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Solomark Chesire Collimat... has been added to your Cart

Solomark Chesire Collimating Eyepiece Metal Body with Crosshair 1.25 Inch Fitting Short

4.0 out of 5 stars 92 ratings

Price: $18.99 Get Fast, Free Shipping with Amazon Prime & FREE Returns
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  • Special eyepiece fits into 11/4" focusers or diagonals.
  • For aligning optics of Newtonian reflectors, Dobsonian reflectors, and Schmidt-Cassegrain Telescopes (SCTs)
  • Collimation eyepiece is more accurate than the simple Collimation Tool
  • When collimating a refractor you should put the Cheshire directly into the focuser.
  • With Dustproof and MoistProof Rubber Cover-Expert Design-CNC Machine Made- Precise Surface Dealing

Buy it with

  • Solomark Chesire Collimating Eyepiece Metal Body with Crosshair 1.25 Inch Fitting Short
  • +
  • Celestron NexYZ 3-Axis Universal Smartphone Adapter
  • +
  • Celestron - Zoom Eyepiece for Telescope - Versatile 8mm-24mm Zoom for Low Power and High Power Viewing - Works with Any Teles
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Product description

To get the most out of your Newtonian scope you really need to align or collimate the mirrors. It can take some time getting used to aligning both the secondary and primary mirrors and this short collimator can make it much easier. The short collimator for mirror (reflector) telescopes has a 45 degree plate for easier visual accuracy. Collimation is the alignment of elements inside an optical system like a telescope. Colimating a telescope consists of adjusting the tilt and position of the mirrors and lenses to ensure that the focal point reaches optimum focus at the point from which the image will be viewed (the eyepiece or possibly a camera).

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4.0 out of 5 stars
4 out of 5
92 global ratings
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Top reviews from the United States

Reviewed in the United States on May 29, 2021
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1.0 out of 5 stars Poorly constructed
By Dr Mike on May 29, 2021
I wasn't expecting a precision device, but the assembly of this is so poor that I had to comment. About a third of the diagonal reflector was covered in some kind of cement. I think it was CA glue. This made that portion of the image black when attempting a collimation. I tried removing it with mineral spirits, but it had no effect, so I went to acetone and left it to soak . This worked with a bit of scrubbing with a swab. The cross hairs are ridiculously oversized, so when I removed them to clean the diagonal. I left them off. The diagonal seems to be off-axis. Other than letting it soak longer in acetone and trying to remove it to reposition it, I'm not sure how to fix it. So I am just adjusting when I do the collimation and then viewing stars through the telescope to see if they show coma. This is an ingoing process to see if it is even possible with the collimator.
I did make an improvement by wrapping very thin plastic around the opening to better diffuse the incoming light. I am then covering the objective lens with a black cloth and this gives me a nice bright pattern for alignment, but as I said, I'm still undecided if this is actually going to work with the diagonal a bit off-axis. There is no diopter adjustment on the pinhole end, so it is a bit blurry for me as a myope. However, not so blurry that I can't align the optics to the collimator. You may find it easier or harder depending on your eyesight.
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Reviewed in the United States on September 28, 2020
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2 people found this helpful
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Reviewed in the United States on July 20, 2020
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2.0 out of 5 stars I'm no expert, but...
By Sand on July 20, 2020
I'm no expert, but the build quality of this thing is so poor that I'm not even going to waste my time with it. Viewing through the eyepiece, the cross-hair is so blurry, it's almost impossible to see (my camera heroically tried to focus on it, but only partially succeeded), the cross-hair is visibly off-center, and the reflector is very obviously installed skewed from the opening. It also arrived dirty and scratched, so it is possible that it was a previously returned defective item. Returning this piece of junk and looking for something else.

Sand
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Reviewed in the United States on February 8, 2017
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Reviewed in the United States on April 15, 2016
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6 people found this helpful
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Reviewed in the United States on January 31, 2019
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Reviewed in the United States on September 9, 2018
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Reviewed in the United States on January 11, 2021
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Top reviews from other countries

Steve-O
3.0 out of 5 stars The crosshairs are very fine copper wires at the back end of the tube
Reviewed in Canada on June 22, 2016
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3.0 out of 5 stars The crosshairs are very fine copper wires at the back end of the tube
Reviewed in Canada on June 22, 2016
This is my review for the Solomark cheshire collumating tool. I bought this tool because I recently acquired an old Newtownian Reflector and knew it needed to be dismantled, cleaned, assembled and collumated. There are a few ways to determine if your scope is collumated but for the cost of this tool it's worth having in your kit. Just moving your scope around or bouncing in a car is plenty enough vibration to throw off your collumation. Now to the product. The product itself is well made, the body is black anodized aluminum, there is a polished metal insert slanted 45 degrees with with a hole in the center that allows you to see inside the shadow of the secondary mirrror. The crosshairs are very fine copper wires at the back end of the tube. Aside from that there is a decent rubber eye cup and it helps to get your eye right up close to really see the alignment.

I found three small problems with this product. #1, no instructions. Even though this is not an expensive tool there is zero excuse for not providing any instructions. There is nothing in the small box it comes from and nothing online that I could find. Others have pointed out that there are competitor products that have instructions available online (Google "Crestron Collumator") but there are none for this product and you should always follow the manufacturers instructions for the specific product they make. #2, the outside dimension of the part of the tool that fits in your telescope is 1.275" and my telescopes focuser bore is 1.28". This does not seem like a lot but it allows slop of the tool inside the focuser, if you tighten the focuser eyepiece retention screw you will skew the tool even more. I'm not sure what the nominal size should be and/or if this is in the acceptable range for most telescopes but I do know your results will be poor if you have any slop. My solution to this was to wrap the bottom part of the tool (the part that fits in the focuser) with one wrap (end to end, no overlap) of scotch tape (the opaque disappearing kind). This is enough of a shim to reduce the fitment issue to almost nothing. You will want to do this right away before you spend time collumating only to realize it was probably worse than when you started due to the tool being crooked. #3, The cross hairs should be square if you hold the tool with the polished 45 degree reflective flat straight up to the sky and they are not. Not a huge deal as you only need a bit of light entering the hole in the reflective flat so you just rotate the tool in the focuser barrel to get the crosshairs square but if you look at the other tools out there the crosshairs are square with the reflective flat facing up which is logical.

PRO TIP: I would start by making sure your secondary is in the center of the tube and the primary. This can be done very easily by mounting the tool, and then covering the open slat in the center with tape (I used black electrical tape, see photo). This blocks the view of the primary completely and allows you to center the secondary mirror housing. This is an item that should be on the instructions, and it is not part of the Celestron instructions. Another way to do this is insert a piece of paper in the telescope tube between the secondary and the primary which will block the primary. Taping the tool is much better and easier. Another pro tip is to rotate the tool so that the crosshairs are lined up. The horizontal crosshair should line up with your horizontal secondary mirror spiders or single holder if your telescope has that, this makes it much easier to line up and square everything in your view. Good guides for collimating can be found online.
If you found this review helpful please mark it as being helpful, thanks!
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Adam Berry
5.0 out of 5 stars Great collimation tool..
Reviewed in Canada on July 16, 2019
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5.0 out of 5 stars Works great.
Reviewed in Canada on July 20, 2016
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2 people found this helpful
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Andrei B.
5.0 out of 5 stars Five Stars
Reviewed in Canada on June 18, 2016
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2 people found this helpful
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