60mm f/20... 80mm f15 comparo
Posted 17 March 2012 - 03:54 PM
Rigel absolutely beautiful APO type view at 60mm, f/20, However I found the view more pleasing unmasked at 80mm mainly because the secondary was noticably brighter.
Alnitak surprised me, the 60mm with a 9mm eyepiece showed a crisp split when skies steadied. I've never had this good of a view with any 60mm scope. Using the same eyepiece at 80mm the view wasn't as good or sharp... So I cheated and used my 4.8mm Nagler and now the 80mm won. I learned that 60mm f/20's have amazing abilities. I'm sure owners would agree. Cheers, Bill
Posted 17 March 2012 - 06:39 PM
Posted 17 March 2012 - 06:55 PM
Thanks for posting your comparison. That was an excellent idea and I think I'll do the same type of comparison using my new to me Tasco 10K (80mm f/15) if I ever get a clear night.
Posted 17 March 2012 - 09:14 PM
Stopped down to 60mm this 80mm f/20 would become uh, f/26.6. Would
there be an advantage to that or is f/20 ideally refractor sloooow?
Posted 18 March 2012 - 04:23 PM
Posted 08 April 2012 - 07:41 PM
That 80mm f/20 above is insane
Posted 09 April 2012 - 04:21 PM
Posted 10 April 2012 - 10:30 PM
I forgot to get back to your thread...sorry... the collimation is perfect. As fine as I've seen, a remarkable 80mm scope.