De Vere Enlarger Manual Arts
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Contents • • • • • • • • • • • • Construction [ ] All enlargers consist of a light source, normally an, a or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection. The light passes through a holder, which holds the exposed and photographic negative or transparency. Prints made with an enlarger are called enlargements. Typically, enlargers are used in a, an enclosed space from which extraneous light may be excluded; some commercial enlargers have an integral dark box so that they can be used in a light-filled room. Types of enlarger [ ].
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Photographic Enlarger. A condenser enlarger consists of a light source, a condensing, a holder for the negative and a projecting lens. The condenser provides even illumination to the negative beneath it. A diffuser enlarger's light source is by translucent glass or plastic, providing even illumination for the film. Condenser enlargers produce higher than diffusers because light is scattered from its path by the negative's image silver; this is called the. The condenser's increased contrast emphasises any negative defects, such as dirt and scratches, and image grain.
Diffuser enlargers produce an image of the same contrast as a contact print from the negative. Dedicated color enlargers typically contain an adjustable filter mechanism - the - between the light source and the negative, enabling the user to adjust the amount of red, green and blue light reaching the negative to control. Other models have a drawer where cut filters can be inserted into the light path, synthesize colour by of light from colored lamps with adjustable intensity or duty cycle, or expose the receiving medium sequentially using red, green and blue light.
These enlargers can also be used with variable-contrast monochrome papers. Digital enlargers project an image from an LCD screen at the, to produce a photographic enlargement from a digital file. Enlarger physical arrangements [ ] Most modern enlargers are vertically mounted with the head pointing downward and adjusted up or down to change the size of the image projected onto the enlarger's base, or a work table if the unit is mounted to the wall. A horizontal enlarger consists of a trestle, with the head mounted on crossbars between two or more posts for extra stability. A horizontal enlarger structure is used when high quality, enlargements are required such as when photographs are taken from aircraft for mapping and taxation purposes. [ ] The parts of the enlarger include baseboard, enlarger head, elevation knob, filter holder, negative carrier, glass plate, focus knob, girder scale, timer, bellows, and housing lift. Principles of operation [ ].
Enlarger lens: using the diaphragm - aperture ring the photographer adjusts the iris. The image from the negative or transparency is projected through a lens fitted with an adjustable iris, onto to a flat surface bearing the sensitized. By adjusting the ratio of distance from film to lens to the distance from lens to paper, various degrees of enlargement may be obtained, with the physical enlargement ratio limited only by the structure of the enlarger and the size of the paper. As the image size is changed it is also necessary to change the focus of the lens. Some enlargers, such as 'Autofocus' enlargers, perform this automatically. An is used to hold the paper perfectly flat.
Some easels are designed with adjustable overlapping flat steel 'blades' to crop the image on the paper to the desired size while keeping an unexposed white border about the image. Black Sabbath Rapidshare Discography. Paper is sometimes placed directly on the table or enlarger base, and held down flat with metal strips. Aoki Ookami To Shiroki Mejika Iv Genghis Khan Rarity. The enlargement is made by first focusing the image with the lamp on, the lens at maximum aperture and the easel empty, usually with the aid of a. The lamp is turned off, or in some cases, shuttered by a light-tight mechanism. The image is focused by changing the distance between the lens and the film, achieved by adjusting the length of a light-tight bellows with a geared mechanism. Electric timer: photographers choose exposure time.
The lens is set to its working aperture. Enlarging lenses have an optimum range of apertures which yield a sharp image from corner to corner, which is 3 f/ stops smaller than the maximum aperture of the lens. For an enlarging lens with a maximum aperture of f/2.8, the optimal aperture would be f/8.
The lens is normally set to this aperture and any color filtration dialed in, if making a color print or one on variable-contrast black-and-white paper. The enlarger's lamp or shutter mechanism is controlled either by an electronic timer, or by the operator - who marks time with a clock, metronome or simply by counting seconds - shuttering or turning off the lamp when the exposure is complete. The exposed paper can be processed immediately or placed in a light-tight container for later processing. Digitally controlled commercial enlargers typically adjust exposure in steps known as; twelve printer points makes a factor of two change in exposure. Paper processing [ ] After exposure, photographic paper is developed, fixed, washed and dried using the.
Automated print machines [ ] Automated photo print machines have the same basic elements and integrate each of the steps outlined above in a single complex machine under operator and control. Rather than project directly from the film negative to the print paper, a digital image may first be captured from the negative. This allows the operator or computer to quickly determine adjustments to brightness, contrast, clipping, and other characteristics. The image is then rendered by passing light through the negative and a built-in computer-controlled enlarger optically projects this image to the paper for final exposure.
As a byproduct of the process a recording may be made of the digital images, although a subsequent print made from these may be quite inferior to an image made from the negative due to digitization noise and lack of dynamic range which are characteristics of the digitizing process. For better images, the negatives may be reprinted using the same automated machine under operator selection of the print to be made. Advantages [ ] • The image may be printed to a size different from the negative or transparency. Without an enlarger, only a would be possible, and large images would require large size negatives and hence very large cameras. • Local contrast and density of various parts of the print can be easily controlled. Changing the amount of light exposing the paper in various areas will change the image density in those areas.
A mask with a hole can be used to add extra light to an area, which will have the effect of darkening the regions with additional exposure, while the use of a small wand to reduce the total exposure to a region is called ' and has the effect of lightening the regions with reduced exposure. The tool is kept moving to avoid producing a sharp edge at the region boundary. Using these techniques it is possible to make significant changes to the mood or emphasis of a photographic print. Similar methods are available with contact printing, but it is more difficult to see the image as it is being manipulated. • It is also possible to make composite photographs by overlaying the print with a hand-cut mask, performing an exposure, and then using the inverse of that mask to perform another exposure with a different negative. This is much more difficult to do well using photographic methods than it is now by using the methods of modern.
Image enlargement limits [ ]. Adjusting elevation knob: change in image size. The practical amount of enlargement (irrespective of the enlarger structure) will depend upon the grain size of the negative, the sharpness (accuracy) of both the camera and projector lenses, blur in the image due to subject motion and camera shake during the exposure, and the intended viewing distance of the final product. For example, a 5 by 7 inch print intended for viewing in a at 18 inches may be unsuitable for enlargement as an 8 by 10 inch print to be hung on a hallway wall to be viewed at the same distance, but usable at a larger 5 by 7 feet (twelve times larger) on a to be viewed no closer than eighteen feet (twelve times more distant). Manufacturers [ ] As the photographic market shifts away from film-based towards electronic imaging technology, many manufacturers no longer make enlargers for the professional photographer., who made high quality enlargers, stopped producing them in 2005, but still supports already sold models. Manufacturers old and new include: • • • • • • • • • • • • • • • • • Lucky (now owned by Kenko) • • • Ōmiya Shashin-yōhin K.K.