Most distant point on the optical axis with an image of “acceptable sharpness”
Where CoC is the Circle of Confusion (the largest accepted Airy-disk) in Millimeter.
Alternatively, we can express the FarPoint using the magnification M :
If we use for example a 1/2.5″ 5 Aptina Megapixel greyscale Sensor mit 2.2
pixel pitch, we can use the pixel diagonal as CoC for crisp images, say 
A 5 Mega lens with f=7.2mm focal length and F-stop F2.4, focused to an object distance of 100mm then has a far point of

und einen Nahpunkt von

and thus


A 5 Mega lens with f=7.2mm focal length and F-stop F2.4, focused to an object distance of 100mm then has a far point of

und einen Nahpunkt von

and thus

If instead we use a 5 Megapixel greyscale Sony Sensor with 3.45
pixel pitch, we can choose as CoC the diagonal of the pixel for crisp images, say 
A 5 Mega lens with f=7.2mm focal length and F-stop F2.4, focussed to 100mm then results in
mm
und einen Nahpunkt von

thus we get


A 5 Mega lens with f=7.2mm focal length and F-stop F2.4, focussed to 100mm then results in

und einen Nahpunkt von

thus we get

If we use a color sensor instead we can use
for crisp images. For the two sensors above we then get:




To increase the DOF we can increase the Pixel Size, but we either lose resolution, or (at the same pixel count) the magnification changes)
If you change the focal length of a lens in a way, that (with the same sensor) you get the same FOV (then from a different distance) this results in the same DOF !!!
see also https://www.optowiki.info/blog/can-i-increase-the-dof-by-changing-the-focal-length/
see also https://www.optowiki.info/blog/can-i-increase-the-dof-by-changing-the-focal-length/
When a lens is focussed to the hyperfocal distance H, the far point is at
and the near point is at
.
The DOF is
then, thus focussing to the hyperfocal distance results in the largest possible DOF.


The DOF is
