As others have said, the 25. The main reason for the other two is to provide
all the combinations needed so that a non-macro 50mm can give any
magnification between 0 (at infinity) and 1X (lifesize).
That said, there might be interesting uses for them. Doing closeup/macro
with a 21/3.5? Serious lack of working distance...
The most useful combination is the 25 with a 50mm macro. You get 0-1/2X
without the tube and 1/2X-1X with it. Simple.
Andrew
> Date: Wed, 19 Feb 2003 22:22:34 -1000
> From: "danrich" <danrich@xxxxxxxxxx>
> Subject:
>
> Extension Tubes 7/14/25
> If you could only have one, what one would you pick?
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