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The T-mount is a standard lens mount for cameras and other optical assemblies. The usual T-mount is a screw mount using a male 42×0.75 (42 mm diameter, 0.75 mm thread pitch) metric thread on the lens with a flange focal distance of 55 mm and a mating female 42mm thread on a camera adapter or other optical component.
To use a telescope as a camera lens requires an adapter for the standard 1.25 inch tube eyepiece mount, usually a T-mount adapter, which in turn attaches to an adapter for the system camera's particular lens mount. Controlling exposure is done by exposure time, gain, or filters since telescopes almost always lack diaphragms for aperture adjustment.
Digiscoping is a neologism for afocal photography, using a camera to record distant images through the eyepiece of an optical telescope. Digiscoping usually refers to using either a digital single-lens reflex camera with lens attached or, more often, a fixed lens point and shoot digital camera to obtain photos through the eyepiece of a ...
L1 - Telescope objective L2 - Eyepiece L3 - Camera lens. Afocal photography, also called afocal imaging or afocal projection is a method of photography where the camera with its lens attached is mounted over the eyepiece of another image forming system such as an optical telescope or optical microscope, with the camera lens taking the place of ...
A teleside converter lens attached in front of a camera. 2 - Camera lens 1 - Teleside converter. A teleside converter [1] (also known as a telephoto conversion lens or a front mount teleconverter) [2] is a secondary lens which is mounted on the front of a photographic lens to increase the effective focal length of the lens they are attached to.
For a refractor telescope or simple camera lens, the new effective focal length f n is given by: [2] [3] = (), where f o = original focal length of telescope, d = distance from telecompressor to image plane, and f r = focal length of telecompressor.