Sigma — early 28-200mm f/3.8-5.6 autofocus superzoom for Canon, Nikon, Minolta, Pentax
Sigma's 28-200mm f/3.8-5.6 was among the first superzoom lenses on the market, launched as autofocus SLRs matured, offering one-lens convenience that eliminated the need to carry separate wide and telephoto zooms.
Spanning wide-angle to medium telephoto in a single autofocus lens, the maximum aperture runs from f/3.8 at 28mm to f/5.6 at 200mm. Sigma built it for Canon EF, Nikon F, Minolta A and Pentax K autofocus bodies as well as its own Sigma SA mount, in a plastic-shelled barrel with an internal zoom or extending front group depending on focal length.
As an early superzoom, it makes real compromises: distortion at 28mm, softness at 200mm wide open, and a slower aperture than dedicated shorter zooms, but the practicality of an 8x range made it popular with travellers wanting to pack one lens.
Plentiful and cheap on the used market. Test the autofocus motor for noise or hunting, check the extending barrel for play or wobble, and confirm the zoom does not creep when the camera is pointed up or down.