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What kind of defect is this?

Discussion in 'Adapted Lenses' started by karlstorck, Feb 10, 2010.

  1. karlstorck

    karlstorck Mu-43 Rookie

    11
    Jan 20, 2010
    Linköping, Sweden
    What is going on in the upper left corner?
    Olympus E-P1 and Voigtländer 21/4 Color Scopar II pancake

    4346103387_b53c17f684.jpg
     
  2. soundimageplus

    soundimageplus Mu-43 Top Veteran

    782
    Feb 2, 2010
    Worcestershire
    artefacts

    Its discolouration is caused by a demosiacing problem, caused by using W/A adapted lenses. The sample is small. Do you have a "maze" type pattern as well?

    This is about it the problem. http://www.flickr.com/groups/1084614@N23/discuss/72157622637978730/?search=mazehttp://www.flickr.com/groups/1084614@N23/discuss/72157622637978730/?search=maze

    Its because the lenses are film lenses, not designed for digital. Are you processing from a Raw file in Photoshop or Lightroom?
    Previous problems have been cured by a new version of Adobe Raw converter. If the problem is from raw, then you could try another converter.
    If its on the jpg. its not fixable. Its a lens mismatch
     
  3. Brian S

    Brian S Mu-43 Top Veteran

    714
    Apr 11, 2009
    This "Maze" effect has got to be a result of some software algorithm in the camera or post-processor running amuck trying to do some sort of anti-aliasing?

    This problem does not occur when using "film lenses" on a Leica M8 (or M9), which do not have AA filters. Nor did it occur on my old color Kodak DCS series cameras.

    Whatever firmware that has gone wild, is there a way to disable it? I'd rather have the moire effect that creates a couple of speckles in the image than this crazy pattern!

    Looking at some sample images: you would get artifacts that look like this with some sharpening algorithms. Would in-camera, or post-processing, sharpening settings affect this artifact? A long time ago, I just learned to turn sharpening off on my Digital cameras.
     
  4. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    it's great to have Brian S on this forum - adds another very knowledgeable dimension

    (I am/are/have been a lurker on the RF forum - so I "recognise" Brian)
     
  5. karlstorck

    karlstorck Mu-43 Rookie

    11
    Jan 20, 2010
    Linköping, Sweden
    Thanks. To answer your questions, I have a maze problem in that particular zone, yes. I didn't know that but now when I look for it, it's there all right. I'm running Lightroom 2.6 with CR 5.6. Can I something about it in CR you think?

    Thanks again
    Karl

     
  6. soundimageplus

    soundimageplus Mu-43 Top Veteran

    782
    Feb 2, 2010
    Worcestershire
    Try using the Olympus software to process the file. In the case of the problem that I linked to, this was happening on Panasonic cameras processed in Photoshop or Lightroom. It DIDN'T happen if the supplied Silkypix software was used. The Olympus raw conversion software may solve the problem.
    Theres no way to fix it in CR 5.6. With the Panasonic problem it only got fixed when a new version of Camera Raw was brought out.
    I personally had this problem with a Voigtlander 15mm lens. It now works fine on Panasonic cameras but not on my Olympus E-P2.I get the same problem that you do.
    It does only seem to happen on M-mount wide angles, and Voigtlanders are prone to it + some Zeiss lenses. Some lenses seem unaffected by it. A lot of the Zeiss lenses are made by Cosina who also make the Voigtlanders and they were designed as film lenses.
    Hopefully the Olympus software will work and Adobe will update their raw converter to eliminate it.
     
  7. soundimageplus

    soundimageplus Mu-43 Top Veteran

    782
    Feb 2, 2010
    Worcestershire
    It only happens with m-mount lenses on m4/3. The same lenses are fine on the Leicas.
    Its seems its a software "omission" that happens when files are processed in Photoshop.
    It took a while to track it down and it did get solved for Panasonic files. However it seems the software algorithms that Olympus has passed to Adobe haven't caught up with this "bug" yet.