Request for information about Knife Edge Illumination, etc.
- From: Alan <lngndvs@xxxxxxxxx>
- Date: Sun, 29 Jul 2007 01:47:20 -0000
I have plunked about with my inferred version of knife edge
illumination after reading a brief bit about it, somewhere, about 20
years ago. Can anybody offer some insightful tips on variations of
this technique? I have used a card covering about 1/2 of the field
iris of a Zeiss Standard 16, with reasonable results. I suspect with
more insight, a better result can be had. Any ideas would be
appreciated.
My Standard 16 was put together by Zeiss from parts in their shop, at
a discount, many years ago. It is a monocular scope, with a 1.35 na
condenser. The condenser does not have any means available for
insertion of under-condenser filters. I have gotten the correct
screws for several threaded holes on the bottom of the unit. Is it
inadviseable to insert filters underneath?
Interestingly, I have kept this scope in ambient environment
conditions for over 20 years in the tropics, very seldom in an air
conditioned room. Unlike especially an Olympus SZH/10
stereomicroscope purchased over the Internet, the Zeiss has not yet
suffered severe crazing due to fungi (knock on wood). The SZH/10 is a
mess, especially the internal optical train.
Thank you for any suggestions about knife edge illumination.
Alan
.
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