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The important thing in terms of design communication is that the genre shapes the style and expectation. ... At one level, these are simply the well-understood photography genres, such as portrait, landscape, wedding and so on. However, within each of these genres, we see developed styles and subgenres.

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A 35mm format — just called 35mm — describes a common type of image sensor format that's used in film photography. The general rule is, the larger the film, the better the resolution. Smaller formats like 35mm will be noticeably grainier when printed — but that's often a much-loved result of film photography.

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in a twin-lens reflex camera, the finder has a lens of its own, essentially a duplicate of the aperture lens, placed above it and reflecting the image by a mirror to a ground-glass screen. The image is not inverted but is laterally reversed.

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a darkened box with a convex lens or aperture for projecting the image of an external object onto a screen inside. It is important historically in the development of photography.

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The gelatin silver print or gelatin developing out paper (DOP) is a monochrome imaging process based on the light sensitivity of silver halides. ... The image is then made permanent by treatment in a photographic fixer, which removes the remaining light sensitive silver halides.