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  2. List of telescope parts and construction - Wikipedia

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

    Optics. Mirrors and lenses are the critical light-bending components of a telescope. Objective: The first lens or curved mirror that collects and focuses the incoming light. Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before ...

  3. Telephoto lens - Wikipedia

    en.wikipedia.org/wiki/Telephoto_lens

    A telephoto lens, also known as telelens, is a specific type of a long-focus lens used in photography and cinematography, in which the physical length of the lens is shorter than the focal length. [1] : 93 This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus lens in ...

  4. Single-lens reflex camera - Wikipedia

    en.wikipedia.org/wiki/Single-lens_reflex_camera

    A single-lens reflex camera ( SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured. With twin lens reflex and rangefinder cameras, the viewed image could be significantly different from the final ...

  5. Aerial photography - Wikipedia

    en.wikipedia.org/wiki/Aerial_photography

    Aerial photography. An aerial photograph using a drone of Westerheversand Lighthouse, Germany. An aerial view of the city of Pori, Finland. Air photo of a military target used to evaluate the effect of bombing. Aerial photography (or airborne imagery) is the taking of photographs from an aircraft or other airborne platforms. [ 1]

  6. Manual small incision cataract surgery - Wikipedia

    en.wikipedia.org/wiki/Manual_small_incision...

    Manual small incision cataract surgery. Manual small incision cataract surgery (MSICS) is an evolution of extracapsular cataract extraction (ECCE); the lens is removed from the eye through a self-sealing scleral tunnel wound. A well-constructed scleral tunnel is held closed by internal pressure, is watertight, and does not require suturing.

  7. List of instruments used in ophthalmology - Wikipedia

    en.wikipedia.org/wiki/List_of_instruments_used...

    Contact lenses. to correct refractive errors of the eye; a little invasive. Phoropter. used in refraction testing. Tonometers. used to determine the intraoccular pressure (IOP) - useful in glaucoma; video link for various types of tonometers. Speculum: to keep the eyes open during any operation. Universal eye speculum.

  8. Manual focus - Wikipedia

    en.wikipedia.org/wiki/Manual_focus

    Manual focus. In the field of photography, a manual focus camera is one in which the user has to adjust the focus of the lens by hand. Before the advent of autofocus, all cameras had manually adjusted focusing; thus, the term is a retronym . The focus itself may be adjusted in a variety of ways. Larger view cameras and the like slide the lens ...

  9. Ray J - Wikipedia

    en.wikipedia.org/wiki/Ray_J

    Sanctuary. Atlantic. Elektra. EastWest. Musical artist. Website. rayj .com. William Ray Norwood Jr. (born January 17, 1981), [1] known professionally as Ray J, is an American R&B singer, songwriter, television presenter, and actor. Born in McComb, Mississippi and raised in Carson, California, he is the younger brother of singer and actress Brandy.