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guide scope size

Posted: Thu May 18, 2017 12:43 pm
by darknight
hey all,
I know this is an easy question, but as we haven't had a clear night for the past 5-6 days been unable to check.
I use a skywatcher st80 for a guidescope, now that's quite a bit bigger FOV and the 200mm recommended size, so will P.A still work or will I be better ordering an altair astro 50-60mm one?
cheers for time n reply :)

Re: guide scope size

Posted: Thu May 18, 2017 4:27 pm
by cuivenion
It will depend on what guide camera you're using too, pixel size will effect the fov.

Re: guide scope size

Posted: Thu May 18, 2017 4:53 pm
by admin
Yes, pop your scope and camera setup into a FOV calculator like this one http://www.skyatnightmagazine.com/field-view-calculator. If it comes out at at least 0.5 degrees in both directions then you should be OK. Any less than this is iffy, but is probably worth a try before spending money on a guidescope.

cheers,

Robin

Re: guide scope size

Posted: Thu May 18, 2017 5:31 pm
by darknight
thank you for the reply, well didn't have the gpcam2, so I just added pixel size/img size etc and it comes out 41x30, so according to that will be fine, thanks for the help :)

Re: guide scope size

Posted: Wed Sep 27, 2017 11:25 am
by Ukjay1971
The field of view in degrees is actually 0.69° x 0.52° - still above 0.5°

https://goo.gl/jLG5eu