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Orion Collimating Telescope Eyepiece
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Orion Collimating Telescope Eyepiece
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  • Economical collimation tool ensures that your reflector telescope's optics are in precise alignment
  • Combination 5" long sight tube and 1.25" Cheshire eyepiece
  • For aligning optics of Newtonian reflectors, Dobsonian reflectors, and Schmidt-Cassegrain Telescopes (SCTs)
  • Peephole in top and crosshairs at bottom enable precise optical centering
  • Compatible with 1.25" telescope focusers or 2" focusers with a step-down adapter for using 1.25" accessories


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Item #  03640
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To get the best images from your telescope, its optics must be in precise alignment. This economical tool will ensure that they are.

The Orion Collimating Eyepiece is a combination sight tube and Cheshire eyepiece, consisting of a 5"-long tube made of black-anodized aluminum. It fits in a 1.25" eyepiece holder. A peephole in the top and wire crosshairs at the bottom enable precise centering of Newtonian optical components. The polished 45-degree internal surface projects an annulus of light into the optical path to facilitate primary mirror alignment. Simply insert the Orion Collimating Eyepiece in the focuser drawtube and follow normal collimation steps.

Your Newtonian telescope will always be in excellent optical alignment! Instructions included.

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Orders received by noon Pacific Time for in-stock items ship the same business day. Orders received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

Reviews
Orion Collimating Telescope Eyepiece
Rating??
4 / 5
4 / 5
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Rating Breakdown 7 Reviews
5 stars
3
4 stars
3
3 stars
0
2 stars
0
1 star
1
Quality??
4.3 / 5
4.3 / 5
Value??
4.2 / 5
4.2 / 5
5 out of 6(83%)customers recommend this product.
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7 For the best images from your reflecting telescope, the optics need to be in precise alignment (also known as collimation). The Orion Collimating Eyepiece is an economical and accurate way to ensure perfect Newtonian mirror alignment every time.
Rating??
4 / 5
4 / 5
Open Ratings Snapshot
Rating Breakdown 7 Reviews
5 stars
3
4 stars
3
3 stars
0
2 stars
0
1 star
1
Quality??
4.3 / 5
4.3 / 5
Value??
4.2 / 5
4.2 / 5
5 out of 6(83%)customers recommend this product.
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Ratings summary
Rating??
4 / 5
4 / 5
Open Ratings Snapshot
Rating Breakdown 7 Reviews
5 stars
3
4 stars
3
3 stars
0
2 stars
0
1 star
1
Quality??
4.3 / 5
4.3 / 5
Value??
4.2 / 5
4.2 / 5
5 out of 6(83%)customers recommend this product.
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Product ReviewsWrite A Review
Rating??
5 / 5
5 / 5
A Great Collimating Tool
PostedDecember 6, 2008
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Randy S
 
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After dealing with the frustrations of using a cheap laser collimator on my 12" Dob, I decided to explore a different method and thus bought this combo collimator. Once I learned how it worked it is very easy to use and is versatile in that with a small LED flashlight, it can be used in total darkness. Extremely accurate I highly recommend it
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Rating??
4 / 5
4 / 5
Great for secondary mirror
PostedJanuary 13, 2012
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Clay C
 
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Owned this product for:Less than 3 mos
Quality??
4 / 5
4 / 5
Value??
5 / 5
5 / 5
I purchased this after realizing that with the collimation cap that came with my xt8, I could move the secondary mirror a considerable amount without really being able to tell which position it should be in. Once I placed the new collimation piece in, I knew exactly where the secondary should be.
The cross struts in the eyepiece can be overlaid on top of the spider cross struts to better see where the center is. The only thing is, your eyes can't focus on both at the same time, so one has to be blurry while the other clear. Because of this, you also still need the small collimation cap for the primary mirror.
I would really recommend buying the precision centering adapter, as the eyepiece is a bit small in the focuser tube, and with jiggle noticeably with the set screw. Otherwise, this is a great tool for your telescope.
Favorite viewing location:??Lake Claiborne
Favorite object to observe:??Whirlpool Galaxy
Yes, I recommend this product!
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5 / 5
5 / 5
No need for a laser collimator
PostedOctober 19, 2011
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BarryE
 
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  • Top 25 contributor
Quality??
5 / 5
5 / 5
Value??
5 / 5
5 / 5
I started with a laser collimator, but then switched to this simple (and cheap) alternative. Granted, you'll need to know how to use it and it may take a little practice, but once you get the hang of it, you should have no problems. I can collimate my 8" reflector in a few minutes using nothing but this tool.
Yes, I recommend this product!
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Rating??
4 / 5
4 / 5
sturdy and simple tool - best for "slower" (long f/ratio)
PostedOctober 15, 2011
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Dumbbell Nebula
 
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from??Nevada
Owned this product for:Over 1 year
Quality??
5 / 5
5 / 5
Value??
4 / 5
4 / 5
I bought this tool with a 10-inch f/5.6 Orion sonotube Dobsonian and relied on the collimation tool for a couple of years. I checked collimation before night fell or used a flashlight to illuminate the 45 degree side window of the tool. With this size scope I had to look, then reach down to adjust the mirror, then look again, and that worked fine. The "premium deep space explorer" had a 2-inch helical focuser and the collimation eyepiece fit pretty snugly in the 1.25-2 inch adapter, so alignment of the tool never seemed to be a problem.
I liked the simplicity and rugged build of this tool. Faster Newtonians may need more elaborate colllimation tools (or sets of tools) but certainly at f/6 or slower (e.g. f/8) this will do the job well. This exact tool has been around almost 20 years, for good reason.
Favorite viewing location:??backyard, local dark sky
Favorite object to observe:??moon and brighter DSO
Pros: all metal very rugged, simple but effective
Cons: may need more tools for fast scopes
Yes, I recommend this product!
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