P2V and Ziggi-HD essentially serve a similar purpose but different needs.
The P2V is more of a portable device as its name suggests: Point to View, where you could use it in a variety of ways and detach the camera head to shoot in more angles as you seem fit. This would be great for Art and Science classes where you may have to be projecting objects that are not a flat surface. There are also more accessories for P2V which prepares P2V for different type of tasks.
The Ziggi-HD, our latest addition is geared more towards a stationary type of presentation needs. We've made some design modifications so the stand on the Ziggi is taller, thus capturing A4 size documents more easily than using a P2V. The improved HD camera lens gives Ziggi-HD a decisive advantage over P2V resolution wise. Plus the new 6x zoom, Ziggi-HD is perfect for capturing fine detail on a larger document/material. The Ziggi-HD also comes with an anti-glare shield, which attaches to the camera and reduce the light reflection directly over, say a tablet device, which could create a glare on the screen.
Both models are small and portable USB powered document cameras, and it is really how the teachers use the cameras that would determine which model is a better fit.
Please check if your computer's video ram matches the system requirement:
PC - 64MB of dedicated video memory for 5M (2592x1944)
Mac - 144MB of dedicated video memory for 3M (2048x1536)
256MB of dedicated video memory for 5M (2592x1944)
Not only the exposure keys, other keys do not work while Ziggi-HD is focusing, either. Please wait till Ziggi-HD successfully finished the focus action before pressing the keys.
At higher resolution, the FPS (frame per second) will drop, thus slowing down the focusing speed as well. Please toggle to single focus mode and switch to a lower resolution to quickly find the sharp focus, then switch the resolution back up for better image quality.
Due to USB bandwidth limitation, 2592X1944 can only run at very low FPS (frame per second), thus is recommended for objects with less movements only.
Please enlarge the color or brightness contrast near the center of the shooting area (marked by a green box when focusing) then try focusing again with Ziggi-HD.