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Hi Richard,
I'm curious as to why you feel you need a coma corrector for your SW 12" dob for visual use?
Have you observed abberations that you feel need correcting with a coma corrector? Are you sure your collimation is tight? Are you perhaps using eyepieces that aren't well suited to a Newtonian?
I have two Newtonians, a custom built 12" dob that uses SW optics & a 5" Vixen. Both scopes are f5.
I use them regularly with a range of eyepieces (see my signature) & simply have not observed any visual abberations that would warrant using a coma corrector.
I do own one which, I use for astrophotography with my Vixen Newt & I have used it on both Newts visually & noted zero difference... ie: there were no detectable abberations when not using one visually.
At the end of the day, you may indeed need one but, I just thought I'd pose the question?
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