   hyperfocal distance & depth of field calculator  35mm (7 x 11 Print) 645 (8 x 10 Print) 6x6 (9 x 9 Print) 6x7 (8 x 10 Print) 6x9 (7 x 11 Print) 6x12 (6 x 11 Print) 6x17 (4 x 12 Print) 4x5 (8 x 10 Print) 5x7 (7 x 10 Print) 8x10 (8 x 10 Print)
 Enter the Focal Length of your lens Enter an f-stop  Set your focus in meters to — This is your Hyperfocal Distance. Depth of Field extends from — meters in front of your lens to infinity. For calculations in feet click here.

Following are Hyperfocal Distance and Circle of Confusion calculations using standard 35mm format;

Since a normal human eye can resolve 5 lines per millimetre at a distance of 25cm, and the diagonal measurement of a 7 x 11 print (for an uncropped 35mm frame) is 330mm, then; Diagonal of print in millimetres Diagonal of film format in millimetres x 5 = Resolution Factor

35mm film's diagonal measurement is 43mm, therefore the Resolution Factor = 38.372 1 Resolution Factor = Circle of Confusion

The Resolution Factor enables us to calculate the Circle of Confusion of .026 for 35mm. Focal Length 2

Circle of Confusion per Format x Aperture
= Hyperfocal Distance

The Circle of Confusion for 35mm is .026, so if your 35mm format lens has a focal length of 50mm and the aperture is set to f8, then the Hyperfocal distance is 12019mm (12 meters or approximately 39.4 feet).

So, if you're using a 35mm camera with a 50mm lens and you set your aperture to f8 and your focus to
39.4 feet (or 12 meters), subjects that are between half this distance (19.7 feet or 6 meters) and infinity,
will be acceptably sharp on a 7 x 11 print.  