Tokina SZ SUPER TELE 500mm F8 Reflex MF is a 500mm super tele lens that adopts catadioptric type optical design with a constant F8 aperture. The lens offers a compact alternative to standard tele photo lenses as more and more photographers are looking for easy-to-carry gear. Keeping in mind active travel photographers that seek outdoor landscape, wild nature or birds, the 500mm F8 Reflex MF is designed as a compact and lightweight mirror lens - a type of lens to be rediscovered in this new era of also compact but high-tech mirrorless cameras. The Tokina SZ SUPER TELE 500mm F8 Reflex MF adopts a T-mount standard (pitch 0.75mm, thread 42mm) that allows the lens to be attached to any camera by using mount adapters. Mount standard pitch 0.75mm, thread 42mm Color Black Minimum Aperture f/8 Maximum Aperture f/8 Format Full Frame (24mm x 36mm) Lens Configuration 7 groups, 7 elements Angle of View 4.8° Minimum Focus Distance 1.7m Macro Ratio 1 : 2.86 Filter size (front) 72mm Filter size (rear) 30.5mm Overall length (excluding T-mount) 89mm Maximum diameter 74mm Weight (without mount adapter) 310g