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  1. #1
    Join Date
    Nov 2004
    Posts
    60

    Macro lens: "extending" versus "internal" focusing

    I'm a bit of a novice when it comes to DSLR photography terminology-wise, so pardon the awkward use of language.

    I have a Nikon D5000 with a Nikkor 105 mm macro lens which does all of its focusing internally (i.e. the barrel doesn't extend).

    I just got a Sony a55 with a Sigma EX 105 mm macro lens that extends like a zoom lens when in use, which I find very odd having been used to the Nikkor.

    My questions:

    [1] is there a Macro lens for the Sony similar to the Nikkor in terms of this behavior.
    [2] is there any advantage of one type of lens architecture over the other?

    Thanks for your thoughts!

  2. #2
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    The only constant length Macros I know of are...
    Tamron SP AF 60 F2 Di II LD
    Tamron - SP AF 180 F3.5 Di LD IF
    Minolta - AF 200 F4 Macro APO G (only available second hand but rare as hens teeth)

    Any advantage?
    No affect on quality!
    May not scare away small creatures when using AF (but the noise can do that anyway).
    I use MF so it's not an issue for me.
    Last edited by Peekayoh; 10-20-2010 at 04:07 AM. Reason: afterthought

  3. #3
    Join Date
    Jan 2008
    Location
    Terra Australis Incognita
    Posts
    3,877
    risk of pollen and other dust being induced past the seals.
    Extending lenses feel cheap to the user and look it to the public by comparison.
    D800, D300, D90, 24-70 f2.8, 70-200VR f2.8, 300 F4, 105 micro, 16-85VR, 50mm 1.8, Tammy 90 macro, 70-300VR, SB900, 2xSB600, MB-D10, 055XPROB 322RC2. New computers to run photoshop faster. C&C always appreciated. PhotoGallery
    Pressing the shutter is the start of the process - Joe McNally ... Buying the body is the start of the process - Dread Pirate

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