Covers Full-Frame Sensor Size, 46.7mm Image Circle, T1.5 Aperture, Suitable for 8K Image Capture, Clickless 9-Blade Iris, Virtually No Lens Breathing, 300° Focus Barrel Rotation, 114mm Front Lens Diameter, PL Mount. The Tokina 18mm T1.5 Cinema Vista Prime Lens with a Canon EF mount and with focus scales marked in feet provides an image circle that more than covers full-frame sensors and is designed to provide sharp images even when recording images at 8K resolution. This is an 18mm focal length lens and it shares the same form factor lens gear position focus rotation and front barrel diameter as the other Tokina Cinema Vista prime lenses. This makes on-set lens changes a fast and efficient operation. It features a maximum T stop of 1.5 useful when shooting in low-light situations or when you want to capture that exceedingly shallow depth-of-field look. The 9-bladed iris provides round out-of-focus highlights for a natural-looking bokeh. The lens barrel features approximately 300? of rotation from close focus to infinity; this gives you a high degree of precision when pulling focus. The lens is designed to minimize focus breathing and features geared manual focus and iris rings. Markings on both sides of the lens barrel make it readable from either side of the camera.