These are the TEC APO’s I’ve used. From the APO110FL to the APO180FL From top to bottom. The TEC APO110FL w/ FF f/5.73 630mm. Still being used today. The TEC APO140ED w/FF f/7.2 1008mm. Sold back in 2013. The TEC APO 160FL w/FF f/7.2 1152mm. Still in the family but not used by me. The TEC APO180FL w/FF f/7.2 1296mm Still being used today . .