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What does it mean when film for photographs are 200 or 400 or 800?
The numbers refer to film speed or ISO; witch is another way of saying sensitivity. Each of the standard ISOs (listed bellow) is twice as sensitive as the one before it. The higher the number is the more sensitive the film. While a higher sensitivity film will allow you to shoot in lower light conditions it increases the appearance of grain. Not sensitive
How are ISO standards developed?
ISO stands for International Standards Organisation, it comes from when the sensitivity of films became standardised. It refers to the speed that your camera responds to light. The higher the ISO number the more sensitive the film or digital sensor is to light. If you choose to use a lower ISO(lower sensitivity) setting you will have to have a longer exposure, this is known as slow film. Fast film is when you have a higher sensitivity and a faster exposure. A higher ISO setting allows a faster shutter speed with the same aperture setting, this means the picture will have less Blur. The downside it that the Higher the ISO the more noise (or grain) your image has.
When a x-ray photograph is taken why is it necessary to have the film in a light proof cassette?
Film is light sensitive so any exposure to the film will fog it. Most film comes either in a cassette, as in 35mm or roll-film which is protected by a paper leader and trailer. Professionals also use cut film which is hand loaded in the dark into film holders. Once a film is exposed in the camera it has what is called a latent image. It stays latent until processed. Once all the film is exposed it needs to be processed as soon as possible. Once the film is exposed its sensitivity makes it more susceptible to fogging and therefor must be protected from light. In the case of 35 mm and 120 roll film it shouldn't be much of a problem as the film is protected by the cassette or the backing paper. Once the film is taken out of its protection it has to be in total darkness. Colour film is sensitive to all colours and light. Monochrome film is what is called panchromatic. This means that although the film is mono it still records colours as grey tones so it must be handled in complete darkness. Black and white papers as used for monochrome prints are sensitive to only certain colours of the visible spectrum so can be viewed under dim yellow light. Blue light would fog the paper which is why in a black and white darkroom yellow filters are used for processing paper prints.
How black shadows are formed?
In film, expose for bright. Surrounding areas fall off into darker shadows. If they don't quite reach black, use more sensitive film to extend its range or lower your white setting.
What does it mean when negative film is light?
If it is a black and white negative, more light will pass through the lighter part. Since this is a reversal process, the light parts of the negative will be more exposed and produce a dark image.
Which filmspeeds are the most sensitive to light?
The higher the film speed, the more sensitive it is to light. Some films with very low film speeds (below ISO 25) might be able to be handled in ambient light!
Which type of photoreceptor cells, cones or rods, are more sensitive to light?
Rods are more sensitive to light than cones.
Is the faster color film grainier then a slower film?
Yes. Faster the film more grain, but the sharper the image..
What does it mean when film for photographs are 200 or 400 or 800?
The numbers refer to film speed or ISO; witch is another way of saying sensitivity. Each of the standard ISOs (listed bellow) is twice as sensitive as the one before it. The higher the number is the more sensitive the film. While a higher sensitivity film will allow you to shoot in lower light conditions it increases the appearance of grain. Not sensitive
Why are rods more light sensitive compared to cones?
Rods are more light sensitive compared to cones because they contain a pigment called rhodopsin that is more sensitive to low levels of light. Cones, on the other hand, contain different pigments that are less sensitive to light but are able to detect different colors.
How do you set the ISO on a film camera?
To set the ISO on a film camera, you need to adjust the dial or button on the camera to the desired ISO setting. The ISO setting determines the sensitivity of the film to light. A higher ISO number makes the film more sensitive to light, while a lower ISO number makes it less sensitive. Make sure to set the ISO before taking photos to ensure proper exposure.
Which type of photoreceptor, rods or cones, is more sensitive to light?
Cones are less sensitive to light than rods.
Are rods more sensitive to light than cones in the human eye?
Yes, rods are more sensitive to light than cones in the human eye.
How are ISO standards developed?
ISO stands for International Standards Organisation, it comes from when the sensitivity of films became standardised. It refers to the speed that your camera responds to light. The higher the ISO number the more sensitive the film or digital sensor is to light. If you choose to use a lower ISO(lower sensitivity) setting you will have to have a longer exposure, this is known as slow film. Fast film is when you have a higher sensitivity and a faster exposure. A higher ISO setting allows a faster shutter speed with the same aperture setting, this means the picture will have less Blur. The downside it that the Higher the ISO the more noise (or grain) your image has.
How are standards developed?
ISO stands for International Standards Organisation, it comes from when the sensitivity of films became standardised. It refers to the speed that your camera responds to light. The higher the ISO number the more sensitive the film or digital sensor is to light. If you choose to use a lower ISO(lower sensitivity) setting you will have to have a longer exposure, this is known as slow film. Fast film is when you have a higher sensitivity and a faster exposure. A higher ISO setting allows a faster shutter speed with the same aperture setting, this means the picture will have less Blur. The downside it that the Higher the ISO the more noise (or grain) your image has.
When a x-ray photograph is taken why is it necessary to have the film in a light proof cassette?
Film is light sensitive so any exposure to the film will fog it. Most film comes either in a cassette, as in 35mm or roll-film which is protected by a paper leader and trailer. Professionals also use cut film which is hand loaded in the dark into film holders. Once a film is exposed in the camera it has what is called a latent image. It stays latent until processed. Once all the film is exposed it needs to be processed as soon as possible. Once the film is exposed its sensitivity makes it more susceptible to fogging and therefor must be protected from light. In the case of 35 mm and 120 roll film it shouldn't be much of a problem as the film is protected by the cassette or the backing paper. Once the film is taken out of its protection it has to be in total darkness. Colour film is sensitive to all colours and light. Monochrome film is what is called panchromatic. This means that although the film is mono it still records colours as grey tones so it must be handled in complete darkness. Black and white papers as used for monochrome prints are sensitive to only certain colours of the visible spectrum so can be viewed under dim yellow light. Blue light would fog the paper which is why in a black and white darkroom yellow filters are used for processing paper prints.
What is the difference between asa film and iso film?
ASA and ISO both refer to film speed, or the film's sensitivity to light. ASA is the American standard, while ISO is the international standard. They essentially measure the same thing, which is the film's sensitivity to light, with higher numbers indicating a faster film speed.
