Another review claims Sony FE 70-200mm F4 OSS - Soft at 200mm

Hello,

Another reputable reviewer identifies softness at 200mm on the Sony FE 70-200mm F4 OSS:

http://slrgear.com/reviews/showproduct.php?product=1655

"Sharpness

The Sony 70-200mm ƒ/4 provides sharp results, even with at its widest aperture setting, between 70-135mm; at 200mm, we see a drop in sharpness, however.

When mounted on the sub-frame NEX-7, the lens produced sharp results at 70mm and ƒ/4. Zooming in to 100-135mm provides better results, however at 200mm sharpness drops off somewhat and the user must stop down for better results. Tack-sharp results are obtained by ƒ/5.6 at 100mm and 135mm, and ƒ/8 at 70mm, but at 200mm, no amount of stopping down will provide exceptional sharpness; there is always some trace of corner softness.

Mounted on the full-frame Sony a7R, sharpness results follow essentially the same trend as noted on the sub-frame NEX-7, with notably softer corners. Instead of ƒ/5.6, the sharpest results are obtained at ƒ/8, but with the exception of 100mm, we never see ''tack-sharp'' results from corner to corner"

Photozone also identified this:

http://www.photozone.de/sonyalphaff/870-sony70200f4oss?start=1

"The resolution is generally on a very high level except at 200mm @ f/4 where the corners are too soft"

J