Minolta AF Macro 50mm f/2.8

Originally produced by Minolta, and later produced by Sony, the AF Macro 50mm f/2.8 is a macro prime photographic lens compatible with cameras using the Minolta A-mount and Sony A-mount lens mounts.

Minolta AF Macro 100 mm f/2.8

Sony AF Macro 50 mm f/2.8 lens (third version)
Maker	Minolta, Sony
Lens mount(s)	Minolta / Sony A-mount
Part number	SAL-50M28
Technical data
Type	Prime
Focus drive	screwdrive
Focal length	50 mm
Image format	135 film (24×36mm)
Aperture (max/min)	f/2.8–32
Close focus distance	0.2 m (0.65 ft)
Max. magnification	1:1
Diaphragm blades	7 blades
Construction	7 elements in 6 groups
Features
Manual focus override	no
Ultrasonic motor	no
Weather-sealing	no
Lens-based stabilization	no
Application	Macro
Physical
Min. length	59 mm (2+5⁄16 in)
Diameter	68 mm (2+11⁄16 in)
Weight	292 g (10+5⁄16 oz)
Filter diameter	55 mm
Accessories
Lens hood	Lens hood
Case	Lens case or pouch
Angle of view
Diagonal	47°
History
Introduction	1985
Discontinuation	2022
Retail info
MSRP	599 USD (as of 2015)
References
[1]

History and design

The 50mm f/2.8 was one of the lenses introduced with the Maxxum 7000 in 1985.^[2] 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 f/2.8

Lens Spec		Minolta AF Macro 50 mm f/2.8	Minolta AF Macro 50 mm f/2.8 (restyled)	Minolta AF Macro 50 mm f/2.8 D	Sony AF Macro 50 mm f/2.8
Model no.					SAL-50M28
Year		1985	1993	2001	2006
Focal length		50 mm
Aperture		f/2.8–32, 7-blade
Const.	Ele.	7
	Grp.	6
ADI		No		Yes
Focus	Min.	0.65 ft (0.2 m)			0.66 ft (0.2 m)
	Limiter	Yes
	AF stop	No	Yes
Dims.	Dia.	68 mm (2+11⁄16 in)	70 mm (2+3⁄4 in)	71 mm (2+13⁄16 in)
	Len.	59 mm (2+5⁄16 in)	60 mm (2+3⁄8 in)
	Wgt.	292 g (10+5⁄16 oz)	324 g (11+7⁄16 oz)	290 g (10+3⁄8 oz)	290 g (10.4 oz)
	Filter (mm)	55
Refs.		[3]		[4]	[1][5][6]

Embodiment 1 of JPS59228220A (Tokumaru, 1983)^[7]

The optical design for the 50mm f/2.8 macro lens was credited to Sho Tokumaru,^[8] 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.^[7]

See also

• List of Minolta A-mount lenses
• list of other A-mount lenses