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    Default Hotech collimator with SCA - and mutilating my drawtube



    I have been eying the Hotech SCA for a long time, knowing that I can'd do it because my main interest is AP, and the 19mm of added back focus means I would not be able to get the camera to come to focus with it. That doesn't preclude buying the Hotech collimator with the "built-in" SCA however. I am curious if anyone has used it and what thoughts they may have about it.

    A second idea popped into my head while looking at this. If I cut 15mm of the end of my drawtube and pick up the standard Hotech SCA, I would be able to bring my rig into focus, and never have to be concerned with those set screws at the top of the focuser again. This would be an irreversible change, so I am a bit hesitant to try it without getting some feedback from anyone who may have gone this route. Can the SCA "replace" the set-screws for holding eyepieces, coma correctors, nosepieces, etc. in place at the end of the focuser? If so, I am ready to go out and get a pipe-cutter (to make a clean cut) and do a little surgery

    Thanks for sharing your experience in this area.

    Bob
    Hardware: Celestron C6-N w/ Advanced GTmount, Baader MK iii CC, Orion ST-80, Canon 60D (unmodded), Orion SSAG
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    Default Re: Hotech collimator with SCA - and mutilating my drawtube

    I have been doing a little more research into this. I am definitely interested in picking up the 2" self-centering laser collimator. I always feel that my collimation is just a teeny bit off due to the connection through the 2"-1.25" adapter and plugging the laser collimator into the 1.25" end of that adapter. There is no way to true everything up with the optical axis. The good news, this will not require cutting down the drawtube in any way.

    I have also taken a closer look at the Hotech SCA t-adapter for use in connecting the DSLR/Coma Corrector on the optical axis. The Baader MPCC does have M48 threads on the front side that will screw onto the t-adapter, so this is a viable way of connecting the camera/CC. This one would require me to cut down a piece of the drawtube to enable the camera to come to focus. The SCA adds 19mm of back-focus, and I currently have 11mm of inward travel available on the focuser. Any thoughts on doing theis surgery?

    Thanks,
    Bob
    Hardware: Celestron C6-N w/ Advanced GTmount, Baader MK iii CC, Orion ST-80, Canon 60D (unmodded), Orion SSAG
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