Interesting. The only thing that pops into my head is they way the element grouping is moving when you zoom in and out. Some zooms just don\'t follow a straight path they readjust to different focal lengths.
One thing I thought of when you went to 50mm most likely you went wide to normal but I\'m very curious if you went 70 to 50 is their a different result. Some zooms have weak spots and a interesting quick test to try . Your 50mm test just seemed out it jumped from really nice at 35 to weak at 50 than good at 70mm. Just seems odd
Apr 01, 2016 at 11:29 PM
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