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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 drasti

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