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2. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

3. List of photographic film formats - Wikipedia

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

   101.6 × 127 mm 124 roll film 1905 1961 3 + 1 ⁄ 4 × 4 + 1 ⁄ 4 in 82.55 × 107.95 mm 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. Image sensor format - Wikipedia

   en.wikipedia.org/wiki/Image_sensor_format

   The common 1" outside diameter circular video camera tubes have a rectangular photo sensitive area about 16 mm on the diagonal, so a digital sensor with a 16 mm diagonal size is a 1" video tube equivalent. The name of a 1" digital sensor should more accurately be read as "one inch video camera tube equivalent" sensor.

5. List of motion picture film formats - Wikipedia

   en.wikipedia.org/wiki/List_of_motion_picture...

   9.5 mm 1.51 4.1 mm × 6.2 mm 2 central perforations in a 9.5mm film spherical 4.75 mm spherical, rotated 90° 8 mm Panoramic [26] Dimaphot, Paris: 1955 ? 16 mm 1.5 5 mm × 7.5 mm 1 perf, 2 sides spherical 8 mm spherical, rotated 90° Emel Panoscope [27] Emel, Paris: 1955 ? 16 mm 2.7 3.5 mm × 9.6 mm 2 perf, 2 sides spherical 16 mm spherical ...

6. Image resolution - Wikipedia

   en.wikipedia.org/wiki/Image_resolution

   35 mm film is scanned for release on DVD at 1080 or 2000 lines as of 2005. The actual resolution of 35 mm original camera negatives is the subject of much debate. Measured resolutions of negative film have ranged from 25–200 LP/mm, which equates to a range of 325 lines for 2-perf, to (theoretically) over 2300 lines for 4-perf shot on T-Max 100.

7. Four Thirds system - Wikipedia

   en.wikipedia.org/wiki/Four_Thirds_system

   The usual size of the sensor is 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm, giving a diagonal of 21.64 mm. [17] [18] The sensor's area is about 30–40% smaller than APS-C sensors used in most other DSLRs, but still around 9 times larger than the 1/2.5" sensors typically used in compact digital cameras.