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.Photo Tips
Having no finite focal point or infinitely distant - a lens or an optical system with zero focal power.
An astrophotography term used when photographs are taken by attaching a camera to a telescope’s eyepiece.
lens attachment that alters the focal length of the camera lens without disturbing the distance between the lens and the film plane.