My Xtion Pro Live can see as close as 0.5m. It is unofficial, but it's
for your reference.
Bernie
thanks alot
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Note these are actual physically measured distances from the front of
the Xtion lens, not from the front of the Zoom; so your actual physical
working distance is a bit less (2.25cm).
For reference, one of my Kinects goes down to 44cm, 32cm with the Zoom.
So the Xtion actually goes closer with the Zoom, even though it's worse
without it. Also, the Xtion makes a better, less noisy depth image
through the Zoom than the Kinect if you get the Zoom adjusted just
right. Both of them do vignette through the Zoom, although you do still
wind up with a wider field of view.
These tests were done in average nighttime room lighting (tungsten).
One interesting thing is that both cameras take a while to figure out
the depth image, maybe up to 30-40 seconds after it's started sending
data where it's almost all black. Some kind of calibration must be
going on that adapts to the lens.
Good luck!
- Lorne