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  1. #1
    Rob Skeoch's Avatar
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    G Claron 240mm issue

    I just bought a Schneider G-Claron 240mm F9 ... the lens is in very nice shape but... it doesn't seem to cover 8x10. I have fall off in all four corners in a photo with no shifts, or rise/drop. Any ideas. The photo was a test shot of a large building.
    -Rob Skeoch

  2. #2
    JG Motamedi's Avatar
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    The first question (sorry if this seems stupid): Are you using any sort of hood, filter or adapter ring?

  3. #3

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    Dear Rob,

    According to this, the 240mm G-Claron does not cover 8x10.

    http://www.schneideroptics.com/photo...aron/chart.htm

    Neal Wydra

  4. #4

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    Quote Originally Posted by Neal
    Dear Rob,

    According to this, the 240mm G-Claron does not cover 8x10.

    http://www.schneideroptics.com/photo...aron/chart.htm

    Neal Wydra
    Yes, but Schneider's published coverage numbers are notoriously pessimistic.

    I have a 240 G-Claron and at infinity, stopped down (f32 and smaller apertures), mine covers 8x10.

    At what aperture(s) did you check your lens?

    Also, lens hoods (previously mentioned) and screw-in filters can cause vignetting.
    Tom Hoskinson
    ______________________________

    Everything is analog - even digital :D

  5. #5
    Mateo's Avatar
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    What F stop are you using, it makes a difference.
    "If I only had a brain"-Some badly dressed guy made of straw in some movie I think I saw

  6. #6
    Rob Skeoch's Avatar
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    Good question... yes I had a orange 52mm filter on and a small rubber hood.
    However on my test I also tried some front rise that had a huge amount of drop off on the resulting pics.

  7. #7
    Rob Skeoch's Avatar
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    I shot at f45.

  8. #8
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    Shot on a piece of 7X17 film a Schneider 240 G-Claron has a useable circle of about 405 to 410 mm. You're doing something wrong. Try again.
    He is no fool who gives what he cannot keep..to gain that which he cannot lose. Jim Elliot, 1949

    http://tonopahpictures.0catch.com

  9. #9

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    Hmmmm. Very strange. Have you tried it without the rubber hood?

  10. #10
    Rob Skeoch's Avatar
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    I'll try with out the hood & filter.
    -Rob

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