A selection of common terms and acronyms



This is not an exhaustive glossary but a selection of terms that may not have had extensive explanation in the main text.

AAVSO: American association of variable star observers.

Achromat: A refractor made of objective lenses of different materials to bring two colors of light to almost the same focal point.

Adobe RGB (1998): A popular color space (profile) for photographers and image editing.

ADU: Refers to Analog to Digital Units, the digital pixel values from a CCD.

Afocal Projection: In astrophotographic terms a telescope, complete with eyepiece, is coupled to a camera (with its lens) to image onto the sensor. The camera lens is in effect replacing the human eye in a visual setup. The ...

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