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Thread: How to test if your copy of lens is good?

  1. #1

    Default How to test if your copy of lens is good?

    Hi,

    Just want to know from the experts what are the things you check and how do you check it,
    when buying a lens. Can you please teach me how to accurately check the sharpness of a certain lens.

  2. #2
    Senior Member
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    Default Re: How to test if your copy of lens is good?

    Never check. Buy, test it, look for the result. If ok, that's a good copy.

    Regards,
    Arto.

  3. #3

    Default Re: How to test if your copy of lens is good?

    Try the lens by taking a few shots, and see whether you are satisfied with the sharpness of the picture and the contrast of it. If you are satisfied with it, then buy it.

  4. #4

    Default Re: How to test if your copy of lens is good?

    Ask salesperson to take out all the same lenses and you shoot and compare so there is a reference ...lol

  5. #5
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    Default Re: How to test if your copy of lens is good?

    Quote Originally Posted by tamiya_model View Post
    Ask salesperson to take out all the same lenses and you shoot and compare so there is a reference ...lol
    Don't do that .

    Regards,
    Arto.

  6. #6
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    Default Re: How to test if your copy of lens is good?

    Quote Originally Posted by tamiya_model View Post
    Ask salesperson to take out all the same lenses and you shoot and compare so there is a reference ...lol


    Use a black marker and mark a "X" on those u tested not ok incase u lost track.
    陳綺貞 2010 [夏季練習曲] 巡迴演唱會 Cheer Concert 13 Nov 2010 MAX Pavilion@Singapore Expo

  7. #7

    Default Re: How to test if your copy of lens is good?

    actually...for slrs....wats the point.... if u are shooting MF however, metinks thats a different story.....

  8. #8

    Default Re: How to test if your copy of lens is good?

    That's a fair qn and I'm a little surprised there are no suggestions towards a straight answer yet.

    There's no difference buying first hand or 2nd hand. Basic things to look out for include;

    - Lens condition
    Electrical contacts, diaphragm scratches, zoom ring smoothness, glass coat evenness etc...

    - Image quality
    Do your homework on the lens before buying. Note the peculiar weaknesses to look out for. Eg. Bad copy Sigma lenses are sharper one side than the other. Some have creeping problem when they should not

    Of course, all these depends on how much time and support you have at the shop. Not many will give you the luxury of testing it out with your laptop to view on the final image output. Use of PDAs or Media Viewers may be easier.

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