EXCERPT page containing first few paragraphs. 2023-10-01 08:52:02
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MTF as published is generally fantasy MTF, meaning that it is derived from a computer design—computer theoretically, not measured with a real lens on a real sensor.
At f/1.7, diffraction is not an issue. But can real lenses match what is claimed? Unlikely.
That being understood, the MTF appears to be very good at f/1.7, rolling off gracefully with significant astigmatism. Whether this is due to lateral chromatic aberration or something else is unclear.
The strong rolloff of sharpness in the outer zones is confirmed in real world images, which suffer from a fairly strong hazing effect that obscures fine details. Real images also confirm that real (actual) depth of field in the outer zones is very limited until f/4 to f/5.6. The rolloff does not appear to be a field curvature effect.
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