I own two 80 mm F5 refractors, a 127 mm F15 Mak and an 8" F5.9 Dob with a two-speed focuser.
I also have access to and use of a Meade LX200 GPS 14" at an observatory. That is the subject of this post.
The LX200 is not my scope, so I am not going to do any modifications or changes to it. But I need to better understand how to focus it. This is a process and procedure question.
Manual can be found here. I have read it several times.
There are two knobs on the back of the scope, on the right side. One is a lock knob, top, and below that is the course focus knob.
The scope has an electric micro focuser that is operated from the handset and does work.
The question relates to the two knobs.
1) Should that lock knob be loose? No matter what I do with it, it doesn't tighten. Now that may be OK, but it seems that if I turn this thing it should be locking the mirror in some fashion. It seems to be spinning loose, unconnected to anything.
2) The lower knob is the course focus knob. When I use this to do course focus, the image moves around in the eyepiece. I may get it close to focus but then it seems to jump way out of focus again with only a slight movement. This does not behave like any focuser I have used before.
The micro focuser works fine.
I spoke to a couple of people at the observatory. They said this is all normal, but somehow that does not make sense to me.
I have experience with a two-speed focuser on my Dob, but this seems to be a very different animal.
I need some education/advice. I am having problems focusing the scope for visual use. I wonder if I am doing something wrong.
Suggestions to buy some different kind of focuser are not helpful as this is not my scope.
Appreciate any information/recommendations.