this high quality lens was introduced with the Panasonic GH-1 in 2009 to provide an optimised HD video capability by introducing for the 1st time in any interchangeable lens the following features designed for HD video (hence the HD designation):
in addition, it has the usual Panasonic Mega OIS optical image stabilisation (2-3EV) which also works during HD video
14-140mm focal length = 28-280mm in 35mm terms
f/4.0-5.8 aperture - unfortunately at 50mm widest aperture is f/5.6, and at 140mm, one really needs to stop it down to f/8 for reasonable sharpness
high build quality, with metal mount
internal focusing
17 elements in 13 groups (4 Aspherical lenses, 2 ED lenses)
7 rounded blades
62mm non-rotating filter
closest focus 50cm giving maximum macro 0.2x
high optical quality for a 10x zoom although it does get a touch soft at the long end and does have a lot of barrel distortion at wide end, some CA and significant vignetting although all of these are largely corrected in-camera if you have a Panasonic camera but some Olympus users will not be so lucky and will need to do some post-processing
70mm diam x 84mm long
at 460g, rather heavy for a
Micro Four Thirds system lens but still works well with the larger cameras such as the GH and G series