Focal length is the optical distance in millimeters between a camera lens and the sensor or film. It determines the height and width of the scene being captured, known as the "field of view." ...
The Panasonic 15mm f/1.7 Leica Summilux DG ASPH is a great little lens for nature subjects — including astrophotography — thanks to a 30mm equivalent focal length and great image quality.
The Panasonic Leica DG Elmarit 200mm f/2.8 POWER O.I.S. is a telephoto prime lens that is incredibly compact and lightweight, offering a 400mm equivalent focal length alongside the fast f/2.8 ...