Paul C. Buff, Inc. Technical Forum

Dear Sir,
I have three CST Trigger Transmitter, two types 2.5mm<--> PC sync cable (one is 1 meter long and the other 30cm, https://dl.dropbox.com/u/26109102/2012-09-16%2023.41.52.jpg ), Nikon D300, D700 and D800, lots of SB-900 and SB-800 flashes.

If connect one of my SB-900 flashes to camera hotshoe directly. Than when I connect CST transmitter to camera's PC connector, there is no problem at all in burst mode. However using camera's pc connector, unfortunately doesn't suit to my finger or my holding possition. So I try to use main flash's PC connector.
When I use one of my cameras in burst mode with SB-900 and connect CST transmiter to main flash, main flash (TTL mode) fires in first picture and than no fire rest of couple of image. Its not about flash power. I try flash power of 1/128 and still having same issue. I set my camera to CL mode and try different fps speed. It seems I can only get main flash fire to each picture when I set it to 2 fps.

I do same test with SB-800 flashes and I can get succesfully 3 fps this time.
I try two different cable with no luck. I get Pixel TF-322 adapter ( http://cdn101.iofferphoto.com/img3/item/487/307/624/l_tf-322-nikon-i-ttl-flash-hot-shoe-to-pc-sync-adapter-65a1.jpg )and use its pc connector but still can not get main flash to second pictures in burst mode.

It seems when I use different PC connector rather than camera's, some how CST transmitter interference to main flash in burst mode.

What do you think? If you want, I can record video about my problem.
Thanks.

Have you tried this with the TTL mode off?

Yes I try with M 1/128 power aswell and still second flash doesn't fire in burst mode when I connect CST to manin flash PC sync connector or Pixel TF-322 connector.
Could you try on yout tast setup to see whats happening on your side?

Unfortunately we do not have speedlights in house at this time.