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Depth of Field The zone of acceptable sharpness is referred to as the depth of field. Thus, increasing the depth of field increases the sharpness of an image. This is, of course, because of insufficient depth of field. www.cs.mtu.edu /~shene/DigiCam/User-Guide/950/depth-of-field.html   (935 words)

Nikon MicroscopyU: Concepts and Formulas in Microscopy: Depth of Field/Focus Depth of focus varies with numerical aperture and magnification of the objective, and under some conditions, high numerical aperture systems (usually with higher magnification power) have deeper focus depths than do those systems of low numerical aperture, even though the depth of field is less (see Table 1). Notice that the diffraction-limited depth of field (the first term in the equation) shrinks inversely with the square of the numerical aperture, while the lateral limit of resolution is reduced in a manner that is inversely proportional to the first power of the numerical aperture. These values for the depth of field, and the distribution of intensities in the three-dimensional diffraction pattern, are calculated for incoherently illuminated (or emitting) point sources where the numerical aperture of the condenser is greater than or equal to that of the objective. www.microscopyu.com /articles/formulas/formulasfielddepth.html   (1022 words)

Understanding Depth of Field in Photography Depth of field is the range of distance around the focal plane which is acceptably sharp. Depth of field calculations ordinarily assume that a feature size of 0.01 inches is required for acceptable sharpness (as discussed earlier), however people with 20-20 vision can see features 1/3 this size. A greater depth of field is achieved (than would be ordinarily calculated) for a pupil magnification less than one, whereas the pupil magnification does not change the calculation when it is equal to one. www.cambridgeincolour.com /tutorials/depth-of-field.htm   (1571 words)

Depth of Field - - PopPhotoAugust 2001 And when you enlarge your picture, depth of field decreases rapidly; the greater the degree of enlargement, the less depth of field. Landscapes have great depth of field, while macro photographs tend to have virtually no depth of field because the subject is so close to the lens. Depth of field decreases with increasing focal length (given equal subject distance). www.popphoto.com /howto/450/depth-of-field.html?print_page=y   (1190 words)

Digital Depth of Field Article The depth of field that you will achieve with a photograph depends on several things, in particular, the f-stop, the focal length of the lens and how close you are to the subject. I found that depth of field is proportional to the ratio of f-stop to focal length. Interestingly, depth of field also becomes important in scenic photography, because a good scenic usually has some object in the foreground which should be in focus in order to emphasize depth to the image. www.svca.org /articles/DigitalDepthofField.htm   (1144 words)

Depth of Field: Optical: Glossary: Learn: Digital Photography Review Depth of field (DOF) is a term which refers to the areas of the photograph both in front and behind the main focus point which remain "sharp" (in focus). Depth of field is affected by the aperture, subject distance, focal length, and film or sensor format. This depth of field calculator allows you to have a better understanding of the various factors that affect depth of field. www.dpreview.com /learn/?/Glossary/Optical/Depth_of_Field_01.htm   (295 words)

Depth Of Field Generator PRO - Information Depth of Field Generator PRO is the result of ongoing research, development and programming collaboration between Richard Rosenman and Martin Vicanek in an effort to produce a Photoshop® compliant plugin capable of delivering high quality, sophisticated Depth of Field and Bokeh effects quickly and efficiently as a post process. Depth Of field (DOF) is the amount of distance between the nearest and furthest objects that appear in acceptably sharp focus as seen by a camera lens. Depth of field is heavily used in photography, film and computer graphics as a creative element, in typical examples ranging from portraiture to macro photography. www.dofpro.com /info.htm   (2119 words)

Depth of field, what is depth of field or depth of focus Depth of field is related to focal length of the lens used and the aperture. Depth of field varies constantly across the focussing range of the lens too, its depth of field at 3ft will be measured in inches whilst at 30ft it will be many feet either side. If the depth of field is too small, use a smaller aperture (and double the exposure time for each stop you go down) until you get what you are after, or vice versa if you wish to go the other way. licm.org.uk /livingImage/depth_of_field.html   (402 words)

