Auto Mamiya / Sekor SX 21mm f/4.0

The Auto Mamiya / Sekor SX 21mm f/4.0 is a camera glass with a wide angle of view. It is compatible with various camera mounts. It has a manual focus system, meaning that the user has to adjust the focus manually. It has a good bokeh effect, which refers to the quality of the out-of-focus areas in an image. It has a fixed aperture of f/4.0, which is not the brightest in its category, but still provides decent results. The lens is made up of several glass elements, which help to reduce distortion and chromatic aberrations. It has a lens coating that helps to reduce glare and improve image quality. The build quality of the lens is good, making it durable and long-lasting. The lens was manufactured a while ago, so it may not have some of the modern features found in newer lenses. The resolution of the lens is decent, producing sharp images with good detail. Overall, the Auto Mamiya / Sekor SX 21mm f/4.0 is a good option for those looking for a wide-angle lens with good build quality and decent image quality.