While the same as your back to back caps, I have a different intent  
in mind. I won't store lenses back to back on a siamesed cap ... that  
makes the total package too long for my bag/slot design and means  
hunting for the right lens as part of a lens pair, can mean even more  
bits to juggle. I tried it with my Leica gear some years ago but  
didn't like it very much.

The purpose for the back to back rear caps is to enable changing the  
lens more quickly and reducing the amount of bits juggling you have  
to do in the operation of "pull out a lens - pull the rear cap - put  
a cap on the lens you just took off the camera". With back to back  
rear caps, you twist a lens onto the one you just pulled from the  
bag, then hold the cap and twist the other right off, barely moving  
your hands. The lens that goes in the bag has a cap on the rear in  
the end, with a siamesed rear cap opening unused.

Because I will not depend on the caps to stick together with the  
weight of two lenses bearing on the cement joint, almost any cement  
will do (epoxy, rubber cement, cyanoacrilate ...). Their join could  
always be reinforced with a glued in reinforcing ring too.

Godfrey

On Oct 23, 2006, at 8:23 AM, Shel Belinkoff wrote:

> I've done that for years, and it works great.  I can carry two  
> lenses in
> the space for one.  Some different techniques and epoxies have been  
> tried,
> and although none of the caps have separated, the later attempts  
> both look
> nicer and might even be a little stronger.  If you'd like some tips or
> ideas, just let me know.  My first attempt was sent to Bob Walkden  
> several
> years ago, and AFAIK, he's still using the back-to-back caps I made  
> for his
> Leica glass.
>
>> Another thing I'm going to do is buy six rear caps and glue them
>> together into pair. That will make it easier when doing a quick
>> change to transfer the cap from one lens to the next ... just connect
>> the lens you just took off to the one you just pulled out, then twist
>> the one going to the camera off and drop the other back into the bag.


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