Photographic film as a medium for capturing and storing images taken with an analog camera.
Photographic film roll
Photographic film is used as a medium for capturing and storing images taken with an analog camera. It is made up of various layers including photosensitive material.
The base support is made of plastic material, then we have successive layers with silver halide emulsions and variable size crystals.
The photosensitive material is joined with gelatin to the halide emulsion.
If the film is exposed to light exposure, an image is impressed on it.
To make this image stable and therefore insensitive to further exposure to light, it is necessary to proceed with chemical and fixing processes.
There are photographic films of various types and sensitivities.
The most common are those in the 35 mm format available in various ASA sensitivities.
The choice then varies between black and white, color and slide films.
There is a difference between print film and slide film.
The print film after the chemical development process produces a negative that must be printed on paper with another process to reproduce the real (positive) image, therefore another step is necessary after development.
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The film for slides, on the other hand, does not require the second step, since after being developed it is ready to be projected through a special projector on a screen or a wall.
The term asa defines the sensitivity value of the film, i.e. the greater or lesser ability to impress the photos taken on the photosensitive layer according to the light present.
It is commonly said that at a higher asa value the film is faster as it allows you to take pictures in low light environments without using the flash with slower shutter speeds or to block moving objects with even faster shots.
As a disadvantage, it must be said that a larger asa also corresponds to more grain in the film which corresponds to larger and therefore more visible silver halide molecules.
