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Arts & Design Exploring Folk Art by Michael Owen Jones
Arts & Design Monograms and Ciphers by Albert Angus Turbayne
Arts & Design Principles of Decorative Design
Arts & Design Caricature and Other Comic Art
Arts & Design Elements of Modern Painting
Arts & Design Famous European Artists by Sarah K. Bolton
Arts & Design China, 5000 Years: Innovation and Transformation in the Arts
Arts & Design Art of the Avant-garde in Russia
Arts & Design American Drawings by Lawrence Alloway
Arts & Design American Abstract Expressionists and Imagists
Arts & Design The Seven Periods of English Architecture
Arts & Design Art of the Avant-garde in Russia
Arts & Design A History of Architecture on the Comparative Method
Arts & Design The Great Painters' Gospel by Henry Turner Bailey
Arts & Design The Evolution Of Fashion by Florence Mary Gardiner
Arts & Design A History of Architecture on the Comparative Method
Arts & Design The Madonna in Art by Estelle M. Hurll
Arts & Design Michelangelo: A Collection of Fifteen Pictures, and a Portrait of the Master
Arts & Design The History of the Nineteenth Century in Caricature
Arts & Design Carving a Future for Belfast
Arts & Design Monograms and Ciphers by Albert Angus Turbayne
Arts & Design Principles of Decorative Design
Arts & Design Caricature and Other Comic Art
Arts & Design Elements of Modern Painting
Arts & Design Famous European Artists by Sarah K. Bolton
Arts & Design China, 5000 Years: Innovation and Transformation in the Arts
Arts & Design Art of the Avant-garde in Russia
Arts & Design American Drawings by Lawrence Alloway
Arts & Design American Abstract Expressionists and Imagists
Arts & Design The Seven Periods of English Architecture
Arts & Design Art of the Avant-garde in Russia
Arts & Design A History of Architecture on the Comparative Method
Arts & Design The Great Painters' Gospel by Henry Turner Bailey
Arts & Design The Evolution Of Fashion by Florence Mary Gardiner
Arts & Design A History of Architecture on the Comparative Method
Arts & Design The Madonna in Art by Estelle M. Hurll
Arts & Design Michelangelo: A Collection of Fifteen Pictures, and a Portrait of the Master
Arts & Design The History of the Nineteenth Century in Caricature
Arts & Design Carving a Future for Belfast
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Arts & Design The Ins and Outs of Focus by Harold Merklinger
Posted on 2010-03-15
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More The Ins and Outs of Focus by Harold Merklinger (Author) Mastery over the imaging process is the goal. Limitations due to diffraction, focal length, f-stop, curvature of the field and film curl are weighed agaisnt what is possible. The traditional depth of field theory, developed over a hundred years ago, deals with the ability of the image to portray detail. The usual standard is that the smallest detail need be no finer than the focal length of the camera lens (f) divided by 1500. (Most films are able to record detail about an order of magnitude finer.) The standard camera can focus precisely only at one subject distance, but if we accept the usual standard of acceptable sharpness, the lens is deemed to focus adequately well over a range of subject distances. That range of distances is called the depth of field. Applying this theory the way virtually all photography books suggest, Harold found he often obtained substandard images. He realized he was demanding a higher standard of resolution than f/1500, but when he adjusted the theory to reflect the resolution standard he was sometimes able to achieve, the depth of field would be vanishingly small and adequate focus ought to be just about impossible. This observation did not square with his observations either. Something seemed to be wrong with the theory. Applying a little high school algebra Harold realized that there was nothing wrong with the physical theory. The basic assumptions on which the theory is based are simply not appropriate for some photographic applications. If one asks a slightly different question, one obtains surprisingly different answers. If one asks "What do I need to do to resolve objects a quarter-inch in diameter at any subject distance?", the answer is to use a lens aperture smaller than one-quarter of an inch and focus at infinity! Of course diffraction limits resolution if the lens aperture is too small. What's too small? Should I ever focus at the hyperfocal distance? Should I always focus at infinity? What's the best aperture to use? These are some of the questions The INs and OUTs of FOCUS is intended to answer. or Thank you! Thanks...?????????? Thanks, really appreciated this post!!! ???????????????? ...Thanks
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