The Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH MFT is a zoom lens for micro four thirds that has an aperture of f1.7 throughout the entire zoom range. It therefore performs very well in low light. It has a fast and almost silent autofocus and also features a focus clutch to switch focusing manually.

The lens is composed of 17 elements in 12 groups and has 9 blades for a nice round bokeh. Furthermore, the lens has an infinitely variable de-clickable aperture. 

The dimensions of the lens are 87.6 x 128 x 141.7 cm and it weighs 690g.