Glossary of Digital Photography Terms: Definitions

Single-lens reflex (SLR) – is a type of camera that uses a movable mirror placed between the lens to show the image that will be captured in a viewfinder. Digital single-lens reflex camera (digital SLR or DSLR) – is a digital camera that operates on the same optical and mechanical principles as a film single-lens reflex camera. Exposure compensation – is a technique to compensate a measured exposure level against other factors which may render a less-optimal image (filters, non-standard processing, or intended under or overexposure). Focal length – is a measure of how strongly it focuses or diverges light. Telephoto lens – is a specific construction of a long focal length photographic lens that places its optical centre outside of its physical construction, such that the entire lens assembly is between the optical centre and the focal plane. Wide-angle lens – is a lens whose focal length is substantially … Read more

Glossary of Digital Photography Terms: Definitions

Aperture of the lens – adjustment of the “iris”, which controls the amount of light entering the lens. Auto-focus – the selection of a point in the imaging frame upon which the auto-focus system will attempt to focus. Depth of field (DOF) – is the distance in front of and beyond the subject that appears to be in focus. Film speed – is the measure of a photographic film’s sensitivity to light. Image noise or Film grain – is a random, usually unwanted, fluctuation of pixel values in an image. ISO – on film cameras it’s an indicator of the selected film speed on film cameras, on digital cameras it’s an indication of the imaging chip’s light sensitivity. Motion blur – is the apparen’t streaking of rapidly moving objects in a still image. Shutter speed – adjustment of the speed of the shutter to control the amount of time during … Read more

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