Hi Bart!

Thanks for this article. I'd love to be able to put this info to use, but I can't even get a shot off with my Nikon d5100. It always says "Subject is too dark" and I can't get a shot off in any mode. I tried on Bulb and 30 sec. Manual. But the M setting doesn't allow for the flash to be turned off. What am I missing here?

Frustrated, but grateful for any help.

Thanks!
Robert