T3D Re: Panum's limit

[john bercovitz <bercov@xxxxxxxxxxx>]

> They are saying it not me

Yeah, I know.  8-)  I should have said, "Are you saying that they are 
saying that..."  8-)

> you seem to have answered your question yourself based on what I said 
> below.

Thanks for the confirmation.

> What I think they are saying is that if you go straight in cold over 
> 6' you don't get stereo fusion but if you start at 6' or less then 
> increase it while viewing you can maintain fusion up to 120' or a 
> little over.

Well put.

> I will take your word for the 2 degrees figure I have not measured 
> the angle myself or even sure how to do it.

The viewer lens might be 35 mm (for an ortho viewer) to 45 mm and the 
line separation should be 1.2 mm.  2arctan(1.2/2/35) = 2 degrees.

>  It does seem to contradict Panum's findings that his phenomena 
> appears to work with these 2 degree separated lines.

I haven't tried the lines by themselves in a viewer.  Sounds like an
excellent experiment and not hard to do - just put a gauge in the 
viewer.  Better yet, since the viewers in real life had focal lengths
around 45 mm, to get two degrees, we need a separation of 1.6 mm.

Have a good holiday.

John B


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End of TECH-3D Digest 290
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