Corfield Periflex
The Periflex 35mm camera was launched by K. G. Corfield Ltd, England in May 1953 as the first and original model from this source. The camera resembles the Leica Standard and qualifies fully as a Leica copy. However, film loading is by way of a removable back, and it provides through the lens visual focusing using an inverted periscope to be lowered into the light path between the lens and the film, utilising the single-lens reflex principle, showing a small section from the lower middle of the full image. The Periflex became quite popular in Britain  and several improved models were introduced during the ensuing years until their demise in the early 1960s. Description. The body is made of black painted metal alloy castings, while the top and base-plates are of black anodised stamped aluminium with delicate engravings. The covering material of the first two hundred units or so were brown pigskin, while all later ones were finished in black leather cloth because the pig skin stained easily. Also for this reason, whenever a camera was returned to the Wolverhampton works for service, the brown covering would be replaced without charge, if the owner so  desired. The knobs and controls on the top-plate are turned and milled from solid aluminium. Engraved numerals and arrows in the top plate indicate their respective function and mode of operation. A semiautomatic decrementing frame-counter is built into the wind-on knob visible through a small cutaway window in the knob. A small button next to it, which also doubles as a film rewind release, allows the wind-on knob to be turned back and forth to set the frame counter to the number of frames remaining on the loaded film. The optical viewfinder, with individual eyesight adjustment , is mounted in an accessory shoe slightly offset to the left-hand side on the top plate. It matches the field-of-view of the standard 50mm camera lens. It may be replaced by separately available ones matching the field of view of interchangeable lenses of the photographer's choice. The built-in focusing aide is situated centrally on the top plate. It is lowered manually into the light pass behind the camera lens and held in position against spring tension by pushing a small knob on the side of the periscope to its down position. The motive is  shown magnified on a focusing screen inside the periscope, making it particularly useful for macro and copy work. The cloth focal-plane shutter provides speeds from 1/30 to 1/1000 sec. and B. The shutter release button is situated on the right-hand camera front externally threaded for Leica cable release. The shutter control is the small milled knob on the top with numerals from 30 to 1000 and B engraved around it. It serves dual purposes, for winding the shutter in a single anti-clockwise motion until a catch arrests it, and thence as a lift and turn type shutter  speed selector. A standard coaxial flash synchronising socket is situated at the front of the camera, below the shutter release button. The camera back is removable for changing film. A milled button next to the tripod socket rotates either way to lock the back, while in a position in between it is unlocked. The back comes off downwards as a single unit including the base-plate. A quite small film-pressure plate of thick glass is mounted on a piece of rubber foam on the back. Inside the camera, on the left-hand side, is the 35mm film cassette  chamber, and to the right is the counter clockwise rotating film take-up drum. It has a narrow slit for the film leader, and it rotates freely whenever the small film rewind button on the top plate is depressed. No sprocket wheel is employed; instead, the film is pulled by, and wound onto the drum that always rotates the same angular amount for next picture frame. Acceptable frame spacing is accomplished by the large diameter take-up spool that reduces the effect of increasing spool diameter as more film is wound onto it. The Periflex was sold with a "Corfield  England Lumar f=50mm 1:3.5" standard lens in a bright aluminium barrel. Corfield had the British Optical Lens Company calculate the three element Cook design which proved to be quite satisfactory, and subsequently became the manufacturer and supplier of the coated glass elements, while Corfield turned, cut and milled the barrels, and completed the lenses in their premises. The original Periflex has the engravings directly in the black anodised aluminium top and base plates. The first few hundred cameras were covered in brown pigskin, which proved difficult to mount in production without getting glue stains on it, so it was  soon changed to black leather. Some time after that the engraving of the top plate was dropped and instead an engraved disc was placed under the shutter speed dial. "Corfield / Periflex / England" was engraved on the front of the periscope housing. After about one and a half year of manufacture, the top and base plate finish were changed to bright anodised aluminium. All later standard models were finished in bright aluminium and black leather. The Periflex was replaced by the largely reworked Periflex 3 in 1957, and a year later complemented by the economy model Periflex 2. External links. British  Optical Lens Company by David Gardner: http://www.gbcameras.org.uk/VP%20Twin/Company%20History.htm