Hotech SCA (Self-Centering Adapter)

scaAlmost every customer for our MRT adapter has asked, “This is great, but how do I attach it to my telescope?”  The answer has always been that a direct threaded connection is best, but since most telescopes don’t have T-threads, the next best solution (and one that is far more universal) is the SCA made by Hotech.  So to make it even easier for you, we have arranged to be able to offer you this brilliant product.

The SCA is like a standard 2” nosepiece-to-T-thread adapter, except that instead of using one or two thumbscrews to secure the adapter (leaving your camera vulnerable to falling off as well as probably being tilted and not centered), it has a set of expanding rings that press firmly against the inside of your eyepiece holder around the entire circumference.  It makes a very solid connection that is also perfectly aligned with and centered in the optical axis.

How it works:

The SCA is inserted into your telescope’s 2” eyepiece holder (either before or after attaching the MRT and camera).  You then twist the knurled ring to expand the rings against the inside of the eyepiece holder.  Done!   sca1

The SCA adds only about 19mm to the image path.  As you can see in the picture to the right, the MRT setscrews are still accessible after threading the two pieces together, so in many cases you can attach or adjust the camera after the SCT/MRT assembly is installed on your scope.  The SCA has its own camera rotation feature.  It’s not as convenient as the MRT’s rotation capability, but in cases where the MRT’s thumbscrew cannot be used due to interference with the camera body, you can still rotate the camera using the SCA feature.

For more information on the Hotech SCA please see:


Pricing and availability:

2” SCA: $55
The SCA is generally available from stock.

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About Greg Marshall

I am a retired electronics engineer and after a few months of enjoying my leisure I began to miss doing product development. My astronomy hobby always needed new solutions to unique problems, so I decided that whenever I came up with a good solution I would try to make it available to others.

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