Howard Lester wrote:
>
> Oh yeah - extension tubes. I forgot about those things. ;-) Extension
> tubes serve the same purpose as a bellows, so it IS effectively the same
> thing: they/it push your lens further from the film plane than it would
be
> if mounted directly to the body. The greater the extension, the more you
> have to compensate for light loss.
Okay ... I get what you mean.
As it happens, the extension tubes I have include linkages
that connect the aperture detector (?) on/in the body
to the aperture adjustment on the lens.
It is in that sense that I said that they are a different case.
At least, that's what I *think* I meant.
Mostly I'm trying to extract the fundamentals from what is being said,
so that, even if I don't need them now,
I'll have them tucked away for future use.
Thanks again for the clarifications.
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