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Author Topic: Fill in flash with 20d  (Read 4961 times)

willie45

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Fill in flash with 20d
« on: August 09, 2006, 07:05:16 PM »

Hi

Could anyone tell me please if it is possible to use fill in flash with the 20d. the manual doesn't really seem to cover this in any detail and I have never tried it before. Is it a case of the camera determining the degree of flash and automatically deciding that it is fill in which is required ( depending on one of the automatic program type modes being operable) or is there more to it than this? Is it maybe even the case that I would need to buy a separate flash unit for the camera to use fill in?

Thanks for your patience with an inexperienced contributor.


Willie
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gochugogi

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Fill in flash with 20d
« Reply #1 on: August 11, 2006, 07:00:31 AM »

All EOS cameras have auto fill flash algorithms built in. If you use your flash in any mode in bright light it will automatically reduce flash output for a natural look. P mode defaults to main light in dim light (below EV 10) whereas Av, Tv and M (if you follow the meter!) always expose for the ambient and use fill-in flash.

It's also possible to defeat auto fill flash reduction via CF 14.1 and dial in your own reduction (you don't want to dial on top of auto fill flash reduction as its hard to predict what the camera will do).

So basically you can point 'n shoot 'n get great fill flash or set CF 14.1 and roll your own.

You might want to study these "EOS Flash Bibles" for details:

http://photonotes.org/articles/eos-flash/

http://web.canon.jp/Imaging/flashwork/index.html
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Jonathan Wienke

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Fill in flash with 20d
« Reply #2 on: August 11, 2006, 07:17:15 AM »

I recomment turning off auto fill flash reduction and controlling flash exposure via straight Flash Exposure Compensation. When mixing flash and ambient, I usually shoot in manual or Av mode, and adjust the shutter speed (via Exposure Compensation when in Av mode) to control ambient light, and FEC to adjust flash fill. In Av mode, try starting with +1/3 EC and -1 FEC, and adjust from there to get the look you want.

willie45

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Fill in flash with 20d
« Reply #3 on: August 11, 2006, 06:41:02 PM »

Hi Guys

Thanks very much for your informative answers. I will probably start by letting the camera show me for a while before I start to control it myself. The guidance for using manual seems quite straightforward though and I will give it a go pretty soon.

 Your comments have been very helpful.

Willie
« Last Edit: August 11, 2006, 07:01:50 PM by willie45 »
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Slough

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Fill in flash with 20d
« Reply #4 on: August 12, 2006, 03:02:40 PM »

Is it really that difficult? On a Nikon camera you push a button near the flash and turn a dial to select the flash level relative to the ambient e.g. -2 stops.
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gochugogi

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Fill in flash with 20d
« Reply #5 on: August 13, 2006, 04:46:49 AM »

Quote
Is it really that difficult? On a Nikon camera you push a button near the flash and turn a dial to select the flash level relative to the ambient e.g. -2 stops.
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And it's even easier on a Canon: merely turn the QCD (big dial on the back). There's a ruler-like scale in the VF and LCD.
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willie45

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Fill in flash with 20d
« Reply #6 on: August 13, 2006, 07:17:13 AM »

I suppose like everything else, its easy when you know how. Now I have checked it out it does seem very simple indeed. However as a newcomer to this I didn't find the manual very helpful and wanted to check with more experienced photographers.

Thanks again

Willie
« Last Edit: August 13, 2006, 07:17:48 AM by willie45 »
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Ben Rubinstein

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Fill in flash with 20d
« Reply #7 on: August 13, 2006, 12:01:46 PM »

With CF14/1 I use a -2 for overcast, -1 1/3 for bright overcast and full sun can need 0 or even +1/3

willie45

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Fill in flash with 20d
« Reply #8 on: August 14, 2006, 06:49:12 PM »

More useful tips. Thanks again

Willie
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