SVBONY Red Laser Collimator for Newtonian Reflector Telescope Alignment 1.25' 7 Bright Levels Triple Cemented Lens with 2" Adapter

It’s unfortunate that this laser collimation has 2 problems: 1. The laser beam is not collimated, it traces a circle when I rotate it. 2. The diameter of the collimation is slightly smaller than the diameter of the telescope focuser, this size mismatch is enough for the laser collimator to fit slightly differently each time you attach it to the focuser therefore it provides different results each time. Sure you can spend time and fix these defects by collimating and calibrating the laser beam using the screws on the sides and put a layer of tape on the collimator neck to make it fit snugly in the focuser, but when I buy a tool I expect it to perform and function properly right out of the box. I don’t expect to spend additional time and effort to fix the tool to be usable.

Got mine few days ago, couldn't be more happy with the quality and easy of use. Highly recommend

I also was required to calibrate this collimator, with no success. First of all, digging out all the rubber from the adjustment ports is a pain in the arse, as well as shows a little overconfidence in the factory’s calibration (more likely covered so the screws don’t fall out and get lost). Second, one of my adjustment screws had zero effect when screwing it all the way in or out. I was not able to correct mine and I’m not sure if I can return it now. Ordered mine in the winter when I was not using my telescope yet since it was so cold. Kind of disappointed to have to build your own rig to calibrate this, to collimate some this else. Small chance I may try this product again, might just try another product. (EDIT) I received a defective unit. The company did not hesitate to send me a new one to try out and were quite sympathetic. I started my rating off pretty harsh with one star, but had to give at least three for the customer service alone. I have not had the opportunity to test the replacement unit they had sent. I will update my review again once I have. UPDATE: Used the second unit for quite a while now, and the later has been accurate the entire time. My telescope is now properly collimated and can now view the beautiful things in our solar system and beyond. The customer service has been incredible and understanding. The product has been working like a charm now and I am completely satisfied. I do, on the other hand, have to give fair warning to future potential buyers to check the accuracy of their lazer collimater before using it on their telescopes. This might actually apply to all lazer collimator products, and may require you to fashion your own rig to do it. If all is well, collimate your heart out!

Nice product, easy to use

Es excelente para colimar mi telescopio con mejor precisión.

The laser works as expected. It came collimated perfectly. No issues lining up the mirrors of my telescope. Laser is very bright and easy to see.