The Formats Of Photographic Film
In previous articles we talked about the history of photography and the art, complete with explanatory film, used for the production of photographic film. Films which, as mentioned, exist in different formats. But what are the most common formats or rather, those who are still currently on the market?
Size certainly most famous is the 35mm, also simply called 135. This film, in spite of what you might believe, was not created specifically for photography as for cinematography smilesmultimedia. Precisely for its use inside the cameras they were introduced sequences of holes in the top and bottom of the film so that the same could advance (remember the cameras crank) of the tracking wheels. In his film format, the photosensitive area was equal to 18X24 mm: the height of the frame was therefore equal to half of what is indicated in the name known to us (apart from a millimeter of frame), only introduced at a later time, or when photography static adopted this type of film, but doubling the height: 36 × 24 mm.
The 35mm film with its holes advancement allowed the camera manufacturers (there were not yet automated production machinery) to produce equipment that is very simple and cheap and this allowed the boom of photography. By the way, the traditional metal-plastic cylinder (which serves as both a physical protection against the light) that allowed the masses replacement within seconds of the film was introduced by a grand name in the photographic universe: Leica (the inventor was some Oskar Barnack)
The 35mm film, as is now almost only relegated to lomography (with all major manufacturers that have closed factories), has become a landmark in the digital world: all sensors are in fact sized on it. The full frame SLR are in fact equipped with sensors of the size equal to 36x24mm while all the compact express the size of its own sensor relating them to it (for example, ½, 5, 1 / 1.6, and so forth).
A second film which is still very widespread and used for the photography of large dimensions (the film still costs much less than that of sensors of larger dimensions of 35mm) is that defined Medium Format. The advantage of the film Medium Format is the ability to allow a greater imaging area than the 135 but at the same time be “enough” to handle, especially when compared to the large format, or rather to the optical bench.