According to the following articles, we need a ULN2003/2803 Darlington transistor array to control a stepper motor, for moving the camera:
http://www.tigoe.net/pcomp/code/circuits/motors/stepper-motors/
http://www.adafruit.com/blog/?p=21958
This driver board might be a good option:
http://bildr.org/2011/06/easydriver/
https://www.sparkfun.com/products/10267
This might be a suitable motor:
https://www.sparkfun.com/products/9238
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