lenses: Nikkor AF-S 70-30...

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Serjedi
60 posts
68
Message posted at 06/29/2013, 00:03:50 AM by Serjedi
Very useful, thanks for sharing
Canon EOS 6D + Canon EF 17-40mm f/4 L IS USM + Canon EF 100m...

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Lenutaidi
3209 posts
71
Message posted at 06/29/2013, 02:00:31 AM by Lenutaidi
Yes,thanks for sharing,Robin!


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Unteroffizier
276 posts
Message posted at 06/30/2013, 02:41:15 AM by Unteroffizier
Point #1: I will probably use a pop up flash behind a pop up flash diffuser at minus minimum EV setting to trigger a remote speed light flash unit since I do not have a wireless trigger : )
Entry level digital SLR cameras and lenses.

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68
Message posted at 06/30/2013, 07:15:58 AM by Robinstockphotos
Unteroffizer, That would still have the effects of fill-in flash plus the additional flash because the external flash operates off the pre-flash.
So you could just enable pre-flash and disable the rest to use it as remote control. That would make sure there is very very little effect of on-camera flash on your photo. :)
Using a diffuser on pop-up flash is already troublesome because you're losing intensity. Wouldn't work in daytime. And if you increase flash power, on-camera flash would make images flat. Double trouble. So just keep flash power highest and enable only the pre-flash. Solves the double trouble without a single trouble.
Canon EOS 600D and Canon SX30 IS with 50mm, f/1.8 lens, 18-5...

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Chanevy
579 posts
71
Message posted at 06/30/2013, 11:03:17 AM by Chanevy
Very useful info!
Canon 7D Nikon Coolpix P510 Samsung Galaxy S3 Canon L70-2...

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Egomezta
4791 posts
81
Message posted at 07/02/2013, 10:35:24 AM by Egomezta
Amazing blog, thanks for sharing.
Cameras: - Nikon D600 and D90 - Samsung Digimax Pro 815...

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Hamik
23 posts
60
Message posted at 07/04/2013, 02:19:05 AM by Hamik
Useful. Thanks ;)
Nikon D7100, Tamron 17-55 f2.8, Sigma APO EX DG 70-200 f2.8 ...

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