Started May 20, 2012 | Discussions thread
Senior MemberPosts: 1,007Gear list
Re: fstop&sharpness
In reply to brian14478, May 20, 2012

If I understood your question correctly, then, yes, zoom lenses do perform differently depending on which range they are.

Usually we talk about the short and long end of the zooms, but may be some changes during the range.
For example, check the Tamron 70-200mm F2.8 review:

You can see that the qualiy drops a lot around the 135mm but gets better again on the long end.

Also, as a "general rule" lenses tend to perform better when stopped down by 2 points.

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I'm lazy to post my pics here. So you can look at them here:

 neo_nights's gear list:neo_nights's gear list
Pentax K20D Sony Alpha DSLR-A100 Pentax K-5 Sony Alpha NEX-6 Tamron SP AF 70-200mm F/2.8 Di LD (IF) MACRO +7 more
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