i had the Sigma 800/5.6 HSM (no the DG version though) and sold it for a new Nikkor 600/4 AF-S II. with the 1.4X AF-S TC, the 600 is slightly sharper. the newer Sigma 800/5.6 is optically identical except for coatings. i don\'t expect that to affect sharpness. also, the Nikkor even with the TC is faster focusing than the Sigma. the 300-800 gives lots of flexibility but you pay for it in some loss of sharpness and contrast and even slower AF. i shot BIF with the Sigma 800 and i regularly do it with the 600 with the 1.7X. the Sigma doesn\'t take well to using any TC while the 600/4 with 1.7X has longer reach, about as fast AF, and is about a sharp. unless Nikon designs an 800/4, i don\'t see the point of an 800/5.6.
Herb...
coracii wrote:
Forgot about the Sigma 800 prime... Old age setting in again. I\'ve had the chance to briefly use a 600 f/4 with the TC attached to a friends\' D3, but never either of the Sigma\'s. Unfortunately he lives 1400 miles away, so it\'s a limited opportunity. I\'d shoot the Nikon combination without hesitation to get to 800mm, if I could afford it without selling my house and/or a kidney.
Apr 09, 2009 at 10:13 AM
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