The Datacolor SpyderLensCal™ provides a fast, reliable method of measuring the focus performance on your camera and lens combinations. It allows photographers to obtain razor-sharp focusing or check to see that their lenses are working at their peak performance. This device is compact, lightweight and durable, with integrated level and tri-pod mount.
Photographers have enjoyed the benefit of autofocus for 25 years now, but many still struggle with its accuracy and repeatability.
Many newer DSLR cameras such as the Canon 5D MkII/7D /1D MkIV and the Nikon D7000/D300s/D700/D3s/D3x now offer a method to correct this issue: they allow you to store auto-focus correction data for several of your most important lenses
DSLR or other camera with capability to store lens auto-focus corrections
Auto-focus lenses capable of being driven by this camera
No OS requirements, as the tool works entirely within the camera's menu