The SpyderLensCal Autofocus Calibration Aid from Datacolor is a focus test chart, designed for use with select DSLRs that support autofocus adjustment. The chart allows you to test the autofocus accuracy of your camera, making it easy to fine-tune it for optimum performance.
The SpyderLensCal features a built-in level and tripod mount, allowing you to create precise testing environments. Cameras that support autofocus adjustments such as the Canon 5D Mk II, 5D Mk III, 1D Mk III, 1D Mk IV, and 1Ds Mk III, as are supported. Please consult your owner's manual to confirm that your camera supports autofocus adjustment.