How to adjust crayford focuser?
First, loosen the counterscrew, focus stopping screw and the two screws to the left and right of the tension adjustment screw in the middle of the crayford focuser bearing plate. Then tighten (or loosen) the tension adjustment screw, so that the focuser tube does have a good grip and does not slide by itself.
How does a dual speed focuser work?
A dual speed focuser can provide two focusing speeds by using a set of co-axial knobs, one for fast focusing and another for fine focusing when the film or CCD is near the perfect focal plane. This is different from the two separate focusing knobs seen on low level microscopes.
How does a Crayford focuser work?
The Crayford design moves the focuser drawtube by applying high pressure on a metal drive shaft that in turn presses against a flat surface machined into the metal focuser drawtube. The drawtube is held in place by sets of bearings on the opposite side of the drawtube from the drive shaft.
Can you upgrade your telescope?
To sum up, for a 4-inch f/10 telescope we suggest an upgrade kit including a 40 mm Plossl eyepiece, a 12 mm Plossl eyepiece, and a two-power Barlow lens. While you may need to vary the selections to fit your starter scope, you can easily obtain a similar set of new eyepieces.
How does a focuser work?
The focuser moves the eyepiece holder up and down slightly, adjusting the focus of the eyepiece for each individual observer. There are friction focusers or rack-and-pinion focusers. Regardless of the type on your telescope, your focuser should move smoothly without causing your telescope to shake.
What is a focuser used for?
An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear: a camera with automatic focus.
How does a helical focuser work?
Helical focusers With the simplest type the eyepiece or camera rotates as the focus is changed whilst in the more complex type the orientation of eyepiece or camera will not change. One excellent application is to add one to the rear of a Schmidt-Cassegrain telescope.