On Fri, 29 Dec 2000 17:28:10 +0100, you wrote:
>Oops. This 1/3 : 2/3 rule is a vaste simplification. The weighting
>can change dramatically with the f/stop. The change is more pronounced
>when you are approaching the hyperfocal distance (as focusing point)
>at your set aperture. There is a nice section about this topic in the lens
>FAQ, which can be found e.g. at the photo.net site.
Yes, that's why I said "roughly." Thanks for the referral! I have
printed out both the lens tutorial and the FAQ from photo.net. Quite
a bit of homework!
BTW, is the use of the carat, i.e. "f^2" meant to signify "f squared?"
I'm a little confused by the Newtonian form of the focus formula:
(Si-f)*(So-f) = f^2
Does this read: "the dist from rear principal point to the film minus
the focal length times the dist from the front principal point to the
object minus the focal length equals the focal length squared?"
Thanks
Ken
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