Citronic

1.25'' Cheshire Collimation Eyepiece with Crosshair for Newtonian SCT Telescope

Description: 1.25'' Cheshire Collimation Eyepiece with Crosshair for Newtonian SCT Telescope Features:1. The collimating eyepiece for accurate alignment of any Newtonian reflector telescope mirrors, ideal for ensuring the best optical alignment. 2. Accurate collimation is essential for ensuring the best performance from reflector telescopes, this quality easy to use eyepiece is the recommended way to achieve this. 3. Peephole in top and crosshairs at bottom enable precise alignment of reflector optics. 4. Precision machined from aluminum with fine crosshairs and a clear bright mirror with sighting hole.5. Fits in 1.25" focusers, anti-rust, wear-resistant and durable.6. Type: Cheshire Collimating Eyepiece7. Connection Size: 1.25"8. Fit: Newtonian and SCT reflector telescopes9. Body Material and Processing: Aluminum & CNC10. Crosshairs of Material: Steel11. Net Weight: 145g12. Dimension: 143*41*41mm13. Note:This collimation aid is also useful for aligning refractor optics very accurately.Package Includes:1 Piece Collimation Eyepiece1 Piece Dust Cover 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. 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. Using the Collimating Eyepiece Collimation can be performed in daylight, when it is easier to see what you’re doing. However, never point the telescope or the cutout side of the Collimating Eyepiece at, or anywhere near, the Sun, or serious and instant eye damage could result! Insert the Collimating Eyepiece directly into the 1.25" focuser. When using a 2" focuser, place the Collimating Eyepiece into a 1.25" adapter. If you use a star diagonal with your telescope, as is common for Schmidt-Cassegrain telescopes, remove it before inserting the Collimating Eyepiece. 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. 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. 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. Collimation of Refracting Telescopes If you use the eyepiece for checking the collimation of a refracting (lens) telescope, then you will see as many reflections as there are lenses in the telescope. If all the reflections are round and centred, then your telescope is well collimated. Care and Maintenance Since there are no lenses in the Collimating Eyepiece, care and maintenance is minimal. It is a good idea to remove any obvious dirt on the inside or outside of the eyepiece so that the dirt does not get into the telescope tube during the collimation process. To clean the eyepiece, use a blower bulb or a moist cotton swab to remove dirt from inside the barrel, and simply wipe the outside with a damp cloth. Make sure not to disturb the crosshairs, as bending or breaking may result. Package Includes: 1x Cross Calibration Eyepiece

Price: 21.59 USD

Location: Zhengzhou

End Time: 2024-02-07T13:41:58.000Z

Shipping Cost: 0 USD

Product Images

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Item Specifics

Restocking Fee: No

Return shipping will be paid by: Buyer

All returns accepted: Returns Accepted

Item must be returned within: 30 Days

Refund will be given as: Money Back

Return policy details:

Brand: Unbranded

MPN: Does Not Apply

Country/Region of Manufacture: China

Type: Eyepiece Set

Features: As described

Item Diameter: 1.25 in

Focal Length: As described

Compatible Brand: Universal

Telescope Type: As described

Compatible Series: Universal

Compatible Model: As described

Unit Quantity: 1

Unit Type: Piece

Material: Metal

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