--- Ken Durling <[EMAIL PROTECTED]> wrote:
> Seems to me the most consistent spoiler of AF is
> lack of contrast, 
> and that would hold in dim light.  But however, that
> doesn't go far 
> in explaining the f/5.6 or f/8 limits, although I do
> like the 
> geometry explanation.

2/1000: The last 3 paras on last page (page 17 of 17)
of this (IMHO) very good document touches about
importance of aperture:

http://doug.kerr.home.att.net/pumpkin/Split_Prism.pdf
(or http://tinyurl.com/6ykox)

I think I understand some of it a wee bit better now.

FWIW, I got this off here:
http://en.wikipedia.org/wiki/Autofocus
(or http://tinyurl.com/74gv4)

- Harman


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