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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

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.

History and design

The 50mm f/2.8 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 f/2.8

LensSpec		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.

The optical design for the 50mm f/2.8 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

1. ^ "50 mm F2.8 Macro: Product Specifications". Sony. Archived from the original on September 26, 2015.
2. Schwalberg, Bob (March 1985). "A Dozen New Maxxum AF Lenses Include Five Zooms and A Fast APO Tele". Popular Photography. Vol. 92, no. 3. Los Angeles: Ziff-Davis Publishing Company. p. 112. ISSN 0032-4582. Retrieved 8 November 2021.
3. "Maxxum Lenses". Konica Minolta USA. Archived from the original on March 25, 2005.
4. "Maxxum System Accessories". Konica Minolta Photo Imaging, Inc. September 2004. Retrieved 13 August 2024.
5. "Lenses and Accessories Selection Guide" (PDF). Sony Electronics. 2007. Retrieved 13 August 2024.
6. "Sony α lenses" (PDF). Sony Electronics. 2011. Retrieved 13 August 2024.
7. ^ JP Patent S59228220A, 得丸　祥, "Large diameter macro lens", published December 21, 1984, assigned to Minolta Co., Ltd. 
8. JP Patent S59152414A, 得丸　祥, "Fast macro lens", published August 31, 1984, assigned to Minolta Co., Ltd. 

External links

• Dyxum lens data
• Sony: SAL-50M28: 50mm F2.8 Macro Lens

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