Read through several posts but didn't see the question I am look ing to resolve.
- Is there a reason to set the Flash Synch Speed to LESS THAN 1/250? I understand that FSS is the fastest the camera can use unless you go to FP mode but is there any reason to set it lower than 1/250 and just leave it there?
Nikonians is the Smithsonian of Nikon knowledge. If there is a question they can't answer, I want to see the question.
The only reason I know of is that at the far end of the shutter-speed settings (past the BULB setting) is an x-sync setting. When selecting SS, you can choose that to automatically set the shutter to sync speed, and that value is controlled by the menu setting. Of course, you can also just set the shutter speed to the value you want, so how useful this feature is I'm not sure. I use it sometimes because if I accidentally bump the SS dial and change the SS, I'll know it immediately.
The shutter speed determines what the ambient background exposure will be. Indoors, for example, if you want a very dark or black background, set the shutter speed to the max. If you want the background to be visible, set a slower shutter speed.
I'm speculating, but I suspect that this feature is provided so that you can, effectively, set an upper limit on shutter speed so if you're using strobes with slower t.1 or t.5 times and need to make sure that the front and rear shutter curtains are simultaneously open long enough for the flash to discharge most of it's pulse (t.1 time).