SB800 batteries are Enloop AA's. The subject is an orchid blooming. I'm using a Nikon micro 60mm @ f22 (even there,DOF is about 1"). I'm taking shots 1/min, but the camera battery is running out at about 2-1/2 hours, (another problem?)The flash fires 2 or 3 times then quits. The ready light on the flash.
P.S. I may have already found my solution. The flash batteries seem to have lost their charge in the last few days! Definitely not like Enloops . I'll try now with other batteries.