Graflex RB Series D
The Graflex RB Series D was a late member of the large format single lens reflex cameras made first by Folmer & Schwing, later by Eastman Kodak and then finally by Folmer-Graflex. The RB Series D, specifically, was built from 1928-1941 as a 3 1/4 by 4 1/4 format camera and from 1928-1947 as a 4x5 camera.
This camera is essentially a large box with a waist level finder surrounded by a tall viewing hood. A barrel lens is mounted to the front and the rear of the camera houses a large focal plane shutter. Shutter speeds are set by adjusting either the gap between shutter curtains or the tension on these curtains. These combinations may be used for up to 24 different shutter speeds, typically ranging from 1/10 to 1/1000 plus a Time mode. Additionally, the "RB" in the camera's name stands for its rotating back, where the film may be oriented in either landscape or portrait orientation without turning the camera.
When introduced, the most noteworthy innovation of the RB Series D was having the lens on an interchangeable board which allows for easy swapping of different lenses.
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