Our latest spherical focus chart is a meticulous collaboration between Duclos Lenses and Old Fast Glass. It's an indispensable tool used by professionals. Fully functional for checking focus accuracy of spherical primes and zooms. Printed in-house onto ultra-bright enhanced matte paper with our unique deep-black technique for excellent contrast and resolution. Print size is 24" x 42". Ships carefully rolled, unmounted. Charts are printed to order with or without custom branding. Contact us today for branding options.