Ed,
You can do the stereo acuity estimation for yourself.
https://en.m.wikipedia.org/wiki/Stereoscopic_acuity
Obviously you need to do it in such a way as other visual cues for spacing are avoided. The base of the pegs may need to be hidden and shadows avoided of course.
I got my wife to stick a pair of old knitting needles in the lawn separated by different distances, and then just walked towards them, with and without binoculars, until I could just distinguish which was closer. You then just measure d and dz. Crude, but it worked well enough and took less than 10 minutes including the calculations to give a totally unambiguous answer.
Give it a go.
David
You can do the stereo acuity estimation for yourself.
https://en.m.wikipedia.org/wiki/Stereoscopic_acuity
Obviously you need to do it in such a way as other visual cues for spacing are avoided. The base of the pegs may need to be hidden and shadows avoided of course.
I got my wife to stick a pair of old knitting needles in the lawn separated by different distances, and then just walked towards them, with and without binoculars, until I could just distinguish which was closer. You then just measure d and dz. Crude, but it worked well enough and took less than 10 minutes including the calculations to give a totally unambiguous answer.
Give it a go.
David
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