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Hi,

some time ago a friend of mine claimed a certain Zeiss theodolith as
higly recommendable for star sights: Theo 010 (without "A" or "B")
He said something like "the mirror scope makes all the difference".

/Thomas.

Geoffrey Kolbe schrieb:
> I have
> a good second order theodolite which will directly in seconds of arc. The
> scale cursor is suspended by a pendulum, which keeps the theodolite
> "upright" to a third of second of arc. But this instrument is effectively
> limited by its 30 power scope, which improves the 1 minute of arc naked eye
> resolving power, to about 2 seconds of arc - in good light with good
> contrast. At night, with the star moving rapidly across the field of view
> and the cross hairs dimly illuminated, it is a struggle to get single sight
> altitudes much better than about 3 seconds of arc in my experience.

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