RE: [APML] 500mm mirror lens as a guidescope?

["Chris Schur" <chriss@cybertrails.com>]

George, well for st4 guiding, a 1x to 4x the focal length in inches guide
scope works pretty well.  I guide my 12 inch FL schmidt with a 40 inch fl
cass, and it works awsome.

Chris Schur

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of George Anderson
Sent: Tuesday, September 02, 2003 7:57 PM
To: APML
Subject: [APML] 500mm mirror lens as a guidescope?


While messing around with getting my B&W quickcam autoguider working and
starting to worry about focuser flexure on my el-cheepo guidescope I
started wondering (dangerous habit)...
For widefield shots with a 35mm camera (50mm lens or less) would a
guidescope with a 500mm focal length be sufficient?
The 500mm f/8 mirror lens I have is very lightweight and has no
detectable barrel flexure. The effective aperture is only 62mm but that
is only a touch smaller than my 70mm f/10 scope that I use for manual
guiding.
Any thoughts from those in the know?

George Anderson
Montreal Canada

Clear skies and good health
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