Panasonic writes no Exif LensModel. The lens name is in its maker note
(LensType, 0x0051), and a RW2 or RWL keeps that maker note only in the
Exif of its embedded JpgFromRaw (IFD0 0x002E), not in the raw's own Exif
IFD. When LensModel is absent, read it from the maker note, and for a
raw from the JpgFromRaw's Exif.
Checked on the CC0 samples DC-GX9 gx9_1_1.RW2 (LUMIX G 25/F1.7) and
DC-S5 P1047510.RW2 (LUMIX S 85/F1.8), also through the sparse header
plan an import uses.
Gert Pellin
f9c97ab57b