photo:sigma500mmf4
Sigma 500mm f/4 Ultratel mirror lens
introduction
this super telephoto lens introduced in ? is a catadioptric mirror lens, and as with all such
mirror lenses, share the following characteristics:
specs
500mm focal length and field of view (5°) at infinity focus
fixed f/4 aperture
lens elements, ? groups
closest focus 15m (3m via an extension tube)
rear filter thread
T lens mount thread
159mm diameter, 216mm long and 2.7kg (6lb)
comes with a special lens cap that has a removable inner section. Leaving the lens cap in place, but removing the inner section, cuts the mirror's aperture to f/5.6
matching 2X teleconverter
reviews
photo/sigma500mmf4.txt · Last modified: 2014/05/18 18:17 by gary1