[APML] 500mm mirror lens as a guidescope?

[George Anderson <georgea@cam.org>]

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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