![]() ![]() The location of these six AF Assist Points are not indicated in the viewfinder! Yet the camera may be using one of them pointed at something other than the flat part of the test target when it decides the focus distance. When shooting in AI Servo AF, if C.Fn III-07 is enabled, there are six small AF Assist Points clustered within the spot metering circle that are active in addition to the Center Focus Point. For this reason I prefer to use AF adjustment methods that use a flat target.Ĭonsider the Canon 5DMkII, for example. ![]() If the center focus point on the focus screen does not accurately indicate the exact point aimed at by the focus array this can be problematic. The camera's actual AF point must be aimed closely enough to the point indicated by the square in the viewfinder to insure the actual point being focused is on the flat part of the target and not a point (usually on the ruler) that is closer or further than the flat target.The LensAlign unit must be put together perfectly "square".LenAlign is useful and in the right hands can get very good results. ![]()
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