Glad to hear that someone else noticed it at least. It was exactly the same type of color cast on both the Loxia 25mm and the Loxia 35mm, so I suspect an inherent mismatch, rather than a loxia lens specific abberation, or an adapter issue. It is easy to overlook the cast in bright sunlit scenes, and it also depends on your raw workflow how apparent the issue is, but it is there for certain. Luckily, it is within bounds for correcting with the CO1 LCC tool. It is not neccessary to do this on a shot per shot basis. The cast is so consistent that a single correction profile works on all images, so it is very easy.
johnvanatta wrote:
I saw the same thing with the Loxia 25 on the Z7. Cyan tinting towards the edges. I tried with three or four different adapters, and it was always there. It's possible all the adapters were too short, I didn't experiment with shimming them. Between that, the field curvature, slight focus shift, and IBIS failing on the TZE I concluded it wasn't worth it for me. Results weren't actually better across the frame than my 14-30 stopped down.
My CV 65/2 doesn't have a strong tint. There may be a small amount, I'd need controlled testing to be sure--but it's not obvious on inspection like the Lox 25 was. ...Show more →
Actually, the Loxia lenses focus júst past infinity by design, to allow for deviations caused by temperature differences and field curvature. This was debated close after the release of the Loxias. All my 3 Loxias focussed júst past infinity in the frame centre on the Sony A7RII, but since the Sony e-mount cameras offer excellent MF assist, this was apparently not seen as a negative by Zeiss. B.t.w. the Loxia 35mm has exactly the same color cast signature as the Loxia 25.
Steve Spencer wrote:
PS - if your lens focuses past infinity the adapter is likely too short. Almost all of them are. If it is close it won't matter too much, but for optimal performance of a floating element lens like the Loxia 25 you want the adapter to the exact thickness needed to keep the proper flange distance. That your Schoten adapter is like the TechArt adapter is no guarantee it isn't too thin. I am pretty sure my TechArt adapter is too thin. Adapter makers tend to error on the thin side because a too thick adapter is much more noticeable (you can't achieve infinity focus) than a too thin adapter (which only causes serious problems with lenses with floating elements and then for some lenses much more than others)....Show more →
Jun 01, 2020 at 05:41 AM
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ChrisMak wrote:
Actually, the Loxia lenses focus júst past infinity by design, to allow for deviations caused by temperature differences and field curvature. This was debated close after the release of the Loxias. All my 3 Loxias focussed júst past infinity in the frame centre on the Sony A7RII, but since the Sony e-mount cameras offer excellent MF assist, this was apparently not seen as a negative by Zeiss. B.t.w. the Loxia 35mm has exactly the same color cast signature as the Loxia 25.
Yeah, I know they focus just past infinity (I have had four of them) but that is just it--it is very hard to tell the difference between just past infinity and just past infinity and a little more. Unless you have a Z7 camera and a Sony E mount camera at the same time (as I do) and carefully compare both the perfect infinity focus and exactly how much the infinity focus is short of the hard focus stop it is very hard to detect whether the adapter is too thin. When you do make that comparison you can both see that it is very hard to find an adapter that is thick enough and you can shim an adapter for better performance.
PS - I don't think there is any reason to think there is an inherent mismatch. IMO, this seems to me to be a software correction issue. On the Sony that software correction is likely built-in; on the Nikon cameras it has to be applied in post processing. Nothing really new there at all (you would see the same thing with many Sony. Nor is it surprising you don't see these issue with the Loxia 85 or Loxia 50 as these longer lenses have less of these issues. I am surprised that we don't see it with the Loxia 21 (maybe it is there but a bit more subtle or shows up in fewer circumstances), but Jim Kasson didn't see it in his tests and I don't see it in my files either. One thing is clear to me, we probably can't sort out all these issues and any conclusion we make should be quite tentative.
