Canon RF 28mm F2.8 STM Review
November 29, 2023
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Mark Goldstein
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Sharpness at 28mm
For this test, the Canon RF 28mm F2.8 STM lens was attached to a Canon EOS R8 body, which was in turn mounted to a sturdy tripod. Exposure delay mode was activated. Tonal and colour variance across the crops are due to change in natural light during the session.
![The full frame](/images/photographyblog/1x1-grey.gif)
The full frame at 28mm
Centre sharpness is outstanding from wide-open at f/2.8 all the way through to f/11, with f/16 being slightly affected by diffraction, and f/22 even more so.
The edges aren't as sharp as the centre, with the best results obtained from f/4 through to f/11.
Aperture | Centre Crop | Edge Crop |
f/2.8 | ![]() |
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f/4 | ![]() |
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f/5.6 | ![]() |
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f/8 | ![]() |
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f/11 | ![]() |
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f/16 | ![]() |
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f/22 | ![]() |
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