Help a brotha out - pics are dark around the edges
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This is a discussion on Help a brotha out - pics are dark around the edges within the Member Show-Off & Photography forums, part of the Community - Meet other Enthusiasts category; I just bought a used canon efs10-22mm lens for those hard to get fish eye shots. I've noticed in screwing ...

  1. #1
    Registered User dsel's Avatar
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    Help a brotha out - pics are dark around the edges

    I just bought a used canon efs10-22mm lens for those hard to get fish eye shots. I've noticed in screwing around that it seems to be dark around the edges, particularly when I'm shooting indoors. Is this a side effect of the fisheye distortion or is there something wrong with my purchase?

    This particularly bad photo should give an idea...
    Attached Thumbnails Attached Thumbnails 379741405_3011ac0194.jpg  
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    Registered User c00lbeans's Avatar
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    thats called vignetting. wide angles get that a lot at low apertures. the barrel of the lens blocks some of the light around the outside area of the lenses(basicly the barrel becomes like an aperture that you cant widen) because of the super wide focal length.
    Last edited by c00lbeans; 02-16-2007 at 02:40 AM.

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    "sitting in the corner in Rick Roll timeout" chanwahyaoh's Avatar
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    are you using a filter on this lens?
    What aperature are you shooting at?

    My 10-22 doesn't vignette anywhere close to that.
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    Registered User dsel's Avatar
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    Quote Originally Posted by chanwahyaoh View Post
    are you using a filter on this lens?
    What aperature are you shooting at?

    My 10-22 doesn't vignette anywhere close to that.
    A couple things were going on there. We have little tiny spotlights in that room (3" low voltage 50 watt bulbs) that caused some of the effect in the top right corner. But I was shooting at F4 at a very slow speed, maybe 1/25th.
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    Registered User dsel's Avatar
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    Actually, here's my data...I see I had the EV down a bit.

    Camera: Canon EOS 20D
    Exposure: 0.077 sec (1/13)
    Aperture: f/4
    Focal Length: 14 mm
    ISO Speed: 800
    Exposure Bias: -2/3 EV
    Flash: Flash did not fire
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    Registered User DTR rex's Avatar
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    I know nothing about camera's, but I know that CoolBeans is usually correct when it comes to them.
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    Registered User TurbeauxREX's Avatar
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    dsel,

    Do you have any photos made in adequate lighting with the new lens? While I agree with c00lbeans on the vignetting, the example you posted is not optimal for trying to diagnose an equipment problem. Try shooting your subject again in better light and be sure you lock focus.

    Peace,

    Curtis

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    Registered User TurbeauxREX's Avatar
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    dsel,

    Were you using any filters on your lens? Lenshood? Read this for more info:

    http://www.prophotohome.com/forum/ca...etting-5d.html

    Curtis

  10. #9
    Registered User dsel's Avatar
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    Curtis , et al
    Thanks for the tips. I wasn't using any filters on the camera at the time, and I will be going out tomorrow if the weather holds up to take some pictures during the Chinese new year parade. Hopefully I will have some more telling shots from that.

    Dan
    Dead is Hard. Life is Much Easier. Be Adequite.
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