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Thread: tele-foto+close-up filter?

  1. #1
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    Default tele-foto+close-up filter?

    i tried to use a +3 diopter hoya close-up filter on a sigma 70-300 APO
    but the thing is, it cannot focus or have sharp focus on the object...
    espercially on the tele-end.
    or is there something wrong with my lens?


  2. #2
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    Default Re: tele-foto+close-up filter?

    You should know that with the closeup filter you will no longer be able to focus at infinity. yr focusing distances had beed changed (reduced)

  3. #3
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    Default Re: tele-foto+close-up filter?

    This is cause by the fact that Hoya Closeup doesn't offer good IQ and Sigma 70-300 is soft at 300mm...

  4. #4
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    Default Re: tele-foto+close-up filter?

    but strange thing is it works sharp on my 18-55mm kit lens?

  5. #5

    Default Re: tele-foto+close-up filter?

    tripod?

  6. #6

    Default Re: tele-foto+close-up filter?

    Did u focus at around 33 cm? Need to use 1000mm / (diopter) formula to get it right. In your case, 1000/3 = 333mm or 33.3 cm.

  7. #7
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    Default Re: tele-foto+close-up filter?

    Quote Originally Posted by wong1979 View Post
    Did u focus at around 33 cm? Need to use 1000mm / (diopter) formula to get it right. In your case, 1000/3 = 333mm or 33.3 cm.
    Additional info: That's 33.3mm is when the lens' distance set at infinity. No matter of focal length of the lens.

    Regards,
    Arto.

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