Centre the secondary mirror mount in the shaft of the tube near the extended stop.
The secondary mirror of a reflector telescope sits in the centre of the opening of the tube. The ablaze enters the manage limitation, passes encircling the secondary mirror, bounces off the leading mirror, is focused back up the tube to bounce off the secondary and up the focusing tube. In that the telescope is focused at infinity, the secondary mirror does not block the prospect, on the contrary one dims the overall brightness of the carbon copy. Adjusting the secondary is a intelligible operation.
Instructions
1. Adjust the collimation screws on the back of the primary mirror mount or cell so that the essential mirror reflects flashing directly back up the telescope tube. Whether you observe down the tube from the free site with your eye at the centre of the tube, you should peep an counterpart of the edges of the unlatched point centred in the mirror. Adjust the screws and differing springs till the mirror is aligned with the centre axis of the tube.
2. Mount the spider mount and secondary mirror according to carton directions whether the mount wasn't already mounted in the telescope. The directions for this vary by type of mount and come with the mount. The mount is normally placed approximately Three to Four inches from the ajar confine of the tube, depending upon the focal length of the substantial mirror.
Tighten the collimation screws on the secondary mirror mount if yours come with adjustable screws. If the mirror is aligned, you should be able to look down the empty focuser and see your own eye reflected back to you in the center of the secondary mirror. Take it slow and easy so you get the mirrors perfectly aligned. If you collimate the mirrors well, your focus will be more crisp and focused and it will eliminate a distortion phenomenon called "coma" in which starts and objects in the scope have a false tail.5. Check for loose collimation screws on the primary and secondary mirror mounts and finger tighten them until they are secure without putting pressure on the screw. Install the eyepieces when you're ready to Stare at the stars.
3. Centre the spider mount protest with the mirror so the mirror is dead centre of the tube and reflects the carbon directly up the focuser tube hole. You will have to tighten and loosen the screws that mount the legs to the tube. Before tightening a leg to shift the position of the secondary, loosen legs on the opposite side of the tube, then tighten the leg that you want to tighten.4.
