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Re: [OM] Extension tubes?

Subject: Re: [OM] Extension tubes?
From: "Hans van Veluwen" <mail@xxxxxxxxxxxxxxxx>
Date: Wed, 9 Jun 1999 11:48:03 +0200
: 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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