What is the difference between latitude and sensitivity?

Sensitivity is a measure of the amount of light required to accurately expose a film. The United States is ISO, Germany is DIN, ISO100 is approximately equal to 21DIN.

Latitude, in layman’s terms, is the photosensitive range that can produce clear images after exposure. Black and white film is the largest, color negative film is second, color positive film is third, and digital is the smallest.

The American standard ISO is also commonly known to us. . Usually civilian films are ISO100, ISO200, and ISO400. The smaller the number, the more exposure it requires. The number increases at a rate of 1 times, and the required exposure is 1/2 of the former. Generally, ISO100 follows the Sunlight 11 Rule. Under direct sunlight, using a combination of 1/125 shutter speed and 11 aperture can obtain accurate exposure. Other films, through their multiplication rules, can obtain different shutter aperture combinations. At present, ISO3200 and ISO6400 films have rough imaging and are only suitable for certain professional fields that do not require image quality. On the contrary, 1/50 film has fine imaging and requires higher exposure time. At present, digital cameras, CCD or CMOS photosensitive elements, obtain different amounts of information for different photosensitive times. The original film production standards are also set to ISO. The principles are different, but the effects are similar.

Latitude, in layman’s terms, is the photosensitive range that can produce clear images after exposure. Black and white film is the largest, color negative film is second, color positive film is third, and digital is the smallest. In other words, black and white films can be divided into the most grayscale levels from white to black, and can most realistically restore the environment at that time. Color negative films can generally correctly restore the color gradations within the positive and negative two-stop exposures, while positive films can only correctly restore the color gradations within the positive and negative 1/2 to 1/3-stop exposures, with considerable loss of color gradations beyond that. Due to the different photocopying processes between negative and positive films, the imaging of negative films can be adjusted later, while the positive film only determines the exposure in the early stage, making it very conducive for beginners to master the exposure technology, and it is also very conducive to the artistic creation of professional photographers. Moreover, positive film has the characteristics of bright images and delicate colors, which is favored by most landscape photographers. The tolerance of digital photos is related to their digital standards and cannot be generalized. It can only be said that in the JPEG format, any adjustment is based on the loss of image color.