This is the TEC APO110FL, Native f/5.6 Fluorite. I use this with the TEC Field-Flattener that brings it to f/5.74 632mm. Attached is my home made OAG and the FLI-ML16200 that gives me a FOV of 117.5 x 146.8 arcmin. Also attached is the Baader Sky Surfer V red dot finder. Sitting on an Astro-Physics 1200 GTOCP3. This is my current Wide-Field setup. . .