Automotive Deals HPCC Amazon Fashion Learn more nav_sap_plcc_ascpsc Pink Floyd Fire TV Stick Sun Care Handmade school supplies Shop-by-Room Amazon Cash Back Offer showtimemulti showtimemulti showtimemulti  Amazon Echo  Echo Dot  Amazon Tap  Echo Dot  Amazon Tap  Amazon Echo Introducing new colors All-New Kindle Oasis Segway miniPro STEM
Customer Review

315 of 322 people found the following review helpful
4.0 out of 5 stars Collimation Easily Done, April 8, 2011
This review is from: Celestron SkyMaster 20x80 Binoculars (Electronics)
When I received it the collimation was off. Rather than send it back and risk getting another pair that was off, I called Celestron. The "Life Time No Fault Warranty" only applies if you get it from an "authorized" dealer even though my pair was new. Which means you need to pay like $200+ for these to actually have a warranty. However I asked if I could collimate it myself even though the manual says it should only be done by a professional with specialized tools. They could not or would not tell me anything about how to collimate it. Luckily I did find some general instructions on the web and found the prism tilt screws to turn and got it perfect. You need to gently pry back the edge of the rubber hand grips to access the screws. The whole process wasn't even that difficult! I don't know why it has to be such a state secret with Celestron. Since then the binos have been wonderful and well worth the discount of buying from an "unauthorized dealer".
Help other customers find the most helpful reviews 
Was this review helpful to you? Yes No

[Add comment]
Post a comment
To insert a product link use the format: [[ASIN:ASIN product-title]] (What's this?)
Amazon will display this name with all your submissions, including reviews and discussion posts. (Learn more)
This badge will be assigned to you and will appear along with your name.
There was an error. Please try again.
Please see the full guidelines here.

Official Comment

As a representative of this product you can post one Official Comment on this review. It will appear immediately below the review wherever it is displayed.   Learn more
The following name and badge will be shown with this comment:
 (edit name)
After clicking the Post button you will be asked to create your public name, which will be shown with all your contributions.

Is this your product?

If you are the author, artist, manufacturer or an official representative of this product, you can post an Official Comment on this review. It will appear immediately below the review wherever it is displayed.  Learn more
Otherwise, you can still post a regular comment on this review.

Is this your product?

If you are the author, artist, manufacturer or an official representative of this product, you can post an Official Comment on this review. It will appear immediately below the review wherever it is displayed.   Learn more
System timed out

We were unable to verify whether you represent the product. Please try again later, or retry now. Otherwise you can post a regular comment.

Since you previously posted an Official Comment, this comment will appear in the comment section below. You also have the option to edit your Official Comment.   Learn more
The maximum number of Official Comments have been posted. This comment will appear in the comment section below.   Learn more
Prompts for sign-in


Track comments by e-mail
Tracked by 3 customers

Sort: Oldest first | Newest first
Showing 1-10 of 11 posts in this discussion
Initial post: Oct 27, 2013 11:55:07 AM PDT
Too often reviews are either fakes put in by distributors or folks griping about delivery instead of the product itself. With yours, not only did you give us valuable information you even told us how to solve a problem that has apparently shown up for more than one person. Shame on the company for not backing its product no matter who sold it and kudos to you, Gary, for telling us what to do about it.

Posted on Feb 26, 2014 12:04:18 PM PST
Adam Wright says:
Can you share the website (or the instructions) that you used to bring these binoculars back into the correct collimation?

In reply to an earlier post on Feb 26, 2014 6:58:42 PM PST
C. Kian Kok says:
I think he refer to

But according to here, it is not collimating:-

It solve the problem. But unfortunately it reduce the light coming through the binoculars.

In reply to an earlier post on Jun 4, 2014 1:43:51 AM PDT
Last edited by the author on Jun 4, 2014 1:44:54 AM PDT
Briar says:
Thank you for saying, what oft was thought but n'er so well expressed.
Worse, Amazon moniters very closely and blocks where appropriate in its own self-interest.
Let's see this in print Amazon.

Posted on Jun 4, 2014 1:48:01 AM PDT
Briar says:
Great review and many thanks. May I ask what does collimation mean and how do you diagnose it?
Thank you.

In reply to an earlier post on Jul 3, 2014 8:51:39 AM PDT
Last edited by the author on Jul 3, 2014 8:59:21 AM PDT
WakkyWabbit says:

A basic definition for collimation is that both the optics (the lenses) and the mechanics (tubes that hold the lenses) are straight, centered and parallel and everything is in its proper place with proper placement/alignment. This can refer to any devices that uses tubes to hold lenses, including cameras, single/double scopes, complex scopes.

Imagine the cardboard tube that is in the middle of paper towels. This paper towel tube is perfectly straight and the holes on the ends are cut perfectly horizontal to accept lenses. You put a lens on each end but in doing so you accidentally bend a portion of the cardboard on one end. This causes the lens on that end to sit slightly tilted because it is no longer perfectly horizontal. Collimation is now out of line. You fix the bend making the end perfectly horizontal again. You just adjusted collimation by fixing the bent portion. Mechanics were off. Fixing mechanics fixed the optics.

How do you diagnose it? Well, I assume you mean "us." The viewing will be difficult or blurry. This can be all over or just one one side. Sometimes, it will be a little bit difficult to view an object but you can see it briefly but your eyes will start to strain and almost hurt. You will pull your face away, allow your eyes to readjust and view the object again but only briefly before the scenario repeats itself. Your eyes can briefly adjust for small offsets in collimation but not for long. Sometimes you can just look down the barrel/mechanics (inside and/or outside) and see that something is not in proper alignment.

This above a very basic explanation to help you get an idea of what it means. Collimation can be something simple or very complex. Sometimes it requires special tools/machines for adjustment. Sometimes, as in cheap devices, there is no way to reset/adjust anything (the manufacturer did not provide a way to adjust because it is lower end priced). Sometimes it is something as simple as the owner threading the lens on incorrectly.

Hope that kinda helps.

Posted on Dec 16, 2014 3:20:22 AM PST
Lando Han says:
This site works well for these bins

In reply to an earlier post on Dec 16, 2014 3:20:35 AM PST
Lando Han says:

Posted on Jan 24, 2015 6:01:51 PM PST
Cantago says:
Wait, is Amazon NOT an authorized dealer of these binoculars?

Posted on May 25, 2015 6:34:34 PM PDT
Shyam says:
Wow. I just got a brand new celestron 15x70 sky master. And this collimation double vision on the left prism offset was killing me, came across this and solved it immdtly.

Thank you!
‹ Previous 1 2 Next ›