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Thread: Close up filter on zoom lens

  1. #1

    Default Close up filter on zoom lens

    Hi Guys,

    Trying to use a Hoya +4 filter (52mm with a 58 -> 52 step-down ring) on a Sigma 70-300 Super II Macro lens on a Canon 350D

    However, i always have problems autofocusing. Image in viewfinder always appear blur (i.e. very soft on the edges.) before i take the shot, thus the camera cannot autofocus based on that image. I understand i must set the smallest aperture available, thus i'll use the depth-of-view preview button and manual focus with it.

    Any idea how to use auto-focusing in such a scenario?

    Thanks.

  2. #2
    Member
    Join Date
    Nov 2004
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    Singapore
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    1,502

    Default

    I using the Canon 75-300mm. Zoom to 300mm a close up +4 is too close.
    Try the close up +2 or max +3...

    For MF walk to the correct distance & then turn the focus ring until you see a sharp image...
    TO SEE, TO FEEL, TO PHOTOGRAPH.

  3. #3

    Default

    Hi Goldenstars,

    Thanks a lot! I'll try it out to see how it goes (I realised that a +4 allows me only very very little distance to play with to get the focusing sharp).

    cheers,

  4. #4
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    Join Date
    Apr 2005
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    Sembawang, Singapore
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    80

    Default

    Quote Originally Posted by expositer
    Hi Goldenstars,

    Thanks a lot! I'll try it out to see how it goes (I realised that a +4 allows me only very very little distance to play with to get the focusing sharp).

    cheers,
    That is how a diopter works, be it +3 or +2, the focusing distance become very limited. Their difference being, +4 enables you to focus closer than a +3.

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