Astromania 1.25Inch Metal Collimating Cheshire Eyepiece Without Laser for Newtonian Reflector Telescope - Short Version

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Astromania 1.25Inch Metal Collimating Cheshire Eyepiece Without Laser for Newtonian Reflector Telescope - Short Version

Regular Price: US$55.00

Special Price US$39.99

Availability: In stock

Supplier: Astromania

Category: Electronics Camera & Photo Accessories Telescope & Microscope Accessories Telescope Accessories Eyepieces

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Purpose of the Collimating Eyepiece

Aligning the mirrors seems easy enough, in theory, but in practice it can be difficult without the proper tools. A common way of collimating—the "quick and dirty" method—is to simply remove the eyepiece and look down the focuser tube to center the mirror reflections. The accuracy of this method, however, is not reliable. For one thing, there is no way to know whether you are looking straight down the focuser tube; your line of sight could be off by a degree or two. Another problem is knowing when the reflections of the mirrors are exactly centered. Just "eyeballing it" isn't precise enough; The reflections may appear to be centered when in fact they are not.

The Collimating Eyepiece will take care of both of these problems, allowing you to achieve precise collimation without "guessing," and thus improve your telescope's performance. The Collimating Eyepiece is a combination of a "sight tube" and a "Cheshire eyepiece. " The sight tube's narrow field of view and crosshairs provide a reference for centering the optical elements during the collimation process.

Using the Collimating Eyepiece

Insert the Collimating Eyepiece directly into the 1.25" focuser. When using a 2" focuser, place the Collimating Eyepiece into a 1.25" adapter. The eyepiece should be inserted to a depth such that the bottom edge of the eyepiece tube appears slightly wider than the outer edge of the secondary mirror when you look through the sight hole. Rotate the eyepiece so that the cutout side is directed toward any available external light. Make sure there is adequate light in the room or outside so that when you look through the sight hole, you can see the edges of the secondary mirror clearly. Tighten the thumbscrew on the focuser tube to secure the Collimating Eyepiece in place. Now, you are ready to proceed with collimation.
It can be used after being inserted into the eyepiece tube. Sight down the tube and note the crosshair target. Center the First Mirroe (diagonal in a Newt, secondary in a CAT) on the crosshair, and adjust its tilt until the bright ring the collimator is producing is centered in the reflection. Next, adjust each successive mirror in the scope so that the image of the ring is concentric with the optic.

Collimation is the process by which an instrument's optical components are brought into precise alignment with its optical axis and mechanical axis. In other words, all the mirrors and/or lenses should be centered and angled so that light entering the telescope forms a sharp image precisely in the center of the eyepiece. If the optics are not properly aligned, stars will appear not as pinpoints as they should, but rather as flared, teardrop-shaped "comets" or "sea gulls."


The approximately 63mm long aluminum tube is a combination sight tube and cheshire eyepiece. Peephole in the top and wire crosshairs at the bottom allow quick and precise centering of the optics. Fits in 1.25" focusers or in 2"-1.25" adapters.	Made of high-quality metal aluminum, with dustproof and moistproof rubber cover-expert design-CNC machine made- precise surface dealing the surface is anodized, rust proof and durable.	A Cheshire eyepiece has a polished flat set in the barrel at a 45° angle, which directs light entering from a cutout in the side of the barrel down into the optical path. The Cheshire allows quick and easy collimation of the primary mirror, assuming the mirror has been marked with a spot exactly in its center.

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This collimation eyepiece can be used for precisely collimating the Newtonian and Schmidt-Cassegrain reflector telescopes for better image quality. Item was made by aluminum with crosshair at the bottom allow quick and precise centering of the optics. The short collimator for mirror (reflector) telescopes has a 45 degree plate for easier visual accuracy. For aligning optics of Newtonian reflectors, Dobsonian reflectors, and Schmidt-Cassegrain Telescopes (SCTs). Fits in 1.25" focusers and easy to use;simply cap the telescope, remove the diagonal, and place the eyepiece directly in the focuser.

Item Weight: 3.1 Ounces. Finderscope: Reflex. Product Dimensions: 6"D x 1.3"W x 1.3"H. Telescope Mount Description: Altazimuth Mount. Objective Lens Diameter: 1.25 Inches. Brand: Astromania. Manufacturer: Astromania. Date First Available: March 25, 2016. Is Discontinued By Manufacturer: No. Best Sellers Rank: #15 in Telescope Eyepieces. Customer Reviews: 4.4 out of 5 stars 194 ratings 4.4 out of 5 stars. Item model number: SKU_AM_MCES1. : B01DEW8VLA. Item Weight: 3.1 ounces. Product Dimensions: 6 x 1.3 x 1.3 inches.