: I've noted (certain others have also) that the Oly tubes are 7mm, 14mm,
and
: 25mm while the Vivitar are 12mm, 20mm and 36mm. I also know the tubes can
: be stacked in various combinations for additional lengths.
:
: Is there a rationale for the various lengths? Are there certain lenses in
: combination with one or more tubes that will give specific magnification?
: If I understand it correctly, a 50mm lens with the Oly 25mm tube will give
: 1:2 if the lens is focused to infinity. Not that a specific magnification
: is important to me . . . but curious why Oly would make one set of sizes
: and Vivitar another.
As usual, check
http://www.veluwen.demon.nl/om-sif/macrophotogroup/auto
0.000000e+00xtension%20tubes.
htm
I also included the Table Of Close-Up Ranges that shows the magnification
ranges for the various combinations.
Hnz
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