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Thread: Qn on Closeup filter

  1. #1
    Member/Tangshooter zh3ng's Avatar
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    May 2008
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    Tampines, Singapore
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    702

    Default Qn on Closeup filter

    Hi CS bros,

    I read through the closeup filter thread, but I don't know how to do the calculations.

    I currently have a sigma 70-300mm macro. the macro working distance from lens front to subject is 0.95m

    So if I get a Closeup+4 filter, what will be the new macro working distance? Which means how close can I go up to my subject?

    At the moment, with my lens front range at 0.95m, it's very hard to take closeup subjects to get a bigger macro view. So i'm thinking what closeup filter range i should get to go up to at least below 0.5m or to 0.25m.

    Thanks in advance.

  2. #2

    Default Re: Qn on Closeup filter

    +2.9 29cm
    +1.6 39cm
    +4.5 19cm
    +8 10cm

  3. #3
    Member
    Join Date
    Sep 2008
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    Singapore
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    361

    Default Re: Qn on Closeup filter

    Quote Originally Posted by windwaver View Post
    +2.9 29cm
    +1.6 39cm
    +4.5 19cm
    +8 10cm

    may i know how did u calculate this? is there a formula? thanks!

  4. #4

    Default Re: Qn on Closeup filter

    Sigma 70-300 can do 1:2 half lifesize, which magnifying power do I need to get 1:1?
    Is it +1 power?

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