[LRFlex] Re: Extension tube #14198 question

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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