View Single Post
  #2  
Old February 12th 04, 12:50 AM
Jon Isaacs
external usenet poster
 
Posts: n/a
Default Spotter scope for 12' Dob

hey all,

Is there any reason why a 70mm f500 would make a significantly worse
finder scope than a 80mm f400?


I would be concerned about the weight because of possible balance issues as
well whether it can use 2 inch eyepieces.

If you are limited to 1.25 inch eyepieces, an 80mm F5 scope with a 32 mm Plossl
can have a 4 deg FOV where as the longer focal length scope will be limited to
3.2 degrees.

Personally I think a good 50mm with a 7 degree FOV is nice... Lets me find the
stuff without getting overwhelmed when the skies are dark...

jon