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Old 02-06-2011, 10:48 AM
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Paul Haese
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Join Date: Jan 2009
Location: Adelaide
Posts: 9,991
Update time

With all the drama of trying to get my pointing better on the PME I have not had much of a chance to get the scope tested. I did get some chance at it the other night and ran it around a little. Attached is a single frame with some slight noise reduction and nothing else.

Collimation needs addressing but I did not have time to get it sorted at 3 am. The collimation screws are a bit stiff and this requires a firmer grip than my frozen fingers. One screw is excessively stiff, and needs backing off a lot.

Guide parameters need looking at too. Going from 1.6m to 2.0m in focal length made a bit of difference to the guiding. Some egg shape to the stars but I can live with that for now.

Basic star test did not show any abnormalities but I want to do a more thorough test for the final review.

The image looks quite sharp, but a full imaging run will determine what is any defects there are in the system. I think the focusor is going to be ok, but moving from one side of the meridian to the other will show me whether there is any slop.

Incidently I was using the Tak flattener and this seems to work ok but under CCD inspector it says pretty much the same as for the 8". There is still quite a bit of field curvature but not overly evident to the eye.

Feel free to comment. A thorough analysis of the image is what I am looking for here.
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