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PL 15mm Astrophotography Issue

Discussion in 'Native Lenses' started by alpenglow.photo, Apr 15, 2018.

  1. alpenglow.photo

    alpenglow.photo New to Mu-43

    Apr 15, 2018
    So, I've recently purchased a Panasonic Leica 15mm f1.7 for landscape astro.

    There is some noticeable C.A. appearing as purple halos around large stars.

    Image shown is 100% crop, about half way from center to edge.

    Image data: Oly E-M10 II, PL 1.7/15mm @ f1.7, 15s, ISO 1600

    Can anyone provide advice on the most likely reason for the severe C.A.?
    1) That is a normal amount of C.A. for a lens wide open
    2) The PL 15mm corrects C.A. badly
    3) The PL 15mm has bad C.A. when used on Olympus bodies
    4) Image is a mis-focus
    5) I have a faulty lens copy
    6) Something else?
  2. The PL15 has bad purple haloes around bright light sources (especially when out of focus) when used on an Olympus body, due to weaker UV filtering on said bodies.
  3. alpenglow.photo

    alpenglow.photo New to Mu-43

    Apr 15, 2018
    Thanks for your reply.
    Is it all Panasonic lenses on Olympus bodies that have this issue, or just the PL 15mm?
  4. Vivalo

    Vivalo Olympus loser

    Nov 16, 2010
    It is very common at least...
    • Like Like x 1
  5. alpenglow.photo

    alpenglow.photo New to Mu-43

    Apr 15, 2018
    Which other lenses are likely to perform better for landscape astro?
    Oly 12mm f2
    Oly 8mm f1.8
    Samyang 12mm f2 (bad QC?)
    Laowa 7.5mm (bad coma?)
    Sigma 16mm f1.4
  6. tkbslc

    tkbslc Super Moderator

    If that is true, can you use a HQ UV filter on the front of the lens to compensate?
  7. I hadn't considered that. Not sure what frequencies would need to be filtered.
  8. Turbofrog

    Turbofrog Mu-43 Legend

    Mar 21, 2014
    The difference in UV-cut on the Panasonic vs. Olympus sensors is basically equivalent to a Haze 2A or 2E (from Wratten, Tiffen, or Formatt) or a B+W 420.

    However, one downside of this filtration is that these filters are apparently not coated, so they reduce transmission somewhat. Which is not great for astrophotography, obviously, where you always need as wide an aperture as you can possibly get.
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