SPD(OPCS)		Optical Printer Control System		SPD(OPCS)

    NAME
        spd - set the camera's exposure speed

    USAGE
	spd [speed]           # set CAMERA's exposure speed
	spd [+-/*][speed]     # relative adjust current exposure speed

    EXAMPLES
	spd .30               # set camera's speed to .30 second
	spd +.1               # add 0.1 to current camera speed

    DESCRIPTION
        This command sets the camera's exposure speed.
	
	Speeds can also be adjusted relative to the current speed by adding
	a prefix to the numeric speed value with one of the following:

                Prefix  Description                        Examples
		------  ---------------------------------  --------
		  +     Add value to current speed         spd +.10
		  -     Subtract value from current speed  spd -.10
		  *     Multiply current speed by value    spd *2.0
		  /     Divide current speed by value      spd /2.0
	
	This is useful for wedging camera exposures. EXAMPLE:

		spd .20 do 9 cam 1 spd +.10

	..this will shoot a 9 frame exposure wedge for the camera speeds 
	at .10 increments, from .20 thru 1.0.
	
	The equivalent commands without the 'do 9' loop would be:

		spd .20 cam 1
		spd .30 cam 1
		spd .40 cam 1
		spd .50 cam 1
		spd .60 cam 1
		spd .70 cam 1
		spd .80 cam 1
		spd .90 cam 1
		spd 1.0 cam 1

	Depending on how SPD(OPCSDEFS) is configured in OPCSDEFS.OPC,
	the speed values can be ROTATIONAL speed, or an EXPOSURE speed.
	See SPD(OPCSDEFS) for details.

    SEE ALSO
	SPD(OPCSDEFS)       - setting default speeds for motors
	RAMP(OPCSDEFS)      - motor ramping maximums
	MRP(OPCSDEFS)       - maximum ramping pulses for the shutter
	SPDINTERP(OPCSDEFS) - set auto-interpolation for exposure speeds

    HISTORY
        The '+' prefix (e.g. 'spd +.1') was added in OPCS version K1.12E.

    ORIGIN
	Gregory Ercolano, Los Feliz California 11/29/89