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EXCERPT page containing first few paragraphs. 2019-07-18 19:39:42

How the Lenses Were Evaluated

The lens evaluations found in this Guide for Nikon and for Canon are based on both research and field use by me. Note that any Nikon non-“G” lens can be used on Canon EOS with a mechanical lens adapter.

The term stopped down means to f/11 (DX sensor) or f/16 (full frame sensor). At f/16, even the best lenses might have a faint hot spot. At f/16 contrast and/or sharpness degrades. Stick to f/11 unless f/16 is really needed, especially on sensors that are less than full-frame (smaller photosites demand more from the optics).

Assessments use the rating scale discussed below.

Rating scale

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