philip_pj
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Another issue is the choice of lenses. Not only are each (apart from arguably the 15mm, but what is the foreground detail here?) mismatched due to design intent, they are cherry-picked. Cosina market in VM form a 21/3.5, any of a handful of recent VM 28-35s and plenty of other 50mm lenses that might have more insightfully have been used. That would have been useful, but may not have made the predetermined case so well.
The lens choice rationale is pretty clear, that the maximum effect may come only from super fast high performance lenses, and that is why they were picked: 'all high performance lenses that perform very well on the filter stack they have been designed for from their maximum aperture, which means they *should be able to reveal those differences*.' So this: 'what they mean for *us*' clearly does not apply, unless you are one of the very few who seeks out the fastest aperture lenses available, for its own sake, and inspect the corner for your usage pattern.
And why wouldn't you want to provide a fair and balanced assessment of the issue, by using a different set of lenses and outlining the usage in which they work and don't work? It's the reason I post 1500 x 1000 pixel images - so viewers can see the qualities and regions of the image and (most important) the pictorial qualities, for themselves.
Many Sony users employ VM lenses on their Sonys for many reasons, and most of them can be assumed to know exactly what they have in mind when they buy in. Many do not even use an M camera. Many have no good reason to buy a Nikon. They may have many E-mount lenses. All kinds of personal reasons.
As an example of the suggested approach, if you were considering the new 50/2.2 Voigtlander (a VM lens) for a Sony, you would be more interested in vastly different forms of photography than those informed by far corner crops of 100m distant subject matter. It might account for 0.5% of your usage. See the samples on the cumulative pages.
I'd rather see more helpful written material for real world users.
BTW, Fred had this to say, in passing, when reviewing the 75/1.5:
'In my view, it's another lens that can be used for both systems. I'm using: CV 12/5.6, CV 21/3.5, CV 35/1.2 III, CV 50/3.5 and CV 75/1.5 on both Sony and Leica.'
I have two from this list, and agree with this opinion. And something I still remember from Zeiss at the dawn of mirrorless: the threshold for decent performance of M lenses on Sonys is 50mm. But they did not foresee someone choosing a ultra fast lens with sales of perhaps 0.5% of lenses of that focal length, just to prove a point.
In fact, the choice of going to such an extreme as to cherry-pick these lenses may indicate the sensor mismatch issue is not so large a deal for many photographers' usage. But you will never know, will you?
https://phillipreeve.net/blog/different-filter-stacks-and-what-they-mean-for-us-sony-e-nikon-z-leica-m-kolari-ut/
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