For reliable measurement of focus performance of your camera-lens combination, the Datacolor SpyderLensCal is used. It allows photographers to ensure that the focus on the camera is same as what they require.

• The Datacolor SpyderLensCal is compact, lightweight, and durable
• It is developed based on the modern DSLR autofocus micro-adjustment technology
• This lens calibration tool comes with tripod mount and integrated level, which makes it convenient to attach it to the camera
• The result obtained from this calibration tool is accurate and reliable
  

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.

The problem: Photographers have enjoyed the benefit of autofocus for 25 years now, but many still struggle with its accuracy and repeatability.

The solution: Many newer DSLR cameras now offer a method to correct this issue: they allow you to store auto-focus correction data for several of your most important lenses (learn more link)