> Wayne Harridge <wayneharridge@xxxxxxxxxxxxxxx> wrote:
>
>
> > Julian Davies <julian_davies@xxxxxxxxxxxxxx> wrote:
> >
> > I don't believe you'd see anything much through the viewfinder, to
> > start
> > with. Even at 65mm, the tube would have more than doubled the back
> > focus,
> > and therefore the image area would be more than four times the
> normal
> > size.
> > According to my maths (often questionable), that's nearly 3 stops
> of
> > light
> > loss. From f5, that's dim!
> > The 80 and 135 macros are designed with this extended back focus in
> > mind.
>
> With the zoom set at 85mm and infinity with 65mm of extension the
> maginication
> will be a bit less than 1:1 and exposure compensation a bit less than
> 4. As you
> zoom towards the 25 end the magnification (and exposure) will
Oops, I meant 250mm end of the zoom.
> decrease and the
> working distance will increase.
>
> >
> > Julian
> >
> > > Fernando Gonzalez Gentile wrote:
> > >
> > > >Hi Moose,
> > > >
> > > >While we're at it, what do you think of coupling the 85~250/5 to
> a
> > 65~116mm.
> > > >Any experience anyone? I realize its a rather awkward combo, but
> > apart
> > from
> > > >that...
> > > >
> > >
> > >
> > >
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> > >
> > >
> >
> >
> >
> > < This message was delivered via the Olympus Mailing List >
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> > < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
> >
>
>
> Wayne Harridge
>
> http://members.optusnet.com.au/~w_harridge
>
> < This message was delivered via the Olympus Mailing List >
> < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>
Wayne Harridge
http://members.optusnet.com.au/~w_harridge
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