Optimum eyepiece location on GEM?

Started by mpupeza, 08/14/2008 07:39PM
Posted 08/14/2008 07:39PM Opening Post
I have a 10" f4.5 Newt on a GEM, where the eyepiece, if set up on top of the tube when polar aligning, requires me to stand on a stool to see through the eyepiece.
Is there an optimum location, scientifically, where I could rotate the tube and eyepiece and see through properly for 'most' of the observable sky?
I am at 45N. My horizon is usually mushy so I don't observe very close to it, and there's really not much around Polaris that I usually observe.
I realize that I can try several locations, but thought there may be some good advice here. My tube doesn't easily rotate, but can be turned, screwing up my DSC settings till I re-align.
Any thoughts?
Mike
10" f4.5 Newt (Homemade)on old Meade Starfinder GEM
6" f6 Newt (Homemade) on old Meade Starfinder GEM
Posted 08/26/2008 03:19AM #1
Boy!
Did I ever ask a stupid question!
I 'really' did think there was an answer!
Mike......>
Posted 08/26/2008 08:56AM #2
Hello:

This is an inherent problem with any equatorially mounted Newtonian. I had an 8" Newtonian on a GEM for a little while, and I set it up so that the eyepiece was pointing up when the scope was pointed north and the counter weight was closest to the ground. With this configuration, the eyepiece was easy to look through whenever the scope was pointed close to the meridian, which is the best time to look at objects. There were some annoying positions, such as for targets near the celestial equator that were about an hour from the meridian. In these cases, I had to get on a stool and stand over the mount and lean over the scope to look into the eyepiece. Tube rotation rings really are the way to go, unfortunately. We refractor and Cassegrain users just cheat and rotate the diagonal around, but Newtonian users have no such joy. Bummer dude.

Cheers
Mike Connelley