On Thursday, 1 October 2015 13:00:49 UTC+1, dennis@home wrote:
On 01/10/2015 10:36, whisky-dave wrote:

I think it was a hang on from the old days before SLR focusing.
This mark has NOTHING to do with the lens attached unlike Depth of Field.



So why do you insist on calling it DoF,

I don;t insist, that;s what other have called it.

Who?

Anyone that knows about what photography is.
Those that think smart phones invented photography need educating.


Have you corrected them yet?

you're the one that needs correcting.




its not depth of focus either it
is just the position of the film plane which you need to know if you are
using a tape measure to set focus like you might for macro work.


BTW depth of focus depends on the lens attached, you should read more
http://www.usa.canon.com/cusa/profes...nge_depthfield

for video work.

Irrelevant, they are the same.

they are NOT the same.

DEPTH OF FIELD - The range of object distance within which objects are in satisfactory sharp focus, the limits being the establishment of a circle of confusion of greatest acceptable size.
DEPTH OF FOCUS - The range through which the image plane (the emulsion of the film) can be moved backward and forward with respect to the camera lens such as defined under the depth of field and circle of confusion. This term is often confused with depth of field and vice versa.

In common English, Depth of Field is what the photographer is interested in; it is what is in acceptable focus in front of the lens. Depth of Focus is what only a technician is interested in; it is what is in focus behind the rear lens element which the film or image sensor "sees."


So how come you keep getting stuff wrong?

I don't.