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Celestron Collimation Eyepiece 1.25"
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About this item
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- Celestron Collimation Eyepiece - 1-1/4'' - 94182
- Ideal for precise collimation of Newtonians
- Special eyepiece fits into 1¼" focusers or diagonals.
- Alignment is easy
- Collimation eyepiece is more accurate than the simple Collimation Tool
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The Celestron Cheshire Collimation Eyepiece is ideal for precise collimation of Newtonians and helpful for aligning Schmidt-Cassegrains. This special eyepiece fits into 1¼" focusers or diagonals.Alignment is easy using the small opening on one end and thin cross hairs at the other end. The collimation eyepiece is more accurate than the simple Collimation Tool. Add to CartAdd to CartAdd to CartAdd to CartAdd to CartAdd to CartAdd to CartAdd to CartAdd to CartAdd to CartAdd to CartAdd to CartShow More
Top reviews from the United States
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Insert it where you would normally place your 9mm or 25mm lens. Turn the opening towards a light source, then just look into the end (like you would as if it were a regular lens. You'll see your secondary and primary lens and can adjust them from there.
Good luck on figuring out where those are too. I have the Celestron 130 and was pleased to find I only needed to slightly adjust the 3 large, easy to reach and turn, hand screws on the bottom of the scope.
Update: I forgot to mention that I did use a small flashlight to shine thru the eyepiece cutout while I looked thu the small hole in the back of the eyepiece itself to make adjustments.
Not that it would have mattered because of how loose this thing was, but one of the two small pins that make up the reticle was bent slightly. I was able to nudge it into being relatively straight.
It might not be laser precision but it's more than enough for my reflector. I'm very satisfied with it.
Top reviews from other countries
Very simple to use, aluminium body, robust and comes with a handy case. Considering the cost of some collimation units, this is simple, easy, inexpensive and accurate . Highly recommended.
I first used my telescope without collimation as I didn't have the tool at that time. Star images were irregular. I noticed a remarkable difference after that so stars became more round, closer to the 'ideal' image displayed in the scope manual. Only a slight adjustment of the primary mirror was required. Was surprised to see how much sharper the resolution was. Very pleased with this device.
But you need to check the compatibility with your telescope before ordering! You will recognize there is a problem instantly after inserting the tool and looking through the sight hole. If the tool is incompatible, you will be unable to get a complete view of the secondary mirror. If you do not get the complete view of the secondary, how will you centre and round it below the focuser? A compatible sight-tube type tool is one in which the round porthole shaped field of view as seen at the lower end of the sight-tube, will only just be large enough to fully circumscribe the actual edge of the secondary mirror (i.e. the annular gap will just be perfect enough).
Again, if the porthole is too large, you'll face problems in centring it. The centring & rounding of the secondary is enhanced when using a combo tool that has a narrow annular gap, or halo, between the secondary and the FOV of the tube. It is easier for the eye to centre the secondary in a smaller FOV than it is in larger FOV.