10 Facts About Hyperfocal distance

In optics and photography, hyperfocal distance is a distance beyond which all objects can be brought into an "acceptable" focus.

The hyperfocal distance is entirely dependent upon what level of sharpness is considered to be acceptable.

Definition 1: The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp.

Definition 2: The hyperfocal distance is the distance beyond which all objects are acceptably sharp, for a lens focused at infinity.

Hyperfocal distance is entirely dependent upon what level of sharpness is considered to be acceptable.

Concepts of the two definitions of hyperfocal distance have a long history, tied up with the terminology for depth of field, depth of focus, circle of confusion, etc.

Hyperfocal distance's drawing makes it clear that his e is the radius of the circle of confusion.

Hyperfocal distance has clearly anticipated the need to tie it to format size or enlargement, but has not given a general scheme for choosing it.

Term hyperfocal distance appears in Cassell's Cyclopaedia of 1911, The Sinclair Handbook of Photography of 1913, and Bayley's The Complete Photographer of 1914.

The hyperfocal distance is, therefore, the most desirable distance on which to pre-set the focus of a fixed-focus camera.