Hotech 1.25" SCA Laser Collimator

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Hotech 1.25" SCA Laser Collimator

Hotech 1.25" SCA Dot Collimator w/ Self Centering Adapter

The Hotech 1.25" SCA Collimator - Dot - is the ideal precision instrument to collimate your Newtonian and SCT telescope. Unit comes with one patented 1.25" SCA Laser Collimator w/ built-in Self-Centering Adapter, one CR123 battery, and users manuals for Newtonian, SCT, and Star collimation.

The HoTech laser Dot collimator separates itself from all other laser collimators with its innovative self-centering adapter technology (SCA). This mechanism allows precise and repeatable installation in all brands of 1.25" and 2" telescope focusers. All laser collimators in the current market have one fundamental problem, slop in the adapting mechanism between the laser collimator and the telescope focuser. This problem is clearly recognized and often discussed among astronomers but so far there has been no definite solution in the market.

No matter how tightly the tolerances machined on the laser collimator or the focuser, a small gap is required to allow installation of the laser collimator. Once the laser collimator is inserted, the required gap becomes a problem. A laser collimator is secured with one or more thumbscrews or unified compression ring. Both methods introduce a very critical issue, namely an off-axis installment that instantly destroys the precision of your collimation instrument along the entire optical axis.

The Hotech Self-Centering Adapter cleverly eliminates the slop by linearly compressing the built-in rubber rings. By doing this, the diameter of the rings expands to compensate the gap. Because all rings evenly expand radially in diameter from the compression, this automatically centers the laser collimator in the focuser draw tube. The SCA adapter accommodates various brands of adapting focusers which have slightly different manufacturing inside diameters so our laser collimator will be precisely centered for each installment.

In summary, the Hotech SCA adapter serves three critical functions. First, its expansion rings accommodate almost all focuser's manufacturing tolerances. Second, it automatically centers the adapting laser. Third, it provides at least two evenly distributed circular contacts on the focuser's inner tube surface preventing the adapting laser from pivoting. Once the slop factor is taken away, you can quickly collimate your telescope in confidence to achieve perfect collimation every time.

""There is a tremendous amount of creativity and cleverness being displayed, all backed by a fervent devotion to making the sky more accessible and enjoyable for astronomy enthusiasts at all levels. It is truly inspiring." --Robert Naeye, Sky & Telescope Editor in Chief

Hotech Product Number: SCA125


Collimation By ScopeMultiple Designs
Collimation ToolLaser Collimators
Warranty1 Year Warranty
Customer Reviews
1.0 Based on 1 Reviews
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Chris A.
United States
Multiple defective parts...

The first collimator I received, the laser would not come to a point on the target grid and the lid on the storage case was defective (would not close). The replacement collimator I received also came in a defective storage case with a broken lid. The second collimator, after following the directions and how-to videos step by step, would not accurately collimate my sct. I “collimated” my sct with the Hotech collimator and tried to start the collimation process over and reproduce the results. The laser point should hit the target in the same spot, but every time I placed the collimator in the sct and lined it up properly, the laser would be in a different spot on the grid. Unusable.