A&P Macro lens vs. Extension Tube

Discussion in 'Lifestyle' started by mobbarley, Nov 8, 2006.

  1. mobbarley

    mobbarley Active Member

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    Just got my hands on an EF25 II extension tube and it is fun :)

    Finding sample pictures taken with the EF25 II is quite difficult, and as flower and bug pics are one of the most common reasons for noobs to 'go pro' by buying a DSLR, I have compared using the extension tube to a macro lens.

    Here are the same photos taken with different lenses for comparison.

    EF 100 F2.8 Macro
    Set to 1:1, Distance from lens 14cm.
    [​IMG]

    100% crop
    [​IMG]


    EF 100 F2.8 Macro + EF25 II
    Set to 1:1, Distance from lens 10cm.
    [​IMG]

    100% crop

    [​IMG]


    EF 50 F1.8
    Focused as close as possible, Distance from lens 35cm.

    [​IMG]

    100% crop

    [​IMG]


    EF 50 F1.8 + EF25 II
    Focused as close as possible, Distance from lens 8cm.


    [​IMG]

    100% crop

    [​IMG]



    Observations:
    Photos taken on 1.6 crop camera.

    The EF50 1.8 + EF25 II does a pretty damn good job, however the EF100 Macro is a much better purchase if you have the funds. The macro lens is much easier to work with, puts more distance between you and your subject and can still focus to inf.

    Extension tubes KILL your infinite focus... Down to maybe 1'.

    The effect of the extension tube is much more pronounced on the 50mm than the 100mm, this is probably due to the design of the rear focusing elements of the lens rather than the focal length.

    Extension tubes reduce your maximum aperture. My sample photos dont really show this as my flash was set to ETTL.

    Circuit boards are lacquered and it is hard to get a sharp picture of them :o
     
    Last edited: Nov 8, 2006
  2. Cobber

    Cobber Wanna touch my bunny hole?

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    you should be using the same size extension tube as you focal length.
    50mm lens = 50mm ext tube
     
  3. brasheye

    brasheye Rotary Crew

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    Did you get the auto ones or the ones without electrical contacts?

    Im looking at a set for my 50mm too, around $150AU seems the going rate for some auto kenko tubes.

    Good stuff :cool:
     
  4. mobbarley

    mobbarley Active Member

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    It was the canon 25mm tube, has electrical contacts. Unlike the teleconverters it seems to do nothing to metering etc. (which is fine)
     
  5. mobbarley

    mobbarley Active Member

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    Why? to double magnification?

    I searched for a while to find what difference the tube would make to an ef100 macro but couldnt find any examples.. so trying it out is fun :hsd:
     

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