Laser Collimator for Newtonian Dobsonian Marca Telescopes, Telescope Alignment 1.25 Inch 7 Bright Levels with 2 Inch Adapter, Great Telescope Accessory Laser Alignment Tool for Collimation

Works great and user friendly. Has not lost its own collimation yet but when and if it does it is very easy to reset. I would buy again!

Great quality tool. Came with battery and clear directions. Made collimating my 10” Dob seamless and accurate as it has ever been. Will be keeping and using for a long time!

I’m glad I bought this, my telescope was out of alignment, no one tells you this but this is a must have to get optimum use. Very easy to use and if you go the wrong way it’s very easy to go back.

I purchased this collimator, but was surprised that it did not include a battery. After reading the fine print on the Amazon website, I found that a battery was not included. After finding a CR 2032, I tried to install the battery, but found it was a hard fit. The retaining ring was very tight, and made it hard to screw down the battery screw plate. The paper work that came with the collimator did not indicate the battery type. Except for the battery problem, I found that the Laser Collimator work in collimating my 6 inch Celestron DOB. The adjustable laser brightness worked well with a setting of 3.

I have a 1981-vintage Odyssey 1 dobsonian scope and I've never used a collimation tool before on it. I knew it was not aligned very well, and I'm very surprised how quickly I was able to get the laser dot centered - it was like a minute and a half! The collimator fit the eyepiece mount properly and it was easy to angle it back so I could see it from the back of the scope. Then it was a simple and quick operation to use the setscrews to get the dot centered. It was so easy I'm planning to keep the collimator with my eyepieces and collimate every time I use the scope (which, since the mirror gets installed for every session then removed for storage after, will make for optimum performance).

When this arrived, I was super excited to collimate my Newtonian that arrived slightly out of collimation. Being a perfectionist, I wanted it perfect so order this, and got to work. It had me make pretty significant changes to the collimation. I took my scope outside and it would no longer focus. At ALL. I then rushed to the internet and learned that you have to check the collimation on collimators BEFORE touching your scope because sometimes they're very very off. Mine was *very* off. There's a great youtube video about how to do it. Search for "collimate a laser collimator" and it's the one posted by MikeyJ. You'll have to make a little device to hold the collimator in place before you can collimate it. And the rubber that's over the allen screws is really awful to get out. Once you've done that, you're in business. After much frustration I learned you have to loosen one side and tighten the other to make adjustments. It took me the better part of an afternoon to really figure out how to do it but once it got it close, it was really easy to get the collimator perfectly collimated. I then used the video from Astronomy and Nature TV about collimation to complete the task of collimating my scope and all is right in the world again.

Device appears to be sturdy and well-made. The CR2032 battery was easy to install, and the laser itself was easy to use. I installed it in the 1.25" eyepiece slot on my 6" Orion Dobsonian, following the guidance from Orion's YouTube video on how to do laser alignment with their telescopes. I had never collimated my telescope before. Despite being badly out of alignment, the process only took a few minutes to align the primary and secondary mirror. It's so easy I will definitely just check the mirror alignment every time now before using the telescope. If there is one nitpick, it is that I did not find the paper instructions included that helpful on their own. But combined with the Orion YouTube video, it was very straight forward.

It works perfectly....

Es robusto, está bien acabado y bien colimado, genera un haz láser puntual y bien formado. Tiene una escala de 7 niveles de potencia, pero los primeros son débiles y muy parecidos entre sí y los últimos son potentes también muy parecidos entre sí, pero aun así hay suficiente variedad de intensidad donde elegir. Ha superado mis expectativas para su precio, es un instrumento bastante fiable e inimprescindible a la hora de comenzar cada sesión, en un par de minutos tengo mi telescopio "fino fino" Lo recomiendo

Got the item in good condition

Instrumento de gran utilidad q facilitó la búsqueda de todo

I bought this to align my 130mm Skywatcher I picked up on Craigslist. I found that the unit works just as described and I found it very easy to use. But then I calibrate microscopes for a living. I can't imagine that anyone couldn't figure out how to use this very simple calibration tool. I also can't imagine how you can use your telescope without knowing if its mirrors are aligned properly. My only gripe is I wish they would tell you in the instructions what type/size battery it takes. You can youtube all kinds of videos on how to use it.

軸の位置は簡単に調整が出来ました。 やはりレーザの光良いですね。