Unitron Objective Question
Posted 18 January 2013 - 12:15 AM
Unitron used a dab of red paint on each screw, I'm going to assume to "glue" the screws in place. At some point the screws were turned and the paint is broken. As it stands it won't take much vibration for the screws to start falling out.
Thanks for any input.
Posted 18 January 2013 - 08:59 AM
After assembly, I'd check that the shims (I think there are some on these lenses) are where they should be. Then do a star test (glint of sun on a distant shiny thing) at the highest power to prove that nothing is pinched. Images in/out of focus should be concentric and round. The scope does work otherwise right?
Posted 19 January 2013 - 01:13 PM
My ultimate goal is to keep collecting Unitron parts until I have at least a full Unitron OTA. But yesterday I cobbled together a full 60mm scope using misc. parts I have lying around. First light last night was excellent, much better than I expected out of a little 60mm refractor telescope! Nice round diffraction rings either side of focus. M42 looked nice, with even a hint of green color. The trapezium was resolved easily. The core of M31 was a nice diffuse glow. Polaris was a easy split, but the companion star was very, very dim from my light polluted suburban back yard. No, it can't compete with my 102mm f/13 refractor, but it sure is a lot lighter to carry around!
Again, thanks for your input.
Posted 21 January 2013 - 04:35 PM