K. G. Corfield Ltd was an innovative camera and lens manufacturing company based in Wolverhampton.
One unique design was employed in the Periflex series of cameras which utilised a novel periscope viewing system to achieve fine focus.
A miniature periscope descended into the optical path of the lens when the film was advanced.
The company also produced other photographic equipment including the Lumimeter, an exposure meter for use in the darkroom based on the comparison between reflected light from the enlarger and a variable transmitted light from the meter observed in a split screen.
When both sides were equally lit, the dial controlling the variable light showed the correct exposure.