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Thread: Macro lenses: Field of view, MFD, Aperture.

  1. #1

    Default Macro lenses: Field of view, MFD, Aperture.

    Hi All,

    Feeling to get myself a macro lens. Will be my 1st try. And I would like to double up this lens as a portrait lens.

    Would like to ask for your kind clarification about some of the things related to macro lens...

    1. field of view (FOV)
    For a macro lens of 100mm, its field of view (how 'wide / narrow') will be identical to any other 100mm lenses? Just FOV, regardless of MFD. I want to use other lens to justify which focal length i will like.

    2. Aperture
    I read from somewhere else, when the distance to the subject getting closer until the minimum focus distance, the maximum aperture of the lens will be different when the lens is far away from a subject?

    If a 100mm f2.8 macro lens, at it's MFD, the max aperture is actually >f2.8 (say f3.5, f4...)?

    Thanks for your kind input
    Last edited by Shen siung; 24th May 2010 at 03:03 PM.

  2. #2

    Default Re: Macro lenses: Field of view, MFD, Aperture.

    1) If two lenses have an identical focal length, their FOV will be the same.

    2) From a certain point/focusing distance, the closer a lens is focused, or the further an objective is moved away from a focal plane, the more light is lost.

  3. #3
    Senior Member Numnumball's Avatar
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    Default Re: Macro lenses: Field of view, MFD, Aperture.

    Quote Originally Posted by Shen siung View Post
    Hi All,

    Feeling to get myself a macro lens. Will be my 1st try. And I would like to double up this lens as a portrait lens.

    Would like to ask for your kind clarification about some of the things related to macro lens...

    1. field of view (FOV)
    For a macro lens of 100mm, its field of view (how 'wide / narrow') will be identical to any other 100mm lenses? Just FOV, regardless of MFD. I want to use other lens to justify which focal length i will like.

    2. Aperture
    I read from somewhere else, when the distance to the subject getting closer until the minimum focus distance, the maximum aperture of the lens will be different when the lens is far away from a subject?

    If a 100mm f2.8 macro lens, at it's MFD, the max aperture is actually <f2.8?

    Thanks for your kind input
    1. FOV remains reagrdless so long its 100mm

    2. should be greater than >2.8

    Some find macro lens (including me) to be too unflattering (sharp and too constrasty) for portraiture work :0
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  4. #4

    Default Re: Macro lenses: Field of view, MFD, Aperture.

    Thanks Numnumball and Dream Merchant

    Yes I mean smaller aperture, or greater than 2.8 (f3.5,f4....) , he he. Error.

    So that means, for all macro lens, when it is at MFD, the aperture might be only maximum at, say f4? Thanks

  5. #5

    Default Re: Macro lenses: Field of view, MFD, Aperture.

    Quote Originally Posted by Shen siung View Post
    Thanks Numnumball and Dream Merchant

    Yes I mean smaller aperture, or greater than 2.8 (f3.5,f4....) , he he. Error.

    So that means, for all macro lens, when it is at MFD, the aperture might be only maximum at, say f4? Thanks
    The size of the aperture doesn't change when its at the minimum focus distant or at infinity. The only thing about macro lens is that you will likely set it above f/8 due to the thin dof. Basically the aperture doesn't change like that of a zoom lens.

  6. #6
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    Default Re: Macro lenses: Field of view, MFD, Aperture.

    http://www.clubsnap.com/forums/showp...01&postcount=8

    Effective aperture does change on some macro lens, just that some cameras reflect the change on the lcd, others don't. I know canon doesn't and nikon does.

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