I wonder if this will be faster at 200mm than expected.
Many have said it will be f/5.6 at 200mm since the 75-300 IS and 70-300 IS are, which would be unfortunate and make it tough to trade in a 70-200 f/4 IS for, but look at this:
75-300 IS filter size 58mm
70-300 IS filter size 58mm
70-200 f/4 IS filter size 67mm
300 f/4 IS filter size 77mm
70-300L filter size 67mm
so i\'d think it would be f/5 at worst and maybe f/4.5 at 200mm is not too much to hope for (i suppose one could go crazy and hope for f/4 at 200mm since the 70-200 f/4 has a 67mm filter but probably it won\'t work out like that)
they had to have made it a stumpy compared to the 70-300 IS for a reason, part of it might have been to improve IQ but hopefully part of it was to allow for say f/4.5 at 200mm vs. f/5.6
Aug 28, 2010 at 02:52 PM
Previous versions of skibum5's message #8794973 « the new 70-300L MTFs vs: »
(i suppose one could go crazy and hope for f/4 at 200mm since the 70-200 f/4 has a 67mm filter but probably it won\'t work out like that)