[Klaus]

https://venuslens.net/product/14mm-f4-ff-rl-zero-d/

Soon in this theatre

[toni-a]

FF 14mmf4 in a tiny lens...let's see if some compromises were done especially for vignetting, otherwise this is quite an achievement by Laowa

[Brightcolours]

FF 14mmf4 in a tiny lens...let's see if some compromises were done especially for vignetting, otherwise this is quite an achievement by Laowa

Voigtlander makes "tiny" 15mm lenses for a while now, in this rangefinder lens style. So, not the achievement you might think, it is not an SLR lens..

[faint]

I have a genuine question.

Considering that Leica, Nikon and Sony/Canon/Panasonic use filter stacks with significantly different thickness, how do 3rd party producers manage to fine tune corner performance for each system without modifying the entire optical scheme?

It's a common issue adapting M mount lenses to any other system, including the Z. So, if the Laowa 14/4 performs well on Sony E, can the same (corner) performance be expected on M or Z?

[Brightcolours]

They don't.

[faint]

This is what I believe too.

But, inevitably, this means lens X will perform very differently on different systems.

Because of the retrofocal design for wide-angle lenses, and perhaps less difference in sensor stack thickness, it wasn't much of an issue on DSLR cameras.

[Klaus]

Laowa isn't offering those extreme primes in R mount ...

[Rover]

They said it's because they found them to be generating too much color casts. But anyway, for the adventurous, the Leica M mount versions are there...

[Klaus]

This is what I believe too.

But, inevitably, this means lens X will perform very differently on different systems.

Because of the retrofocal design for wide-angle lenses, and perhaps less difference in sensor stack thickness, it wasn't much of an issue on DSLR cameras.

It may depend on the specific lens but generally, we haven't seen big differences with respect to cross-system (or cross camera) performance. 

Color casts etc are generally avoided with retrofocal designs (because of comparatively flat angles).
Symmetrical designs are more problematic (but rarely used these days).

FWIW, the Voigtlander 10/15mm are symmetrical.

[mst]

FWIW, the Voigtlander 10/15mm are symmetrical.

Yep, but with version III of the Heliar 15 it seems they successfully addressed the color cast issue.

It still vignettes like crazy, of course