![]() ![]() I'm just saying that you should take the time to test properly before wasting your time sending the camera away. Then again, AF calibration adjustment can be needed. So a lot of people probably end up sending perfectly good cameras away to be calibrated by Canon. There are a LOT of websites and posts telling us how to test AF, and a lot of them give very bad advice which can easily result in "false positives". If you really do find that you have an AF problem, send or take it to a canon service center.Īnd be very sure that your testing methodology is sound before coming to the conclusion that you do have an AF problem. On the 40D, Canon has taken the wise move of hiding that adjustment so that we won't be tempted to fiddle with it Instead, you end up messing up the mirror alignment which then makes it so that the AF cannot be adjusted to be right for all of the AF points at the same time. That is what "calibrates" the body's AF.ĭO NOT fall into the trap of attempting any of the "turn this screw" methods that we sometimes see on websites claiming that this will calibrate the camera's AF. So what happens is that a "lookup table" of data stored in non-volatile memory in the camera gets updated with new data. You simply tell the camera what positions on which sensor elements should "see" the same pattern positions. Instead, because of the way the AF sensor systems work, (comparing the positions of patterns detected on linear sensor arrays onto which "split images" created by prisms are projected), you don't need to physically adjust anything. This is not a physical adjustment as many believe. You also would require a calibrated "tool lens" which, again, us mere mortals do not have. AF is adjusted using special software that only the Canon service centers have. ![]()
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