Hello David,

The first surface mirrors are not easily to obtain. I have
needed them myself. The best source for them I know of is
to use the one in a Polaroid SX-70 camera. They are dirt
cheep on Ebay and optically near perfect. As for cutting
them to a circle. That is some skill. When I did glass
work ; mark the circle with a china marker with a template
on the mirror surface and do as many straight cuts as you
can then use a glass router table(stain glass hobbyist use
them for any inside glass curves needed) it is with a small
diamond wheel and gently follow the china marker line.
Someone in the group might know a better way to do a glass
circle.



Hope this helps.



Kind Regards,



Charla



_____

From: Microscope@yahoogroups.com
[mailto:Microscope@yahoogroups.com] On Behalf Of pennine56
Sent: March 13, 2009 06:36
To: Microscope@yahoogroups.com
Subject: [Microscope] Re: Seeking dichromatic mirrors for
Zeiss III RS epi-fluorescence condenser



Hello Fred and René

Many thanks for your suggestions, I'll contact them.

The Zeiss III RS head predates the filter cube design, which
in a way is good because the excitation / barrier filters
and mirrors all readily come out of different mounts.

It is the circular mirrors with first surface coatings that
have failed. Although the filters were cooked to a rough
semi-opaque finish these polished up a treat at home with
some elbow grease. Not sure what the fine abrasive is in
silver polish (alumina?) but removed this rough finish on
all the filters to give back a high polish and transmittance
without scratching the glass.

regards
David
>





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