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MTF Curves

Please refer to Making Sharp Images for discussion and examples of how to read MTF charts, as well as the very real issues of build quality and testing for a bad lens or camera.

The presence of mild astigmatism suggests a trace of lateral chromatic aberration might be present, and this indeed is the case in field shooting. Field curvature might also be present, and the modest performance outside the central 2/3 area (15mm offset) suggest that this lens would best be used on a DX format sensor.

Nikon doesn’t publish MTF other than wide-open, but field shots show a marked improvement at f/5.6, so f/4 should be avoided on full-frame cameras; stop down to f/5.6 if feasible.

Remember that a real physical lens can only approach its as-designed specifications, and might not meet this ostensible performance level due to build variation/errors.

MTF chart (modulation transfer function

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MTF for 24-120mm f/4G ED VR at 24mm     
MTF for 24-120mm f/4G ED VR at 24mm
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     MTF for 24-120mm f/4G ED VR at 120mm
MTF for 24-120mm f/4G ED VR at 120mm

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