The fast T1.5 aperture of the Supreme Prime 21mm lens allows for low-light capture, while smooth transitioning between in-focus and out-of-focus areas results in pleasing focus falloff and greater depth in the image. The lens has a 16-blade iris and smooth 300° focus rotation. The minimum focus distance is 13.7". The 21mm is color-matched with the rest of the Supreme Prime lineup and shares many other consistent features, including standardized positioning of the focus and iris rings. Like a few of the other Supreme Primes, it has a front diameter of 95mm. The lens also comes with a removable support foot with a 3/8"-16 mounting thread.