Re: Liquid optic or cooling element ?

On Nov 19, 11:18 pm, "Adam Norton" <AnortonREMOVET...@xxxxxxxxxxxxx>
wrote:
I realized one other thing: This illuminator would need fairly large IR
absorbing glass filter. This would heat up in the center much more than the
edge and be prone to cracking. I once saw a modern Olympus fiber optics
metal halide illuminator that had a glass IR absorbing filter. This filter
was actually pre-cracked; that is, made of two filters with a joint in the
middle of the beam and loosely mounted.

-Adam Norton

Exactly -- the same feature , and I wondered why Leitz would put a
"broken" or two piece lens as the first lens in another but simular
output projector, in my huge Epidiaskop . This is where I borrow the
projecting optic and tube at the moment, and in that condenser unit,
it is exactly as how you say, the first lens (well it can easily just
be a filter as you say as I havn't taken it apart to discover) ---
anyway beside that, there also are an angled heat filter just in front
the bulb in the Epidiaskop ;

http://home20.inet.tele.dk/h-3d/Epidiaskop-sm.jpg

Please note the bottom lens , that is what I "borrowed" to check this
new Diaskop --- hope to find another one at Ebay one day --- what I
like though about the IV-BL compared the huge Epidiaskop, is that you
can adjust bulb and mirror , that is not that easy achived in the
Epidiaskop.

Thanks
.

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