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Starlight Xpress AO unit and focal reducer
Posted 24 July 2011 - 06:10 PM
Anyhow I guess the question is this - does anybody know of a fundamental incompatility between an SX AO (i.e. the 12 mm thick glass deviator plate) and a focal reducer with a tight tolerance on the reducer to CCD sensor. If not more work to get the spacing right and eliminate any tilt. Thanks for any help.
Posted 25 July 2011 - 04:28 PM
Posted 25 July 2011 - 09:50 PM
Posted 25 July 2011 - 11:49 PM
Posted 27 July 2011 - 04:24 PM
Focus a star in the centre of sensor, then taking continuous images move the scope a little so the star is in one corner of the sensor (the one with the worst distortion). Then adjust the separation until the star is round. Repeat as necessary. In my case I had a good distance of thread between the CCD and the SX AO to allow 2 or 3mm of adjustment. When I resume (hopefully tonight) I will repeat and then find a spacer to take up the unused thread so the all is firm. There may also be a bit of tilt to correct for but I think spacing is the major issue. I do not believe clamping the corrector in the focuser is an issue.
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