Collimating your Schmidt-Cassegrain telescope in just a few minutes

The A&NC’s Ralph Bell shows you how to quickly collimate a Schmidt-Cassegrain telescope using an Astro Engineering Picostar artificial star collimating aid. Presented by Ralph Bell.

Produced by A.R.B Media Productions for The Astronomy and Nature Centre


Ray Visser says:

This isn’t very helpful for the amateur.  A,how do I attach a camera and B, where do I get an artificial star and C, how do I get the cap off to see the screws.

Vitor Reis says:

Fantastico! Muito obrigado pelo video! Greetings from Brazil

James Benet says:

Excellent video, thanks a lot!

Joseph Wonderless says:

Is there anyway to collimate a Schmidt-Cassegrain telescope without  going through all of the things that you do? What happens if nothing gets in focus when pointed at a star regardless of what is done?   Mine is a nightmare , and the only thing that I see is a out of focus light. And where is the star or light at in relationship to the secondary mirror  when looking through the eyepiece? Is it behind the secondary mirror or along side of it?

Allan Bond says:

just the video iv been looking for…good work

RC Johnson says:

Great video, but please keep that screwdriver away from the optics!  Replace the collimation screws with knobs that can be turned using clean hands.  Fingerprints are far more forgiving than a fumbled metal tool.  I couldn’t stop from cringing every time the screwdriver passed in front of the telescope.

Jeb says:

unless you are throwing your scope down the stairs…
Love this video thanks for posting.

Paul T says:

Excellent advice, thank you.

Gary Zapotoczny says:

Awesome video! Thank you for taking the time and effort to make this.

Donald J. Trump says:

What about the corrector plate, isn’t that a step before collimating the secondary?

Nirmal Rajah says:

I accidentally removed the secondary mirror of my cpc 1100 , i put it back but the images appear like a streak. I disturbed the collimation severely, Should i try the method you mentioned above (its going to take a long time) or is there any other way to collimate it?

Lawrence Mok says:

I do that in reverse, first move the scope so that the ring looks the best (doesn’t need to be in center), then adjust screws to move the ring to the center of eyepiece….. repeat until the ring is round and center in eyepiece

also only loosen the screws one a time… that means if you loosen one, you tighten the two others

yoderjjy says:

Thanks for making video. The instructions that came with mine said to “move” the rings to the edge of the field of view and then adjust screw to make rings symmetric. Does it matter whether it’s centered in the middle of the field of view?

honorio sergio says:


David Williams says:

Thank you sir.  very helpful.

Mik P says:

Very helpful especially the trick of placing the screwdriver out in front of the telescope to work out which of the 3 adjusting screws is closest to the small side of the image

dr7asans says:

amazing video,,, to be honest, after reading the telescope manual regarding the collimation I found it hard and complicated. But after watching this video….. is it that much easy !!.  thank you sir

Jack Lawrenson says:

can you use a normal star

Gerard Doets says:

Thank you

Billy Ray says:

Thank You 🙂

Mark N Donna Jones says:

Thanks it gives the basic of what you need to do especially good for those that Macgivyr their needs as most amateurs do.

jgroub1 says:

Wow, is it really that easy? That seems amazingly easy!

rwolf01 says:

Question:  What is the best magnification (eyepiece) to use to get the diffraction rings?  How far out of focus should we have to go to get them?  Thanks.

Rick Evans says:

Well, done. Very helpful.

Gamers says:

I own a celestron 4SE this is one chore I hope I never have to perform.

Nikul Suthar says:

A million thanks!!! Very helpful to me indeed as I’ve the same telescope with me and collimation has been a nighmare for me… 🙂 🙂 🙂

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