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Depth Of focus?
Hello,.

I knw what depth of field is and factors affecting it.But I dnt quite get what exactly depth of focus and how does it affect a pictureIf sumone can explain in simple terms it would be great?.

Thanks.

I m not young enough to know everything - Oscar Wilde..

Comments (8)

Although this image is in regards to television, the graph was the best that I could find and does the best to explain Depth of Field & Depth of Focus..

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

From: http://www.usa.canon.com/html/industrial_bctv/ERC/calculator2.html..

Comment #1

Eclipse Optics wrote:.

Although this image is in regards to television, the graph was thebest that I could find and does the best to explain Depth of Field &Depth of Focus..

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

From: http://www.usa.canon.com/html/industrial_bctv/ERC/calculator2.html.

Or to put it into words, "Depth of Focus" applies inside the camera - at the focal plane. It may have been more important in the use of film cameras, where a slight curvature or variation from flatness in the film could be accommodated within this very shallow zone..

For most purposes we are usually much more interested in "Depth of Field" which is outside the camera, in the real world where the actual subject is.Regards,Peter..

Comment #2

Just to add to the confusion, "depth of focus" has been used interchangeably with "depth of field," and can be found used in that sense in some photography books. Even some cameras had depth of field scales marked as depth of focus scales..

"While the phrase depth of focus was historically used, and is sometimes still used, to mean depth of field, in modern times it is more often reserved for the image-side depth."http://en.wikipedia.org/wiki/Depth_of_focus..

Comment #3

Depth of Focus is INSIDE the camera, and describes the microscopic degree by which the image capture medium (film or sensor) can deviate from the precise plane focused on, and yet still yield a suitably sharp image..

Depth of Field is OUTSIDE the camera, and describes the much larger degree by which the subject distance can deviate from the plane focused on, and still yield a suitably sharp image..

The difference?? Easy.......

FIELDS are much too big to go *inside* cameras. Regards,Baz..

Comment #4

Sherwoodpete wrote:.

Eclipse Optics wrote:.

Although this image is in regards to television, the graph was thebest that I could find and does the best to explain Depth of Field &Depth of Focus..

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

From: http://www.usa.canon.com/html/industrial_bctv/ERC/calculator2.html.

Or to put it into words, "Depth of Focus" applies inside the camera -at the focal plane. It may have been more important in the use offilm cameras, where a slight curvature or variation from flatness inthe film could be accommodated within this very shallow zone.For most purposes we are usually much more interested in "Depth ofField" which is outside the camera, in the real world where theactual subject is..

Depth of focus is critical to AF systems as AF specs are really in terms of depth of focus. A Canon high precision AF means that the focus plane be within 1/3 of the depth of focus..

Leonhttp://homepage.mac.com/leonwittwer/landscapes.htm..

Comment #5

Barrie Davis wrote:.

Depth of Focus is INSIDE the camera..

Yes, that's one way the term is used, and it's most common use today. I just wanted to point out to the original poster that some authors and manufacturers, especially in times past, have used the term synonymously with depth of field. He will need to use the context of whatever source he's seeing the term in to discover the author's intended meaning...

Comment #6

Jrtrent wrote:.

Barrie Davis wrote:.

Depth of Focus is INSIDE the camera..

Yes, that's one way the term is used, and it's most common use today.I just wanted to point out to the original poster that some authorsand manufacturers, especially in times past, have used the termsynonymously with depth of field. He will need to use the context ofwhatever source he's seeing the term in to discover the author'sintended meaning..

Forgive me. No contradiction was intended. Sorry if I gave that impression...

(Hmmm... my comments should have been posted in reply to the original posting, instead of yours.)Regards,Baz..

Comment #7

The term Depth of Focus is not a new term and it was in use in the before the seventies. I suspect it's missuse also goes back that far. It does have real world implications as depth of focus is the wiggle room that allows sensor based IS to function...

Comment #8

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