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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 01 Mar 2007 (Thursday) 23:11
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ring flash question

 
marksonthestreet
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Mar 01, 2007 23:11 |  #1

I just received my ringflash and was testing it out, mind you I've never shot with any kind of flash and here's my query, why does this happen at some shutter and aperture settings.
http://i114.photobucke​t.com …/marksonthestre​et/wtf.jpg (external link)


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Wilt
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Mar 01, 2007 23:22 |  #2

If you specified what shutter speed you were using, we'd have a better clue. Without it, it is a guess. Perhaps too high a shutter speed, which means that a slit forms the opening of the shutter that moves across the sensor. The brief flash goes off while the slit is open over part of the sensor, but is already extinguishes before the other part of the sensor is exposed. OTOH the transition is normally more hard edged that the blurry edge of the example!


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awad
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Mar 01, 2007 23:23 |  #3

your shutter speed is faster than the sync speed of your camera. (usually 1/200 or 1/250th).


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marksonthestreet
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Mar 01, 2007 23:31 |  #4

ok, yeah that makes sense, I'm self taught with everything so that makes sense, i was at a 1.4 aperture <-dumb and shutter was like 1200+ so yeah that makes sense, after i went to f/22 at 250 it went away, thanks guys...but now what will i learn in my photo classes next fall


Shut up and be happy that you shoot people for a living.
GEAR: Rebel xt with bat grip/EOS-1n with booster grip/F.E.D. 4/lomo LC-A/Bronica SQ-AM/Holga, Epson Perfection 4490, alienbees ring flash, 2 britek 600s and a 200, vagabond portable battery. Bogen sticks and head, 50mm1.4, kit lens, and a 70-210.

  
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matt1987
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Mar 03, 2007 14:32 |  #5

you could try to have the flash release on the 2nd curtain..


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ring flash question
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