Instead of calculating, here are 2 solutions and they both involve existing
light:
1. Auto exposure mode.
2. Auto extension tubes in any mode you like.
How come I can't put extension tubes on the XA? What a crime!
Lama, who's going on a road trip next week. I'm taking every bit of shooting
equipment I own.
----- Original Message -----
From: "Jeff Keller" <jrk_om@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, August 01, 2003 1:39 AM
Subject: Re: [OM] external metering with extension tubes
> I believe the internal focusing changes the focal length. That would
> make it even more difficult to calculate.
> -jeff
>
> ----- Original Message -----
> From: "Lama-Jim L'Hommedieu" <lamadoo@xxxxxxxx>
> >
> > I guess if you have internal focussing, like the AF camp usually does,
> LE is essentially zero?
> >
> > Lama
> >
> > From: "John A. Lind" If
> > > [the lens is] focused closer than [infinity], the lens is extended
> further by its internal
> > > helical, in addition to the extension tube, and that extension must
> be
> > > added as well. The equation I use is similar, but also takes into
> account
> > > extension of the lens with its own focusing helical, FE:
> > >
> > > FF = (FL + LE + E)/FL
> >
> > FF = f-stop multiplier factor
> >
> > FL = focal length (nominal, when at infinity)
> >
> > E = Extension tube length in same units as LE and the focal length
> >
> > LE = lens extension
> >
> >
>
> < 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 >
>
< 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 >
|