a few months back a few of you may have noted my 3D printed ultra-low profile 2in Crayford focuser for use in my 12in F3.3 scope.
I wanted to make another addition to the system along the lines of what the more expensive coma corrects have for example The Paracorr visual model tunable top
because as far as I can tell the distance that the eyepiece sits behind the coma corrector lens can vary greatly from eyepiece to eyepiece.
So what my question is, can this simple be a tertiary focuser mechanism that drops into my 2in coma-corrector? (in my case a low cost Revelation coma corrector).
Initially I suppose I could just use different spacers to find the range I need.
This does not effect or change the crayford focuser that sits at the bottom of it all.
I suppose another question i've got is when you are using a tunable top style corrector does changing the position of the eyepiece also effect the focus whereby you have to refocus the main focuser drawtube?
So say you drop an eyepiece in, find focus, decide the coma correction is not optimal, change the tunable top position, do you then have to refocus?
thanks in advance,