On 12/15/2009 8:11 PM, John Francis wrote:
Well, in the world where the laws of physics and optics apply, that
is nothing to do with the diopter. If there is a sharp image on the
focussing screen, but not at the same point as on the film/sensor plane,
that's caused by a problem with the placement of the focussing screen.
All the diopter does is to make it easier for your eyes to focus on the
image on the viewfinder screen. A poorly adjusted diopter can make it
impossible for you to see *anything* in focus, but it can't make part
of the image on the focussing screen appear sharper than it really is.
Since my eyesight slowly but surely deteriorates I suppose it would make
no harm for me to take a sharp lens, say FA 43 or FA 77 and auto-focus
it on something easy, say, a target recommended by Larry. Then I will
see if my diopter is set properly.
Boris
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