19104 Loc: Philadelphia

DoesAnybody no of a chart that this depth of focus 4 different lenses

Architect1776 Loc: In my mind

Didn't try these but Google has a lot of them.

http://cpn.canon-europe.com/content/education/technical/depth_of_field_calculator.do

http://www.photopills.com/calculators/dof

http://www.cambridgeincolour.com/tutorials/dof-calculator.htm

Apaflo Loc: Anchorage, Alaska

Depth of Focus is not the same as Depth of Field.

Architect1776 Loc: In my mind

You are right, it is not, but the poorly written question this was an assumption made.
But it is not a factor generally adjustable by a user and is generally fixed in the physical design of the camera. There is really not much that can be done about it. I guess if you are making a camera this might be an issue or ripping a lens apart to place it on a different camera brand as well.
But this did not seem to be the way this was worded so an assumption was made that the OP was actually asking for depth of field vs the physical construction of the lens to film (sensor) tolerance distance.

From Wikipedia, the free encyclopedia

Depth of focus is a lens optics concept that measures the tolerance of placement of the image plane (the film plane in a camera) in relation to the lens. In a camera, depth of focus indicates the tolerance of the film's displacement within the camera, and is therefore sometimes referred to as "lens-to-film tolerance."

The phrase depth of focus is sometimes erroneously used, to refer to the depth of field (DOF), which is the area in front of the lens in acceptable focus, whereas the true meaning of Depth of focus refers to the zone behind the lens wherein the film plane or sensor is placed to produce an in focus image.

Depth of focus can have two slightly different meanings. The first is the distance over which the image plane can be displaced while a single object plane remains in acceptably sharp focus;the second is the image-side conjugate of depth of field. With the first meaning, the depth of focus is symmetrical about the image plane; with the second, the depth of focus is greater on the far side of the image plane, though in most cases the distances are approximately equal.

Where depth of field often can be measured in macroscopic units such as meters and feet, depth of focus is typically measured in microscopic units such as fractions of a millimeter or thousandths of an inch.

The same factors that determine depth of field also determine depth of focus, but these factors can have different effects than they have in depth of field. Both depth of field and depth of focus increase with smaller apertures. For distant subjects (beyond macro range), depth of focus is relatively insensitive to focal length and subject distance, for a fixed f-number. In the macro region, depth of focus increases with longer focal length or closer subject distance, while depth of field decreases.

Determining factors
In small-format cameras, the smaller circle of confusion limit yields a proportionately smaller depth of focus. In motion picture cameras, different lens mount and camera gate combinations have exact flange focal depth measurements to which lenses are calibrated.

The choice to place gels or other filters behind the lens becomes a much more critical decision when dealing with smaller formats. Placement of items behind the lens will alter the optics pathway, shifting the focal plane. Therefore, often this insertion must be done in concert with stopping down the lens in order to compensate enough to make any shift negligible given a greater depth of focus. It is often advised in 35 mm motion picture filmmaking not to use filters behind the lens if the lens is wider than 25 mm.

Calculation
If the depth of focus relates to a single plane in object space, it can be calculated from

{\displaystyle t=2Nc{\frac {v}{f}}\,,} t=2Nc{\frac {v}{f}}\,,
where t is the total depth of focus, N is the lens f-number, c is the circle of confusion, v is the image distance, and f is the lens focal length. In most cases, the image distance (not to be confused with subject distance) is not easily determined; the depth of focus can also be given in terms of magnification m:

{\displaystyle t=2Nc\left(1+m\right)\,.} t=2Nc\left(1+m\right)\,.
The magnification depends on the focal length and the subject distance, and sometimes it can be difficult to estimate. When the magnification is small, the formula simplifies to

{\displaystyle t\approx 2Nc\,.} t\approx 2Nc\,.
The simple formula is often used as a guideline, as it is much easier to calculate, and in many cases, the difference from the exact formula is insignificant. Moreover, the simple formula will always err on the conservative side (i.e., depth of focus will always be greater than calculated).

Following historical convention, the circle of confusion is sometimes taken as the lens focal length divided by 1000 (with the result in same units as the focal length);[2][3] this formula makes most sense in the case of normal lens (as opposed to wide-angle or telephoto), where the focal length is a representation of the format size. This practice is now deprecated; it is more common to base the circle of confusion on the format size (for example, the diagonal divided by 1000 or 1500).[3]

In astronomy, the depth of focus {\displaystyle \Delta f} \Delta f is the amount of defocus that introduces a {\displaystyle \pm \lambda /4} \pm \lambda /4 wavefront error, and can be calculated using[4][5]

{\displaystyle \Delta f=\pm 2\lambda N^{2}} \Delta f=\pm 2\lambda N^{2}.

Apaflo Loc: Anchorage, Alaska

You need to actually read (carefully) the wiki article and make an effort to understand what it is saying. Virtually all of what you have concluded, as stated above, is incorrect.

This statement from the cited article is the operative point to realize while reading the rest of it. "The same factors that determine depth of field also determine depth of focus, but these factors can have different effects than they have in depth of field."

A Google search turns up many articles about Depth of Focus, and reading several of them would be beneficial if for no other reason than it will help get past the errors in the wiki article...

Architect1776 Loc: In my mind

What assumptions?

In simple terms as I previously stated so you can understand.

Depth of Field/Focus Conundrum
I was surprised to see the misstated comments on Depth of Field vs. Depth of Focus in the June 2007 Your Tips get past your editors. To clear things up, here are the definitions of the two phrases from The American Cinematographer Manual (4th edition, 1973, page 625).

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."

Apaflo Loc: Anchorage, Alaska

As stated, all of the conclusions you made about Depth of Focus, as opposed to the text quoted from the wiki article.

SharpShooter Loc: NorCal

I just want to know if the OP's handle is his prison number?!?! LoL
SS

Rongnongno Loc: FL

I would not worry about the whale.

Apaflo Loc: Anchorage, Alaska

The later edits to that post do not support nor agree with what you had posted in your previous article. Even so, you should have provided the source, which was at https://www.videomaker.com/article/d2/13086-the-difference-between-depth-of-field-and-depth-of-focus .

Quoting letters to the editor, even if correct, is not a suitably reliable source.

But the problem remains that this cite did not support what you had previously said. And you won't find any credible source that does support your comments.
That is no more true of Depth of Focus than it is of Depth of Field. As previously noted the appropriate consideration was stated in the wiki article: "The same factors that determine depth of field also determine depth of focus, but these factors can have different effects than they have in depth of field." Depth of Focus is just as adjustable by the user as is Depth of Field. It is not "fixed" and it is not just the "physical design of the camera".

The camera, the lens, and the user determined focus distance and aperture all affect both Depth of Focus and Depth of Field.

Further statements such as these are purely frivolous:

The necessary point is to understand what credible sources actually say.

19104 Loc: Philadelphia

no its your moms prison number. Rofl.

SharpShooter Loc: NorCal

No it's not!
I KNOW my moms prison number, and that wasn't it!!!
But hey, we're making progress, at least now we know you're Rolf. Now you just need to give us a clue what you were asking?! LoL
SS

Donwitz Loc: Virginia Beach, VA

If you are interested in finding the distance from your lens where your photo will be in focus, try the Photo Buddy App. It will give you information based on your camera's make and lens. It has other functions, too. Check with the site where you buy apps.

Macronaut Loc: Redondo Beach,Ca.

Yup! Even when you are right, he will be "more" right.....always

tdekany Loc: Oregon

This is your answer to verify your OP? Wow. You seem to really appreciate other people's time.