Farpoint 2 Inch Cheshire Collimator

(2 reviews)

$40.00

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Farpoint 2 Inch Cheshire Collimator is a simple tool that helps align the optical axes of the mirrors of a Newtonian reflecting telescope, a process called collimation.  This precision-machined alignment tool for 2″ apertures is practically indestructible and requires no batteries. For Newtonian Reflectors only.

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Farpoint 2 Inch Cheshire Collimator

Farpoint 2 Inch Cheshire Collimator is a simple tool that helps align the optical axes of the mirrors or lenses of a telescope. This is a process called collimation.  This precision-machined, red anodized alignment tool for 2″ apertures is practically indestructible and requires no batteries.

A Cheshire eyepiece or Cheshire collimator consists of a peephole that is inserted into the telescope focuser in place of the eyepiece. Ambient light falls on the brightly painted oblique back of the peephole. Images of this bright surface are reflected by the mirrors of the telescope and can thus be seen by a person peering through the hole. A Cheshire eyepiece contains no lenses or other polished optical surfaces. For Newtonian Reflectors only.

Includes a mirror spotting template and triangle center spots to help simplify the process of center spotting a primary mirror.

Why is collimation even necessary?

Telescopes, like cameras, have an optimal position that gets the sharpest rendering of an object. That position is called the focal plane. The problem is that your telescope’s mirror produces its sharpest images only at the center of the focal plane. So, you want to be sure that’s the part of the image you’re magnifying with your eyepiece. If instead, you aim your eyepiece slightly away from the center of the focal plane, the image will be blurred somewhat by a nasty optical aberration called a coma. Not Collimating your scope will have details become lost as you are processing your images. 

This is why you want to collimate your scope — To Get the Sharpest possible image from your rig

  1. Royce Kessler (verified owner)

    Simple tool, perfect execution. I suggest you purchase with the laser as a set.

  2. Mitchell Tubbs (verified owner)

    The description says that this is for Newtonian Reflectors only. This is a lie. I also use it with my 8″ RC telescope, and it works amazingly well for getting the collimation close enough so visual observing is possible. I use lasers to dial it in a bit more for astrophotography. In fact, I have found that it’s nearly impossible to get the laser collimator to give an accurate collimation without first using a Cheshire eyepiece like this. I have yet to try this on my SCT, but if it works on an RC, I suspect it would also work well on the SCT.

    Bottom line, I recommend this Cheshire eyepiece collimation tool if you need one for an RC telescope (and you should).

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Package Includes:

  • 2″ Cheshire Collimator
  • Mirror Spotting Template
  • Center Spots