# Hyperfocal distance - Photography

Could someone please remind me of the true definition of the term "Hyperfocal distance", please?...

1. ## Hyperfocal distance

Could someone please remind me of the true definition of the term

David Guest

2. ## Re: Hyperfocal distance

"David" <com> wrote in message

Hyperfocal distance is where you set your focus so that you're not
wasting the depth of field behind the subject (which falls beyond
infinity anyway), and so gives you closer focus in the foreground.

--
Jeff Cook
com
Cook Studios, LLC
Video Editing & Training
Aerial Photography & the Web
Based in Washington DC
http://www.cookstudios.com

Jeff Guest

3. ## Re: Hyperfocal distance

According to the glossary at Canon's EOS lens web site:

= = = = =

Hyperfocal distance

Using the depth of field principle, as a lens is gradually focused to her subject
distances, a point will eventually be reached where the far limit of the rear depth of
field will be equivalent to "infinity." The shooting distance at this point, i.e., the
closest shooting distance at which "infinity" falls within the depth of field, is called
the hyperfocal distance.

The hyperfocal distance can be determined as follows:

Hyperfocal distance =

f^2
--------
d • F

Where:
f: = focal length
F: = F number
d: = minimum circle of confusion diameter

Thus, by presetting the lens to the hyperfocal distance, the depth of field will extend
from a distance equal to half the hyperfocal distance to infinity. This method is useful
for presetting a large depth of field and taking snapshots without having to worry about
adjusting the lens focus, especially when using a wide-angle lens. (For example, when the
EF 24 mm is set to f/11 and the shooting distance is set to the hyperfocal distance of
approximately 1.5m/4.9ft, all subjects within a range of approximately 70cm/2.3ft from the
camera to infinity will be in focus.)

= = = = =

"David" <com> wrote in message
news:_lujb.389\$server.ntli.net...

RSD99 Guest

4. ## Re: Hyperfocal distance

Thanks for that ,Guys!
I understand the principle and practice, but wished to hear (or see) a
dictionary definition of the term.
Got it now!

David Guest

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