On Wed, 23 May 2001, Bill D. Casselberry wrote:
> Your 100mm macro most likely has ~50mm of "extra" (macro)
> extension built into it's barrel to give the more common
> 1:2 capability or ~100mm if it is a 1:1 capable one. The old
> 100mm BellowsTakumar had no helicoid at all - it was all
> done via the bellows.
Ah, that makes sense. So my 100/4 macro (1:2) will go to 1:1 with 50mm of
extension tubes, while the same tube will only take a regular 100mm lens
to 1:2 (roughly). Thanks!
chris
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