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Thread: Wider lens for keystone correction?

  1. #1

    Default Wider lens for keystone correction?

    Was correcting firework shots in CS5 when I realized it results in significant loss from the correction and cropping to remove the keystone distortion. The first impulse was to think of getting an even wider lens (10mm to 8mm on 1.6x crop). I believe going even wider would create even more distortion which means more cropping when correcting? The question is thus, does the two cancel out or can I retain more of the picture (using a shorter focal length) after keystone correction?
    Last edited by CamInit; 20th September 2010 at 10:19 AM.

  2. #2
    Senior Member Kit's Avatar
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    Default Re: Wider lens for keystone correction?

    You get keystone effect when your camera and lense is not aligned to the object you are photograhing. To some extend, wide angle lenses do help because the wider angle of view gives you better chance to align your setup to your objects. However, there is a limit of what they can do.

  3. #3
    Senior Member giantcanopy's Avatar
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    Default Re: Wider lens for keystone correction?

    Kit has explained the issue of falling verticals.

    With a wider lens , u have a better chance of getting the sensor aligned parallel to that of the verticals in your scene and yet include much of the action because of wider coverage. But comes with a price of doing crop ( i suppose u might not want too much of the lower half below the horizon ).

    ryan

  4. #4

    Default Re: Wider lens for keystone correction?

    For the ultimate in quality, get something like a GSX680 or a view camera.

    http://www.luminous-landscape.com/re...gx680iii.shtml

    http://en.wikipedia.org/wiki/View_camera

    Failing which, get a Tilt-Shift lens and learn how to stitch.

  5. #5
    Senior Member giantcanopy's Avatar
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    Default Re: Wider lens for keystone correction?

    Quote Originally Posted by Dream Merchant View Post

    Failing which, get a Tilt-Shift lens and learn how to stitch.
    Fireworks photography abit hard to stitch though
    but talking about keystone effects, t/s and fireworks, here is one that i recently did with a DIY 50mm shift lens to straighten up the building
    http://farm5.static.flickr.com/4090/...24ccf4fa_o.jpg

    ryan

  6. #6
    Member dingaroo's Avatar
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    Default Re: Wider lens for keystone correction?

    Quote Originally Posted by Dream Merchant View Post
    For the ultimate in quality, get something like a GSX680 or a view camera.

    http://www.luminous-landscape.com/re...gx680iii.shtml

    http://en.wikipedia.org/wiki/View_camera

    Failing which, get a Tilt-Shift lens and learn how to stitch.
    And carry a tripod weighing 25kg like you? Hahahaha!

    Anyway, was great to see you again last Saturday, though could have been in slightly better location.

    TS: Maybe next time try to orientate your camera to portrait orientation. Make sure you put on a bubble leveler to ensure you are horizontally and vertically level to avoid keystone effects.

    Or like DM recommended, a Tilt-Shift lens may help solve the problem, but it will cost a lot more than an ultra wide angle. And to operate it is not easy. U can google it.

    Cheers.
    A picture a day keeps the blues away!

  7. #7

    Default Re: Wider lens for keystone correction?

    ok, thanks for the replies. I suppose 8mm also wouldn't resolve the problem completely for my case where the keystone distortion is quite extreme. The fireworks were almost overhead and I was hoping to include in the horizon for composition. Now it occurred to me wondering how well would the Canon 8-15mm do after de-fishing?

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