Here is the Canon RF 16mm f/2.8 STM

gruhl28

Canon 70D
Jul 26, 2013
175
63
Just watched Gordon Laing's review:


Interestingly, the RF 16mm f2.8 and the RF 14-35 f/4 have the same problem with soft corners that don't sharpen up with smaller apertures, both being software-corrected, while the RF 15-35mm f/2.8 has optically sharper corners.

What was surprising though in the review was that the corners of the RF 16mm f2.8 were slightly sharper than those of the RF 14-35 f/4. Is this a case of prime vs zoom, with slightly better prime results when both use software corrected corners?
What struck me about the review was that he said the corners of the 16mm improved upon stopping down, which contradicts other results. Although I can't say that I saw much of a difference apart from vignetting getting better, but maybe the resolution of the video limited how much I could see. I was also surprised that the 14-35 didn't look significantly better than the 16mm, which also contradicts other results that have shown the 14-35 to be very good in the corners even with the distortion correction. My tentative conclusion (hope) is that perhaps the 16mm is better in the corners at longer distances than close up. See my comment and Neuro's reply in the 14-35 thread about this: https://www.canonrumors.com/forum/t...tortion-correction-testing.41022/#post-917468
 
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LogicExtremist

Lux pictor
Sep 26, 2021
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What struck me about the review was that he said the corners of the 16mm improved upon stopping down, which contradicts other results. Although I can't say that I saw much of a difference apart from vignetting getting better, but maybe the resolution of the video limited how much I could see. I was also surprised that the 14-35 didn't look significantly better than the 16mm, which also contradicts other results that have shown the 14-35 to be very good in the corners even with the distortion correction. My tentative conclusion (hope) is that perhaps the 16mm is better in the corners at longer distances than close up. See my comment and Neuro's reply in the 14-35 thread about this: https://www.canonrumors.com/forum/threads/rf-14-35mm-f-4l-is-–-distortion-correction-testing.41022/#post-917468
Agreed, it appears that the corners do look better at longer distances on the RF 16mm, and Neuro's testing at longer distances was very insightful, and simulated real-world use more accurately.

When Gordon stopped down the lenses in the review, the corner sharpness increase was very slight, not in the order of magnitude that you normally see on other RF lenses in the same tier such as the budget RF 35 and RF 50.