[LRFlex] Re: Extension tube #14198 question

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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