Agat 18K is a 35mm film half frame viewfinder camera made by Vilejka for MMZ (Belomo), Minsk, Belarus (in former USSR), and produced between 1988-97. АГАТ = AGAT is a special name in Russian.
Camera identical to its predecessor, Agat 18 with some technical improvements. The camera is one of the smallest and definitely the lightest half frame 35mm cameras that you can buy. Vilejka logo on the lens Frame size 18x24mm Lens: Industar-104 (ИНДУСТАР), 28mm f/2.8, glass triplet lens, filter slip-on Aperture: up to f/16 Setting: The camera is totally manual, though not in the typical sense, since it works only in a "mechanical program mode" were you first set the film speed and then just use the "sunny-16" icons on the front dial. The camera adjusts both aperture and shutter speed for a perfect exposure (it actually works quite well). Film speed: ISO 25-1600, set via the inner ring beneath the lens Focus range: 0.9-5m +inf Focusing: manual front cell focusing Shutter: leaf shutter; speeds: 1/65 -1/540 not written on the scale, instead there are weather symbols, set the ring as to the actuall situation of weather Shutter release: on front of the camera, not works wo/ the film in the camera, w/ cable release socket Cocking knob: also winds the film, double exposure prevention, on the left of the camera Frame counter: auto-reset, additive type, window on the left side of the camera Viewfinder: bright frame, w/ parallax correction lines Re-wind lever: folding crank, on the left side of the camera Re-wind release: a button on the winding knob, set to red dot Flash PC socket: none Hot-shoe: there was a cover on it Self-timer: none Back cover: removable, with the right side of the camera, opens by a latch on the right side Tripod socket: ¼", also usable as a hand strap socket Hand strap Body: plastic, shutter compartment metal; Weight:132g Serial no. first two digits show the production year, in the camera shutter work,Aperture work full work