Mark, do you get any keepers at 800mm? And what do you suspect to be the culprit? Tripod/head combination in use?
Mark Cassino wrote, in part:
- at my present skill level I can consistently get sharp results with 680mm - at 800mm my results drop off dramatically. So I figure I should be able to get the same results in a DSLR at an effective 1020mm (680 x 1.5).
