P3D Re: Zero magnification?

["Greg Wageman" <gjw@xxxxxxxxxx>]

From: Tom Hubin <thubin@xxxxxxxxx>


>Unity magnification is arbitrarily defined as something like a viewing
>distance of 10 inches. I do not recall the actual distance. But it is a
>practical value for as close as you can view with the normally
corrected
>adult human eye comfortably.


That's correct.  The usual number used in calculations is 250mm, which
is awful close to 10 inches (10 times 25.4 mm/inch is 254 mm).

>Regarding zero magnification, that would produce a zero size image. I
>did not read the original post but perhaps unity magnification was
>intended.


Exactly.  I was going to point this out if no one else did. :-)

     -Greg W. (gjw@xxxxxxxxxx)