Re: focusing in monochromatic light

[T3D john bercovitz <bercov@xxxxxxxxxxx>]

John Merritt writes:

> John B wrote about yellow glasses and monochromatic light.  I suspect
> these glasses are not monochromatic, but rather a blue cut-off
> filter.  

How much could I learn with a dense flint equilateral prism?

> I haven't kept up on this area, but I recall that the visual system
> is not wired for detail in the blue end of the spectrum, so by
> cutting off the blue light, perhaps the detail-analyzers have
> a cleaner signal?

So I guess there's a question as to whether it's blue balanced against
red for focus?

> I don't know of depth acuity (to relate this to Tech3D) data
> where spectral bandwidth is a factor, but haven't searched for it.
> It might be interesting to test depth acuity at a distance in
> the presence of haze, with and without minus-blue filters.

Sounds interesting to me.

John B


------------------------------