[photo-3d] RBT - extended range pin bars

["Franklin J. Flocks" <fjf@xxxxxxxxx>]

       I just got some of the .1 and .2 pins for RBT mounts from
       Jon Golden - Until I read about them here, I hadn't realized
       that RBT was making them - I occasionally shoot with twinned
       SLRs using 135mm and 200mm lenses - Even with an extra heavy
       mounting bar (that was custom made for me by John Berkowitz)
       its difficult to prevent height errors between the two chips.
       The extended range pins are just what I needed to fix the 
       problem - With two .2 pins you can get an offset of up to
       .7 mm -     Jon Golden told me that he hadn't mentioned
       the availability of this special pins before, because he 
       didn't think there would be much interest in them - after all
       you can always tape down the chips in an RBT mount, where you 
       have a large height error -  - But I think they are great-
       particularly where the height error is so large, that you 
       couldn't use even one of the regular pin bars, and would
       otherwise have to tape down both chips.