| Minolta AF Macro 100 mm | |
| Maker: | Minolta, Sony |
| Mount: | Minolta / Sony A-mount |
| Part-Number: | SAL-50M28 |
| Focusdrive: | screwdrive |
| Feat-Usm: | no |
| Feat-Ws: | no |
| Feat-Mfo: | no |
| Feat-Is: | no |
| Application: | Macro |
| Type: | Prime |
| Flength: | 50 mm |
| Image-Format: | 135 film (24×36mm) |
| Elements: | 7 |
| Groups: | 6 |
| Diaphragm: | 7 blades |
| Max-Mag: | 1:1 |
| Filter: | 55 mm |
| Hood: | Lens hood |
| Case: | Lens case or pouch |
| Av-Diag: | 47° |
| Start: | 1985 |
| Stop: | 2022 |
| Msrp: | 599 |
| Msrp-Currency: | USD |
| Msrp-Date: | 2015 |
| References: | [1] |
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.
The 50mm 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 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 | |||||
| Focus | Min. | |||||
| Limiter | colspan=4 | |||||
| AF stop | colspan=3 | |||||
| Dims. | Dia. | |||||
| Len. | ||||||
| Wgt. | ||||||
| Filter (mm) | 55 | |||||
| Refs. | [3] | [4] | [5] [6] | |||
The optical design for the 50mm macro lens was credited to Sho Tokumaru,[7] 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.[8]