KMZ Zorki 4

Zorki 4

The KMZ Zorki 4 is a Soviet 35mm coupled-rangefinder camera produced from 1956 to 1973. It uses an M39 screw lens mount, a combined viewfinder and rangefinder, a horizontal cloth focal-plane shutter, adjustable flash synchronization and a mechanical self-timer.[1][3]

The camera was developed from the Zorki 3S. KMZ describes it as a Zorki 3S fitted with a self-timer. It became the longest-produced camera in the main Zorki range and was manufactured in substantially larger numbers than the preceding Zorki 3-series models.[1][2]

History

Development and Production

Serial production began in 1956 and continued through 1973. KMZ records an official total of 1,715,677 cameras.[1][2]

The Zorki 4 retained the removable rear body section, combined finder, unified shutter-speed control and flash synchronization of the Zorki 3S. The main addition was a front-mounted mechanical self-timer.

Production overlapped with the Zorki 4K during 1972 and 1973. The Zorki 4 uses a rotating film-advance knob, while the Zorki 4K has a rapid-wind lever and revised transport mechanism.[1]

Shutter-Speed Variants

Early Zorki 4 cameras use the shutter-speed sequence B, 1, 1/2, 1/5, 1/10, 1/25, 1/50, 1/100, 1/250, 1/500 and 1/1000 second.[4]

During the late 1950s, KMZ changed to the standardized sequence B, 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500 and 1/1000 second. Transitional examples with the later sequence are documented from 1959, and it became standard around 1960.[3][4]

Both sequences should be combined under the Zorki 4 page. The exact sequence should be retained as variant metadata for identification and listing matching.

The shutter must be cocked before changing speeds. The selector should not be forced through the unmarked gap between the slow-speed and faster-speed sections.[3]

Viewfinder and Flash

The viewfinder and rangefinder are combined in one eyepiece. The finder is intended for approximately 50 mm lenses and has no projected framelines. Other focal lengths require an external accessory finder.[3]

A diopter-adjustment lever allows the finder to be adjusted to the photographer’s eyesight. The factory manual does not give a precise numerical magnification, although the finder is commonly described as approximately life-size.[3]

The accessory shoe is not electrically connected. Flash units connect through the front cable socket.

Early cameras synchronize at 1/25 second. Cameras with the later shutter sequence synchronize at 1/30 second. The adjustable delay scale supports electronic flash at zero delay and flashbulbs requiring a longer ignition time.[3]

Dimensions and Weight

A practical camera-body specification gives dimensions of approximately 143 mm wide, 91 mm high and 37 mm deep, with a weight of 594 g.[5]

Published weights can differ depending on whether the standard lens, take-up spool, film cassette or case is included. The 594 g figure is used as the main camera-body specification.

Combined Variants

The Zorki 4 underwent many production changes, but these should normally remain combined on one main page.[4]

Early cameras commonly have engraved markings, decorative rims around the finder windows, a vulcanite-style covering, body-mounted strap lugs and the older shutter-speed sequence.

Later cameras can have screen-printed markings, simplified finder-window trim, different synthetic coverings, revised control finishes and no body-mounted strap lugs. Export versions may use Latin Zorki-4 markings and additional “Made in USSR” text.

Some late cameras have a smaller front finder window. Commemorative markings associated with events such as the 1957 World Festival and the 1967 anniversary of Soviet power should be recorded as variant metadata, not separate camera models.[4]

Identification

A standard Zorki 4 has a combined rangefinder-viewfinder, front flash socket, adjustable synchronization scale, mechanical self-timer and rotating film-advance knob.

The Zorki 3S lacks the self-timer. The Zorki 4K replaces the winding knob with a rapid-advance lever.

Serial numbers normally begin with the final two digits of the production year. Detailed collector records document examples from 5612006 through 73000661, but these numbers should not be treated as confirmed factory start and end points.[4]

Recommended listing metadata includes exact_variant, production_period, shutter_speed_sequence, marking_method, engraving, commemorative_edition, export_version, finish, included_lens, self_timer_condition, flash_sync_condition, rangefinder_condition, shutter_condition, accessories, case_included and body_only_or_kit.

Sources

• [1] ZENITcamera Archive. The Zorki Camera Line. https://www.zenitcamera.com/archive/zorki/index.html
• [2] ZENITcamera. KMZ Camera Production Data. https://www.zenitcamera.com/catalog/cameraproduction.html
• [3] KMZ. Zorki-4 Brief Description and Operating Instructions. https://www.zenitcamera.com/mans/zorki-4/zorki-4.html
• [4] SovietCams Archive. Zorki-4 Classification. https://www.mikeeckman.com/sovietcams/index755a.html
• [5] Kamerastore. Zorki 4 Camera Specifications. https://kamerastore.com/en-eu/products/zorki-4