Ricoh Lens A16 - Manual (Page 21)

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M: Manual Exposure Mode
You can select between B (Bulb) and T (Time) for the shutter speed.
With B, the image is exposed while the shutter release button is pressed
and exposure ends when the button is released. With T, exposure starts
when the shutter release button is pressed and ends when it is pressed
again. In either mode, the camera stops shooting compulsorily once 180
sec. has elapsed.
[Auto] and [Auto-Hi] of the ISO setting can also be used.
Note --------------------------------------------------------------------------------------
B and T can both be operated using the optional cable switch (CA-1).
Addition of Scene Modes
[Miniaturize], [High Contrast B&W], [Soft Focus], [Cross Process], and [Toy
Camera] have been added to Scene Mode.
Vignetting can be set in [Cross Process] and [Toy Camera].