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Your cart is empty. 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
Jack Lathrop
Reviewed in the United States on August 19, 2024
From what i could find on line, this product does not work well with SCT's. Videos show that it would work pretty well with Newtonian's The advertisement says it works with SCT's but doesn't. If it does. They should make a video to show how it's done.
me4ku
Reviewed in the United States on August 30, 2023
Did not work on Orian 6" EQ, inaccurate , vinified with Orian eyepiece, had to buy a shorter version to 3"this worked great SVBONY SV197
Robin Smith
Reviewed in the United States on August 14, 2023
The device arrived without instructions, but it is fairly simple to figure out. I was able to collimate my 8" SCT in just a minute, or two without any special set up or other tools. If you need to collimate your scope, I would recommend this instrument.
Chris
Reviewed in the United States on February 1, 2023
So far I find it very useful to use. I used a laser at first and thought my collimation was “spot on” and when I set this up man was I wrong. I was so off it’s not even funny. This got me perfectly set up and focus is now pin point and tack sharp
VJD
Reviewed in the United States on February 4, 2021
Used tool to double check my Farpoint laser. Both agree and compliment each other. Repeatable and consistent results. Used on 6 inch F6 GSO Newtonian telescope with 2 inch Crayford style two speed LRB focuser.
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