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Difficulty with Skywatcher pro 150 collimation. Has anyone collimated one of these. adjustment hex screws at the back seem very tight - may have loktite on them.

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Watch this video on collimation.

Posted on Oct 04, 2009


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I have a T1000HD telescope . I was wondering what I need to do to be able to see planets such as Mars, Jupiter and Saturn's rings. Is it just a matter of getting different eyepieces? If so what kind?

That scope came with a 25 mm and a 10 mm eyepiece, which will give about a x40 and a x100 magnification respectively. If the seeing is good (clear sky, not dusty or windy, and the planet not too low (at least 30 deg up from the horizon) you should get a reasonable view of the planets, with these ep's

If you do not have any ep's you could buy 2 or 3 plossl type ep's (nothing more expensive is justified) of say 10 mm, 25 mm, and 32 mm. It looks like it takes ep's with a 1.25" barrel.

The theoretical limiting power of your scope is about x 220, which is about a 4 mm eyepiece, but at that extreme you will find the viewing object is dim, fuzzy, hard to get into the field of view, hard to focus, and totally frustrating.

Sadly this scope is just not a very good one, sorry to sound elitist. One of the issues will be that of collimation (optical alignment). You can never properly focus the scope unless it is collimated. Reflector scopes (with a mirror) all have this difficulty. You can tell if it is collimated with a star test

There should be 3 screws on the bottom end of the scope, where the mirror is. These are the collimation screws. Have somebody screw these in and out while you look through the ep. Remember you can only assess the collimation when the defocussed star image is right in the middle of your view.

Dec 12, 2016 | Optics

1 Answer

I have a dobsonion 306 mm reflecting telescope it is perfectly collimated but whenI observe a planet (currently Jupiter)I am getting mutiple images on both sides of the main image. The mirror is 15 mm...

If you are satisfied it is well collimated, then:

- did you use a laser collimator? If so is THAT collimated? Lots of them are not.
- check all the adapter rings, diagonals, barlows etc that you might have are all properly seated
- then, I'd say your main mirror securing clips are done up too tight and are distorting the mirror. They should only just touch lightly.

Jan 10, 2013 | Edu-Science (10166) Telescope

1 Answer

10X40 monocular. Prism is loose and has come out of place. 2nd one I've had trouble with. How do I realign the prism?

I ASSUME this device has collimation screws on the side of the barrel-- if it does not then the prism cannot be aligned.

If it does have collimation screws then hold the small monocular up to a lighted window and adjust the screws until you get a ROUND circle of light-- if you see a "catseye" light circle the prism is not collimated.

Aug 30, 2011 | Barska Optics Optics

2 Answers

Hi, I have bought a Meade DS-2102 MAK. It has a hint of misalignment with the airey disc slightly off center in the extra focal rings. I can't find any reference to which are the collimation screws. ...

Yes, you can do it.

Put the tube vertically on a table.

Remove the thumb wheel of regulation by unscrewing slightly the blocking screw with a key Allen of 1,5 mm.

Undo the 4 screws with a Phillips screwdriver.

Remove all the back part and you'll see the 6 screws of collimation.

The 3 longest are of use to the blocking, the shortest in the regulation.

Unscrew slightly the blocking screws before regulation.

It is necessary to make the little images of 2 mirrors coincide at the bottom inside the tube.

Also verify at the front part of the tube all the images of circles are concentric.

Don't block strongly the blocking screws after regulation.

Sorry for my bad English, I hope you'll understand.

Apr 09, 2011 | Meade DS-2102MAK (20103) Telescope

2 Answers

I lent my Celestron 9.25 SCT to a friend and he said he had collimation issues. He said he couldn't find the collimation screws on the secondary so he unseated the retainer ring and pulled the secondary...

Yes because the corrector plate must be replaced in the exact position it was removed. There were probably also small paper or cork "shims" around the glass plate that must also be replaced exactly. Your friend messed up your scope most likely.

YOU DO NOT need to remove the corrector plate to collimate an SCT. The collimation screws are on the center of the plate and accessible from in front of the scope.

Mar 08, 2011 | Celestron CG9-1/4 9.25-inch Schmidt...

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I am trying to collimate a nexstar 130 slt scope but i am unable to see the 3 primary mounting clips thru the collimator. everything else seems to be in the center of the it collimated ok?

The primary mirror is adjusted from the bottom of the tube. A second person adjusting the screws while you look through the collimator is what you need to do.

Nov 21, 2010 | Optics

1 Answer

Out of focus

Yes it's called collimation:

Watch this video.

Aug 11, 2009 | Tasco Luminova 40076420 (420 x 76mm)...

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