Old Meade Comet Tracker 622
Posted 12 November 2005 - 07:24 PM
My particular unit has well corrected optics. However mechanically and cosmetically it doesn't stack up with my Comet Catcher. In fact the old Meade R&P focuser is nearly unusable, even with degreasing and a Super Lube treatment.
I want to improve this Comet Tracker. collectable I hate to modify it since it's much rare than the Comet Catcher, however without a mod I find it unusable. Any hints and suggestions? I'm thinking of a better R&P or a crayford.
Posted 12 November 2005 - 07:26 PM
Posted 13 November 2005 - 09:53 PM
My focuser isn't great but it works OK (I've never done anything with the lube). With the very low profile of the focuser and the short focal length, I find it has a lot of image shift if extended a lot. What's the problem with yours?
Posted 13 November 2005 - 10:12 PM
Posted 15 November 2005 - 09:13 PM
Posted 16 November 2005 - 06:40 PM
Posted 16 November 2005 - 08:00 PM
Posted 16 November 2005 - 09:22 PM
Collimation on this scope is critical for good performance and a bit interesting. Due to the diagonal mirror being offset as much as it is (as it should be), out of focus star diffraction patterns are symmetrical only when very close to focus. As you move further from focus the shadow of the secondary is off center.
Here's a picture I took through the scope some time ago with a 35 mm camera at prime focus. I think it was around a 15 minute exposure on 400 film.
Posted 25 July 2006 - 02:27 PM
By this time this will probably be ancient history, but a simple reversible visual fix for the balky focuser might be one of the 2-inch to 1.25 helical focuser adapters that Orion sells for about $45.00.
Posted 28 July 2006 - 07:13 PM