|
Sorry to drop in on your thread, night-vision, but I'd like to understand as well. I take it the normal mode of focussing an SCT is this mirror movement up and down the OTA and the eyepiece is in a fixed mount. I gather that an option is to set the mirror to a certain location in the OTA, and add a draw tube focusser (Rack & Pinion, Crayford - whatever) and do your focussing with that instead? Is that how it works?
|