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Old 08-07-2019, 08:53 PM
RussellH
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RussellH is offline
 
Join Date: Oct 2005
Location: Sunny Queensland
Posts: 160
Off-Axis guider proís & conís, PA and multi-camera software

So I was going down the path of getting an OAG instead of a finder scope for my auto guiding.

For Proís, I was impressed with the extra guiding accuracy that OAGís provide, which is important for imaging, not having to match images with a guide scope for pointing accuracy and reduced weight in the mount.

Conís I knew of are focussing difficulties, careful alignment of the prism so as not to block the image sensor, the limited field view being picked up by the guide camera and possible image distortion and the extremes of the field of view.

However, Iíve just had the big realisation that if I canít feed a live view of my camera (Canon M50) into whatever software I end up using, then the limited field view to the guiding camera is probably going to make it impossible to use any of the automation tools to get my polar alignment as accurate as possible for long exposures. The seems a bit of a show-stopper, as without accurate PA, everything else falls apart.

Does that sounds right? Iím still researching all the various methods of PA through PHD, Ekos/Stellarmate, AISAir or the other numerous software solutions, but Iíd think theyíd all want an image with a decent FoV to resolve where things are pointing at, wouldít they?

All that aside, have I missed any other gotchas for OAGís? Does anyone with an OAG also use a finder scope as well, to try and ge the best of both worlds, assuming the software even allows swapping between multiple cameras for different functions?

Thanks.
Russell.
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