The flat target methods will reveal every minor flaw. Even when a camera/lens combo is adjusted just as well or even better than with the LensAlign system, minor flaws will be visible in the test pictures of a flat target.Īppendix: Maps of two focus systems with which I am personally very familiar. Other AF systems in modern DSLRs are similar. The area of sensitivity for most focus points in most configurations are much larger than the indicators seen through the viewfinder.Ī map of the EOS 5D mark II focus system. The dark black rectangles, along with the spot metering circle, are all that appear in the viewfinder. The larger blue rectangles are the actual coverage area for each of those points.
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