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  2. Whirlpool Galaxy - Wikipedia

    en.wikipedia.org/wiki/Whirlpool_Galaxy

    The Whirlpool Galaxy, also known as Messier 51a (M51a) or NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. [ 6 ] [ 7 ] [ 8 ] It lies in the constellation Canes Venatici , and was the first galaxy to be classified as a spiral galaxy. [ 9 ]

  3. Barn door tracker - Wikipedia

    en.wikipedia.org/wiki/Barn_door_tracker

    A barn door tracker, also known as a Haig or Scotch mount, is a device used to cancel out the diurnal motion of the Earth for the observation or photography of astronomical objects. It is a simple alternative to attaching a camera to a motorized equatorial mount. [1]

  4. Lens mount - Wikipedia

    en.wikipedia.org/wiki/Lens_mount

    The Panavision mounts are exclusively used with Panavision lenses, and thus are only available on Panaflex cameras or third-party cameras "Panavised" by a Panavision rental house, whereas the PL-mount style is favored with most other cameras and cine lens manufacturers. Both of these mounts are held in place with locating pins and friction ...

  5. M51 Group - Wikipedia

    en.wikipedia.org/wiki/M51_Group

    The M51 Group is a group of galaxies located in Canes Venatici.The group is named after the brightest galaxy in the group, the Whirlpool Galaxy (M51A). Other notable members include the companion galaxy to the Whirlpool Galaxy and the Sunflower Galaxy (M63).

  6. NGC 5195 - Wikipedia

    en.wikipedia.org/wiki/NGC_5195

    NGC 5195 (also known as Messier 51b or M51b) is a dwarf galaxy that is interacting with the Whirlpool Galaxy (also known as M51a or NGC 5194). Both galaxies are located approximately 25 million light-years away in the constellation Canes Venatici .

  7. Astrophotography - Wikipedia

    en.wikipedia.org/wiki/Astrophotography

    Film astrophotography is becoming less popular due to the lower ongoing costs, greater sensitivity, and the convenience of digital photography. Video of night sky made with DSLR camera's time-lapse feature. The camera itself is moving in these shots on a motorized mount.

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