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2. Afocal photography - Wikipedia

   en.wikipedia.org/wiki/Afocal_photography

   Afocal photography works with any system that can produce a virtual image of parallel light, for example telescopes and microscopes. Afocal photographic setups work because the imaging device's eyepiece produces collimated light and with the camera's lens focused at infinity, creating an afocal system with no net convergence or divergence in the light path between the two devices. [2]

3. Questar Corporation - Wikipedia

   en.wikipedia.org/wiki/Questar_Corporation

   Braymer designed a built-in “Control Box” that allowed the user, looking through the main eyepiece, to switch between the main telescope and a coaxial finderscope via moving a diagonal out of the way with a flick of a knob. This also allowed a camera or other device to access the focal plane through a hole on the back of the Control Box.

4. List of telescope parts and construction - Wikipedia

   en.wikipedia.org/wiki/List_of_telescope_parts...

   Focuser: Allows the user to adjust the focus by moving the eyepiece along the optical axis. Eyepiece : Performs the final focus correction before the light reaches the eye. Charge-coupled device (CCD) : A light-sensitive integrated circuit digital sensor (commonly used in digital cameras) that turns light into an electrical charge used to ...

5. Astrophotography - Wikipedia

   en.wikipedia.org/wiki/Astrophotography

   Positive projection – A method in which the telescope eyepiece (eyepiece projection) or a positive lens (placed after the focal plane of the telescope objective) is used to project a much more magnified image directly onto the film or CCD. Since the image is magnified with a narrow field of view this method is generally used for lunar and ...

6. Wide Field Camera 3 - Wikipedia

   en.wikipedia.org/wiki/Wide_Field_Camera_3

   The Wide Field Camera 3 (WFC3) is the Hubble Space Telescope's last and most technologically advanced instrument to take images in the visible spectrum. It was installed as a replacement for the Wide Field and Planetary Camera 2 during the first spacewalk of Space Shuttle mission STS-125 (Hubble Space Telescope Servicing Mission 4) on May 14, 2009.

7. Relay lens - Wikipedia

   en.wikipedia.org/wiki/Relay_lens

   In optics, a relay lens is a lens or a group of lenses that receives the image from the objective lens and relays it to the eyepiece. Relay lenses are found in refracting telescopes , endoscopes , and periscopes to optically manipulate the light path , extend the length of the whole optical system , and usually serve the purpose of inverting ...