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What is photographic film?
Photographic film is a sheet of plastic that has been specially treated to make it sensitive to light. A regular film can store up to 40 pictures. When it has been filled, it can undergo a special chemical treatment to make the pictures visible to us.
Film speed is the measure of a photographic films sensitivity to light as determined by sensitometry and measured on various numerical values, the most recent of which being the ISO system.
Light sensitivity expresses the speed of photographic negative materials.
Film can come in different sizes. These include 35mm, 8mm, 16mm and 70mm.
Sensitometry is the scientific study of light sensitive materials, including photographic film.
Slower films speeds would be used in darker situations they require a longer exposure time and usually a tripod to stabilise the image. Slower film speeds would be more ideal for pictures such as portraits because it minimises grain and maximises precision and sharpness. Faster film speeds are used with a shorter exposure time and are generally used during the day and/ or to capture fast movements, such as sports.
Most camera films have the same amount of SHC. The variables for the speed are determined on the iodine content and the crystal size. Films with larger crystals are usually grainier where as the smaller crystals are sharper. Faster film speeds have larger crystals as they are more sensitive to light.
The different speeds of film that can be used in a 35mm camera are 100, 200, 400, 800, and 1600.
This photograph was taken using a fast film speed. This is because its a fast moving object that needs to be captured very fast.
This was effective because it makes the photo very sharp and shows the movement within it.
The photograph was taken in bright light as it was a fast film speed and not much light was captured.
You can tell it was taken with fast film speed because it is sharp and is more in the moment. It wasn't as planned as a slow film speed would have been as it is taken quickly rather than over a longer period of time.
By Lewis Woods and Rianna Dulake
The photo was taken with a slow film speed. This can be seen via the various aspects of the photo, such as the water, light and background.
The photo was taken with a tripod. You can tell because the picture looks sharp. if it was taken free-hand it would be blurred to some extent.
A slow filmspeed was used as it is quite late in the day and the sun is barely in sight. As it was taken with a slow film speed it makes the darker colours stand out more and balances the light levels of the photo.
You can tell it is a slow film speed as the water looks 'milky' or 'steamy'. This is from the long exposure reflecting the light from the water.