Capture sharp and precise images with the NiSi Athena Prime 85mm T1.9 Full-Frame Lens. It features 10 aperture blades, T1.9-T22 aperture range, an 80mm front diameter and 0.8 MOD focus and aperture gears. The 300° focus rotation and precise markings in feet and meters make this lens easy to use. Micro-contrast control and low chromatic aberration work together to ensure high-quality images with detailed clarity. Color matched throughout the set, the Athena Primes are sure to punch well above their weight! PL mount models accept a thread-in rear filter while the RF and E Mount models include integrated rear filter slot compatible with select NiSi Drop-In filters.