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Thread: NEX-7 + CV, and Zeiss ZM lenses

  1. #51
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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Has anyone tried the ASPHERICAL Voigtlander 28/1.9 NEX-7? I know the new CV 35/1.2 Ver 2 is ASPH and works great on it.

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    Senior Member douglasf13's Avatar
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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Quote Originally Posted by jthurs View Post
    Has anyone tried the ASPHERICAL Voigtlander 28/1.9 NEX-7? I know the new CV 35/1.2 Ver 2 is ASPH and works great on it.
    It's not the ASPH that's the issue, but, rather the exit pupil distance to the sensor. My guess is that the 28/1.9 will have more color shift and detail smearing at the edges on the 7 than the 5N, but it's tough to predict how much more and whether it'll be relevant in use. You just need to buy one and find out.

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Quote Originally Posted by douglasf13 View Post
    It's not the ASPH that's the issue, but, rather the exit pupil distance to the sensor. My guess is that the 28/1.9 will have more color shift and detail smearing at the edges on the 7 than the 5N, but it's tough to predict how much more and whether it'll be relevant in use. You just need to buy one and find out.
    The 28/1.9 exit pupil seems to be further from the sensor based on the photos I've seen when compared to the CV 28/2 which seems to have minimal color shift on the 7. Whether or not it's the ASPH design that facilitates this, I'm not sure. And I know the 28 Cron also ASPH seems to work well with the 7 but the price seems to keep going up, so I bought the CV 28/1.9 which is en route to me. Still waiting for my NEX-7, pre-ordered in October so not sure when I'll be testing this.

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    I think you may be confusing the exit pupil with the rear element. I've only seen the lens diagram for the 28/2, and we'd need that to estimate the exit pupil. Or, maybe a pic from the front and back of the lens with the same aperture selected.

    The thing about color shift is that it may not show edge detail issues. For example, the ZM 35/2 shows minimal color shift on both the 5N and 7, but, according to Bjorn Utpott's tests, the 16mp 5N actually has more edge detail than the 24mp 7 until around f5.6.

    Of course, even if there is less detail on the 7, it still may be acceptable for you. Either way, we don't have a lot of 28 Ultron examples on any of the NEX cameras, so I think you'll just have to give it a shot to test on your own.

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Quote Originally Posted by kuau View Post
    so no one here has yet tested the ziess 18mm zm on the nex-7 yet?
    for me this is wide enough.
    I noticed over at digilloyd, he has been testing a lot of lenses, but nothing wider then 25mm so far
    I tried just one shot of my ZM 18mm on my new NEX 7. That is all it took to confirm what I expected: it shifts badly.
    Because my Biogon Contax 28 G also shifts on it, though less so, this suggests that the 7 is pretty close to where the original 5 was for colour shift. No idea at all how people can say that the wide CVs will be all right on the 7 when they are already troublesome on the 5N, which is significantly better. I also don't know how wide the Leica go before the 7 starts shifting. 28 should be OK, 24: maybe, wider than that doubtful. WATE, I'd love to see a simple blue sky shot with it. That is IMHO the simplest and best test for colour shift.

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Philber,
    I have heard other reports that the Zeiss 18mm is fine on the NEX-7. How are you processing the shot? JPEG SoC or RAW?
    Carlos Echenique | Carlos Echenique Photography |Olympus OM-D E-M1 MK II | Olympus Pen-F - M.Zuiko 17mm f/1.8, M.Zuiko 25mm f/1.8, M.Zuiko 45mm f/1.8, Rokinon 12mm f/2 NCS, M.Zuiko 75mm f/1.8, M.Zuiko 12-40mm f/2.8 PRO, M.Zuiko 40-150mm f/2.8 PRO

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Quote Originally Posted by etrigan63 View Post
    Philber,
    I have heard other reports that the Zeiss 18mm is fine on the NEX-7. How are you processing the shot? JPEG SoC or RAW?
    Shift is one thing--edges are the real issue.

    In truth, the Zm shifts on the 5n too, but it's subtle--I never bother fixing them


    zm 18 on 5n

    you need clouds on top of the frame to judge shift

    philber made me buy it last nov.

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    I skipped the 5N and received the NEX7 a few days ago. Althought, NEX7 users have reported the color shift and smeared edges of rangefinder wides, I had to see it for myself. At first, I was very disappointed in the Heliar 15, ZM25, and even the 35 Summicron ASPH, image quality improving with focal length. The Heliar is unusable on the NEX7, in my opinion. I'm starting to accept the strain the NEX7 is putting on the otherwise excellent ZM25. There is corner color shift and even a little lateral CA at the edge.

    The high pixel count and small pixels bring out every little imperfection of the lenses. My alarm with the 35 Summicron ASPH wasn't so much the corners but the added effort to get sharp focus with such high resolution.

    I was thinking the ZM18 is the answer for a wide on the NEX7, now I'm not so sure. The hole in my lens lineup is the effective 24-28mm range. Any ideas? SLR wides or a crop sensor wide zoom?

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Jim, I have not jet received the nex7, but have meanwhile bought an elmarit r 19 2,8.(type 2)
    Test made on m4/3 with a 12 MP sensor (pixel density equivalent to that of the 24 MP
    APS/C sensor) confirm that this lens easily out resolve the sensor. The 19 is strongly tele centric, no expected issues on the Sony.
    Sergio

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    test with the elmarit 19.
    Full image


    _1050405 by sergio lovisolo, on Flickr

    100% crop. Note moirč (Nyquist exceeded)


    _1050405a by sergio lovisolo, on Flickr

    Sergio

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Sergio, looks looks like a LOT of barrel distortion on the left side (the ochre building edge); is this a feature of this lens; I was not aware of it? Moiré noted!

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Kit, the effect is exaggerated by perspective distortion,camera rotation and also a little by the fact that tubing is not perfectly straight.
    Leica declares approx. 2,4% maximum distortion, and it is correctable e.g. with DxO tools.
    in this shot you can better evaluate it


    _1050102 by sergio lovisolo, on Flickr

    This elmarit, in my limited experience,is one of the best (if not the best) wide angle lens.MTF diagrams are simply spectacular, and general rendition is at the same time extremely sharp and natural.

    Sergio
    Last edited by sergio lovisolo; 20th February 2012 at 09:46. Reason: changed view of photo

  13. #63
    Subscriber Member kit laughlin's Avatar
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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Thanks Sergio; understand completely. I had all the Leica-R lenses at one stage and the best of the Zeiss range (the now-fabled 21/2.8 Distagon); the problem with that lens was its 'moustache' distortion which is difficult to correct completely.

    This distortion looks simple, which is good. A fabulous lens, definitely; thanks.

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    Re: NEX-7 + CV, and Zeiss ZM lenses

    Quote Originally Posted by JimBuchanan View Post
    ....... The hole in my lens lineup is the effective 24-28mm range. Any ideas? SLR wides or a crop sensor wide zoom?
    Jim, I carry the 21-35 Vario Elmar. I don't have a 7 but use it on a 5N with an R-M converter + Hawks as it doesn't focus too close. I think it's excellent and can cover the range of 4 lenses, although not a fast prime obviously.

    Mike

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