SVBONY Red Laser Collimator for Newtonian Marca Telescope Alignment 1.25 inches 7 Bright Levels Triple Cemented Lens with 2 inches Adapter

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.

I take my telescopes out in the field and have to transport them from the car to field. After set up, it only takes a few seconds to check culmination in case the mirror slipped a bit out of alignment. This is such a great tool and a must for any reflector or compound telescope.

I have had telescopes for years and always used a home made Cheshire Eyepiece for initial collimation and then an out of focus star to "tweak" that last tiny adjustments. When I saw the price of this laser collimation tool I decided to give it a try after reading a few reviews. The one I received was spot on collimated and required no fiddling with correcting the aim of the thing. It worked as expected and the variable brightness of the laser was a useful feature. As far as the "Collimate in Minutes" goes, yes, you can complete the process if your scope is not too far out of adjustment, but if you have had the mirrors out and replaced them it will take a little longer time. A center dot on the primary mirror is needed and easy to do. Several YouTube videos on adding the dot and using this Collimator. The only issue I have with it is the switch is sketchy. As you turn it the laser will come on at the brightness I desire but then it goes off. If I wiggle the switch it will come back on and stay on. I thought I may return it as defective but since it was shipped collimated correctly I do not want to take a chance of exchanging it for another one. I will just wiggle the switch. I will still use a star for the final tweaking but this Collimator is an excellent starting point. 4 Stars Overall

Good range of brightness levels. Came reasonably collimated (adjustable). Works great with the Barlowed laser technique. Really easy and effective! Brightness: quite dim on the lowest setting to quite bright by the 4th or 5th. Collimation/alignment of the laser itself. I setup a fixture using Legos (great suggestion I read online), placed it on a granite countertop (tape the fixture to the countertop so it won’t move), and targeted the wall 6 meters away. The diameter of the circle traced on the wall as I rotated the laser on the fixture was 2 cm. Not bad but not perfect. This alignment (right out of the box) was +- 0.2% (equivalently +- 0.1 degree). For my 1200mm focal length scope, the targeting of the center of the primary would be +- 2mm; as reflected back onto the target on the laser (2x focal length): +- 4mm. (It could be adjusted better than that if I wanted to, but see below.) While googling to see if that alignment would be sufficient, I came across the Barlowed laser method. I tried it, and it works GREAT! I was very happy. Super easy and convenient! (Assuming your telescope collimation is pretty close, secondary ok, and you just need to fine-tune the primary, which is typically the case with a frequently-used and unabused Newtonian....) 1. Put the laser in a 2x Barlow. 2. Put the Barlow in your focuser. 3. Turn on the laser, using a fairly bright setting. 4. Observe the shadow of the primary mirror’s center marker “donut” in the target area of the laser. 5. If the donut is already centered on the target, you’re done. Mine was about 1/4” off. 6. Loosen the lock screws on the primary. 7. Adjust the primary, turning one screw at a time to see where the donut shadow moves on the target. (You can see the target while at the primary end, so you don’t have to move back and forth between the primary end and the focuser like you would with a Cheshire or collimator cap.) 7. When the donut shadow is centered on the target, tighten the lock screws, and you’re done. Quick and easy. Love the Barlowed laser method. Note: unlike with the direct laser method, the Barlowed laser method is insensitive to small laser collimation and positioning errors. So this works even with the laser alignment a little off.

Works very well and extremely easy to use.

As an avid stargazer, I've tested countless accessories to enhance my telescope's performance. The telescopic laser collimator, however, has truly revolutionized my observing experience. This tool is nothing short of amazing! From the moment I unpacked it, I was impressed by its sturdy build and sleek design. The instructions were clear and easy to follow, making alignment a breeze. Using the laser collimator, I achieved unparalleled accuracy in aligning my telescope. The precision of the laser beam allowed for quick and effortless adjustments, ensuring optimal performance every time. The difference in image clarity is astounding – stars are pin-sharp, and planets reveal stunning details that were previously elusive. What sets this collimator apart is its reliability and rigid design. Even during prolonged observation sessions, the alignment remains steadfast, saving me time and frustration. It's also compact and lightweight, making it a perfect companion for field trips.

Nice and bright. Easy to use. Even comes with a 2" adapter. Fits right in my jacket pocket

I purchased this collimator for $26 in 2020. Three years later I am still using it and I thought I should share the meaningful characteristics. The collimation error of the laser is less than 0.1%. I am getting less than 1mm deviation at 5 meters (less than 1/16" at 17 feet). Note that the factory collimation wasn't good at all - more on this later. There are 7 levels of brightness. 7 is way too bright to be useful. In some cases, the lowest level is still a bit brighter than I would like, but for most use cases the range of brightness is perfectly adequate. The adjustment knob works very well is ergonomic. The battery (CR2032) is easy to access, but I doubt I will ever need to replace it. The spot is elliptical but reasonably tight: at 5 meters it is 5x3mm (at 17 feet it is about 1/4x1/8"). Construction and overall quality of materials and machining is very good. The main drawback is that the adjustment screws to collimate the laser are covered with rubber so that the screws can't be accessed. The collimation error of the laser was originally in the order of 1% - perhaps a bit more - somewhat usable but annoying when collimating a telescope: it requires remembering in which direction the error is, and pointing the laser to the correct edge of the marker of the center of the mirror. However, it is possible to remove (destroy) the rubber protection on the adjustment screws with toothpicks or hard plastic implements (the third screw is under the laser warning label). Once the screws are exposed (metric 2mm hex wrench), it is possible to adjust the collimation of the laser as easily and as accurately as on laser collimators that are 5 times more expensive.

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

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.

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.