Jul 21, 2008 13:27 | #1 I posted this problem I was having this past Saturday with my 40D. It was the first time I tried the new Alien Bees transmitter and battery-powered receivers. People attributed it to a failing shutter, but then I went out yesterday for a photoshoot (without the AB transmitter mounted), and the camera worked flawlessly. Could it be something with a the transmitter making the shutter act up as a result of an incorrect sync time??? 5D Mark III | 135L | 24-70L | 580EXII | Flickr | Instagram
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shooterman village idiot, actually a genius!  More info | Jul 21, 2008 13:50 | #2 The EXIF says you shot at 1/500. I believe 1/250 is the max sync speed for the 40D. Set it at 1/250 or slightly less and you'll be golden. Randy
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ueb0258 Senior Member 498 posts Likes: 2 Joined Jun 2005 Location: Nashvegas More info | Jul 21, 2008 13:54 | #3 I checked out the exif data on the picture you posted and the shutter speed says 1/500th. This is too fast for that camera. Its to sync speed for flash is 1/250. You have that doubled. That is why you have the black bar half way up the picture. I would say check the exif data on all your pictures that have the black bars and see what your shutter speed is.
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Jul 21, 2008 13:57 | #4 ueb0258 wrote in post #5954895  I checked out the exif data on the picture you posted and the shutter speed says 1/500th. This is too fast for that camera. Its to sync speed for flash is 1/250. You have that doubled. That is why you have the black bar half way up the picture. I would say check the exif data on all your pictures that have the black bars and see what your shutter speed is. I also read in your other post that your camera showed a 00 for the Aperature. I have had this happed once or twice on my 20D. It came from a comm problem between the body and the lense. I had to have the kit lense repaired from my 300D due to it doing that was well. Thanks, I'll definitely double-check on the EXIFs. As for the 00 problem... that was a few months old $900 17-55 f2.8 IS... 5D Mark III | 135L | 24-70L | 580EXII | Flickr | Instagram
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therealmr Senior Member 519 posts Likes: 1 Joined Feb 2008 More info | Jul 21, 2008 14:05 | #5 Clean the connectors on the lens - it's solved that problem for me before. http://www.simkinsphotography.com/
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MattMoore Goldmember  1,839 posts Likes: 4 Joined Jan 2007 Location: San Antonio, TX - USA More info | Jul 21, 2008 18:03 | #6 1/320 was the fastest I could sync on my 30d with the AB Cybersyncs without issue.
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bobbyz Cream of the Crop 20,506 posts Likes: 3479 Joined Nov 2007 Location: Bay Area, CA More info | Jul 21, 2008 18:06 | #7 Yup, use 1/250 or under to be safe. I could sync at 1/320 with my cybersyncs.  Fuji XT-1, 18-55mm
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