Depth of focus

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.

Depth of focus
The distance the film or printing paper can be positioned either side of the focus point and still maintain acceptably sharp results.
Search SWPP and BPPA
Information provided by: SWPP BPPA
More Photographic Terms ...

Depth of Focus
Depth of Focus measures the displacement of film within a camera. Also known as "lens-to-film tolerance", depth of focus is measured microscopically (in thousandths of an inch, for example).

Depth of focus
Techniques Glossary Depth of focus
The distance the film or printing paper can be positioned either side of the focus point and still maintain acceptably sharp results.

Depth of focus
Depth of focus refers to the zone in front of and behind the focal plane in which the blurred image point is smaller than the acceptable circle of confusion.

Depth of Focus The distance range over which the film could be shifted at the film plane inside the camera and still have the subject appear in sharp focus; often misused to mean depth of field.

Depth of focus
Very narrow zone on the image side of the lens within which slight variations in the position of the film will make no appreciable difference to the focusing of the image.

DEPTH OF FOCUS - A zone of focus in the camera. If an image is focused on a ground glass screen in a camera, depth of focus makes it possible to move the screen slightly backward or forward and still have the image in acceptable focus.

DEPTH OF FOCUS & APERTURE VISUALIZATION
Another implication of the circle of confusion is the concept of depth of focus (also called the "focus spread").

depth of focus
the distance that a lens can be moved toward or away from subject or copy when focused, without throwing the subject or copy out of focus.

Depth of focus. The range that the image-capturing surface (such as a sensor or film) could be moved while maintaining acceptable focus. See also depth of field.

-Depth of focus - distance which the film plane can be moved while maintaining an acceptably sharp image without refocusing the lens.

Generally, depth of focus extends twice as far behind the point of focus as it does in front of it.

Depth of focus The focal length of a lens system to maintain a precise image size. Dew Heater An electric strap that wraps around the front of a telescope and heats up when plugged in to a power supply.

Depth of focus 4. Hyperfocal distance 1-55. What term describes the distance from the lens beyond which all objects are rendered in acceptably sharp focus when the lens is set at infinity? 1. Hyperfocal distance 2. Depth of field 3. Depth of focus 4.

The reason is Depth of Field; call it Depth of Focus for simplicity. As you turn the aperture ring you alter the amount of light, and the Depth of Focus. What is Depth of Focus?

A very shallow depth of focus would help immensely. The flash has resulted in a very flat appearance, which is exacerbated greatly with the lack of tonal contrast between the background and the model's hair & eye color.

Depth of focus: The distance the film plane can be moved from a point of focus while still producing an acceptably sharp image.
Developer: Chemical bath that produces a visible image of metallic silver from image formed on film or print.

A longer focal length gives a shallower APPARENT depth of focus. In other words because of the compression effects, it magnifies the portions that are out of focus, thus creating the illusion of a shallower depth of focus.

There are two basic approaches I use in shooting architectural or landscape architectural images when it comes to limited depth of field (or depth of focus, if you prefer).

Depth of field varies according to focal length of the lens, chosen aperture and shooting distance. Depth of Focus A measurement of the distance behind the lens wherein the film plane will remain sharply in focus.

Add to this the extreme shallow depth of field possible with fast lenses, and photographers even on the tightest budget can start experimenting with depth of focus techniques, ...

If you have an athlete in the house, a larger depth of focus will insure that the greatest area of the playing field is in focus. This is important, because the action moves so quickly across the field at any given time.

The focus spread is sometimes refered to as depth of focus, the acceptable distance between imaging planes for a given circle of confusion and f-stop D = 2cN.

Rating: 9 / 10
A good way to highlight the important details of your images is to utilize depth of focus. Here are some basic tips from Russ Burden to help you control which elements of your images are sharp and which become secondary.

Auto-Focus works fine, and the depth of focus is extremely deep. With manual focus you can focus to just before infinity, and everything will be in focus.

The aperture not only influences picture brightness but also regulates depth of focus. Most cameras are equipped with an iris aperture that can be freely adjusted or set according to pre-selected values.

However, if you want ultra-sharp images of far-away landscapes, you will want high numbered f-stops which will produce clearer images with greater depth of focus ("depth of field"); ...

The JavaScript program will calculate the near point in focus, far point in focus, depth of focus and hyperfocal distance. The default unit of measure for distance is feet. This can be overridden by selecting meters.

The area in front of and behind the plane of focus in the scene which is acceptably sharp (for intended enlargement). Tip: a little more depth requires a lot more light (for smaller Stop) or a wider-angle lens. Don't call it depth of focus, ...

Try moving to one side slightly or reduce the depth of focus to fade out undesirable elements in the background. Do not try to accommodate as much as possible in your picture. Less is more! Separate the important from insignificant.

This area can be in the background or foreground but is usually noticed in the background. This "bokeh" is actually a term used to try to explain the areas in an image that is not in focus do to the limits of the depth of focus.

The greater the distance between your subject and the background, the more likely it will be beyond the depth of focus, and begin to blur.

the viewfinder from side to side without exceeding the lens's minimum focus distance. Most viewfinders will still give some empty space around the frame even when it is filled. But remember, never work nearer than the lens's minimum depth of focus.

See also: Depth of, Focus, Camera, Image, Photograph