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Thread: Sharpness

  1. #1
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    Default Sharpness

    Hi CSer..

    i jus wanna ask u guy what is than call sharp to u??i jus don understand what does sharp means to u guys>.< oso what do ppl means when they say zoom in to check for sharpness?what do they look out for?? how to know weather its sharp or not??Pls help me>.<Don scold me-.-.. thanks in advance^^




    Regard,
    NormanTan
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

  2. #2

    Default Re: Sharpness

    Errr... Aside from the obvious "read a dictionary, look up the word sharp" the easiest answer would be when you can clearly see all the details of the subject without any blur.
    Alpha

  3. #3
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    Default Re: Sharpness

    So how would a lens that is not sharp be like when u zoom in? Blur??
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

  4. #4
    Moderator catchlights's Avatar
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    Default Re: Sharpness

    use your camera,
    mount any lens on it,
    mount your camera on a tripod,
    aim at a subject with fine details
    focus and lock it
    I'm sure you know how to get correct exposure
    shoot at f8

    load the image into computer
    open any image viewer software
    zoom in 100%
    you can see the clear definition of the fine details

    this is sharpness...

    once you see what is sharp... anything unlike this is call NOT SHARP
    Shoot to Live, Live to Shoot
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  5. #5

    Default Re: Sharpness

    Quote Originally Posted by NormanTan View Post
    So how would a lens that is not sharp be like when u zoom in? Blur??
    You can put it that way but anything that is blown up 200% is considered pixel peeping. Besides, the perception of sharpness is different for different people.

  6. #6
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    Default Re: Sharpness

    Quote Originally Posted by catchlights View Post
    use your camera,
    mount any lens on it,
    mount your camera on a tripod,
    aim at a subject with fine details
    focus and lock it
    I'm sure you know how to get correct exposure
    shoot at f8

    load the image into computer
    open any image viewer software
    zoom in 100%
    you can see the clear definition of the fine details

    this is sharpness...

    once you see what is sharp... anything unlike this is call NOT SHARP

    Erm y shoot at f/8 eh?
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

  7. #7
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    Default Re: Sharpness

    Quote Originally Posted by NormanTan View Post
    So how would a lens that is not sharp be like when u zoom in? Blur??
    soft.
    cameras are not made of tofu

  8. #8
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    Default Re: Sharpness

    Quote Originally Posted by Fotophilic View Post
    soft.
    soft? what do u mean by soft?? how does it/ will it look like?
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

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    Default Re: Sharpness

    Quote Originally Posted by NormanTan View Post
    soft? what do u mean by soft?? how does it/ will it look like?
    http://www.kenrockwell.com/nikon/50-.../sharpness.htm

    I would like u to see under f/2, compare 1.8 AF at f/2 with the others. That is roughly wat i meant by soft.
    cameras are not made of tofu

  10. #10
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    Default Re: Sharpness

    Quote Originally Posted by NormanTan View Post
    Erm y shoot at f/8 eh?
    lens usually performs at it's best when stopped down to something away from it's maximum aperture..

    and at f/8.. you get reasonably deep depth of field which increases perceived sharpness too..

    correct me if i'm wrong..

  11. #11
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    Default Re: Sharpness

    sorry... but after looking at the kenrockwell.com webby, i still can't see the different=.= OMG!!
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

  12. #12
    Moderator catchlights's Avatar
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    Default Re: Sharpness

    it is so clear that you have not taken a sharp focus photo yet, that how you does not know how is a sharp focus photo looks like.

    why don't just do a test and see it yourself like what I have suggested earlier?
    Shoot to Live, Live to Shoot
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  13. #13
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    Default Re: Sharpness

    Quote Originally Posted by catchlights View Post
    it is so clear that you have not taken a sharp focus photo yet, that how you does not know how is a sharp focus photo looks like.

    why don't just do a test and see it yourself like what I have suggested earlier?



    this is crop from the above picture..i zoom this picture to 100% and crop it..is that the right way to crop it?? and is it sharp??


    i took it at f8..using a 85mm f1.8
    Last edited by NormanTan; 20th October 2008 at 09:48 PM.
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

  14. #14
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    Default Re: Sharpness

    Quote Originally Posted by NormanTan View Post
    sorry... but after looking at the kenrockwell.com webby, i still can't see the different=.= OMG!!
    u surprised me. i tot the one at the F2 was pretty obvious already. Are u sure u can't see a diff? Are u looking at the picture i told u? If u really can't see a diff and was seeing the correct one, perhaps its a blessing in disguise for u.

    Why don't u try performing the same test u did for ur 85mm f1.8 on ur 70-210mm f4-5.6. Rem, same focal length, same fstop, iso, etc. Everything constant except for lens. Try several f-stops and compare the 2 (e.g. 4.5, 5.6, 8). Perhaps the best way to let u see what is sharp and not sharp is to let u compare pictures. By right (no gurantee thou), ur 85 F1.8 should be sharper.
    cameras are not made of tofu

  15. #15
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    Default Re: Sharpness




    <<---- this is 100%zoom and crop... using my 70-210 at f/8 and 85mm which sharper??
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

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    Default Re: Sharpness





    <<<---this is done with the 85mm lens f/8 i feel that this is better than the previous 1
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

  17. #17
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    Default Re: Sharpness

    y did u feel that the 85mm is better?

    most lenses performs well ("sharp") at ard F8.
    cameras are not made of tofu

  18. #18
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    Default Re: Sharpness

    lol... so both the lens are sharp copy?? or which do u think is better?
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

  19. #19

    Default Re: Sharpness

    Quote Originally Posted by NormanTan View Post



    this is crop from the above picture..i zoom this picture to 100% and crop it..is that the right way to crop it?? and is it sharp??


    i took it at f8..using a 85mm f1.8
    I think your 85mm 1/1.8 got alignment / focusing issue. This lens should be much sharper than this.

  20. #20
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    Default Re: Sharpness

    Quote Originally Posted by kingcrab View Post
    I think your 85mm 1/1.8 got alignment / focusing issue. This lens should be much sharper than this.
    what do u mean by alignment and focusing issue can u elaborate more on it??
    Nikon D300|MB-D10|Nikon F2|Nikon 24-70mm f2.8G ED|Nikon 70-210mm f/4-5.6 AF-D|SB-80DX|Next:70-200mm

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