Full-frame and 46 mm image circle. Maximum micro-contrast control and extremely low chromatic aberration for unparalleled image quality. Large aperture of T1.9 and smooth bokeh for beautiful background separation. Rear filter holder for a more flexible workflow and creative control in filmmaking. Precisely constructed to minimize focus breathing and maintain a consistent field of view during focus adjustments. Weight and size matched to other NiSi Athena lenses, eliminating the need for rebalancing on a gimbal when switching between lenses. 77 mm filter thread and coordinated aperture and focus rings across the entire range for easy use of lens accessories. Focus ring with 300° rotation and fluorescent focus scales for precise, easily readable focus adjustments in all lighting conditions. Provides unmatched image quality, flexibility, and creative control for filmmakers.