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Fill-Flash , getting it right manually---- Help Please !!!!
I want to use my Canon 420ez flash gun manually for fill flash with a manual TLR camera. The gun allows 1/1, 1/2, 1/4, 1/8, 1/16, 1/32 control in power output. As yet I havent tested these setting on a film, so don't know how each setting behaves. Does each fraction correspond with an F-stop or do I need to use a table of some kind to get correct fill ratios? or is it a case of trial and error.If anyone has one of these guns and can be of assistance it would be appreciated. Ta
Yes, each fraction is the equivalent of one aperture setting. So setting the gun to 1/2 will give one aperture less light han needed which is good for fillin in bright sunlight while 1/4 is better for use in slightly overcast conditions to brighten the image and give subtle flash coverage.
It depends on the ambient light though, if it is really sunny then 1/2 power may be required but generally I would start at more like 1/8th. In most cases 1/2 power will fry an image.
Also your aperture has an effect, if you are shooting at f 2.8 or f4 then you need a much, much weaker flash to achieve the same effect that you would at f8 or f 11 (shutter speed isn't a factor in flash exposure until you start getting above the sync speed).
Say you were shooting on an averagely bright winters day outdoors with a bit of cloud and an aperture of f4 - 5.6 then I'd start at 1/8th
power, maybe bracket it with 1/4 and 1/16th too if you're unsure.
Also your aperture has an effect, if you are shooting at f 2.8 or f4 then you need a much, much weaker flash to achieve the same effect that you would at f8 or f 11 (shutter speed isn't a factor in flash exposure until you start getting above the sync speed).
Say you were shooting on an averagely bright winters day outdoors with a bit of cloud and an aperture of f4 - 5.6 then I'd start at 1/8th
power, maybe bracket it with 1/4 and 1/16th too if you're unsure.
