Celestron Cheshire Collimation Eyepiece for Reflector & SCT Telescopes

THANKS GREAT ITEM

Using this collimator to align the mirrors in a reflector scope is a must-have item. After the procedure, images are crisp and clear across the field of view, even with my relatively small (3" F9) Celstron reflector. Frankly the instructions for me especially as a first time user are not easily understood, especially in discerning between various images seen through the eyepiece. I researched "collimation" on the web, and pieced together sufficient info to understand all the images fairly well. Also placed a small, stick-on center dot on the main mirror for convenience during alignment. Definitely recommend this eyepiece - quality built for the money - it will be used periodically to keep the scope in tune, and it can be used as one graduates to larger reflector scopes. I never tried a laser collimator, but with the excellent results from this piece, not sure that a laser is necessary, at least with an F9 scope - perhaps it might make a difference on an F5 or lower, just guessing.

I purchased this to help with the collimation of a few telescopes I have, thought it would improve the process. Was hoping to be able to take this out of the package and with a few directions it would be a simple task. Unfortunately the directions were a little hard to follow for the first timer that I felt like I was. After finding some internet help, I was able to Collimate my scopes and the tool does make it a simple process. I shared this with some of my friends who have experience in this. They found the eyepiece to be very helpful. If you know what you are doing it is out of the box great, if you are a novice like myself it takes a little playing. While I ultimately managed to complete the process, it was a little frustrating at first. If you are planning on transporting your scope regularly, I would recommend this tool. When finally completed, it did a great job.

We recently purchased a Celestron AstroMaster 130EQ telescope for my son's 10th birthday. While the moon looked great in the 'out of the box' configuration, we noticed that Saturn and Mars looked, well, 'fuzzy'. My initial thought was that we needed a more powerful eyepiece than the 20mm and 10mm ones that came with the telescope. A couple of weeks later, we attended an open house the observatory on the campus of the university that I work for. We were visiting with one of the astronomy professors and I described our 'problem' we were having with our new telescope. After finding out that it was a Newtonian, he immediately asked if I had collimated the telescope. Naturally, I had no idea what he was talking about, so I set out to Mr. Google to learn about collimation. After a little research, I ordered this eyepiece and was amazed at how much adjustment we needed to make to bring the mirrors into proper alignment. In less than 30 minutes, I had the telescope fully collimated and now distant objects look MUCH more crisp. My son and I even got up early one morning to see Venus and Jupiter, and both of those appeared crisp/sharp. Venus was in a crescent phase and we were able to see Jupiter and two of its moons, and this made for one happy 10 year old! So, I would recommend this to any beginner/novice astronomer like myself and my son.

Great tool to collimate your newtonian, it takes some trail and error, but once you get the hang of it is a breeze. If you have a Bird-Jones telescope like me (short tube newtonian reflector telescope that have a lens at the end of the focuser) you can't really use a laser to collimate (unless you use the aspirin cap method which makes the laser less accurate) so this is a good and cheaper alternative for it. If you learn to collimate a Bird-Jones telescope you will probably be able to collimate any newtonian. And yes you can collimate at night just shine a smal light into the side opening. Good tool overall.

Maybe this is not recommended to collimate a RC telescope, but it worked for me and with the simple design there is nothing needed to check the accuracy of this eyepiece.

It’s built well, I’ll give it that. I’ve never successfully used it, however. I’m guessing it’s operator error, but the instructions are not good. One day I’ll take the telescope and this contraption to someone smarter than me and I’ll figure out how to do it.

Very well made. I bought this to have one more way to collimate our telescope. I tested collimation with the ring around a star and with the cheshire and had the same results.

Quality is good. The wires that form the X on mine were about a 1mm off center, but you can try bending, although im hesitant to do so, afraid of breaking them off. But most importantly, it does what supposed is supposed to do, which is to center the secondary in the focuser, collimate the tilt of secondary and primary. If this is your first collimation device, then this is what you need. Dont buy a laser first, youll mess up more than fix your accuracy.

Perfetto per collimare tutte le parti del telescopio riflettore: focheggiatore, specchio secondario, specchio primario. Naturalmente occorre saperlo utilizzare a dovere, ma una volta presa confidenza con esso, è veramente preciso. La collimazione dello specchio primario, la più frequente, è un attimo.

Muchas Gracias, llego en excelentes condiciones y en el tiempo estimado. Le quedo perfecto al telescopio Celestron 76EQ, al principio fue complicado collimar ya que es el collimation es el básico(sin láser) pero con unos cuantos tutoriales ya le vas entendiendo, pero si buscas comodidad, es mejor el laser

Made from quality materials does exactly as a state recalibrates the eye peace

Après avoir réalisé la colimation sur tube newton le résultat est parfait. Environ 30 minutes pour un réglage optimal. Beaucoup plus efficace qu'un colimateur lazer.