Hi group,

I have an Argo Navis + servocat on an 18" Dob. I need to do lucky cam imaging at high resolution. I center a bright start visually using medium magnification, then remove the eyepiece and replace it with my 4x barlow, filterwheel, camera. Doing this adds some weight that wasn't there with the eyepiece => dob sags a bit and star is gone from FOV. Is it possible to 'mark' a reference position when the star is centered visually, then get back to it when the imaging setup has been mounted? cheers, Mikael