Here is the deal. I have a nikon d90 that i have become very comfortable shooting in manual mode so I am not an entire newbie. I got a pretty good grasp on exposure and iso an etc. Now the thing is that i never use the flash. I recently got 2 square perfect strobes and light boxes for some indoor shooting. I have a wireless transmitter and the strobes trigger just fine. What i am having trouble understanding is why i am limited to certain shutter speeds. If i try to shot faster than 1/200 the lower part of the photo is black. Now I Know my way around my menu and manual for the camera, but the ttl mode and commander mode is really losing me. So how would you shot someone who is jumping in the air and you cant shot 1/500 or faster? Thanks for any input.