*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

You can use a water lens with a long distance but we will have to use a clamp to hold water. 
The collars are available from Zeiss. I have already made such an arrangement with a 20 X 
water immersion 2mm WD. It's better to use an inverted microscope to do that. You can add 
drugg and nutriments during your acquisition.