Originally posted by BarneyL
I'm familiar with in depth reviews from ephotozine (both of them) and made by folks here, but I'm not really concerned about MTFs and levels of CA; I'm mostly interested in quality of sealing (there's a lot of rain in Iceland during spring) and general reliability over long term use in far from ideal weather conditions. Plus accuracy and speed of AF (I'm not a birder, but I don't shoot only static subjects). I had DC motor in crop sensor 16-85 and had no complaints, but I dunno if it's the same thing as in 70-200 2.8.
I'm also interested in an approximate rate of lenses reported with decentering. How many folks from here had such a problem with 70-200 2.8?
The DC motor in the DFA* 70-200 is just fine from my point of view. My subjective impression is that the focusing speed is similar to the DA 16-85. It's a much heavier lens, so I guess the motor is actually more powerful to cope.
The weather resistance is also the superior AW (All Weather) type, rather than WR. It can achieve this because zooming is internal; the lens does not move in and out when zooming, thereby drawing in air.
Mine is optically
perfect stunning. No issues there.
My guess is that some users may swap to the f/4 version when it eventually appears, as the size and weight is a bit of an issue. Personally, I would have a hard time giving it up.