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SESTO SENSO for Schmidt-Cassegrain and aplanatic telescopes

SESTO SENSO robotic focusing motor is perfect for remote control of Schmidt-Cassegrain and Aplanatic Schmidt-Cassegrain (EdgeHD) telescope's focusers. But these telescopes are not provided standard with micrometric focusing knob so, before installing SESTO SENSO, you need to add this. You can add the Feather Touch focuser for Celestron by Starlight Instruments that  replaces original telescope focuser or the Diamond Steeltrack 50,8mm for Schmidt-Cassegrain by Baader Planetarium. To both solutions you can connect SESTO SENSO for remote focusing, let's see how.

Schmidt-Cassegrain and Aplanatic Schmidt-Cassegrain telescopes usually have a rear visual back, in most cases is 31.8mm in diameter, as shown in the image below.

 

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Unthread the visual back and you will find a thread about 50mm in diameter (called SC thread). On this thread, it is possible to screw in various external focusers for Schmidt-Cassegrain telescopes, in this article we see the example of the Diamond Steeltrack 50.8mm model for Schmidt-Cassegrain telescopes, by Baader Planetarium.

 

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Take the Baader focuser and screw it to the back of the telescope until it reaches the stop position. You can also rotate the focuser to align it perfectly with the telescope and then secure it with the screws.

 

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Now let's install SESTO SENSO. Using special allen keys, first remove the outer knob (the micrometer) and then the inner (macrometric) knob. You can thus look at the central focusing shaft of the focuser.

 

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After inserting the proper bushing into SESTO SENSO, insert SESTO SENSO on the focuser, close the grubscrew that fixes thebushing on thefocuser shaft, and then fix the screw that secures SESTO SENSO on the focuser. You're then ready for remote focus.

 

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