[EricH]

Originally Posted by Greg Marra

Wow, did you guys really manage to judge distance based on the size of what the camera is seeing? I'm impressed.

We did it by mounting the camera about three feet up and using trig to calculate the distance to the tetra based on the angle of depression to it.

As far as I know, it isn't the size. It's the position that counts. Size may have something to do with it, but I don't think so.