ATM (no subject)

[Gary Myers <gmyers@CetLink.Net>]

>> Steve Bell wrote :
>>It may be that the only condition where
>>it should look centered, to the human eye, is when the secondary is at
>>45 deg. 

Not true! It can look centered if the secondary is placed at the
tubaxial offset (down) and NOT the focuser offset (away). The problem is
when this condition happens that the center line now shifts down towards
the primary by the amount of the offset! Also for a closed system
(cheshire setup) the primary will have to be tilted! 

>>And, it seems to me, you would have to know how much to tilt the
>>focuser beforehand, an apparently impossible data point to know for >>the 
>non-precognicient.

I just posted a means of setting up the focuser... I have used in the
the past (and last night) and it works very well.

G.