The first thing to know about autofocus microadjustment is that not all cameras support it.В Supported Canon cameras include: 1D Mark III, 1Ds Mark III, 1D Mark IV, 1D X, 5D Mark II, 5D Mark III, 6D, 7D, 7D Mark II, 50D, and 70D. On the other hand, if you frequently work at wider apertures, your lens may well benefit from an adjustment.В However, it takes great care to make these modifications properly, lest a greater error might be introduced.

If youвЂ™re using a lens with a maximum aperture of less than f/2.8 or you never open up wider than that, the error any modern camera and lens makes will not exceed the range of your depth of field. This was shot on a 200mm lens at f/2.0, leaving very little room for error in focusing Which Lenses Benefit This becomes particularly important at wide apertures, where depth of field is so small that an error of a few centimeters in either direction can be the difference between making a shot and making a mess.В Autofocus microadjustment (AFMA) allows us to make that correction by programming your camera body to consistently apply a compensation whenever that lens is attached. The key that allows us to correct for this error is that it is consistent if we can measure its size and which direction it falls in, we can compensate for it by applying an equal and opposite correction. This means there is a consistent error in which the lens focuses too far forward of the subject or too far behindВ (i.e., the lens front focuses or back focuses). Often, a camera body and lens will focus precisely, but not accurately. If youвЂ™ve been careful about your focus points, you have good light and your technique is sound, but you still have a lot of out of focus shots, your lens and body might need an autofocus microadjustment.

Of course, with that thin depth of field comes a thin margin of error for focus. If youвЂ™re like most of us, you probably enjoy opening your lens to its widest aperture sometimes for that razor-thin, subject-isolating depth of field and that smooth bokeh. Are you getting all you can out of your lens, though? Depth of Field, or Lack Thereof They donвЂ™t defy the laws of physics, but they sure come close.

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