Lens Distortion Checkerboard Chart Printable – Fully functional for observing and recording distortion of spherical and anamorphic lenses alike. Learn how to calibrate your camera to achieve optimal image. Useful for evaluating barrel and. In a typical checkerboard layout, each of the field squares is precisely 2 x 2 with the center box. Fully functional for observing and recording distortion of spherical and anamorphic lenses alike. Download a free camera test chart and improve your computer vision project. You can scale these if you want a bit of a margin for rigging/mounting. If you want something to do lens testing that's a little quicker and easier (and much cheaper) then you can do some simpler tests using a test chart as described below. You or your art department can have these printed, laminated (matte finish if possible) and mounted on a wall or rigid board. Checkerboards can be used with camera calibration tools such as the camera_calibration package for ros.