126 film
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126 film is a cartridge-based film format used in still photography. It was introduced by Kodak in 1963, and is associated mainly with low-end point-and-shoot cameras, particularly Kodak's own Instama
The 126 film cartridge.
A photo of the Holburne Museum of Art, Bath, taken with 126 film and illustrating the square format.
126 negative strip (converted to positive) with numbered leaders on a roll of 20 exposures from the 1970s showing the manufacturer text "Kodak Safety Film" indicating acetate base (non-nitrate).
Kodak Instamatic X-15 with open door and loaded 126 film cartridge
135 film
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135 film, more popularly referred to as 35 mm film or 35 mm, is a format of photographic film with a film gauge of 35 millimetres loaded into a standardized type of magazine for use in 135 film camera
126 film
…coiled tightly and placed in the supply end of the cartridge. The positioning of the image is fixed by the cartridge. The film is 35 mm wide, but unlike 135 film, it is unperforated, except for one registration hole per image, similar to the earlier 828 film. The camera is equipped with a sensing pin which falls…
135 film. The film is 35 mm (1.4 in) wide. Each image is 24×36 mm in the most common "small film" format (sometimes called "double-frame" for its relationship to the "single-frame" 35 mm movie format or full frame after the introduction of 135 sized digital sensors; confusingly, "full frame" was also used to describe the full gate of the movie format half the size).
Leica I, 1927, the first successful camera worldwide for 35 cine film
Soviet camera Smena 6 with 35 mm films
Minox 35 ML, one of the smallest cameras built for the 135 film