"B" ...... (Bulb) In this position, the shutter remains open for as long as the shutter release button is depressed.
"X".....
(Flash Sync-Speed) In this position, electronic flash units other than the CS-201 Auto (or Contax
TLA20, TLA30) can be used for making flash exposures. The flash sync-speed is set at 1/100 second.
Aperture Ring
The aperture ring regulates the amount of light transmitted to the
film plane. The amount of light transmission is halved when the
aperture is changed to the next larger F value (for example, when
f/4 is changed to f/5.6), and doubled when it is changed to the
next smaller f value. The aperture also controls the depth of field,
a lens property giving you varying depth in the plane of focus at
different apertures. (Refer to page 76) To set the aperture, turn
the aperture ring until the desired aperture setting is aligned with
the aperture/distance scale index. The aperture ring can be used
at in-between positions. With the exception of PC Distagon and
mirror lenses, all Yashica and Zeiss interchangeable lenses
feature automatic diaphragms that stop down the selected
aperture when the shutter is activated. Thus, your viewfinder
always gives you a bright image at full aperture of the lens
used.
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