The RX1 Zeiss 35 mm f/2 lens has moderate barrel distortion.
Correcting distortion of this modest amount is not really necessary for most images, but might be warranted for images having straight lines: buildings, horizons, etc.
Correcting distortion in Adobe Camera RAW
Adobe Camera RAW contains a lens profile for the Sony RX1, which makes correcting distortion quite easy. Similar controls are available in Adobe Photoshop Lightroom.
Distortion correction is not “free”; it necessarily stretches pixels out at the periphery, which reduces the micro contrast on fine details.
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