EXCERPT page containing first few paragraphs. 2021-12-03 01:22:25
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This page shows optical distortion at 24mm, and its correction.
Correction was using the Photoshop lens profile during raw conversion. Sony ARW raw is never corrected for distortion by the camera (JPEG is however, if the camera is set to do so).
Example @ 24mm
Distortion is a very low level pincushion distortion.
The lens correction leaves a trace of barrel distortion across center area (determined with a line across the scene in Photoshop)—overcorrection. This is not too surprising, since the EXIF info might not store the focal length exactly right, the correction profile might not have all focal lengths and/or there could be some minor lens variation.
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