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Skip to content Celestron EclipSmart 10 Pack

Apertura Cheshire Collimation Eyepiece

(10+ Available)
Free shipping
SKU: APT-CCE
$42.95

Add Apertura Self-Centering 2" to 1.25" Adapter to your order

$24.95
 
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A Premium, Accurate Collimation Tool for Your Newtonian Reflector!

Apertura is making collimation easier with the premium Cheshire Collimation eyepiece. This cost-effective tool is the perfect accessory for aligning the optics on your Newtonian telescopes! The Apertura Cheshire Collimation Eyepiece (CCE) will help you unlock your telescope's potential at help it operate at the highest level possible. Rest assured this collimation eyepiece will last you years to come with its high-quality black anodized machined aluminum housing. Don't have a Newtonian reflector, but looking for collimation tools? This Cheshire eyepiece is also versatile and will work with other types of telescopes as well!

Collimation is the alignment of the optics or the process of achieving alignment of the optics inside the telescope. The better the alignment of the optics, the higher level of performance your telescope will provide, ultimately resulting in a more uniform view. The Apertura CCE was designed with Newtonian reflectors in mind. In the design process, Apertura wanted a large reflecting surface to give the brightest illumination to the crosshairs and provide a night bright circle of the highest precision possible. The Cheshire Collimation eyepiece fits 1.25" focusers and eyepiece holders. It will also fit 2" focusers when used with the 2" to 1.25" adapter that is included with most telescopes. The step-down adapter is not included with this collimation eyepiece. If you need an adapter, you might consider purchasing the Apertura Self-Centering 1.25" to 2" Adapter.

What Does Our Team Think?
expert photo
  • "Prior to using the Apertura Cheshire Collimating Eyepiece I only had experience with the basic laser-style collimators; as someone who can be a bit of a perfectionist at times, the perceived precision of a laser just ‘spoke’ to me. After getting my hands on the CCE however, I can certainly say that perception has changed! With this tool I’ve been able to achieve the same results as a simple laser - and better, if I spend some more time at it. The learning curve is a bit steeper than a laser, but you pick up the technique quickly, and the improvements Apertura made here to brighten the image and increase precision really help with that process and the accuracy you can achieve."
- Ed B., High Point Scientific Content Writer & Gear Expert

Premium Construction for Premium Function!

The construction of the Apertura Cheshire Collimation Eyepiece was carefully thought through so users could get the most out of the collimation process. The premium features include a large aperture end with stainless steel crosshairs and a long tube for greater accuracy potential. Learn more below.

Using Your Eyepiece with a Newtonian Reflector
The Newtonian Reflecting telescope is one of the most popular telescope designs on the market. A Newtonian reflector uses primary and secondary mirrors to focus and direct light into the eyepiece. The primary mirror is the larger focusing mirror near the bottom of the OTA, and the secondary mirror is the smaller elliptical flat mirror just behind the focuser at the top of the OTA. Once these are accurately aligned, you increase the likelihood that your telescope will deliver it's full observation potential. Check out our downloadable guide in the "Product Attachements" tab or view our Cheshire Collimation Eyepiece Guide Article to learn how to use this handy Apertura tool!

Large Aperture End with Stainless Steel Crosshairs
On the end of the Apertura CCE, there is an oversized large diameter, with a large area reflector (1.125"). The crosshairs are made of bright, large-diameter stainless steel wires. These wires are superior to the commonly used copper wires, as they are more robust due to their thicker size. You will not have to worry about the crosshairs bending with the premium Apertura collimating eyepiece! The stainless steel crosshairs are also bright and easy to see. They are less prone to corrosion, allowing you to use your collimating eyepiece longer. The crosshair cartridge can be removed from the main housing for cleaning or replacement if needed.

Long Tube
Apertura designed this collimating eyepiece with a long tube in order to provide you with greater accuracy potential. This potential is available due to the separation of the crosshairs from the eyepiece's viewing hole. The stop collar is far back on the Cheshire eyepiece, allowing the tube to be inserted deep into the focuser, and providing the best of both worlds when it comes to collimation eyepieces: The long distance between the eyepiece and crosshairs and the ability to have the view port close to the top of the focuser. These two performance capabilities mean you can have a better alignment and fill view when aligning the secondary mirror.

Comes with the Apertura Absolute Warranty!
The Apertura Absolute Warranty provides two years of coverage against product defects. After the initial two-year warranty expires, this product qualifies for Apertura's Three-Year Accident Replacement Program. In addition, the Apertura Absolute Warranty is transferrable! Download a copy of the Apertura Absolute Warranty for more information on this program, how to make a claim, and why it is important to keep your original receipt and the product's original boxes & packaging!