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HOTECH - 2-inch Crosshair Laser CollimatorThis product is highly recommended
Code: SCA-2C
Precision cheshire laser collimation tool - must have for serious astro-imaging


A highly accurate laser collimation tool with Self-Centering adaptor that takes optical collimation to a whole new level.
The 2-inch SCA Crosshair Laser Collimator works for both 2" and 1.25" Newtonian and SCT telescopes. The unit comes complete including one CR123 battery and detailed user guide.

Beautifully packaged like any serious calibration instrument should be, it comes in a fine sturdy compact padded case.

The HoTech laser collimator separates itself from all other laser collimators with its innovative self-centering adaptor technology. This mechanism allows precise and repeatable installation in all brands of 1.25-in and 2-in telescope focusers. All laser collimators in the current market have one fundamental problem, slop in the adapting structure between the collimator and the telescope focuser.

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.

This self-centering adaptor 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 adaptor accommodates various brands of adapting focusers which have slightly different manufacturing inside diameters so our laser collimator will be precisely centered for each installment.

So the Hotech SCA adaptor 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.

**Note laser collimators themselves require collimation from time to time if knocked during transit or normal use over time and heating etc. A small Allen key is included so you can tweak for corrected parallel adjustment using a suitable jig when required.**




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