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Thread: How to check for sharpness when getting lens?

  1. #1

    Default How to check for sharpness when getting lens?

    Hi, I was reading through some threads here on what to check for when getting 2nd hand lenses. And read that some people say that the same model of lens from the same brand can have different degree of sharpness depending on the copy you landed with. May I know how does one go about checking for sharpness to ensure that one has the best copy? I'm sorry if there's a similar question being asked before, maybe you could help post the thread reference here so that I can go read it up. Thanks.
    If Not Now When? If Not Now Why?

  2. #2
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    Default Re: How to check for sharpness when getting lens?

    Quote Originally Posted by alant View Post
    Hi, I was reading through some threads here on what to check for when getting 2nd hand lenses. And read that some people say that the same model of lens from the same brand can have different degree of sharpness depending on the copy you landed with. May I know how does one go about checking for sharpness to ensure that one has the best copy? I'm sorry if there's a similar question being asked before, maybe you could help post the thread reference here so that I can go read it up. Thanks.
    When you buy a second hand lens, it is a MUST that you bring a body to try on the spot. It will be good if its a DSLR as you can see the output of the lens immediately

    The term "sharp" is actually very subjective. I don't know if you have came across people commenting that lens too sharp (causing pictures to be very fake), and also some people find certain lens that is too soft but in actual fact is very natural

  3. #3

    Default Re: How to check for sharpness when getting lens?

    Wow sounds tough...But I also read that some say bring camera not good enough as can't see overall, so bring notebook to test? Is that too extreme? Then again there's possibility of the lens being sharp but my hand just at that moment not steady enough so how? Thanks for the inputs Shawn.
    If Not Now When? If Not Now Why?

  4. #4

    Default Re: How to check for sharpness when getting lens?

    Bring tripod also Not to mention cable release / timer. (Joking, but you can take seriously if you want)

    Or if you're buying from a shop like Cathay Photo, you can just borrow one of their display tripods to use.
    Last edited by AlteredVision; 10th April 2008 at 11:51 PM.

  5. #5

    Default Re: How to check for sharpness when getting lens?

    I'm not into such extremes. The thing that confused me is that is it true different copies of the same lens from the same brand, does the sharpness really differ? And how to check?
    If Not Now When? If Not Now Why?

  6. #6

    Default Re: How to check for sharpness when getting lens?

    I think TS is talking about prime lens?

  7. #7
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    Default Re: How to check for sharpness when getting lens?

    a few ways to ascertain lens quality is to check for edge distortion or the quality of bokeh (the off-focused blur zones) in the pictures, or on the lens iteself, determining the number of lens elements within (the more the merrier), if the elements are spherical and multicoated etc etc..

    if you wanna go full technical on the checking, check out this site: http://www.bobatkins.com/photography...sharpness.html

  8. #8

    Default Re: How to check for sharpness when getting lens?

    Quote Originally Posted by alant View Post
    Hi, I was reading through some threads here on what to check for when getting 2nd hand lenses. And read that some people say that the same model of lens from the same brand can have different degree of sharpness depending on the copy you landed with. May I know how does one go about checking for sharpness to ensure that one has the best copy? I'm sorry if there's a similar question being asked before, maybe you could help post the thread reference here so that I can go read it up. Thanks.
    Bookmarked this thread from 2 years ago. See the second post: http://www.clubsnap.com/forums/showthread.php?t=244817

    Hope it helps

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