PRPATC3A036

PAT-C3-A036

Pret a Tourner

Verify the back focus of your camera's spherical lens with this Focus Sharpness 2.5 Spherical Lens Test Magnetic Calibration Chart from Pret a Tourner. The portable magnetic calibration chart features a star-shaped Siemens target with 2.5 angle rays and very high-definition printing on a matte, antireflection-coated flexible plate to facilitate checking the back focal length on any spherical photo, cinema, or video lens.