"B" (Bulb) photography
When making photographs of starts, or other photography at
night requiring long exposure times (1 second or longer), set
the shutter selector to "B" (Bulb). In this mode, the shutter
will remain open, and the film will be exposed, for as long as
the shutter release button is held depressed. In this case,
camera shake is inevitable with hand-held photography, thus
the camera should always be mounted on a tripod, or rested
on a solid surface to keep.it immobile. To further remove any
possibility of camera shake, the Cable Switch S (optional
accessory) should be connected to the camera. Inside the
viewfinder, the LED will flash at the "B" position, and when
appropriate, another LED will light steadily beside the shutter
speed appropriate for the aperture which has been set.
Release socket
<Release Socket> This may be used to attach remote control devices
such as the Cable Switch S. Infrared Controller S. Radio Controller,
etc., or as a contact for connecting the Auto Bellows or the RTF 540
flash unit. The socket receives electrical signals from these
accessories which are used to operate the shutter.
· Do not connect an ordinary cable release (mechanically operated
type) to this release socket as this can cause damage to the socket
device.
<Infrared Compensation Mark> With infrared film (and a red
filter) it is necessary to correct focusing for the long length of the
infrared rays, since even if focusing appears correct within the
viewfinder, it will be off at the film plane. Both Yashica ML and
Zeiss T. lenses have an infrared compensation mark or red dot on the
depth-of-field scale on the lens barrel (mirror lenses do not have this
mark because they do not require any correction). First use the
normal focusing procedure, then turn the focusing ring until the
distance at which you have focused is opposite the red compensation
mark.
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