FILM SPEED by Anurag
Mar 28, 2018 Written by Anurag Pant Film speed
Top 10-imp points about Film Speed :
Cinematography course Assignmnet No:1: date.28th.March.2018
- Film speed is the measure of a photographic film sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to describe the relationship between exposure and output image lightness in digital cameras.
- In Digital Photography ISO measures the sensitivity of the image sensor. The same principles apply as in film photography – the lower the number the less sensitive your camera is to light and the finer the grain. Higher ISO settings are generallyused in darker situations to get faster shutter speeds.
- In photography, ASA and ISO are both measurements of film speed, or sensitivity to light. ASA is a scale created by the American Standards Association, but it is no longer widely used. Now, most film is labeled by ISO, which was created in 1987 by the International Organization for Standardization.
- Fast films of ISO 400, 800 and higher are recommended for dim lighting or fast action such as sports photography. A fast film lets you use a high shutter speed to “freeze” rapid motion and minimize blurring with handheld shooting or telephoto lenses
- The higher ISO will be more sensitive to light than a lower.
- The film speed is determined with a calibration number than can be used to compare different film and the capture an image when expose to minimal light
The sensitivity of a photographic material as rated by a standard method of exposure and
determination such as ISO speed and DIN
8. Slow film speed is grain of light sensitive material in the flim are very small and work well for creating larger prints from thesmall negative
9. Faster speed film is motion blur is minimize and often yield a great depth of field as shutter speeds are faster and the aperture remains somewhat closed.
10. High speed flim of this film requires minimal light to make an exposure and may be useless in sunny conditions .The bright light of sunny day will require very fast sutter speeds and apertures that will only result in frozen in fronzen motion and greatb depth of field.