There are SO Many foreign symbols and acronyms used in photography. In the past few articles I have tried to explain what a few of those symbols and letters are on your own camera dial. This month I would like to describe what a few other letters mean.
ISO is a standard of film speed or detector sensitivity.
The ISO numbers give us understanding of just how much light will be expected to make our exposure.
Us older photographers May recollect placing the ASA or DIN on the film speed dial back when all there were film cameras. iso 41001 is an acronym for International Standards Organization, ASA is the Standards American Association, and DIN, largely utilized in Europe, was Deutsch Index Number. We bought our film in line with the kind of photography we’d do. A slow speed film with an ASA/ISO of say 50 or 100 was great for photos when there was lots of light, during the middle of the day.
On the off Chance that we anticipated to picture indoors or in low light situations we would search for a faster film with a greater ASA/ISO of say 400 or even 800. Slow speed, fine grain film has smaller silver crystals which demanded more light to excite them to create a picture. However, the picture quality was better since the grains were smaller and much more firmly packed together. As more people wanted to shoot in lower light, the movie manufacturers found that by placing bigger silver crystals on the movie gave the movie more rates.
As the film Rates increased to 800, 1600, and greater, they discovered that the larger grains of these crystals became evident in the last print. Some people preferred the ability to shoot in lower light and the film grain did not bother them. Others, that were keen on nice prints, discovered that the greater grained film produced better results and was worth the movie waiting be exposed somewhat longer.
The lower The ISO, the more light you need to make a correct exposure, the higher the ISO the less light you may need. The benefit of digital cameras is that you can use an alternate ISO for every image in case you must. With film you needed to finish the entire roll of film before shifting to another ISO film.