NiSi Athena Prime 50mm T1.9 The NiSi Athena Prime Lens Series offers a range of focal lengths from 14mm ultra-wide angle to 85mm portrait focal length, which makes it suitable for a wide variety of photography and videography applications. Designed with maximal micro-contrast control and ultra-low chromatic aberration, these lenses offer unparalleled image quality with finer image details. The lenses feature a large aperture of T1.9 and soft bokeh for beautiful background separation. The Athena Prime Lens Series also includes a drop-in filter mount, which provides a more flexible workflow and creative control for filmmaking.* *only for E mount & RF mount The Athena Prime lenses have been designed to minimise focus breathing. This means that, regardless of the focal length or aperture setting, the change in field of view when adjusting focus from the minimum focus distance to infinity is extremely small. NiSi sharpness and optical quality All NiSi Athena Prime lenses are matched in weight and size, which means they do not require rebalancing on a gimbal when switching between lenses. The 77mm filter thread and matched aperture and focus rings across the range also make it easy to use lens accessories such as filters and focus gears. The focus ring features 300° of rotation with fluorescent focal scales for precise focus pulls. All the NiSi filters at your disposal! The Athena Prime lenses have a front thread of 77mm (except for the 14mm), making them compatible with both NiSi circular filters of 77mm and the Macro Close UP 77mm, as well as the NiSi V7 100mm filter system with True Color CPL, 100×100 ND filters, and 100×150 GND filters. This provides maximum quality and flexibility for your photos and videos.The Athena Prime lenses are also perfect with the new NiSi Swift system and the C5 cinema system for greater light control.