I'm having this same issue (same lens) in Darktable 2.4.1 from the PPA which uses Lensfun 2.8-3. The lens lookup works correctly in Lensfun 0.3.2. I ran a test case in test_database.cpp which successfully passes (My body is a K-7, so I added that in case it was the interaction causing the failure): const lfCamera **cameras = lfFix->db->FindCameras("Pentax", "Pentax K-7"); g_assert_nonnull(cameras); g_assert_cmpstr(cameras[0]->Maker, ==, "Pentax"); g_assert_cmpstr(cameras[0]->Model, ==, "Pentax K-7");...