Re: hyperfocal

[Chauncey Walden <CLWalden@xxxxxxxxxxxxxxxx>]

Here's a zipped DOF routine you can play with. It came up with a
hyperfocal distance of 25 feet for a 75mm at f/22 at a resolution of 30
lines per mm. Remember that if focused at infinity, the circle of
confusion increases towards 25 feet where it reaches the selected limit.
If focused at the hyperfocal distance of 25 feet, the circle of
confusion increases from 25 feet to the selected limit at 12 and a half
feet AND FROM 25 FEET TO INFINITY. Thus, while the image remains at or
under the selected circle of confusion, more of the image will be at a
larger circle of confusion than if focused at infinity. Moral of the
story - you will get a better image if you focus at infinity at just
don't include anything closer than 25 feet.
Chauncey

dof.zip