Actually never had to use it but now that I have an Irix 11mm/f4.0 Blackstone it’s starting to make a lot of sense! Have a look at these crops, first with lenscorrection module enabled but without TCA override and the second with. Huge difference! I did do some straightening and sharpening which normally accentuates any color fringing issues but this is amazing output!
Without TCA-override
With TCA_override
The final image
File name: KMGQ3743-F11mm-A8.0-Irix11mm-ISO200-dt_03-illustration40-tonemap50-2026-web.jpg (Standard Exif Tags)
Date and Time : 2026:05:19 18:48:14
Model : PENTAX K-1 Mark II
Software : darktable 5.4.1
Date and Time (original) : 2026:05:19 09:18:21
Exposure Bias : -3/10 EV
Exposure Mode : Manual
Exposure Program : Aperture priority
Exposure Time : 1/250 s
FNumber : F8
Focal Length : 11.0 mm
ISO Speed Ratings : 200
White Balance : Auto
