An indispensable tool used by VFX and cinematography professionals around the world - our standard Distortion Dot Chart is used to record, evaluate, and quantify distortion in cinema lenses for use in post-production. Also used for image evaluation software such as Imatest for quantifying geometric distortion. Each dot is a precise 0.250" in diameter and spaced 1.0" apart, center to center. The chart measures 24" x 42" which provides generous coverage for a variety of lens focal lengths and measurement distances. Printed in-house onto ultra-bright enhanced matte paper with our unique deep-black technique for excellent contrast and resolution. Ships carefully rolled, unmounted.