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Pixel Peep This

Discussion in 'Open Discussion' started by Amin Sabet, Nov 20, 2012.

  1. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    I was just flipping through some images from a friend and thought it would be interesting to get some feedback on some crops.

    Here are some details:
    -These are 100% crops from a single image, processed from RAW in the latest version of Lightroom with a bit of VSCO film emulation added (explains the graininess)
    -The file was shot at the camera's base ISO
    -The lens was stopped down 1/2 stop from wide open
    -EXIF info has been stripped
    -Camera is a Micro 4/3 camera, and the lens is a manually-focused adapted lens (explains the backfocus)

    I'm interested in your comments about the lens and camera performance based on these crops. Any and all comments are welcome.





  2. jalex

    jalex Mu-43 Veteran

    Aug 24, 2010
    Some nasty blue/ purple fringing. Did they try to correct it in Lightroom? I get that a lot with various canon fd lenses. One reason I don't use them as much now that there are so many great native lenses.
  3. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)




    These next two crops are from the same shot:


  4. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    Nope, no color fringing corrections have been applied. I'm also not sure how successful such corrections would be with the fringing dispersed in shots like this:


    Other observations? If these were crops from a new lens being released, would they be in any way encouraging? Discouraging? In what ways?
  5. jalex

    jalex Mu-43 Veteran

    Aug 24, 2010
    I'm not crazy about the bokeh. It kind of reminds me of my Konica 40 f1.8. It's kind of interesting in some shots but I like smoother bokeh generally.
  6. lubov

    lubov Mu-43 Veteran

    Apr 4, 2011
    Whats the punchline...it,s an expensive lens?:smile:
  7. Chrisnmn

    Chrisnmn Mu-43 All-Pro

    Apr 26, 2012
    Auckland, New Zealand
    The punchline might be, im guessing this is high praised lens or an upcoming supposed to be amazing one, showing terrible CA all over the place and quite not good corners....right?.

    And yes whatever the lens is, thats some terrible CA. for me at least.
  8. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    So we've got one vote for the opposite of smoother bokeh and a couple folks noting the color fringing.

    Anyone agree or disagree with those observations?

    Anyone want to say anything else about the lens in terms of longitudinal CA, coma, or anything else?

    Any observations about the camera dynamic range, etc?
  9. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    Same camera and lens stopped down a bit...

    Whole shot resized:


    Top right:


    Bottom edge center:


    Bottom right corner:

  10. RevBob

    RevBob Super Moderator Subscribing Member

    Jun 4, 2011
    NorthWestern PA
    Still lots of purple in the top right, although the sharpness doesn't seem bad for a corner.
  11. hkpzee

    hkpzee Mu-43 All-Pro

    Sep 5, 2011
    Hong Kong
    From the first series of crops, it looks almost like the picture is taken with a donut, er mirror, lens, but that is probably just due to some serious astigmatism!
  12. Chrisnmn

    Chrisnmn Mu-43 All-Pro

    Apr 26, 2012
    Auckland, New Zealand
    soft corners for sure. little details from the sensor. maybe an old pen?. or maybe a new cell phone camera?.
  13. phrenic

    phrenic Mu-43 All-Pro

    Sep 13, 2010
    Hmmm yeah a lot of purple fringing. Subjectively, I would say I'm not a fan of the bokeh rendering.
  14. dav1dz

    dav1dz Mu-43 Top Veteran

    Nov 6, 2012
    The suspense is killing me.

    Cue music.

    I can't wait the final reveal. I'd wager that it's a fairly famous lens.
  15. svtquattro

    svtquattro Mu-43 Veteran

    Sep 24, 2012
    Vancouver, Canada
    Mirror lens I say! The donuts are rather characteristic? Zuiko 500mm f/8 or Bigma!

    Or the body cap lens?
  16. romzL

    romzL Mu-43 Regular

    May 20, 2012
    Those color fringing are really an eyesore and the bokeh seems to be all over the place.

    what lens is it? im so curious now.
  17. LeoS

    LeoS Mu-43 Top Veteran

    Aug 6, 2012
    A leica lens? :) 
  18. arentol

    arentol Mu-43 Veteran

    Jun 29, 2012
    Those don't look like mirror lens donuts to me. That is just standard bokeh circles you get when shooting back-lit leaves with some lenses.

    For instance, check out 4:20-4:40 in this video that shows similar bokeh results with four modern 24-70 f/2.8 lenses. Indeed, look at the video itself right before and after that, where you see the exact same thing in the trees behind That Nikon Guy:

    [ame=https://www.youtube.com/watch?v=XjL0k6Yntcg&list=SP029043243BB9DB72&index=4&feature=plpp_video]24-70mm f2.8 Showdown! 3 - BOKEH - YouTube[/ame]
  19. troll

    troll Mu-43 Veteran

    Jan 25, 2012
    Looks like it's bad post-processing that led to most of the ugliness in this image, every single flaw like CA/PF was multiplied and the added "grain" doesn't look good at all.
  20. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    As I pixel peeped images from this lens, I thought about how they'd get slammed at Rangefinderforum if they were samples from the latest Cosina Voigtlander lens or at DPR if they were samples from some upcoming fast Olympus prime. In addition to the harsh bokeh, corner softness, and purple fringing some of you mentioned, there's a fair amount of longitudinal CA as shown by the green fringing on bokeh circles here:


    On the sensor side of things, people often take clipped highlights and blocked up shadows from a few crops as some kind of evidence of "bad dynamic range", especially if it's coming from a brand they associated with that characteristic. Crops like this:


    Here are a few quotes from some of the B&H customer user reviews for this lens. I didn't cherry pick these from a minority of reviews. These are 4 of the 6 reviews, all of which were 5-stars:

    Steve Huff said:


    Many of you knew a punchline like this was coming. In fact this is not an adapted lens on a Micro 4/3 camera. It's this lens used on this camera. Photos courtesy of my brother's recent Flickr stream :smile:.

    I'm not posting any of this to badmouth this lens. In fact, I think it may actually be the best 35mm lens made today for any system. My point here is that pixel peeping a crops from and handful of pictures from any lens isn't going to be the best way to get a sense of it's overall virtues. So often I see a CV lens get called out for "harsh" bokeh - an example being the CV 40/1.4, which is famous for harsh bokeh and yet gives smoother bokeh under controlled test circumstances than the 40mm Summicron-C, a lens known for smooth bokeh.
    • Like Like x 6
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