"Chris Brogden " writes:
> On Wed, 23 May 2001, Bill D. Casselberry wrote:
> > 1:2 & 1:1 are easy calculations --
> > 1:1 is achieved w/ extension tubing ~= to the focal length
> Does the close-focusing ability of the lens affect this?
> That is, would I
> get the same magnification using
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 a
Chris, on extension tubes, wrote:
> Does the close-focusing ability of the lens affect this? That is, would I
> get the same magnification using a 50mm extension tube on a 100mm macro as
> I would on a regular 100mm? If not, then differences in close-focusing
> ability must affect the magnifi
probably
> want at a minimum to get meter and aperture coupling if possible - this
> makes everything easier and preserves TTL metering.
>
> Paul M. Provencher
> (ppro)
>
>
> -Original Message-
> From: Peifer, William [OCDUS] [mailto:[EMAIL PROTECTED]]
> Sent: We
"Paul Jones" writes:
> I am looking at buying some k-mount extension tubes. I am
> wondering if there
> is any difference in the performance of different brands? As
> if there like
> the screw mount ones i have seen then there is no glass in the tube.
I don't know if there are difference
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