Problem with camera or flash?

I am having a very strange problem when I use my remote transmitter with my 430ex and Canon 40D. Some of my shots are coming out black even though the flash is firing. When the flash is physically attached to the camera, no more black super underexposed frames. Here are some examples. It will work for a little while then I'll get a shot with the shutter in the way. The next shot is usually totally black. Then it will eventually correct itself (at least it seems to - I have not tested this exhaustively). Any ideas? I am WAY under the sync speed as far as my SS is concerned. Camera is in full manual mode. Attached photos were shot at 1/200, iso 400, f/4.6. I even shot the last couple at 1/125. I have moved my focus button to the back. Is my camera broken or is it a setting I've messed with? Troubleshooting help is appreciated!!

Thanks!

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What lens are you using?

Most of the off camera flash triggers need slow shutter speeds. The dark part is because the shutter is closing. Which triggers are you using?

dan

JRB wrote in post #7193549
What lens are you using?

Canon 50mm f/1.8

dan j wrote in post #7193677
Most of the off camera flash triggers need slow shutter speeds. The dark part is because the shutter is closing. Which triggers are you using?

dan

Bought from Ebay - see the link:

http://cgi.ebay.com …EWNX:IT&item=36​0091087097

Should I try to keep the shutter speed below 200?

That's what most of the folks here say to do.

dan

Go down to 1/80 and work up. It's doubtful they will sync at max sync speed.

Titus213 wrote in post #7194125
Go down to 1/80 and work up. It's doubtful they will sync at max sync speed.

So the solution is to buy a better wireless setup? Without breaking the bank, what are some recommendations?

Cybersyncs...nuff said.

zelseman wrote in post #7194479
Cybersyncs...nuff said.

Perfect - thanks!! Yet another thing on the list to buy.

Another vote for CyberSyncs here.

Here's a thread with some photos similar to yours: https://photography-on-the.net/forum/showthre​ad.php?t=633971 in post #17. I use CyberSyncs at 1/320th which is faster than the flash-sync of on-camera flash. I showed a 1/400th picture with the shutter darkening the bottom of the frame.

I use Cybersyncs but I generally shoot around 1/125 too.

James33 wrote in post #7193524
I am having a very strange problem when I use my remote transmitter with my 430ex and Canon 40D. Some of my shots are coming out black even though the flash is firing. When the flash is physically attached to the camera, no more black super underexposed frames. Here are some examples. It will work for a little while then I'll get a shot with the shutter in the way. The next shot is usually totally black. Then it will eventually correct itself (at least it seems to - I have not tested this exhaustively). Any ideas? I am WAY under the sync speed as far as my SS is concerned. Camera is in full manual mode. Attached photos were shot at 1/200, iso 400, f/4.6. I even shot the last couple at 1/125. I have moved my focus button to the back. Is my camera broken or is it a setting I've messed with? Troubleshooting help is appreciated!!

Thanks!

Read this very carefully.

http://en.wikipedia.or​g/wiki/Focal_plane_shu​tter

Enjoy! Lon

Good stuff - thanks all!!!