(Stating the obvious) the viewing lens is what you are looking through when using the ground glass reflex
viewfinder; the taking lens actually determines what goes on the film. The "f-stop" or aperture is set by
the little tab that also serves as an indicator on the adjacent scale. The numbers are a ratio of lens diameter
to focal length. The smaller numbers are larger diameter and let in more light. With the exception of the 3.5
to 4 step, the steps represent a factor of two in light intensity. Moving from f11 to f8 doubles the exposure,
all else unchanged. The ring with the milled edge sets the shutter speed. The indicator mark is set via the
adjacent scale. The numbers represent reciprocal values: 200 is 1/200th of a second, 10 is 1/10th of a second,
etc. (assuming the shutter is working!) B and T are Bulb and Time. With B, the shutter stays open as long as
the release is held down. With T, the shutter opens when the release is actuated once; then closes when the
release is actuated again; handy for really long exposures. As with the lens openings, the shutter speed
steps are approximately in a two to one ratio. The cable socket takes a standard mechanical cable release
to reduce vibrations when triggering the shutter (assuming the camera is on a tripod). To fire the shutter,
it must first be cocked by pulling the cocking lever down toward the shutter release lever. The small
button and lever at about 4 o'clock on the shutter is a self timer; moving it clockwise will insert about a
ten second delay so you can jump into the picture! The semi-circular scale below the lens/shutter assembly
indicates distance (in feet, for this particular camera). Focus is set by moving the large chrome knob focus
lever to the desired distance or by moving it while observing focus in the ground glass of the reflex viewer.
NOTE: There is no double exposure prevention!