# WHY??? Do you insist on the shallowest depth of field in every photo?

Started Mar 14, 2013 | Discussions thread
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 Correction: For Richarddd In reply to Detail Man, Mar 17, 2013

Detail Man wrote:

richarddd wrote:

How about the relation between DOF, CoC and blur spot?

Hyperfocal Distance (in units of Meters):

HFD = (L^2 / (FC) ) + L

where:

L is the Effective Focal Length (in units of milliMeters);

L is the Focal Length (in units of milliMeters);

F is F-Number;

C is COC diameter (in units of Microns)

.

Depth of Field (in units of Meters):

DOF = (2D) / ( HFD/D - D/HFD )

where:

D is Camera to Subject Distance (front nodal plane to plane of focus);

HFD is Hyperfocal Distance.

.

Approximate DOF (maximum 11% error on the low side at 1/3 of the Hyperfocal Distance):

DOF ~ (2FC) (D/L)^2

where:

F is F-Number;

C is COC diameter (in units of Microns);

D is Camera to Subject Distance (front nodal plane to plane of focus);

L is the Effective Focal Length (in units of milliMeters);

L is the Focal Length (in units of milliMeters).

.

A good reference about the thin lens formula and Effective Focal Length is at:

http://www.panohelp.com/thinlensformula.html

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