Re: Use of stereo eyepieces in compound microscope???

In article <[EMAIL PROTECTED]>, BOB 
MARABLE <[EMAIL PROTECTED]> writes
> I'm just a hobbiest at microscopy, with a very limited "allowance" for
> equipment (hope my wife doesn't read this!) Here's my problem--I have
> a Zeiss Axiostar 'scope, with infinity tube correction, and which
> takes the larger-size 30mm barrel eyepieces.  New eyepieces of this
> size are very expensive, and I've found only a meager market for used
> items for this series--however, I think many stereo 'scopes use 30mm
> eyepieces, and there's substantial availability of used and
> alternative-vendor items for these 'scopes.  What are the
> issues/ramifications of using "stereo scope" eyepieces in a compound,
> infinity system?? I appreciate all input!!
> Bob Marable

I don't know the answer to your question, as I don't know the standards 
to which stereo microscopes are designed. However, it is quite simple to 
make a pair of steel or brass sleeves to use 23mm barrel eyepieces in 
30mm tubes. If you have a friend with a lathe he/she should be able to 
make some for you in 30 minutes; I made one a few months ago simply to 
use as a protective sleeve to use while machining a thread on an 
eyepiece - I made the outside 30mm just in case I ever wanted to do 
this.

To pick up on Gregor's comment, you should probably stick to a Zeiss 
eyepiece if possible. AIUI, Zeiss objectives (at least in the 160mm tube 
length era - I don't have any infinity corrected ones) are designed with 
a similar amount of LCA (lateral chromatic aberration, or chromatic 
difference of magnification) in them, and all the eyepieces are designed 
to correct this.
--
David Littlewood