I think all this is just splitting hairs!
(sorry, couldn't resist that.)
RK
Matthias Wilke wrote:
> Hi,
>
> ...possible to focus a human hair in 3 feet distance with the split image
> of a SLR focusing screen, too. There is a further point to consider: You
> can see a hair if it is far below the resolution of your eyes, if the hair
> is bright illuminated in front of a darker background. This is the
> principle of the dark field and the ultra microscopy. In dark field, you
> can see things beyond the resolution of the microscope, but you can't see
> its shape. The shape of a human hair at a greater distance is not so
> interesting you will miss it, but you still see and know, that it is a long
> subject (you probably think, that you see this hair sharp, because you know
> very well how a single hair looks like).
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