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The A1 has an automated beam expander for its Chameleon.  It's calibrated
for each lens.

Craig



On Wed, Aug 29, 2012 at 12:28 AM, Pascal Weber <[log in to unmask]>wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> *****
>
> The black ring is not normally done in plastic but metal (Zeiss objectiv).
> Normally the stand contains a lens that compensates for filling the pupil
> for
> each objectiv (except Nikon ?!!). The laser power is not concentrated on
> this
> ring.
>