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Achieve finely detailed shots with the NiSi ATHENA PRIME 25mm T1.9 Full-Frame Lens. Thanks to its 10 aperture blades and 0.8 MOD focus and aperture gears you can capture crisp and clear images with minimal distortion. This full-frame lens also features an 80mm front diameter and 300 focus rotation allowing for precise control and a wide 46mm image circle with a 71.7 horizontal angle of view. Plus lens markings are both in feet and meters for quick and easy shooting. 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 E and L Mount models include integrated rear filter slot compatible with select NiSi Drop-In filters. No Drop-In Filter options are available in Sony E and Fuji G mount.