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RF 50mm f1.8 stm review.

Started Dec 29, 2020 | Discussions thread
moon1029 Regular Member • Posts: 304
Re: RF 50mm f1.8 stm review.
2

Karl_Guttag wrote:

Swerky wrote:

The digital picture have finished the review of the RF 50mm 1.8. Wasn't the larger mount diameter supposed to bring, among other things, less vignette to the image? Perhaps I'm wrong.
https://www.the-digital-picture.com/Reviews/Lens-Vignetting-Test-Results.aspx?FLI=0&API=0&FLIComp=0&APIComp=0&Lens=1528&Camera=1508&LensComp=989

I think that was the technical reason they gave for the RF mount over say Sony's E mount. But then it seems all the canon lenses, even the L-lenses have significant vignetting without any digital correction (seems to get mentioned in every technical review). I don't think any of the vignetting is being caused by the diameter of the opening, but more a factor of the lens design.

At the same time, there is amazing little chroma aberrations after correction. I wonder if these issues are linked. It feels like the Canon designers are designing lenses with correction expected. The let parameters go that can be corrected in software. Of course, correction comes at some cost.

I think that's a lens design trend rather than for technical reason. The EF 16-35 f/2.8L III has far more vignetting than the II version, and the RF 15-35 and EF-16-35 f/2.8L III are similar in this deparment. Canon's engineers are probably trading sharpness and contrast for vignetting.

 moon1029's gear list:moon1029's gear list
Canon EOS R5 Canon EOS R6 Canon 85mm F1.4L IS USM Canon RF 15-35mm F2.8L IS USM Canon RF 70-200 F4 L +6 more
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