Search the CONFOCAL archive at
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal

My suggestion would be to forget about apos; even though
Olympus did make some UV compatible ones they aren't likely
to be common.  Just use an ordinary plan-fluor lens and you
should get quite enough transmission at 340.  And it won't
cost you nearly as much!

                                                 Guy Cox

Dr I F Gow wrote:

> Search the CONFOCAL archive at
> http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal
>
> Hi - not strictly confocal, but maybe one day....we have an old Olympus
> IMT2 we use for Ca measurements using fura2, but the 340 attenuation is
> impossible.  I've trawled the web looking for a x40 dplan apo uv lens but
> no luck.  Are there any equivalent lenses which would work on this which
> are still available such as Zeiss or even russian ones?
>
> regards
>
> iain