I just acquired a used / old iSight camera A1023 it uses a firewire 400 port. I was wondering if there was a way to connect this to the raspberry pi so I can take pictures with it.
The connection part is easy, just use a Firewire to USB adapter. The trickier part is finding software that supports this camera. According to Wikipedia the driver for the iSight camera is included in Linux kernel 3.0 and up, but this seems to work only for the internal iSight cameras. This help article describes the process to make the external camera work on Ubuntu, you might be able to do something similar in Raspbian (or get it to work on the RPI2 version of Ubuntu MATE). It will likely involve some tweaking, and you will need access to a working version of OSX to retrieve the firmware.