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  2. Stereoscopic rangefinder - Wikipedia

    en.wikipedia.org/wiki/Stereoscopic_rangefinder

    A stereoscopic rangefinder or stereoscopic telemeter [1] is an optical device that measures distance from the observer to a target, using the observer's capability of binocular vision. It looks similar to a coincidence rangefinder, which uses different principles and has only one eyepiece. German instruments tended to use the stereoscopic ...

  3. Petri Camera - Wikipedia

    en.wikipedia.org/wiki/Petri_Camera

    They returned to the M42 mount in 1974 with the Petri FTX body, [2] continuing to use it on low cost bodies such as the FT1000/500 and the compact MFT1000 and Micro MF-1 bodies. For the pictured Petri 7 1.8 the company offered a kit that included a front adapter lens marked AUX TELEPHOTO which screws onto the primary lens; a similar lens for ...

  4. M39 lens mount - Wikipedia

    en.wikipedia.org/wiki/M39_lens_mount

    The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...

  5. Leupold & Stevens - Wikipedia

    en.wikipedia.org/wiki/Leupold_&_Stevens

    Leupold & Stevens, Inc. is an American manufacturer of telescopic sights, red dot sights, binoculars, rangefinders, spotting scopes, and eyewear located in Beaverton, Oregon, United States. The company, started in 1907, is on its fifth generation of family ownership. [2] [3]

  6. Coincidence rangefinder - Wikipedia

    en.wikipedia.org/wiki/Coincidence_rangefinder

    Eyepiece image of a naval rangefinder, showing the displaced image when not yet adjusted for range. The coincidence rangefinder uses a single eyepiece. Light from the target enters the rangefinder through two windows located at either end of the instrument. At either side the incident beam is reflected to the center of the optical bar by a ...

  7. Rangefinder camera - Wikipedia

    en.wikipedia.org/wiki/Rangefinder_camera

    Rangefinder Camera Mechanism. Some cameras do not have a beam splitter; these cameras instead have a separate viewfinder.The first rangefinders, sometimes called "telemeters", appeared in the twentieth century; the first rangefinder camera to be marketed was the 3A Kodak Autographic Special of 1916; the rangefinder was coupled.

  8. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    Binoculars with high magnification and heavy weight usually require some sort of mount to stabilize the image. A magnification of 10x is generally considered the practical limit for observation with handheld binoculars. Binoculars more powerful than 15×70 require support of some type.

  9. Ranger Rick - Wikipedia

    en.wikipedia.org/wiki/Ranger_Rick

    Ranger Rick, originally Ranger Rick's Nature Magazine, [1] is a children's nature magazine that is published by the United States National Wildlife Federation (NWF). [2] The magazine offers feature articles and activities for children ages eight and up to spark their interest in the outdoors and encourage them to become more actively involved in protecting the environment. [2]

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