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Voigtlander 15mm F4.5 meets the A6000

Discussion in 'Adapted Lenses' started by dsiglin, May 7, 2014.

  1. dsiglin

    dsiglin TalkEmount Veteran

    230
    Apr 23, 2013
    Greenville, SC
    The 15mm 4.5 is a well respected lens on film but it had some problems when put on the Nex 7, mainly magenta shift and mushy corners. The A6000 has an updated version of the Nex 7's sensor so clearly we should see what happens.

    Now this isn't scientific at all. I'm supplying the original file and one with the shadows lifted and highlights brought down. If I have time I'll take some daylight photos but this is what I've got for now.

    These were shot full manual, 1/160 @ ISO400 @F4.5

    027ccaacff6845958d885e7983f13c9d.
    Original photo converted from Raw to JPG in Lightroom 5.4

    0c303bf9144e4dc289e63664cb64dcea.
    Fugly as sin but now you can see more detail. The previous shadows are going to be noisy. Ignore that, this is for seeing how the magenta shift and smearing of details is.

    e354a8f49cf8441b9a0566c75cfff82c.
    Center of edited photo

    383462de77ba43df9394a9bd40f7d136.
    Top left of edited photo

    ca5f25616d054502bc62f189492ad0fc.
    Top right of edited photo

    84935cb35fe844ef835ba2beeb768530.
    Bottom left of edited photo

    a352842d67604dddbfca4edf733ca88e.
    Bottom right of edited photo

    8e1107c1a63b4d619434298354eafb54.
    Unedited photo, some weird not very nice transitions from the darker blue to gray in the water. Odd...

    Conclusion: Well the magenta shift is there and there are some smearing of detail. How this compares to Nex 7, can't say as I never had one. I'll leave it up to your comments....
     
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  2. Bimjo

    Bimjo Super Moderator

    Oct 28, 2011
    Washington State
    Jim
    Looks like about what it does on my 5N. A short trip through CornerFix or LR Flat Field easily fixes it. Smearing is another issue totally unfortunately.
     
  3. storyteller

    storyteller TalkEmount Veteran

    322
    Sep 25, 2011
    The smearing doesn't look too bad IMHO. I know it is fun to pixel peep but unless you are printing very very large a slight smearing will all but disappear. The lens also works better stopped down for two reasons.

    One, more perpendicular light rays and a bit less vignetting.

    Two, you can back it off from infinity and still be within the range of deep focus. At infinity the rear lens element is closest to the sensor and the light angles causing the smearing are at the most extreme.

    Love my CV 15mm but when IQ is paramount it needs a lot of light and careful thought IMHO.
     
  4. dsiglin

    dsiglin TalkEmount Veteran

    230
    Apr 23, 2013
    Greenville, SC
    The smearing is mostly in the top left which could be a slightly decentered lens. It's a fantastic, compact, aesthetically pleasing lens. However now that the Rokinon 12mm f2 is out I'd choose that over the Voigtlander. Both seem to be on the same level of resolution with the Rokinon having the clear light gathering advantage. Both exhibit very well controlled distortion. The Rokinon might actually be slightly less distortion. Both cost about $400. Both are a good choice.
     
  5. storyteller

    storyteller TalkEmount Veteran

    322
    Sep 25, 2011
    True. But the CV works on my A7 with some post processing. If I were still shooting APS-C the Rokinon would be a no brainer. Just a little bigger and over two more stops of light!



    Sent from my iPhone using TalkEmount
     
  6. dsiglin

    dsiglin TalkEmount Veteran

    230
    Apr 23, 2013
    Greenville, SC
    There is a 14mm 2.8 Rokinon though it has more distortion than the APS-C 12mm.
     
  7. MAubrey

    MAubrey TalkEmount Top Veteran

    The strength of the biogon design of this lens and its 12mm f/5.6 sister lens that I have is their minimal distortion. For me, color shift is a acceptable price to pay. It's easier to run photos through LR's Flat Field plugin than deal with the sort of mustache distortion you see with most retrofocal ultrawides (including the Rokinon/Samyang 14mm).
     
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  8. Dan Euritt

    Dan Euritt TalkEmount Regular

    191
    Jan 11, 2014
    shooting at f/4.5 is probably not the optimal setting for clean corners, but that smearing doesn't bode well.

    i can't see it improving much, but f/10, better lighting, and a wide flat subject matter field would be interesting.
     
  9. dsiglin

    dsiglin TalkEmount Veteran

    230
    Apr 23, 2013
    Greenville, SC
    This particular copy had slight decentering I think. It's worst in the upper left. The Rokinon 12mm had the same problem. I got a replacement for the Rokinon which performs well in the corners. I sold the Voigtlander.