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Minolta AF Macro 50mm f/2.8

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Minolta AF Macro 100 mm f/2.8
Sony A Macro 50mm f2.8.jpg
Sony AF Macro 50 mm f/2.8 lens (third version)
Maker Minolta, Sony
Lens mount(s) Minolta / Sony A-mount
Part numberSAL-50M28
Technical data
TypePrime
Focus drive screwdrive
Focal length50 mm
Image format 135 film (24×36mm)
Aperture (max/min)f/2.8–32
Close focus distance0.2 m (0.65 ft)
Max. magnification1:1
Diaphragm blades7 blades
Construction7 elements in 6 groups
Features
Manual focus override no
Ultrasonic motor no
Weather-sealing no
Lens-based stabilization no
ApplicationMacro
Physical
Min. length59 mm (2+5⁄16 in)
Diameter68 mm (2+11⁄16 in)
Weight292 g (10+5⁄16 oz)
Filter diameter55 mm
Accessories
Lens hoodLens hood
CaseLens case or pouch
Angle of view
Diagonal47°
History
Introduction1985
Discontinuation2022
Retail info
MSRP 599  USD  (as of 2015)
References
[1]

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.

Contents

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/2.8Minolta AF Macro 50 mm f/2.8 (restyled)Minolta AF Macro 50 mm f/2.8 DSony AF Macro 50 mm f/2.8
Model no.SAL-50M28
Year1985199320012006
Focal length 50 mm
Aperture f/2.8–32, 7-blade
Const.Ele.7
Grp.6
ADIDark Red x.svg NoGreen check.svg Yes
FocusMin.0.65 ft (0.2 m)0.66 ft (0.2 m)
LimiterGreen check.svg Yes
AF stopDark Red x.svg NoGreen check.svg 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) JPS59228220A (Tokumaru, 1983).svg
Embodiment 1 of JPS59228220A (Tokumaru, 1983)

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

References

  1. 1 2 "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. 1 2 JPPatent S59228220A,得丸　祥,"Large diameter macro lens",published December 21, 1984, assigned to Minolta Co., Ltd.
  8. ↑ JPPatent S59152414A,得丸　祥,"Fast macro lens",published August 31, 1984, assigned to Minolta Co., Ltd.
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