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Thread: is this sharp or soft?

  1. #1
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    Default is this sharp or soft?

    just bought a sigma 17-70
    this is the central crop 100% no edit
    is this consider sharp or soft?


  2. #2

    Default Re: is this sharp or soft?

    Quote Originally Posted by htthach
    just bought a sigma 17-70
    this is the central crop 100% no edit
    is this consider sharp or soft?

    http://img171.imageshack.us/img171/1491/test2fx.jpg
    100% crop of what kind of resolution? If the total number of pixel is above 8MP, then it's considered quite sharp..

  3. #3
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    Default Re: is this sharp or soft?

    i used 10D, format is large fine
    so it is 6mpx only

  4. #4
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    Default Re: is this sharp or soft?

    I find not too bad, but I can't say conclusively it's sharp.

    Have a look against my 18-50 F2.8, which I consider a sharp lens, almost at the 50mm end. So that you can compare and judge for yourself to see if your lens is sharp. Yes I know, it's a badly taken photo. but.. ah well..
    I can't find any central focus photos, but here's a side crop. Absolutely no editing done to either image.. Original posted just to show you how side the crop was. You can make your own conclusions ya.
    Side is supposed to be softer then center right? Note though, different lighting, different handheld speeds may affect sharpness..



    Original Photo..
    Last edited by unseen; 28th April 2006 at 05:41 AM.

  5. #5

    Default Re: is this sharp or soft?

    Quote Originally Posted by htthach
    i used 10D, format is large fine
    so it is 6mpx only
    Then I think it's ok. If you stick with 6mp, it is ok, the lens seems to be able to resolve beyond that, but how far? we can't tell unless you use a higher pixel count. But judging from the image, I think 8 to 10mp should still be acceptable.

  6. #6
    Senior Member jnet6's Avatar
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    Default Re: is this sharp or soft?

    what F/stop are you using...
    in terms of sharp, need to depends on f-stop(DOF), sharpness setting in yr cam and MP count of yr cam.
    next is the lens...

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