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  2. Optimum HDTV viewing distance - Wikipedia

    en.wikipedia.org/wiki/Optimum_HDTV_viewing_distance

    If a screen is 50 cm high and it is at a distance of 250 cm, then in picture heights, its distance is 5 H (⁠ 250 / 50 ⁠). Mathematically, this gives the distances shown in the following table: Distance in picture heights. Here the distance is 3.2 picture heights (H). This is the optimal viewing distance for HD 1080 video.

  3. Flat Display Mounting Interface - Wikipedia

    en.wikipedia.org/wiki/Flat_Display_Mounting...

    Most sizes of VESA mount have four screw-holes arranged in a square on the mount, with matching tapped holes on the device. The horizontal and vertical distance between the screw centres respectively labelled as 'A', and 'B'. The original layout was a square of 100mm. A 75 mm × 75 mm (3.0 in × 3.0 in) was defined for smaller displays.

  4. Angle of view (photography) - Wikipedia

    en.wikipedia.org/wiki/Angle_of_view_(photography)

    So a standard 50 mm lens for 35 mm photography acts like a 50 mm standard "film" lens even on a professional digital SLR, but would act closer to a 75 mm (1.5×50 mm Nikon) or 80 mm lens (1.6×50mm Canon) on many mid-market DSLRs, and the 40-degree angle of view of a standard 50 mm lens on a film camera is equivalent to a 28–35 mm lens on ...

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  6. Pixel density - Wikipedia

    en.wikipedia.org/wiki/Pixel_density

    For example, a 100×100 pixel image printed in a 2 inch square has a resolution of 50 pixels per inch. Used this way, the measurement is meaningful when printing an image. In many applications, such as Adobe Photoshop, the program is designed so that one creates new images by specifying the output device and PPI (pixels per inch).

  7. List of photographic film formats - Wikipedia

    en.wikipedia.org/wiki/List_of_photographic_film...

    3.716-inch spool: same picture size as 118 with longer spool 125 roll film 1905 1949 3 + 1 ⁄ 4 × 5 + 1 ⁄ 2 in 82.55 × 139.7 mm like 122 on longer spool; also for stereo pairs, 3 + 1 ⁄ 4 in × 2 + 1 ⁄ 2 in × 2 126 (early roll film) roll film 1906 1949 4 + 1 ⁄ 4 × 6 + 1 ⁄ 2 in 107.95 × 165.1 mm

  8. Mat (picture framing) - Wikipedia

    en.wikipedia.org/wiki/Mat_(picture_framing)

    In the picture framing industry, a mat (or matte, or mount in British English) is a thin, flat piece of paper-based material included within a picture frame, which serves as additional decoration and to perform several other, more practical functions, such as separating the art from the glass.

  9. Foot (unit) - Wikipedia

    en.wikipedia.org/wiki/Foot_(unit)

    The Greek foot (πούς, pous) had a length of ⁠ 1 / 600 ⁠ of a stadion, [12] one stadion being about 181.2 m (594 ft); [13] therefore a foot was, at the time, about 302 mm (11.9 in). Its exact size varied from city to city and could range between 270 mm (10.6 in) and 350 mm (13.8 in), but lengths used for temple construction appear to ...

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