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  2. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    Turning is a term used when referring to moving the level to take an elevation shot from a different location. To "turn" the level, one must first take a reading and record the elevation of the point the rod is located on. While the rod is being kept in exactly the same location, the level is moved to a new location where the rod is still visible.

  3. Level (optical instrument) - Wikipedia

    en.wikipedia.org/wiki/Level_(optical_instrument)

    The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...

  4. Guide number - Wikipedia

    en.wikipedia.org/wiki/Guide_number

    The guide number here (full power setting, ISO 100, and normal-angle coverage) is 37 for calculations made in meters (yellow arrow) and 120 for feet (orange). For instance, on the foot scale, f /4 × 30 ft = 120, as do both f /8 × 15 ft and f /16 × 7.5 ft. In meters, f /1.4 × 26 m = 37 as do f /22 × 1.7 m and every combination between.

  5. 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 ...

  6. 30 Movie Mistakes You Missed That May Change The Way You ...

    www.aol.com/lifestyle/49-screen-movie-tv-show...

    Image credits: Ssiscool To understand how mistakes like these slip past countless pairs of eyes and make it into the final cut, Bored Panda reached out to Aimie Smith, a 21-year-old film student ...

  7. The best artificial Christmas trees of 2024, tested by AOL

    www.aol.com/lifestyle/best-artificial-christmas...

    We put all the best artificial Christmas trees to the test, ... from as small as 4.5 feet to a towering 15-foot option, and it was one of the most full and lush products we tested, with more than ...

  8. Topographic Abney level - Wikipedia

    en.wikipedia.org/wiki/Topographic_Abney_Level

    In 1914 and 1915, the Forestry Quarterly published a series of articles on the use of the Abney level. [6] [7] [8] These tutorial articles remain useful today, but the primary reference for usage is the 1927 Abney Level Handbook. [3] The Abney level is typically used at the eye height of the surveyor, either hand-held or mounted on a staff at ...

  9. 6 ways to level up s’mores

    www.aol.com/lifestyle/6-ways-level-mores...

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