Telescope Laser Collimator 1.25inch, Bysameyee Calibrator with 2’’ Adapter for Newtonian Reflector Telescope Collimation

As other reviewers noted, this came out of alignment. Also as others have stated, it was loose in the 1.25 inch focuser. I put some teflon tape around the barrel to make it a snug fit (not the pipe thread type). Then had to dig out the rubber cover on the alignment screws. The alignment process is predictable but not clean as there is no spring loading so one must back out one screw to tighten another. Not a surprise. One thing was that one of the alignment screws was very loose at the start. It clearly had never been adjusted.Once it was aligned, using it to align the scope was amazingly easy. The instructions really didn't say anything about adjusting the secondary mirror but that was mentioned in another review, one gets the dot in the center of the center mark on the primary mirror.If the manufacturer is not going to properly align these, they should not cover the alignment screws and should provide instructions for alignment.

Lasers make everything more exciting!The collimator has a variable brightness beam (1-7 and off), adjusted by turning a ring on the end of the casing. At higher powers it makes collimation possible during daylight, however the beam gets distorted to more of a short line than a round dot beyond the 3rd to 4th setting. At lower powers it is perfectly round.The beam is almost perfectly aligned, with just the faintest edge appearing on white target screen, however the adjustment ports have been sealed up with rubber. Someone more daring could probably align it perfectly with a hobby knife and a steady hand.The collimator runs off a CR2032 battery which is included, along with a 1.25 to 2-inch adapter for owners of 2-inch focusers.

Aparato es metálico, igual que el adaptador.Incluye bateria.El envío fue rápido.

the first collimator had a defect (was not calibrated). The seller reached out since I was not happy and replaced it. The second one was perfect and looks to be a great tool to do the job. It is easy to test the accuracy of a collimator; roll it on a desk that is flat and observer the laser light, make sure it does not dip up or down, if the light is always on the same horizontal plane it is perfect.

The telrad is an excellent piece of equipment. Although I have not mounted this on my telescope I have used it to make sure it is working.

For years I’ve been using my telescope with the equivalent of astigmatism. But I didn’t know it. Then I bought this awesome, little tool. With it, I was able to figure out that the telescope mirror was out of alignment. I used the this device and easily corrected the issue I never knew I had. After that, the planets and stars were noticeably sharper. It was a game changer. This simple, quality device will change your view of the universe. Literally.

So a laser collimator is a fantastic tool to have for aligning a reflector. This one worked great for a couple times but then I noticed that the laser would change positions by bumping the collimator. When rolled on its side or twisted in the eyepiece holder the laser would rotate around. I did play around with it and got it centered but it was throwing things off when I didn’t realize what was going on. So useful very! Does it work? Yes. Does it get 5 stars… no. So check yours when you get it and be certain the laser stays in the same spot no matter how you twist the collimator in the eyepiece holder. Good luck and I hope I got the only bad one.

Very nice product which had my 8" Dobsonian tuned up in no time. Easy to use, and the multiple brightness levels of the laser make tuning easy in brighter or darker locations. Very heavy product for its size, which tells me this is built to last. I cannot recommend this enough. The 2" adapter is also of very good quality, and again, very heavy for its size.

I bought this for £30 which compared to other laser collimators is cheap. With this in mind to get 5 stars I asked 2 questions.1. Does it produce a laser?2. Can I collimate it?The answer to both is a yes and whats more you have 8 different levels of brightness that you can use.Like others have found this laser was not collimated when it arrived. To be fair I wouldn't expect it to be. If you are not willing to collimate this yourself then don't buy any laser collimator. In fact I would say go one step further and say buy a refractor because maybe collimation in general is not for you. It is a fiddly job getting this right and you will need to make a "Jig" but there is plenty of advice online with YouTube videos telling you what to do.You will need a x2 Barlow, a Cheshire collimator and maybe a collimation eyepiece to complement this product.Another point people have made is that the collimation screws are covered and you have to dig them out. I must admit this is a negative and I would have given less than 5 stars should the price have been any higher than it is.Do your homework and know what you are getting into before buying. Unless the laser doesn't work or the collimation screws are broke you have nothing to complain about.

I bought this for my Celestron Astromaster reflector 130Eq with a 1.25" eye piece.I placed it in the eye piece and tightened the nuts for the collimator to do its work and noticed the laser was miles off.I adjusted the mirrors and moved the laser dot and eventually it was in the middle. Perfect.I called my wife to show her as she sometimes uses it, removing the collimator to show her how easy it was to put in, and tightened the screws....The collimator was off againIt rattles inside the eye piece, not a massive amount but enough so that the laser is easily moving around and you can show the collimation is perfect one minute, take it out and out it back in again and it shows the laser miles off the middle.I checked online to find videos show this is and issue.Returned.

Ok , so there are two schools of thought regarding these laser collimators . One is that they are easy to use and make the job of collimating a breeze . The other is that they are not very accurate as sometimes the collimator needs collimating ! Fortunately , mine was well collimated in the factory .. maybe a bit of luck but I found it quite accurate. So , all in all I have a good example . If you do have to collimating the collimator then things get more tricky . It’s all about adjusting three tiny screws ! But that’s a subject for another day !

Do not buy this collimator unless you are prepared (in violation of the warranty?) to recalibrate it. This was the second I had bought, the first being faulty from a different seller. The setting was way out and I had to adjust it by digging out the rubber fillings for the adjusting screws. I think they should leave the seal open if they can’t guarantee the correct setting. Again NOT what I expect from an Amazon seller. Also it seems Amazon does not allow me to contact the seller - either you accept the problem or return the item.

First, the collimator was not collimated itself, therefore I had to uncover the sealed screws to collimate it myself.Second, the body of 1.25 in is smaller in diameter and you cannot find a fixed position that will get it centered. (The manufacturer should have checked the tolerance used by the 1.25 in eyepieces when designing such device.)Third, the beam is quite wide and even collimated does not go central.Just as well I did not trust it and I did not change the actual collimation of the telescope; I waited for a clear night sky and I checked the collimation of the telescope using a star. If I used the collimator I would have messed up completely my telescope.