(meteorobs) Rayxar X-ray lenses.

[Ed Majden]

on 8/29/05 9:21, Swift, Wesley at Wesley.R.Swift at msfc.nasa.gov wrote:

> ED,
> 
> Schneider has is a whole family of 400-1000nm c-mount "Xenonplan"
> lenses.  I call lenses for this range "silicon APO" lenses.
> 
> http://www.schneideroptics.com/oem/c-mount/visible_through_near_ir/
> 
Wes:
    Thanks again for the information.  I was mainly looking for "film" type
large format lenses for meteor spectroscopy, not short f.l. video system
lenses.  Gale A. Harvey from NASA/LRC used large aperture fast Maksutov
Cameras for his faint meteor spectra patrol in the late 1960's early 70's.
I tried to find one of these, but without success.  Probably too expensive
for an amateur anyway.  I was hoping they had hit the surplus market! ;-)
I normally use surplus Aero lenses for spectroscopy on 4X5 film but have
recently started using 6X6 format to cut costs.  I have a couple of used
Hasselblad EL/M cameras that I hope to use for an auto recording patrol
system controlled by a computer program.  This is being worked on.  Video
intensified systems are used for faint meteor spectroscopy but dispersion is
limited so a larger format is preferred. I also operate a video spectrograph
as shown on my web page.  Since 9/11 it is difficult to get surplus image
intensifiers exported out of the USA.  I have a 2nd Gen 25 mm MCP
intensifier but once that packs it in it looks like I'm out of luck finding
a replacement on the surplus market unless export policies change,  There
are of course intensifiers not made in the USA, Dedal and from China for
example.  New intensifiers are generally too expensive.  I would love to get
my hands on a 3rd Gen 25 mm or larger intensifier!

Ed

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