The title says it... I have an f4 Newt that gets viz and AP use, but it only has a single set screw/compression band retainer, and it pushes the coma corrector off center when it's cinched down. I put a round or 2 of electrical tape around the coma corrector barrel, to try to tighten up the fit in the focuser tube, but even then, still, the single screw introduces a slight tilt. I placed a 2" parfocal ring on the coma corrector, thinking it'd give me a shoulder to snug down the fit tightly, it might help keep it straight, but no luck. It is not such an issue with visual but not good when the scope is used for AP, especially at f4 or even f3, with the reducer/corrector. It must not have tilt.
What I'm wanting is a 2" focuser, R&P, that has a twistlock type holder on the tube OR has male m54 threads on the tube so I can put one of my m54 Baader twistlocks on it.
If there are better options, I'm open to it. Currently, an oversized 2" barrel with a single screw compression band, well, that just isn't optimal. I do have a 3 screw compression band Moonlite, and that is a little better at centering the EP or coma corrector, but it's not R&P, and I'm kinda set on that. Any ideas are appreciated!
Jay