Depth of field Depth of field is defined as the range of object distances within which objects are imaged with acceptable sharpness. The rear DOF rapidly increases with the object distance and at an object distance known as the hyperfocal distance it becomes infinite. Depth of field is small in the world of macro photography and although the subjects are small too, it is often difficult to attain sufficient DOF. www.vanwalree.com /optics/dof.html   (6313 words)

Computations of stereoscopic base and depth of field The depth of field of a digital camera with a lens of the 1:N focal length equivalence ratio at a given F-setting is the same as that of a 35 mm camera with a lens closed down to the aperture number of F multiplied by N." The remarkable increase in depth of field obtained from a small format camera at macro distances was a shock to me and means I may return to the Nikon 4500 for macro work, even though it is a pain to use compared with the Canon. This means depth of field is proportional to the square of the pixel size and inversely proportional to the square of the magnification. nzphoto.tripod.com /stereo/3dtake/fdof.htm   (3920 words)

Photo Technique #007 @Digital Outback Photo When depth of field is described, it is in relation to a circle of confusion, the smallest dot that is considered "sharp". Depth of field is not a fixed property of aperture and focal length. Conventional depth of field tables generally use a "circle of confusion" of 20-30 microns (The circle of confusion or COC is the smallest dot that the lens can resolve at any given aperture). www.outbackphoto.com /workshop/phototechnique/essay07/essay.html   (1237 words)

Nikon MicroscopyU: Concepts and Formulas in Microscopy One set consists of four field planes and is referred to as the field or image-forming conjugate set, while the other consists of four aperture planes and is referred to as the illumination conjugate set. Depth of Field and Depth of Focus - The depth of field is the thickness of the specimen that is acceptably sharp at a given focus level. Field of View - The diameter of the field in an optical microscope is expressed by the field-of-view number, or simply the field number, which is the diameter of the view field in millimeters measured in the intermediate image plane. www.microscopyu.com /articles/formulas/formulasindex.html   (1158 words)

DOF The term "Depth of Field" describes the range in a photograph, from near to far, that appears to be in focus. If you look at a DOF table, the DOF scale on a lens, or use a computer program to make the calculation, you'll see that one of the laws of optics is that the DOF extends from 1/3rd in front of the point focused on, to 2/3rds behind it. DOF doesn't care about the recording media type or size, though a lower COF is used for medium and large format, since the amount of magnification to make a decent sized print is much less than for 35mm. www.luminous-landscape.com /tutorials/understanding-series/dof.shtml   (2006 words)

Depth of Field Discussion Depth of Field (DOF) refers to the distance from the nearest to the furthest point of perceived "sharp" focus in a picture. Depth of field in macro or close up situations is the same for any given magnification (size of image on film/ object size). In macro/close-up photography, depth of field extends 1/2 in front and 1/2 behind the focus point (not 1/3, 2/3 as is commonly stated as a general rule of thumb). abetterphotoguide.bizhosting.com /depth_of_field_info.html   (1474 words)

depth-of-field explanation "Depth of field", also known as "depth of focus" is how much distance, in front of and behind the spot on which you actually focus, is still in focus. Depth of Field as a Function of Distance Ratios Camera manufacturers and many discussions about depth of field would have you believe that there is an absolute numeric fact about what's in focus and what's not. www.aesthetic-endeavors.com /photo/dof   (1634 words)

Depth of Field Calculator Depth of field (DOF) is the range of distances in an image over which the image is said to be "sharp". A critical concept in DOF is the diameter of the circle of confusion (CoC). DOF is at best a "fuzzy" concept, depending on subjective judgement of what appears to be sharp. www.bobatkins.com /photography/technical/dofcalc.html   (1073 words)

Depth of field and diffraction Depth of field is constant when the f-stop is proportional to the format size, i.e., DOF is the same for a 35mm image taken at f/11, a 6x7 image at f/22, a 4x5 image at f/45 or an 8x10 image at f/90. When large depth of field is needed, lenses usually have to be stopped down beyond their optimum aperture, especially for large formats, where very small apertures are required. If large DOF was required, it was obtained by using the camera's movements, particularly the tilt, which allows the plane of focus to be altered (via the Scheimpflug effect). www.normankoren.com /Tutorials/MTF6.html   (4866 words)

