Ich halte das RF 16mm F2.8 schon wegen seiner unvertretbar korrekturbedüftigen Vignattierungswerte für, sorry, für bildmäßiges Fotografieren einfach
unbrauchbar . Jedenfalls wären mir die durch dieses Objektiv zugemuteten Einschränkungen technischen ein ganz klarer Grund, es bei Erwägungen zum Objektivkauf zu übergehen.
… zur Güte: Einige Testergebnisse zum Objektiv Canon RF 16mm F2.8 STM:
(Text in englischer Sprache, Zitate jeweils im Auszug,
aus:
https://opticallimits.com/canon_eos_ff/1136-canonrf16f28 )
Zitat:
« Distortion
The lens produces a native barrel distortion of almost 10%! This is excessive, making it basically unsuitable for use without digital correction. The latter does an excellent job by reducing the issue to essentially zero. While this is commendable, there is a price to pay for this because the image is stretched substantially,
thus reducing resolution in the outer image field.
Vignetting
(…)
At f/2.8, the corners are essentially black and [they are] not much brighter at f/4. The vignetting exceeds our usual scale even at f/11.
The problematic corners are getting pushed off the frame with activated distortion correction but deactivated vignetting correction.
The vignetting is still heavy at f/2.8 but not terrible when stopped down, considering the ultra-wide nature of the lens.
With full correction enabled, the results are quite good even at f/2.8 because the light falloff is very gradual from the center to the corners.
Needless to say but the signal boost comes at the cost of increased image noise in the outer image field.
MTF (resolution) at 45 megapixels (EOS R5) — Grafik, URL:
https://opticallimits.com/images/8Reviews/lenses/canon_rf16_28/mtf.png
Usually, we test the resolution in uncorrected mode because the quality of the correction is also heavily dependent on how it is performed, and unless the distortions exceed 4%, there isn't much of an impact anyway. However, it makes no sense to do so in this specific case.
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The Canon RF 16mm f/2.8 STM is just not designed for being used without correction. <