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Solomark Collimation Eyepiece for Newtonian Telescopes and Refractors - Cheshire 1.25"

Product Features

  • 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

Product Specifications

  • Product Dimensions: 9.1 x 7.1 x 1.8 inches
  • Item Weight: 3.2 ounces
  • Shipping Weight: 3.2 ounces
  • Item model number: SKU_QHCE003

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Product Description

The SOLOMARK Cheshire eyepiece has a broad rim on which it rests when it is
inserted into the telescope's focuser. This provides an exact alignment of the
Cheshire so that the collimation result will be accurate even if there is play
between the Cheshire and the focuser. Newtonian telescopes: Insert the
Cheshire like a normal eyepiece into the telescope focuser. Turn the porthole
on the side towards a light source and look into the pinhole of the eyepiece.
Once the crosshair and the reflection of the secondary mirror are concentric
the telescope is properly collimated. Refractors: When looking through the
Cheshire you will see as many reflected discs as there are glass-to-air
surfaces. (Example: An air-spaced doublet refractor will show four reflected
discs, of which usually two are brighter.) Once all these rings are concentric
the telescope is perfectly collimated. A slight misalignment usually is no
problem, however if the rings are drastically excentric then the telescope
should be recollimated. Hands-on Advice by SOLOMARK: When collimating a
refractor you should put the Cheshire directly into the focuser. Do not use a
star diagonal, which in itself might be slightly miscollimated. You will need
to keep the lens cap on the focuser, else the image will be too bright and you
will not see the much fainter reflections. When collimating a Newtonian
telescope we recommend to rotate the telescope until the focuser looks
straight up, and then to insert the Cheshire without locking it. This prevents
the Cheshire from getting tilted slightly out of axis.

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Filed under: Eyepieces & Accessories