On 01/10/2015 10:36, whisky-dave wrote:
On Wednesday, 30 September 2015 23:00:01 UTC+1, dennis@home wrote:
On 30/09/2015 17:07, whisky-dave wrote:
Wrong.
mine is ON THE CAMERA but to understand this with film you have to know what the mark represents.
Nothing to do with DoF.
As to the two marks, my first thought is visible and infra-red, unless they
are for the two extremes of a zoom lens (narrower DoF for same aperture at
longer focal length). For visible/IR, I presume as well as two DoF marks
there are two focus marks and that the different pairs of DoF marks are
roughly equally spaced about the respective focus mark.
No.
Have I understood your question correctly? Are the two sets of DoF marks
(and also the marks for the different focus points) in different colours?
That's usually the convention for visible/IR.
I have a canon A1 film camera.
http://tinyurl.com/phjla58
just to the left of the hotshoe the symbol that looks s little like the london underground logo.
This is the DoF mark, for the camera,
it's Not Depth of Field, but Depth of Focus.
It only appears on film cameras (perhaps not all) it is where the film will lay aka film plane.
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?
Have you corrected them yet?
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.
Oh and look they the mark on digital cameras too
http://www.dpreview.com/reviews/Olym...s/inhand02.jpg
yep shows where the film or sensor plane is.
Yes I have one of these to go with my Pentax MX and Sony a580 which also
have them.
You really don't know about cameras do you?
mORE THAN YOU IT SEEMS.
So how come you keep getting stuff wrong?