Panasonic Leica DG Macro-Elmarit 45mm F2.8 ASPH OIS

Panasonic's first Leica-branded lens for Micro Four Thirds is a tiny internal focusing macro capable of true 1:1 magnification. Like its sibling it fits a lot into a very small space; the 45mm measures just 2.5" in each dimension, yet manages to to incorporate optical image stabilization. This lens can focus to just 0.15m without changing in length - a feat made possible by a complex internal focusing system which uses three groups in a floating arrangement. Optically it's very good indeed, but the image stabilization system isn't the most effective especially at macro distances.