Hello Everyone. thanks for all the help. I am close to getting
it... A simplified formula for the hyperfocal length is: usually
d/D is very small so d= diameter of accepted, maximum circle of
confusion (set a priori) F= focal length of positive lens D=
lens diameter So, the hyperfocal length is farther out if the
focal length increase and if the circle of (maximum) confusion
is set to be small. Let's do a numerical example: d= 1 mm=0.1 cm
f#= 3 (focal length is 3 times the lens diameter). H= 4/ (.3)=
13.3 cm So the DOF goes from 6.65cm to "infinity". Infinity will
include all those object distances where the objects are still
imaged (not too small to be imaged as points). The circle of
confusion at distance 6.65 cm is 1 mm. The circle of confusion
at "infinity" is also 1 mm. The circle of confusion at H=13.3 is
0mm (ignoring diffraction). Now, focusing at infinity instead of
focusing at H: the circle of at infinity is 0 mm. What distance
can we call infinity in our example? Let's call that distance
INF. As we