I am using a D800 and dual or triple opticaly triggered YS-D1 strobes. I have been using this set-up successfully using manual strobe seting. I thought I would play with TTL settings and I noticed that when using TTL, for macro, a strip on the bottom of the image, comprising about 10% of the total image appears to have no flash. When setting the strobes to TTL I did remember to switch both my camera on-board flash and the strobes to the TTL setting, and batteries are fully charged. When I switch both back to manual, the issue resolves. Also, if I leave my on-board camera flash on TTL, and set the strobes to manual with a pre-flash, there is no issue. I tried slowing my shutter speed from 1/200 to 1/160, but the bottom is still underexposed. I usually don't use TTL , but am still surious what could be causing this issue.
Edited by diverdoug1, 03 February 2014 - 08:56 AM.