Specifications

Parameter 	Value 	Comments
Maximum stacking depth 	52.5 mm 	Approximately. The precise number will depend on your placement of the two micro-switches.
Maximum speed 	10 mm/s 	Even higher speeds might be possible (~20 mm/s), but emergency breaking acceleration (which grows as the square of the maximum speed) will become too high for the rail's hardware
Time to rewind from one end to the other	6s 	Moving at the maximum speed and acceleration
Breaking distance 	1 mm 	When travelling at the maximum speed
Time to speed up or break 	0.2s 	Time to get to the maximum speed and break when moving at the maximum speed and acceleration
Smallest step 	0.63 μm	One microstep
Backlash 	200 μm 	Loss of accuracy when switching the direction of the motion; not cumulative. Starting from s0.10 the backlash is fully compensated. Starting from s2.0 backlash can be compensated in either direction. (So camera can be pointing up or down.)
Minimum distance between frames 	0.63 μm	Corresponds to one microstep of the stepper motor
Maximum distance between frames 	5000 μm	Can be set to higher in software (MSTEP_MAX) if needed
Minimum framerate 	0.01 fps 	Can be set to any other number in software (FPS_MIN) if desired
Maximum framerate 	4.5 fps 	Can be set to any other number in software (FPS_MAX) as long as your camera and flash can handle it
Minimum number of shots 	2 	In 1-point stacking
Maximum number of shots 	9999 	In both 1 and 2 point stacking
Maximum number of stacks 	999 	In timelapse mode (N_TIMELAPSE_MAX)
Maximum interval between stacks 	9999 s 	In timelapse mode (DT_TIMELAPSE_MAX)
Maximum total timelapse length 	50 days 	This is the limit of the Arduino's millisecond accuracy timer, millis()
Number of memory registers 	5 	Each register can store the whole current state of the rail
Minimum input voltage 	9V 	Depends on the mass of your camera/lens; at lower voltage the stepper motor will start skipping steps
Maximum input voltage 	15V 	15V is the absolute maximum input voltage for the voltage regulator.
Maximum load 	>1.0 kg 	Maximum weight which can be moved by the rail without skipping the steps, at any angle (including moving the camera up vertically). I haven't tested >1 kg cases.
Weight, total 	1.41 kg 	Including Velbon Mag Slider rail with the sideways motion module and 8 AA Eneloop batteries
Weight, motor unit 	888 g 	Including Velbon Mag Slider with the sideways motion module; just the motor unit weighs 424 g
Weight, controller unit 	518 g 	Including 8 AA Eneloop batteries
Can be adjusted in the software