CameraHobby - e-Book on Depth of Field, Chapter 18 DOF is comprised of two parts, the zone in front of your subject focus and the zone behind your subject focus. DOF is so important that experience has revealed to me that the majority of photographers choose to shoot in Aperture Priority mode with their cameras. The relation to depth of field is that if you are concerned about the COC then it is likely that you are trying to maximize your zone of sharpness in a landscape scene, from very close up to infinity for the purposes of large print sizes. www.camerahobby.com /EBook-DepthField_Chapter18.htm   (2065 words)

Depth of Field Depth of field is the amount of distance between the nearest and farthest objects that appear in acceptably sharp focus in a photograph. Landscapes have great depth of field, while macro photographs tend to have very little depth of field because the subject is so close to the lens. In a scenario like low light where you need to to shot wide open and wish to have extended depth of field or cases where you are force to live with a fixed-aperture mirror lens, if you suspect that the aperture is too wide to deliver adequate depth of field, simply move back. www.mir.com.my /rb/photography/fototech/htmls/depth.html   (1680 words)

Photography: Depth of Field Depth of field is (loosely quoting from an old professor of mine) “that area both in front of and behind the plane of sharp focus where objects appear in reasonable focus”;. The factors affecting depth of field are aperture setting, distance from the subject, and focal length of the lens. Shallow depth of field: a combination of wide aperture and short distance to subject. finearts.fontbonne.edu /tech/photo/film/dof.html   (457 words)

JimDoty.com - Depth of Field DOF is a function of how much those points of light are magnified or enlarged when the circles of confusion on film (or the digital sensor) are enlarged on the final print. One very handy way to achieve a lot of depth of field for landscape photos, even if your camera does not have a depth of field preview button, is to use the hyperfocal distance for the lens and aperture in use. The distance opposite the focus mark (not the depth of field marks) is the hyperfocal distance for that lens at that aperture. jimdoty.com /Tips/Depth_of_Field/depth_of_field.html   (1893 words)

Depth of Field Their use in "Depth of Field" is not intended to infringe on the Stikfas intellectual property. The stories presented in "Depth of Field" and "Experimental Strip" are works of fiction and any similarity between the characters and real persons (living or dead) is purely coincidental. Depth of Field is written and photographed by Lauren Tozer-Kilts. www.depth-of-field-comic.com   (363 words)

Depth of Field Depth of field scales engraved on lenses assume some chosen enlargement factor, for example an 8 x 10 print viewed from 10 inches for 35mm cameras, and 4x5 prints for a Minox. The following tables can be used to assess the depth of field for critical work in which the potential print size is to be greater than the nominal 4 x 5 range for which the depth of field scale on the Minox is calibrated. The depth of field figures indicate that with one of each, no focusing would be necessary from 4.6 feet. www.minoxlab.com /Don_Krehbiel/mpl/dkdof.htm   (1380 words)

Paul Janosi"Depth of field"   (Site not responding. Last check: 2007-11-06) Since at 1:1 reproduction ratio the depth of field at f22 is only about 1/4 inch, at 1:2, 1/2 inch, at 1:3, 3/4 inch and at 1:4, about 1 inch, it is clear that a small aperture and careful placement of the subject, if it has depth, will be necessary. Depth of field can be controlled by the aperture size, focal length and lens to subject distance. The closer you are to the subject the grater the magnification the shallower the depth of field. www.uimage.com /photography/depth_of_field.html   (352 words)

[Ganoksin] Jewelry Making - Jewelry Photography, Depth of Field Notes Depth of field refers to the amount of the object that is in focus (the depth that is in focus). The smaller an object, and the closer you are to it, the less depth of field you have available, so that, for instance, in microscopy, where they're taking pictures of bacteria and really tiny objects on a glass slide, their depth of field is almost non - existent; it's a single plane. I might set the camera on f-8 or f-4, and reduce my depth of field so that only the flat plane of the object was in focus, making the visible parts of the stand go strongly out of focus and thus blend in with the background. www.ganoksin.com /borisat/nenam/depth_of_field.htm   (1729 words)

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