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Kenneth wrote:
> "Edouard Poor" <pov### [at] edouardinfo> wrote:
> 
>> I agree with Ricky - while the POV focal blur system has it's flaws, I think
>> it gets the actual blur amount in front of and behind the focal plane correct.
> 
> The concept of 'hyperfocal distance' has been with me since I was a teenager,
> when I used to shoot lots of B&W 35mm stills.  But I decided to look up the
> actual definition(!) To my surprise, there are *two* definitions, both equally
> valid (if slightly different as to the 'acceptable focus' range.) The first
> assumes setting the camera focus at a point somewhere off in the distance
> (though not at infinity) to get the maximum focus-range from 1/2 that distance
> *to* infinity. The other assumes setting the camera focus *at* infinity, which
> produces a nearly equal 'acceptable focus' range. (My own concept has always
> been the former one.)
> 
	The two definitions are the same: if you set focus at infinity the
focus range goes from H to infinity and if you set focus at H the
focus range goes from H/2 to infinity. The value of H is the same in
both cases (all other parameters being equal).

		Jerome
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http://jeberger.free.fr
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