This will be mounted on the main OTA for the 12.5" (316mm cleqar aperture) Newtonian. I plan to use a wide field eyepiece (no crosshairs) for a rich view of the sky. I have a WO field flattener (on the left) that I may use for wide field imaging. There is a 10x40 finder (from my old C11) in front of it for scale.