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Old 17-04-2020, 09:43 AM
DRCORTEX (Lance)
Neo - as in Dr Neo Cortex

DRCORTEX is offline
 
Join Date: Dec 2005
Location: Mt Druitt
Posts: 205
Hi All,

I have played around with the Hubble Artifical star indoors for collimation, using Telescope Circles.

It looks pretty well spot on in Telescope circles

I then did a 10s stack of 10 frames of Omega Centauri ( see attached ). I didn't spend too much time on the image at this point.

I still don't seem to be able to obtain a pinpoint image of Alpha Centauri, same thing doughnut becomes clearer, reaches the focus point ( a blob ), then starts to defocus again as you move further inwards or outwards as the case may be. This is using a Celestron motor focuser at rate 1.

I have ordered a Bhatinov mask, to see if that helps.

My next questions are - could this be due to heavy light pollution, or perhaps the camera is not quite the distance it needs to be from the visual back ? Is there a way of determining exactlly what this distance should be using an F/6.3 reducer ? I must admit, the wider FOV the reducer delivers, does make things just that little bit easier.

Cheers,

Doc
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