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Genre is any form or type of communication in any mode with socially-agreed-upon conventions developed over time. In popular usage, it normally describes a category of literature, music, or other forms of art or entertainment, whether written or spoken, audio or visual, based on some set of stylistic criteria.

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The gelatin silver process is the most commonly used chemical process in black-and-white photography, and is the fundamental chemical process for modern analog color photography. As such, films and printing papers available for analog photography rarely rely on any other chemical process to record an image.

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A twin-lens reflex camera is a type of camera with two objective lenses of the same focal length. One of the lenses is the photographic objective or "taking lens", while the other is used for the viewfinder system, which is usually viewed from above at waist level.

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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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A camera obscura is a darkened room with a small hole or lens at one side through which an image is projected onto a wall or table opposite the hole. Camera obscura can also refer to analogous constructions such as a box or tent in which an exterior image is projected inside.