> 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 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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> >
> >
>
>
>
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>
Wayne Harridge
http://members.optusnet.com.au/~w_harridge
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