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how photographic film works - transparency film

by:Cailong     2019-07-15
how photographic film works  -  transparency film
When you buy film for your camera, you have a lot of options.
Hose products with the word "color" in the name are usually used to make color prints that you can hold in your hand and watch by reflecting light.
The negative returned with your photo is the exposure in your camera.
Products with the word "chrome" in those names produce color transparency (slides)
This requires some form of projector to watch.
In this case, the returned slide is the actual film exposed in the camera.
Once you decide to print or slide, the next major decision is the speed of the movie.
In general, the relative speed level of a movie is part of its name (
MYColor movie 200 for example).
The ISO and ASA speed levels are usually also printed somewhere in the box.
The higher the number, the faster the movie will be ".
"Faster" means increasing the sensitivity of light.
When you shoot fast moving objects and want them in focus, or when you want to take pictures in a dimly lit environment without the benefit of extra lighting, you want a faster movieLike a flash).
When you make the movie faster
The turn off is that the increased light sensitivity comes from the use of larger silver-halide grains.
These larger particles can cause spots or "particles" in the picture, especially if you plan to go from 35-mm negative.
Professional photographers may use larger
The format is negative to reduce the magnification and texture appearance in its print. The trade-
Between the speed of photography and the particles is an inherent part of traditional photography. Photographic-
Film makers are constantly making improvements to get faster films with fewer particles. A slow-
Speed film is desirable for portrait photography, in which you can control the lighting of the subject, the subject is still, you may need to print a large photo from the negative
More fine silver
The halogen particles in this film produce the best results.
Senior Amateur photographers may encounter other movie names such as tungsten balance or daylight balance. A tungsten-
The balance film is used indoors and the main light source comes from tungsten wire bulbs.
Since the visible lighting from the bulb is different from the lighting from the Sun (daylight)
, The spectral sensitivity of the film must be modified to produce a pleasant picture.
This is the most important thing when using transparent film.
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