Auto Lens Correction's total dependence on the Lensfun library hinders it more than it helps. I propose that a semi-auto mode on the BQM Auto Lens Correction tool be added to allow for the manual selection of camera body and lens, but the shot data come from the image itself. Right now, manual mode expects me to enter the shot data manually as well, which is impossible for a batch of photos (and thus defeating the purpose of the BQM). In the semi-auto mode, a camera with similar crop-factor and lens mount (my camera is a Olympus Pen-F and is not listed but is similar to the E-M1 which is listed) can be selected along with a lens similar to the unlisted one as well (I selected an Olympus 14-150mm lens as a substitute for my Tamron 14-150mm lens which is unlisted). In single photo processing I found this works quite well. By adding this as a semi-auto mode, the BQM will be that much better as we wait for the Lensfun libraries to be updated. BTW, this applies to all versions of digikam.
*** This bug has been marked as a duplicate of bug 381705 ***
Since December 2023, all long-time deprecated LensFun API have been removed and internal digiKam LensFun interface is completely broken. Relevant commit from LensFun library : https://github.com/lensfun/lensfun/commit/d67a1f45599dedd6ce686097ddcccc4f3ab83a4b Gilles Caulier