Afocal

EN: Afocal lens

Fotografie

lens attachment that alters the focal length of the camera lens without disturbing the distance between the lens and the film plane.
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Afocal

Having no finite focal point or infinitely distant - a lens or an optical system with zero focal power.

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Afocal photography

Occurs when aiming a camera’s lens, focused on infinity, into a telescope’s eyepiece when the telescope is also focused on infinity. The image is effectively transmitted as parallel light rays, and does not need to be brought into focus.

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Afocal projection

An astrophotography term used when photographs are taken by attaching a camera to a telescope’s eyepiece.

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