The Minolta XK | XM SLR
Minolta XK Motor by Satosh Oka

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Minolta XK/XM/X-1 Motor (XK for US & Canadian Market, XM for Europe, X-1 for Asia and Oceania)

The Year of production
: 1976
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Minolta produced XK/XM/X-1 Motor as the Motorized system camera for Professional heavy-duty use based on XK/XM/X-1 camera in 1976. XK/XM/X-1 Motor is the first 35mm SLR camera expressly produced for motorized operation with automatic/manual exposure and frame-rate control and interchangeable viewfinder.

The exclusive one-piece motor-drive body enable reliability, efficiency, and ease of use superior to detachable motor units, plus utmost durability in extended heavy-duty use.

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The quick response AE-S finder is prepared as the standard finder for motor drive. The metering is center-weighted type by silicon photo cell. This finder allowed full aperture priority operation from 1/2000th sec to 16 seconds.

All images of the XK Motor courtesy of: Satosh Oka who also maintains a site in Japan on his own relates to Minolta XK and XD series SLR bodies.


Type: 35mm single lens reflex with electronic focal plane shutter. Interchangeable finder/screen type.
Lens Mount: Stainless-steel Minolta SLR bayonet mount (Minolta SR)

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Shutter:Electronically controlled horizontal-run focal-plane type with titanium curtains and 2 mechanically controlled settings. Electronic speeds: 1/2000th sec to 16 seconds in steps, 8 to 1/2000th sec continuously variable (with AE-S Finder)
Mechanical settings: X (1/100th sec.) and B.

Viewfinder: Interchangeable type showing 98% of area appearing on film
Film Advance: Motor-dirve: By single micro motor for S(single-frame) or 1, 2, 3, and "H" (3.5) continuous frames per second set by selector on back of motor-drive housing. Automatic advanced stop by film-tension sensor when film exhausted
: Lever type, single- or multiple stroke, 110degree winding angle after 20 degree unengaged movement
Motor-driven: By same motor as for film advance(time about 9 sec. with fresh batteries and average condition); activated by motor rewind lever; automatic switch-off by film sensor pin leaves end of film leader outside cartridge; drive reset to advance mode when camera back opened.
Manual: by crank
Mirror: Oversize quick-return type (PO value: 140mm; finder image cutoff negligible even with 1600mm RF Rokkor extreme telephoto) ;
Flash Sync: X contact, 1/100th sec. and longer speeds; FP Contact, All speeds through 1/2000th sec.; single terminal with X/FP switch, direct contact on optional accessory for cordless flash unit.
Power Source: Exposure control, 2 alkaline-manganese or silver-oxide batteries (Eveready EPX-76/S-76 or equivalent) lever-lamp type checker on end of body
For Motor: Ten 1.5v AA batteries.
Dimension and weight: 83 x 147.5 x 171, 1450g with AE-S Finder and Standard Battery Pack without lens and batteries.

AE-S Finder:
Type: Eye level pentaprism with built-in meter; automatic electronic and metered/manual exposure control apparatus.
Magnification: 0.8x with 50mm lens focused at infinity
Circuit: Special low-voltage constant-current type incorporating monolithic IC's for computation, memory, and auto shutter-control functions, powered by 2 silver-oxide batteries in camera body.
Visible through eyepiece: F-number set (with most Minolta MC lenses), stepless 2-range LED/digital indication of shutter speed (being set on "AUTO" or for proper exposure on manual mode) by 8 light-emitting diodes which also give range-changing indication, function/step-shutter-speed setting.
Metering: Full aperture TTL Centre-Weighted type by silicon photocell mounted on pentaprism, for Minolta MD or MC lenses; stop-down metering also possible, for other lenses
Measuring range: -2 EV to 17 EV (e.g. 8 sec. at f1.4 to 1/2000 sec at f8) for single frame operation, EV 3 to EV 17 (e.g. 1/4sec. at f1.4 to 1/2000 sec at f8) for continuous operation with f1.4 lens at ASA 100.
Auto shutter-speed range: 8 to 1/2000sec.
Film-speed range: ASA 12 to 6400, set by selector with 1/3-stop locking increments and setting release
Screen compensation: -0.5EV to +3.5EV in 0.5EV click graduations by control on film-speed selector
Others: Built-in eyepiece shutter actuated by lever
Dimension and weight: 42 x 64 x 77.5mm, 215g

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Download a spec sheet for your future reference: HTML | PDF (20k)

Camera Operations XK/XM/X-1: 5 Parts
Specification for XK/XM/X-1:
Main Reference Map for XK/XM/X-1:
HTML | PDF (250k)
Additional info on
XK | XM Motor - by Satosh Oka
More images on XK Motor By : Stephen Schwartz (New)
XK USA fold-out Product brochure in HTML files
and a huge
PDF (1.3MB) copy. Contributed by : Mark Wasmer

Some fabulous views of the Internal Structures that made up of a Minolta XM by Gino Mancini (New);Three great images of a Minolta XM/XM Motor scanned by Hervé Prigent of France (New)

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Other Minolta (now Konica-Minolta) resources on the web:
Free Instruction Mannuals in PDF format downloads for:
Minolta X-370 (300) (2.9 MB) | Minolta X-570 (1.9 MB) | Minolta XG-1 (1.8 MB) | Minolta XG-7 (1.5 MB) | Minolta XG-A (1.8 MB) | Minolta XG-M (1.9 MB) | Minolta SR7 (1.5 MB) | Minolta SR-T (7.0 MB) | Minolta SR-T 102 (1.8 MB) | Minolta SR-T 200/201/202 (2.8 MB) | Minolta SR-T 303 (1.7 MB) | Other models & system accessories (USA) All works courtesy of Mr. Jim, lensinc. Ltd. Thank him, as these are not my effort.

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Credit: Satosh Oka for his superp imagery of the XK Motor and XD-7; ® Stephen Schwartz, for his images of the XK Motor appearing in this site. Mark Wasmer, for his collection of the original marketing brochure. Oleg Volk, who has given me some help; Dick Sullivan whom I had used some references in his site; Hervé Prigent <>of France for his great scanned images from brochure of Minolta XM/XM Motor; Gino Mancini <> for his images of the internal structure of the XM; CYLeow ® , photo editor of the Star newspaper, Malaysia, Mr Poon from Poon photo for their input on Minolta older SLR bodies. Minolta, XD-7, XK, XM, X1, Rokkor, MC lenses are either registered tradenames or trade mark of Milnolta Optical Co. Ltd, Japan. A site dedicted to all Minolta fans worldwide. Made with an Imac.