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Ken,
Thanks. That I may try at some point, though I never messed
with index adjustment before.
My immediate plan is to measure small star distances,
2,3,... to 9 degrees, to see where the problem exactly is.
The smallest star distance I measured so far was about 10
degrees and it already has error about -0.9' (as most of the
other star distances)
while the index error is probably -0.3, but definitely not
more than -0.6'. Thus something happens between 0 and 9 degrees.

Alex

On Mon, 24 Apr 2006, Ken Muldrew wrote:

>
> On 24 Apr 2006 at 10:17, Alexandre E Eremenko wrote:
>
> > The only explanation I can imagine is that the arc is deformed near 0.
> > (Worn after so many index checks, as Bill joked:-) Inspection of the arc
> > and teeth with powerful magnifying glass shows no defect.
>
> You could put the mirror way out so that your index error is about 2
> degrees and see if that helps.
>
> Ken Muldrew.
>

   

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