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EXCERPT page containing first few paragraphs. 2023-10-03 10:55:51

Lens Asymmetry/Blur With Fuji X100

A great MTF chart is just that— a chart of maximum achievable performance if a lens is built with exacting tolerances. That doesn’t happen, except perhaps for the military or lenses costing $30K each for Hollywood, or perhaps (most of the time) for high quality control lenses, such as those from Leica.

Real lenses must be built

Real lenses have to be constructed with high precision to deliver their theoretical performance. Yet it is invariably the case that manufacturing processes allow very significant tolerances which can drop actual performance well below that of what the MTF chart would suggest, especially along the edges or corners.

Sample variation

The image used here was from the 3rd Fuji X100 sample that I had tested. Of those, 2 of 3 samples showed blur on one side of the frame.

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Intrigued? See Focusing Zeiss DSLR Lenses For Peak Performance, PART ONE: The Challenges, or (one topic of many) field curvature.

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