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Greg R wrote

> Wonder if that might also account for the difference between side error
> measured against the sun and that measured with Jupiter?

You bet, but there are several fuzzy variables in play.  You might not have
been a list member when this topic was floating around.  I had a chance to
test several production scopes and a prototype over a two week (or so)
period. Alex also joined in the tests. I found all scopes exhibited a shift
in both side alignment and IE when refocused.

One follow up question is: if using the same eye, why refocus?

Three variables:

1.  Frank pointed out an excellent article in September 2005 "Sky &
Telescope" magazine.  Humans seem to suffer from night myopia to some
degree.

2.  A scope is not a high-tech camera optical device. Consequently a change
in the color of the body observed can change the focal point, requiring a
change in focus of the scope.

3.  The shades (filters) issue.  Different shades in the optical path MAY
shift IE or side alignment.

Hope that is of some help.

Thanks for your thoughts on the optometrist.  Hopefully he/she can put it
into terms a layperson can understand and use.

Bill




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