Originally produced by Minolta, and later produced by Sony, the AF Macro 50mm 2.8 is a macro prime photographic lens compatible with cameras using the Minolta A-mount and Sony A-mount lens mounts.
History and design The 50mm was one of the lenses introduced with the Maxxum 7000 in 1985. It later was updated in a second version with an identical optical design and restyled cosmetics, which added a focus hold button. A third version was released in 2001 with a larger rubber focus ring and an 8-pin electronic interface for use with "D" series flashes and bodies; this was subsequently adopted and re-released by Sony after it acquired the camera division of Konica Minolta in 2006.
+Minolta / Konica Minolta / Sony AF Macro 50 mm colspan=2 Minolta AF Macro 50 mm Minolta AF Macro 50 mm (restyled) Minolta AF Macro 50 mm D Sony AF Macro 50 mm Model no. SAL-50M28 Year 1985 1993 2001 2006 Focal length 50 mm Aperture , 7-blade Const. Ele. 7 Grp. 6 ADI colspan=2 colspan=2 Focus Min. Limiter colspan=4 AF stop colspan=3 Dims. Dia. Len. Wgt. Filter (mm) 55 Refs.
The optical design for the 50mm macro lens was credited to Sho Tokumaru, featuring a "double floating" element design, which incorporated zoom lens technology to move three groups independently at slightly different rates during focusing to improve lens performance over a wide range of focusing distances.
See also List of Minolta A-mount lenses list of other A-mount lenses
References
External links Dyxum lens data Sony: SAL-50M28: 50mm F2.8 Macro Lens