Hotech - Advanced CT for 1.25 " Focuser Laser Collimator

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Collimate your Cassegrain Telescope without using a star Indoor or outdoor - day or night with this ultra bright red laser collimator from Hotech.
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Product Description

 HOTECH is a leading company in the opto-electronic industry serving the Astronomy community the world over.  Throughout the history of HOTECH, the company has continuously brought forward innovative and proprietary technologies to develop state-of-the-art, next-generation products offering a competitive edge to Astronomers everywhere.  Enter the HOTECH Advanced CT Laser Collimator, HOTECH's latest device to improve visual accuracy in the Schmidt-Cassegrain telescope and designed to replace the much more complicated and costly Wavefront Interferometers as collimation tools for larger aperture reflectors.

The HOTECH Advanced CT Laser Collimator samples the entire optical system (primary, secondary mirror, and eyepiece axial position) with a simulated large aperture flat-wavefront light source generated by three parallel lasers positioned behind the supplied Target Plate.  By using three perfectly aligned laser beams it emulates the parallel rays coming from a distant star. The beams then pass through the telescope twice to magnify any error in the entire system.  Because of this redundancy even tiny collimation errors become apparent and can then be corrected.

The only user accessible collimation alignment point on a Schmidt-Cassegrain Telescope is via the (3) secondary mirror alignment screws located behind the secondary mirror at the front of the Telescope  Therefore, you only need to adjust the three alignment screws to adjust the secondary mirror to move the three laser spots onto the same circle on the target plate. This limited adjustment makes the collimation simple to perform. The target plate provides a clear view of the mirror alignment when the three lasers are reflected back on the target. The Target Plate should be held in place at the appropriate height by the included adjustable tripod head. Finally, the appropriate Reflector Mirror (1¼" or 2" - your choice depending on the size of your focuser) is inserted it in the visual back (imaging) or into the diagonal (visual use) on the Scope.  That's it.  Start Collimating!

If a user has any questions about the setup process, the ACT Laser Collimator comes with a well illustrated and written Owner's Guide, 7 pages in length which will definitely clear up any confusion during initial setup. ALSO, watch the 2 videos below which will take you step by step thru the Collimation Process with the Advanced CT Laser Collimator.


- Collimation without using a star
- Indoor or outdoor - day or night
- Focus stays at final view setting
- Set-up within focal length distance from your telescope
- One person operation
- Portable and simple to setup and use
- Works on CT, SCT, SN Mak, & RC



Amateur Astronomer magazine Summer 2014:  Robert Reeves wrote this article in the Star People: Real People feature











Name Hotech - Advanced CT for 1.25 " Focuser Laser Collimator
Manufacturer HoTech
Model HOT-ACT-M125
Alignment Procedures Advanced CT Laser Collimation
Attachment Tripod (target Plate), visual back or diagonal (Reflector Mirror)
Batteries (1) CR123 3V Lithium
Construction Hardened, Anodized Aluminum, CNC machined
Design Optical Laser
Fine Focus Yes
Laser (3) Class II
Laser output power 1mW
Laser wavelength Visable red, 650nm
Material Aerospace grade Aluminum
Measuring Accuracy 100%
Mounting connections 1/4 x 20 thread
Mounting to telescope Visual back or Diagonal
Tripod Adaptable yes (recommended)


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