LarsHP
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 Re: Voigtlander 28mm f/2 Ultron II Review | |
Please revisit Bastian Kratzkes optical vignetting tests. That proves my point perfectly. Even the inner middle bokeh "ball" is clearly truncated, and the truncation becomes quite extreme in the corner. That wasn't the case with the Summicron.
Comparing Bastians measurement to Leicas graph is apples to bananas. I tested the two lenses on the same camera. That's apples to apples, and it's NOT subjective. You can measure the illumination in various places in the frame and conclude what I say.
Steve Spencer wrote:
LarsHP wrote:
I just revisited this thread and saw the discussion regarding vignetting.
Here's my vignetting test compared to the 28mm Summicron-M Asph II:
https://drive.google.com/file/d/17lD1EHQUpqPKRzU1hHIbNhlCpNGjI32w/view
The Leica lens has markedly less vignetting wide open, both in the mid-frame and corners. This was also easily seen when I did optical vignetting tests. Of course, it doesn't mean that the Ultron II isn't an f/2 lens, but as I have said previously in this thread, and as others also have found out, stopping down to f/2.4 only affects a small spot in the center (even at shorter focus distances). That wasn't the case with the Summicron.
When using the matrix light metering in my Nikon Z6UT, it often fooled the exposure (in aperture mode) creating underexposure. This didn't happen with the Summicron either. The vignetting in the Ultron II causes the illumination to decrease so sharply that I don't use the lens wide open at long focus distances, but stop down to at least f/2.4, since there is no practical gain shooting wide open.
That said, it's the only real complaint I have with this lens (apart from that it won't work on a stock Nikon Z camera).
I see the same vignetting behavior with my Nokton 50mm f/1.2, and I have seen others saying the same regarding the Ultron 35mm f/1.7.
Now I remember having this same sort of conversation earlier with you Lars. I just don't see the huge difference you describe in your own vignetting shots, nor in other shots, nor in the data provided by Bastian and Leica, nor in my own shooting. I am posting below the vignetting curves that Bastian included in his review of the Voigtlander 28 f/2 II and the official vignetting curves from the Leica data sheet for the 28 summicron Asph. As you will see these measured data contradict your subjective judgements about vignetting. In my experience this claim that the Voigtlander lens has vignetting that is so bad it is a huge problem but the Leica lens does not, just isn't supported by the data or the photographic evidence. Of course one could be bothered by the vignetting of both lenses. They both have a lot of vignetting, but the claim that the Voigtlander lens is a problem while the Leica lens is not in my view is refuted by the data.
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