[LRFlex] Re: Extension tube #14198 question
- From: "Peter M. C. Choy" <pmcc_2000@xxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Tue, 26 Apr 2005 14:44:28 -0700 (PDT)
Doug,
The 14198 should be on its way and in my
hands first of next week. Thanks for the
thoughts on collar removal. My neurons can
deal with the setscrew, but I am mentally
challenged by the prospect of ungluing.
Any hints? How firm a grip are we talking
about here?
Peter.
SF,CA and Melbourne, VIC.
--- Doug Herr <telyt@xxxxxxxxxxxxx> wrote:
> If it's 2-cam you don't get full-aperture metering
> on R bodies. That's the
> only difference. BTW the collar is held in place
> with a setscrew and glue.
>
> Doug Herr
> Birdman of Sacramento
> http://www.wildlightphoto.com
>
>
>
> on 4/25/05 9:43 PM, Peter M. C. Choy at
> pmcc_2000@xxxxxxxxx wrote:
>
> > Doug,
> >
> > Many thanks. I'm hoping I will be able
> > to modify a 14198 in the way you suggest,
> > provided my gray matter is up to the task.
> > The only remaining issue is whether the
> > particular 14198 I have in mind happens to be
> > a 3 cam model. Will your suggested modification
> > work for my purposes if it turns out to be
> > a 2 cam model?
> >
> > Peter.
> >
> > --- Doug Herr <telyt@xxxxxxxxxxxxx> wrote:
> >> on 4/25/05 6:59 PM, Peter M. C. Choy at
> >> pmcc_2000@xxxxxxxxx wrote:
> >>
> >>> I have a 2nd version triple-cam 60mm Macro
> Elmarit
> >>> that I use on my SL2. The extension tube that
> >>> goes with this lens is #14256, which I believe
> >>> is R only and thus can't be used on the SL2.
> >>>
> >>> Can anyone tell me if the extension tube that
> >>> goes with the lst version of the lens, #14198,
> is
> >>> compatible with the second version of the lens?
> >>> If so, is it possible to use the first version
> >>> extension tube with an SL2 and the 2nd version
> >>> 3 cams 60mm Macro Elmarit?
> >>>
> >>> Thanks in advance.
> >>>
> >>> Peter.
> >>
> >> I know of no reason the 2nd version 60 Macro
> >> couldn't be used with the
> >> 14198. You can use the 14256 if you modify the
> >> camera-end flange, but you
> >> will have to use stop-down metering on the SL2
> when
> >> you use this modified
> >> 14256.
> >>
> >> A better (IMHO) solution is to get a 3-cam 14198
> and
> >> remove the collar that
> >> fits over the 60's aperture ring. This will then
> be
> >> usable with any
> >> Leicaflex-compatible lens and either R or 'flex
> >> bodies with full-aperture
> >> metering. You even get full-aperture metering
> with
> >> single-cam lenses! A
> >> further modification is to have the lens-end
> flange
> >> modified to fit R-only
> >> lenses, then you will have a truly universal
> Leica-R
> >> extension tube.
> >>
> >> Operation with this modified extension tube
> requires
> >> a bit more brainpower
> >> than with the unmodified tube but if you can type
> on
> >> a keyboard you ought to
> >> have an adequate supply of functional neurons.
> >> Here's how it goes:
> >>
> >> ) set the lens' aperture ring to the minimum
> >> aperture
> >> ) assemble the various parts
> >>
> >> (these two steps can be performed in random
> order)
> >>
> >> ) when metering, use the aperture ring on the
> 14198
> >> ) think of the 14198's aperture settings not as
> 2.8,
> >> 4. 5.6, etc, but as
> >> "full aperture", "one stop down", "two stops
> down",
> >> etc. Obviously this
> >> corresponds quite well to the actual settings
> >> (neglecting extension factor)
> >> when the lens' maximum aperture is f/2.8.
> >> ) be aware of the lens' minimum aperture and
> don't
> >> try to stop the 14198's
> >> aperture ring down farther than the lens's
> >> corresponding actual aperture.
> >>
> >> Doug Herr
> >> Birdman of Sacramento
> >> http://www.wildlightphoto.com
> >>
> >>
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