Smooth surface, easy to assemble, exquisite workmanship, the combination with the mount is tight and smooth. Full manual operation, manual focusing, manual aperture adjustment, can achieve manual exposure with the body, aperture priority exposure. Inner wall paint spraying extinction treatment, not to reflect on the CMOS affect the imaging. Made of high quality alloy, sturdy and durable, with anti-corrosion and anti-rust surface, can prolong the service life. This adapter ring allows for Praktica PB mount lens to be mounted on for NEX mount body, greatly increasing the lens suitability.