This is a Panasonic-made lens that sports an Olympus/Panasonic 4:3 mount. As for the lens type, this is a macro lens.
From London Camera Exchange
Panasonic Leica DG Macro-Elmarit 45mm f2.8 ASPH. MEGA O.I.S. Lens H-ES045E
Harrison Cameras
Panasonic 45mm Macro f2.8 G Lens
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