The easiest way to do this is to choose a sturdy, undistorted wall mounted mirror and adjust the camera position until the Center Focus Point is aimed at the center of the camera's lens in the reflection. Even if you are not using the FoCal software, to use a flat target it must be aligned. It has a module that assists you with getting your camera and target aligned. The FoCal method uses a flat target which must be in a parallel plane with the camera's sensor. Even cameras that don't have "hidden" focus points may not be very accurate in terms of having the focus array aimed at the exact spot indicated in the viewfinder. 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 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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