|Sonotubes painted black|
- 12 inch Sonotube 8 feet long (available at a concrete supply store)
- 10 inch primary telescope mirror
- 10 inch mirror mounting cell
- 10 inch Spider mount for the secondary mirror
- Secondary mirror
- 2 inch focuser
- Saber Saw
- Drill and bits
- Hole saw
- 1-inch screws, 1 box
- Wood glue
|Mounted cell and eyepiece|
|Alignment of the primary, secondary and eyepiece.|
|Mirror cell mount and adjusting screws.|
|Handy right angle|
shown without mount.
In daylight, point the telescope at a distant building or object (Mt. Ranier works up here in my neck of the woods because you can see it from everywhere). Adjust the telescope so the object is in the center. Look through the finder scope and see where the object is. There are adjustment screws on the side of the finder scope mount that can be tightened or loosened. Carefully so as not to move the telescope off target, adjust the mount screws on the finder scope till the object is centered on the cross-hairs of the finder. The telescope image should be centered on the exact spot. That way, when you are looking for something at night, you can push the tube around till the finder scope is lined up on what you see and then the same thing will be in the eyepiece of the telescope.
That's pretty much it. It's really not hard except for getting your measurements right. Having that focal length right is the key. If for some reason you don't have the focal length for your primary, try the method for calculating the focal length described at this link.