Focal Length 50 to 100mm / Mount Canon EF / Format Super35/APS-C / Image Circle 28.4 mm / Maximum T-Stop T2 / Maximum F-Stop 1.8/ Minimum T-Stop T16 / Minimum Focus Distance from Image Plane 96.5 cm/ Front Diameter 95mm / Filter Thread 82mm / Electronic Communication Yes / Weight 1.85 kg