Thread
:
How to know if OTA is a decent scope
View Single Post
#
5
30-07-2018, 11:51 AM
Merlin66
(Ken)
Registered User
Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
Alex,
He seems to have tested the mirror at the centre of curvature which would yield a distance of twice the focal length......
Merlin66
View Public Profile
Visit Merlin66's homepage!
Find all posts by Merlin66