Zeiss Milvus Lenses – Hands On

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7 Responses

  1. AndrewZ says:

    I think your understanding of LoCA is a little off as I see from this and the 135 review. LoCA overall does not get worse towards the edge of the frame but is present to the same degree all over the frame as its caused by focused depth. Lateral CA is caused by different magnification so would be fine in the middle and worse at the edges. Now its true that field curvature may be different for each colour and you could have LoCA being worse towards the edges but not significantly so. Secondly I can still see plenty of LoCA in the teapot shot even at web sizes. The top has a definite green tinge and the pouring lip takes on a reddish glow. In the wide open motorcycle shot there is a red glow all around the metal parts. Zeiss makes great lenses but LoCA is the lowest priority on their standard lenses and these don’t seem any different.

    • Thanks for the comment AndrewZ, it’s more about my expression abilities (especially in English) than about misconception of color aberration types. I believe that explanation of the differences between those two types are readily available on the web and easy to understand. Slightly more difficult is to properly identify them on the image, considering effects of the field curvature, spherical chromatism (spherochromatism), stray UV light, noise and processing, etc.
      I can’t go through my articles to check for all mistakes, and it is quite possible that I wrote somewhere that LoCA is more visible toward edges, simply because subject in focus is usually in the mid frame. I also could make a typo error (thinking two lines in advance), writing LoCA instead of CA… This is where comments like yours are invaluable.
      Looking at the images you mentioned I really don’t see much of mentioned red glow, the green is present in a very small amount considering the scene itself. On the motorcycle shot (wide open) I can hardly notice color aberrations, but then I might be color blind. All I can say is – try to use Canon 85/1.2 L in similar situations and let’s talk about CA corrected optics.
      BTW, I am testing Milvus 85/1.4 and 50/1.4, comparing them to the Otus equivalents and classic Planars (ZF). While Milvuses are much better corrected optics than their prdecessors, they are still lacking behind Otus, especially in the CA department. (By CA I mean all chromatic aberrations, not only Lateral as sometimes CA is referred to.)

      Thanks again for your comment.
      Cheers,
      Viktor

  2. AndrewZ says:

    Oh yeah the Canon 1.2 is horrific and for that matter the so its the 1.8. Its more that I’m disappointed because I can’t see the improvement compared to the old 85/1.4. I suspect the next gen Canon will be fantastic as the BR optic seems to really work. Sorry I should have been more specific the bit I picked up on was “Most lenses would be apochromatically corrected in the center of the frame, but problems starts when we move toward edges” in the 135 review which technically is not correct because LoCA is still present in the middle. In fact Apochromatic is specifically concerned with bringing the different planes of focus into the same focal plane (LoCA) and can actually end up with quite a bit of lateral chromatic aberration (the 180mm Leica telyt is a perfect example of this).

    • AndrewZ says:

      Oh and if you want to see how bad the new 80 1.4 can be take a look at the full version of the F2 shot of the building at the bottom of the dearsusan blog. The buildings and trees in the foreground are really covered in a red glow.

      • We were together in Oberkochen when that shot was made, and while I admit that purple fringing is visible, those were one of the worse conditions you would ever shot with any lens… I mean, it was around 12 am (or there about) strong direct sun from above, high contrast buildings. In the situation like this, old Planar would fail much worse. While I didn’t really tried it there, I bet that Otus would be just fine…
        Cheers,
        Viktor

    • Hi AndrewZ,
      I agree that my statement is not really clear and that I should have been more specific. The thing is that many optical designers I had a chance to talk to, referred to Apochromatic lenses just in terms of lateral CA correction, while Axial is corrected to the different extent, despite APO designation. Whatever terminology we choose, I wanted to say, that writing APO on the lens barrel, doesn’t necessarily mean that lateral CA is corrected, which was the case with many old lens designs.
      There are some serious breakthrough within modern optic designs, including Fresnel based optics, BR optics as you mentioned and mainly software correction including convolution and other “smart” algorithms. As I said, testing Otus, Milvus and “old” Classic Zeiss lenses, it is nice to see the improvement of several aberrations by Milvus, but Otus is in the league of its own. I really tried hard to reveal any sort of CA, but both 55 and 85 didn’t give-up. In a month or so, Verybiglobo comparative review should be ready, so you might get back to check my findings. Your comments and suggestions will be always appreciated.
      Cheers,
      Viktor

  1. September 13, 2015

    […] All news were put in a separate post here – http://www.verybiglobo.com/zeiss-milvus-lenses-hands-on/ […]

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