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Thread: How to prevent vignetting or diffraction problem

  1. #1

    Default How to prevent vignetting or diffraction problem

    Hi, i am using a 550D with 17-50mm tamron lens. I realise that my picture when enlarge , they don't seem sharp. What can i do to prevent it?

  2. #2

    Default Re: How to prevent vignetting or diffraction problem

    enlarged as in view at 100% or more?
    on your camera's LCD or computer LCD?

    to prevent vignetting caused by the characteristic of the lens, stop down your aperture (different lens will have different apertures when vignetting improves)
    to prevent diffraction, dont shoot like very small apertures like f18-f22 (different lens will have different aperatures where diffraction kicks in)

  3. #3

    Default Re: How to prevent vignetting or diffraction problem

    on my camera lcd and computer too.. is 150% or more.. I tried using f8, but still can slight blurish on the edge..

  4. #4

    Default Re: How to prevent vignetting or diffraction problem

    Quote Originally Posted by kianisme View Post
    on my camera lcd and computer too.. is 150% or more.. I tried using f8, but still can slight blurish on the edge..
    Aiyo. Anything more than 100%, your computer is interpolating and guessing where the edges are. Don't go above 100%. Or better yet, stop pixel peeping.
    Alpha

  5. #5

    Default Re: How to prevent vignetting or diffraction problem

    yup,
    actually, even with the sharpest lens and a good fullframe sensor, at 100% it won't be razor sharp.

  6. #6

    Default Re: How to prevent vignetting or diffraction problem

    oh i seee.. cause sometimes just want to check whether the face is sharp when taking model...but realise when zoom in is blur..

  7. #7

    Default Re: How to prevent vignetting or diffraction problem

    actually if you don't print, and only view on your computer / share online.
    the image is sharp when viewed at 1024 resolution would nomrally be sufficient.

  8. #8

    Default Re: How to prevent vignetting or diffraction problem

    but what if i need it for print? Lol

  9. #9
    Moderator catchlights's Avatar
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    Default Re: How to prevent vignetting or diffraction problem

    check sharpness you need to see your image at 100% zoom factor, larger than this is not accurate.
    for doing touch up, you can go 200% or more for some details work.

    for printing, if your original image is sharp, any paper size smaller then your image dimension will be fine.
    larger print usually don't see at close distance.
    Shoot to Live, Live to Shoot
    www.benjaminloo.com | iStock portfolio

  10. #10
    Member enzeru21's Avatar
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    Default Re: How to prevent vignetting or diffraction problem

    pixel peepers can't find satisfaction...
    enzeru21 Canon 500D |Tamron17-50mm f/2.8| Sigma30mm f/1.4 | 580EX II
    mylightedreams

  11. #11

    Default Re: How to prevent vignetting or diffraction problem

    ohhh.. thanks guys!!! now i understand... =))

  12. #12
    Moderator daredevil123's Avatar
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    Default Re: How to prevent vignetting or diffraction problem

    Quote Originally Posted by kianisme View Post
    but what if i need it for print? Lol
    Then die lor.

    You need to get a medium format camera..
    I recommend the Hasselblad H4D-60.

  13. #13

    Default Re: How to prevent vignetting or diffraction problem

    Quote Originally Posted by daredevil123 View Post
    Then die lor.

    You need to get a medium format camera..
    I recommend the Hasselblad H4D-60.

  14. #14
    Moderator Octarine's Avatar
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    Default Re: How to prevent vignetting or diffraction problem

    Another point: focus accuracy. If your camera focus is not spot on then this will also contribute to soft images. Have you verified this point?
    EOS

  15. #15

    Default Re: How to prevent vignetting or diffraction problem

    yea that i know.. been trying alrdy..

    oh well.. NO CASH! hahhaha...

  16. #16
    Moderator Octarine's Avatar
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    Default Re: How to prevent vignetting or diffraction problem

    Quote Originally Posted by kianisme View Post
    oh well.. NO CASH! hahhaha...
    Download focus test charts, take a tripod (or borrow one), read the instructions and follow thoroughly. It only costs time, not money.
    EOS

  17. #17

    Default Re: How to prevent vignetting or diffraction problem

    Get a camera with peripheral illumination correction.

    http://www.usa.canon.com/dlc/control...articleID=2027

  18. #18

    Default Re: How to prevent vignetting or diffraction problem

    pardon me asking... vignetting is the one with "black shadow" at the sides of the pic right?

    If so, i personally like that "black shadow" sometimes becoz basically it gives mood to some of the pictures. Why are people trying to avoid it at all costs?

  19. #19

    Default Re: How to prevent vignetting or diffraction problem

    Quote Originally Posted by virtualme78 View Post
    pardon me asking... vignetting is the one with "black shadow" at the sides of the pic right?

    If so, i personally like that "black shadow" sometimes becoz basically it gives mood to some of the pictures. Why are people trying to avoid it at all costs?
    Because some people believe that perfect edge to edge exposure and sharpness are what make a picture "good". This pixel-peeping mentality is common here in SG.

    Sadly, the artistic part of photography gets ignored too often.
    Alpha

  20. #20
    Moderator catchlights's Avatar
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    Default Re: How to prevent vignetting or diffraction problem

    Quote Originally Posted by virtualme78 View Post
    pardon me asking... vignetting is the one with "black shadow" at the sides of the pic right?

    If so, i personally like that "black shadow" sometimes becoz basically it gives mood to some of the pictures. Why are people trying to avoid it at all costs?
    technically speaking, this is the flaws of the lens design, or mistakes during creating the images, we should avoid it.
    some time, we can use it to enhance our photos, however, not all images work well with vignetting.
    Shoot to Live, Live to Shoot
    www.benjaminloo.com | iStock portfolio

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