Question about Optics

Open Question

Collimation Would like to know exact position of collimation screws or mechanism of the Canon 15x45 IS. Have X-rayed the binos, there are several screws immediately under the rubber cover, but which ones may be for collimation? Link to a photo with the rubber cover stripped, pointing out the correct screw would be a great solution:-) Collimation of any binos is easy once you find whichever mechanism the manufacturer chose; most often with screws on the housing or at the eyepeices, or with concentric rings at the front lenses of the binos. Only divert the tubes a little making two separate images next to each other, and then make adjustment with an object having vertical and horizontal lines. Like for instance a building... Knowing where the mechanism is on these particular binos would help a lot!

Posted by on


5 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to an Expert (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


SOURCE: collimation screws on the Celestar C8

If you are going to replace them contact "Bob's Knobs" and order the replacement thumb screws. Makes collimation much easier, no Allen wrench needed.

Posted on Oct 01, 2009


SOURCE: Difficulty with Skywatcher pro 150 collimation.

Watch this video on collimation.

Posted on Oct 04, 2009

  • 1 Answer

SOURCE: I lent my Celestron 9.25

What kind of a friend does that to someones scope without asking etc???

Posted on Nov 04, 2011

  • 1 Answer

SOURCE: Hi, I have bought a

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.

Posted on May 28, 2012

Testimonial: "Thanks edualc78. There was one problem here, as I was wanting to collomate on a star image. The problem wasn't as course as visual mirror alignment. It is not bad really. Your description was very handy when it came to fixing the flip down mirror though, which had stuck. I thought I was looking at alignment screws at the back, so wasn't in a rush to dismantle it to fix the mirror. Took 5 min once I knew I was just looking at a cover! Regards Jim"

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Is there an adapter so I can fit my 2"Collimation Tool into my .965" eyepiece holder on my telescope

There are adapters, but normally a 2" collimation tool is way way too heavy for a .965 eyepiece holder. Most of the eyepiece holders are made from plastic, and they break fairly easily, so you take a big chance of your 2" collimation tool dropping to the floor or concrete. Even if the plastic did not break, the weight of the collimation tool would bend the eyepiece holder out of position. It only takes the slightest amount to make your test worthless - after all, you're after precision. Bending or distorting anything destroys the precision. They do make 1.5" collimation tools, and there are adapters to get from the tool to your eyepiece holder. They also make things called "cheshire eyepieces" and regular collimating tools which will work with your 4" reflector.

Nov 05, 2017 | Celestron Cameras

1 Answer

Collimation of my lxd 55 8" tellescope i had to take off the secondry mirror and primery mirrror .due to kids play with them.i can seem to collimat the tellescope can you please tell my how to line...

The corrector lens must be perfectly centered and should have been replaced in the exact position as when you removed it. You are now left with trial and error-- turn the lens 10 degrees- check collimation-- turn the lens 10 more degrees check collimation etc etc -- until you are able to collimate the scope.

Jul 01, 2011 | Meade LXD55 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...

1 Answer

Winchester WL-7350WR 7X35 binos out of aligngment/colimation- need to re-adjust. Don't know if there's any objective lens alignment method, but I have found the rear adjusting screws for the prisms under...

There are another set of adjusting grub screws not just these! If you need to collimate them then you will need to adjust the correct ones to avoid what is known as "conditional collimation" where they are only good for people with the same IPD (interpupilary distance). If you feel confident that you can do this fine. But first is there any leaning field obvious? Using one side at a time and looking at a horizontal or vertical object (like a flagpole) show any lean when compared to the visual appearance? If it does then you need to send them to a service centre for correct alignment.

Feb 23, 2010 | Winchester Optics

1 Answer

Collimation screws on the Celestar C8

If you are going to replace them contact "Bob's Knobs" and order the replacement thumb screws. Makes collimation much easier, no Allen wrench needed.

Sep 29, 2009 | Celestron Celestar 8 Telescope

4 Answers

Dropped new Celestron Skymaster 15x70 binoculars. Nothing appears broken, but now have two images. Can I repair this. and how? Thanks. Dan

Don't "unscrew" the binoculars. there are no user servicable parts inside. the collimnation adj screws are beneath the rubber boot just under where your index fingers rest when looking through the bino's. use a jewelers screwdriver to tease the boot up and stick a small nut or something in. then put the binos on a stable surface and play with the screws a bit while watching the images. you can get them pretty close this way.

Jul 21, 2009 | Optics

2 Answers

Double tunnel vision

I'm assuming that you have the dioptre set correctly for your eyes.

Normally this is caused by a collimation error, caused when one (or both) of the prisms move, even by a small amount.

You will need to get this repaired/serviced as this is not a DIY problem. (Unless, of course, you have a collimator lying around)

Mar 21, 2009 | Optics

1 Answer

Repair of Celestron binos found in river

thought i answered this before but at my age who knows....the problem is water contains minerals that will eventyaully corrode the optics or at least the coatings.anyway if you want i can give you an esimate to

Nov 25, 2008 | Celestron Optics

Not finding what you are looking for?
Optics Logo

Related Topics:

37 people viewed this question

Ask a Question

Usually answered in minutes!

Top Optics Experts

Joe Lalumia aka...
Joe Lalumia aka...

Level 3 Expert

3186 Answers


Level 3 Expert

102366 Answers

Mark Campeau

Level 1 Expert

44 Answers

Are you an Optic Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides