Free Express Shipping! Venus Optics Aurogon FF 10-50x NA0.5 Supermicro APO Lens (ARRI PL) Covers Full-Frame Sensors, 10, 20, 35, 50x Interchangeable Tubes, High 0.5 to 0.1 NA (Numerical Aperture), Fixed 0.78" Working Distance, High-Performance APO...