Looking at TDP, it’s really not much worse. The EF 16-35/4 has a bit over 2 stops at 16mm, the RF 16-35/4 has a bit under 2.5 stops at 14mm, so probably something like 1/3-stop difference. Not really meaningful, IMO.@neuroanatomist Indeed TDP shows them similar good catch. The only thing is that 16-35 has visibly lower vignetting than the RF version. This may or may not be a problem depending on the ISO one shoots at. If someone wants to shoot at low light with no tripod or with tripod but high iso (say for astro landscape work) then this would be a problem. Unfortunately the same applies to RF15-35 too. It is worse that the EF 16-35 2.8L III which is worse than 14mm 2.8L II.
Again from TDP, the EF 14/2.8 II has over 3 stops of vignetting, and the EF 16-35/2.8 III has over 4 stops; stopped down to f/4, it’s still >3 stops. The EF 24/1.4 II and 11-24/4 both have over 4 stops, as well.
Based on those numbers, I’m not seeing how the RF 14-35/4 has a ‘problem’ with vignetting.
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