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2. Stage lighting accessories - Wikipedia

   en.wikipedia.org/wiki/Stage_lighting_accessories

   Barn doors, or occasionally a set of barn doors, are an attachment fitted to the front of a Fresnel lantern, a type of lantern used in films, television, and theatres. [1] The attachment has the appearance of a large set of barn doors, but in fact there are four leaves, two larger and widening on the outside, two smaller and getting narrower ...

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 .

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5. Astrophotography - Wikipedia

   en.wikipedia.org/wiki/Astrophotography

   They include commercial equatorial mounts and homemade equatorial devices such as barn door trackers and equatorial platforms. Mounts can suffer from inaccuracies due to backlash in the gears, wind, and imperfect balance, and so a technique called auto guiding is used as a closed feedback system to correct for these inaccuracies.

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