>
> ----- Original Message -----
> From: "Paul Farrar" <farrar@xxxxxxxxxxxx>
> To: <olympus@xxxxxxxxxxxxxxx>
> Sent: Tuesday, December 11, 2001 1:49 PM
> Subject: Re: [OM] Quick question about bellows macro lenses
>
> > > the 80/4 auto macro and its manual variant
> > Manual yes, but very difficult. You have to get an extension of
> > precisely the right length, and then you couldn't change the focus
> > since it doesn't have the focus adjustment helical that the auto does.
> > Auto, no, I believe.
>
> Couldn't you use both of the 80mm on the telescoping extension tube to focus
> to infinity? Unless even at the shortest setting (65mm? sorry no access to
> the esif right now) it's too much extension. Then you could use the
> adjustment of the tube to focus right?
>
I believe the shortest setting of both the bellows and the TAT are too
long for the 80mm to focus at infinity. The 80mm is a double Gauss design,
so its rear nodal point is near the middle of the lens, so you would need
about 20mm or so of extension. That definitely eliminates the TAT. I have,
as an experiment, combined the 80mm with the Vivitar macro focusing
teleconverter, which allows you to get variable small extensions. I
got a 160mm f/8 that would focus to infinity, but that's not really
a practical combo. I was just playing. If you want infinity focus and
a short telephoto, get a 90 or 100macro, either the Zuiko 90/2, or one of
the many excellent 3rd party ones, like the Tamron 90/2.5. The 100/2
and 65-200 come close to macro also.
By the way, for macro fans, Keh is listing the legendary and hard-to-find
(and extremely heavy) Vivitar Series 1 90-180 macro zoom. Also Charlotte
Camera has a 28-48 at an unusually low price.
Paul Farrar
> ----
> Andrew "frugal" Dacey
> frugal@xxxxxxxxxxxxxxx
> http://www.tildefrugal.net/
>
>
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