guide scope size

Using SharpCap's Polar Alignment feature
Post Reply
darknight
Posts: 5
Joined: Thu May 18, 2017 12:38 pm

guide scope size

Post by darknight » Thu May 18, 2017 12:43 pm

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 :)

cuivenion
Posts: 45
Joined: Wed Feb 15, 2017 7:37 pm

Re: guide scope size

Post by cuivenion » Thu May 18, 2017 4:27 pm

It will depend on what guide camera you're using too, pixel size will effect the fov.

User avatar
admin
Site Admin
Posts: 733
Joined: Sat Feb 11, 2017 3:52 pm
Location: Vale of the White Horse, UK
Contact:

Re: guide scope size

Post by admin » Thu May 18, 2017 4:53 pm

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

darknight
Posts: 5
Joined: Thu May 18, 2017 12:38 pm

Re: guide scope size

Post by darknight » Thu May 18, 2017 5:31 pm

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 :)

Ukjay1971
Posts: 10
Joined: Fri Mar 03, 2017 3:09 pm

Re: guide scope size

Post by Ukjay1971 » Wed Sep 27, 2017 11:25 am

The field of view in degrees is actually 0.69° x 0.52° - still above 0.5°

https://goo.gl/jLG5eu

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest