I’d actually recommend you use the laser collimators not on their own but in conjunction with other collimation tools and methods, such as a collimation cap/Cheshire. Before using a laser, I always use such a tool to check for coarse secondary mirror alignment.

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The Farpoint laser collimator is one great collimator that I noticed to be very similar to the Glatter in basic design and advantages.

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Laser collimators are superior to regular Cheshire collimators and collimation caps. However, laser collimators are not perfect.

However, compared to the Glatter, it is a little harder to see very small amounts of misalignment, and the family of accessories and other products is not as diverse as what is offered for the Glatter.

Optical format

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Laser collimators are used for aligning the optics of Newtonian reflector telescopes and some catadioptric and Cassegrain telescopes, if need be.

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The Hotech SCA laser collimator fits in either a 1.25” or 2” focuser using its proprietary “self-centering” rubber adapters.

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However, before buying a Glatter TuBlug, which cost as much as the collimator itself, I had to look into the focuser to check my primary mirror alignment and then go back down to the adjustment screws instead of being able to check the alignment in real time. This was a bit of a pain initially.

Laser collimators project a beam of light down your telescope tube and allow you to make sure your optics are aligned by getting light to hit the center of your primary mirror and bounce back perfectly into the focuser.

It comes in a 1.25”/2” hybrid barrel for use in any size focuser without the need for an adapter, just like the Howie Glatter.

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Can be used to collimate Schmidt-Cassegrain, Ritchey-Chretien, and other Cassegrain-type telescopes if you know what you are doing, though I don’t consider it to be the most intuitive or affordable option.

Like the Apertura laser, many of these lasers ship misaligned with the barrel, requiring us to adjust the alignment in a V-block.

One thing I’ve noticed is that it’s a lot less accurate than more expensive lasers due to the lack of a precision 2” adapter, grid lines, and machining tolerances.

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Extremely sensitive to mechanical misalignments in the telescope that may not ultimately matter, such as the screws or compression ring in your focuser de-centering or tilting the laser.

Very sensitive to misalignment, making them arguably a must-have if you have a telescope with a focal ratio below f/4.5 or so.

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The Howie Glatter laser collimator offers superb machining accuracy and a laser that is certain to be dead-on from the factory.

Make us think our secondary mirror is aligned when it’s actually rotated out of alignment and tilted severely. This may be hard to know if we don’t check with a collimation cap or Cheshire first.

Theoretically, it should be able to offer near-perfect alignment accuracy, just as good as collimating on a defocused star at high magnification.

The Apertura laser collimator uses a 45-degree window like the Hotech SCA laser, though we’ll need to provide our own 1.25” to 2” adapter.

The SVBONY laser collimator is similar to the Apertura laser in design and lack of precision, as I’ve used and confirmed. But it’s cheaper and does include a tight-fitting 1.25” to 2” adapter by default.

Can be rendered nearly useless if the laser itself is not aligned with the barrel of the collimator. This requires adjustment with the laser sitting in some sort of V-block to correct.

However, the SVBONY laser’s screws are hidden behind rubbery coverings, which I just poked through and destroyed to access the adjustment screws with a hex key.

I could use the hybrid 2″/1.25″ version with either size focuser without any difficulties or concerns about decentering the laser with an adapter.

It also has a built-in 45-degree window, so I could use it even while adjusting screws at the other end of the telescope.

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There’s also a pretty good chance the laser will arrive misaligned with the collimator barrel from the factory, making it useless until we adjust it in a V-block with the (thankfully exposed) hex key screws.

The TuBlug, if you buy it, can also amplify the sensitivity of your laser to miscollimation. However, it may induce mechanical misalignment/sagging if your focuser cannot handle it.