This set is lightweight yet robust, PL-mounted, covers Full Frame and has quickly interchangeable magnification tubes with 10X, 20X, 35X & 50X options. Every magnification option produces superb images with high resolution due in part to its APO design. Notably, Laowa utilizes adjustable numerical apertures (NA) ranging from 0.15 to 0.5 with 0.5 being equivalent to shooting “wide-open” on a standard lens. The lens also has a fixed focus of 20mm from the front element. Email us for availability or the opportunity to test!!