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Reflector telescopes are made with 2 mirrors. The main mirror is at the bottom and it’s bigger. The smaller secondary mirror is in the middle of the telescope near the eyepiece. Light from the main mirror is collected and concentrated onto the secondary mirror. The secondary mirror then directs this light to the eyepiece.
These two mirrors must be aligned properly or else the image quality will be reduced. This process is called collimation.
Tools
To get the best alignment, I recommend a laser collimator. These devices are cheap and pack a big bang for your buck. You can precisely align your telescope without frustration. They are also small enough that you can take it with you when you travel.
You can also buy a small center spot to attach to the main mirror or do like I did and make a small mark with a permanent marker. This small area will not affect the overall image since the secondary mirror blocks all light to the center of the main mirror.
A laser collimator is the best way to collimate your telescope.
Watch The Tutorial
The first step is to align the primary mirror so that it is pointing directly to the center of the main mirror.
I put a small mark on the center of the main mirror. You can use this method or you could place a small sticker there. The point of the mark is to know exactly where the center is. The first step is to place the laser collimator in the eyepiece and turn it on. If the secondary mirror is correct, the laser will shine directly onto the center of the main mirror. If this is not the case, then adjust the screws very slowly on the secondary mirror so that the laser lines up in the center.
Once this step is complete, it’s time to align the primary mirror back up the secondary mirror. The laser collimator can help you do this.
There is a small hole on the laser collimator where return light from the main mirror can enter. You carefully adjust the main mirror screws so that the light from the laser goes through the small hole and centers itself onto the target. Check out the video above to see exactly how I did this. In that video I show how to collimate the Celestron 127EQ. Note that in that video I have to remove the Bird Jones Lens. Your telescope may not have this but keep that in mind.