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Weird color fringing/blooming Sigma 18-35?

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  • Weird color fringing/blooming Sigma 18-35?

    Was wondering if anyone can tell me what's going on here. I'll get a blooming effect often with a blueish tint and I'm trying to figure out the cause. I believe its the lens, but I don't know what or why it's occuring. Is this a common problem with the Sigma 18-35 or have I just got a dud?



    fringing_1.7.1.jpg

    Here is a link to the DNG: https://www.dropbox.com/s/qibb0hac80...00831.dng?dl=0
    Last edited by RomanStone; 04-01-2019, 05:09 PM.

  • #2
    Are you using any filters? Wide open?

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    • #3
      What camera is it mounted on? Any adaptors? Or focal reducers?

      Are the optics clean? Is that flare?

      When you shone a bright light (torch) through the lens, are the optics clear?

      BTW, if ever you'll see colour fringing on a lens, it'll be with that particular lighting condition - a dark subject over a bright, white background.
      Last edited by trispembo; 04-01-2019, 08:40 PM.

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      • #4
        IR CUT Filter and an ND Filter. I believe this wasn't wide open. Mounted on a UM 4.6k and using a Nikon to EF adapter. After reading your posts, I'll have to try out the scenarios you guys laid out to try and narrow down the culprit.

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        • #5
          It looks like flare to me, personally. A matte box or lens hood helps. I would never shoot outside without one. People have also been known to use gaff tape or paper and rig a makeshift one if need be.

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          • #6
            Originally posted by RomanStone View Post
            IR CUT Filter and an ND Filter. I believe this wasn't wide open.
            When using filtration, you're even more likely to encounter flare or other strange artefacts. As Geran mentioned, try to use matte box, lens hood or something to protect filters/front element from stray light hitting it.

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            • #7
              yeh looks like a veiling flare. Mattebox or dinkum lens shade https://www.bhphotovideo.com/c/produ...m_Compact.html
              Darren Scott
              Freelance Director/Director of Photography


              https://vimeo.com/jambredzvisions/videos

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