You perhaps overlook that the OP got inconsistent results. the OP was using their target and was following their instructions that come with the software. I believe the good folks at Rieken know a bit about camera AF. This is explained in your camera manualДЄ problem with many targets is they do not have appropriate detail good enough for reliable fine tune On this last point AF is usually good when the subject is good for accurate AF and less good to occasionally useless with a less good AF subject. If you have taken the trouble to learn the type of subject which works best when the aim is the most accurate AF then you do not need to buy a target which might be (and often is) less than ideal for accurate checking AF is good. Sorry if you regard this next comment as a criticism. The 'why' is explained in your camera users manual. You touch on an important detail in that most commercial targets are designed (depending on the target) to be used at between 20x and 40 x of the focal length of the lens being tested) which at 500mm is between about 33 feet and 83 feet.ДЄ problem with many targets is they do not have appropriate detail good enough for reliable fine tune :( IвЂ™ve tried using it outside for my 200-500 5.6 lens because of the distance required for that lens. Has anyone used Reikan FoCal for fine tuning their lenses.

Reikan focal discount