How Much Do Copies of the Same Lens Differ From One Another?
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We know from experience that if we mount multiple copies of a given lens on one camera, each one is a bit different. One lens may front focus a bit, another back focus. One may seem a bit sharper close up, another is a bit sharper at infinity. But most are perfectly acceptable (meaning the variation between different copies is a lot smaller than the variation you’re likely to detect in a print). I can tell you that, but showing you is more effective.
Here’s a good illustration, a run of 3 different 100mm lenses, all of which are known to be quite sharp: the original Canon 100mm f/2.8 Macro, the newer Canon 100mm f/2.8 IS L Macro, and the Zeiss ZE 100mm Makro. The charts shows the highest resolution (at the center of the lens) across the horizontal axis, and the weighted average resolution of the entire lens on the vertical axis, measured in line pairs / image height. All were taken on the same camera body and the best of several measurements for each lens copy is the one graphed.
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How Much Do Copies of the Same Lens Differ From One Another?
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