The 1424 should work fine with linescan cameras. However, you can only connect one camera to one board. You will need either two 1422 or two 1424 boards, depending on the camera's bit rate. With two separate boards, you will be able to simultaneously acquire images.
For more information about using linescan cameras and hooking them up to NI boards, I recommend talking to Robert Eastlund at Graftek (512)416-1099. He can help you figure out what cameras, lenses, cables, boards, etc. you need to use for your application.
Bruce
Bruce Ammons
Ammons Engineering