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Minolta AF Reflex 500mm f/8

From Wikipedia, the free encyclopedia

Minolta Reflex 500mm f/8
MakerMinolta, Sony
Technical data
TypeSpecial Prime
Focal length500 mm
Aperture (max/min)f/8 fixed
Close focus distance4 m
Max. magnification1/7.7
Diaphragm bladesNo blades, circular
Construction7 elements in 5 groups
Features
Ultrasonic motorNo No
Macro capableNo No
Unique featuresAF capable Mirror Lens
ApplicationTelephoto
Physical
Max. length118 mm
Weight665 g
Filter diameterFront 82mm & Rear drop-in (Clear and NDx4)
Accessories
Lens hoodFront threaded
Angle of view
Horizontal4.9°
History
Introduction1989
Discontinuation2010
SuccessorMinolta version succeeded by Sony version in 2006
Retail info
MSRP699 USD (as of 2006)

Originally produced by Minolta, and until recently, produced by Sony, the AF Reflex 500mm f/8 is a catadioptric photographic lens compatible with cameras using the Minolta A-mount and Sony A-mount lens mounts.

The Minolta/Sony Reflex 500mm lens is the only production mirror lens designed to auto focus with an SLR camera. There are other mirror lenses that can mount onto current mounts such as Canon EF-mount and Nikon F-mount, but all of these mirror lenses are manual focus only. Only this lens can have its focus controlled by the camera's autofocus motor in conjunction with TTL autofocus sensing. In terms of the Minolta AF and subsequent Sony α SLR systems, this lens is an anomaly, being the only lens guaranteed to auto focus at f/8. Minolta also produced a V-mount 400 mm f/8 Reflex lens that can autofocus at f/8, but only the Minolta Vectis S-1, Minolta Vectis S-100 and Minolta Dimâge RD 3000 can use it.

The mirror design does not utilize aperture blades, and thus the aperture of the lens is fixed at f/8. Exposure may only be controlled by shutter speed, film or sensor sensitivity, or a rear-mounted neutral density filter.

By using a mirror design similar to that of a telescope, this lens uses very little glass compared to traditional telephoto lenses and is thus much smaller, lighter, and far less expensive than traditional lenses in the same focal length. However, this and all other mirror lenses, can produce a donut-shaped bokeh in the image it produces, which is usually undesirable[citation needed].

American Robin taken with the Minolta AF Reflex 500mm F8 showing the Donut Bokeh
American Robin taken with the Minolta AF Reflex 500mm F8 showing the Donut Bokeh

YouTube Encyclopedic

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Transcription

See also

References

Sources

This page was last edited on 7 May 2020, at 10:08
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