|
Matt,
I have a new GSO 10" dob sitting here in plastic. I have a new focuser coming from starlight, if I don't get focus with it I will cut the tube, there is no option. I'm not prepared to screw around with longer screws and changing retaining springs, It's easier to trim the tube.
If you have a dslr with live view just hold near the focuser and move it in / out to see how far away you are.
|