What is ISO sensitivity ?

  1. What is ISO sensitivity ?

ISO sensitivity refers to the term used in the era of film cameras, where sensitivity was adjusted by changing the film. For example, if one wanted to increase shutter speed but lower sensitivity, they would switch to a film with a higher ISO sensitivity.




Even though film cameras are no longer prevalent, some digital cameras, such as compact digital cameras and digital single-lens reflex cameras, continue to offer ISO sensitivity settings. This is due to the background belief that for users accustomed to ISO sensitivity, expressing sensitivity settings in ISO values would be more intuitive and understandable.




However, in today’s industrial cameras, there are few that utilize ISO notation for sensitivity settings. Our company’s cameras also do not allow sensitivity settings in ISO notation.

While ISO sensitivity is not available, there are several methods to adjust brightness.



Brightness in industrial cameras is adjusted using the following methods, although not through ISO sensitivity:

– Changing the aperture of the lens (generally, larger aperture means brighter)
– Adjusting the aperture of the lens
– Adjusting with lighting (using lighting fixtures to adjust brightness, applying strong strobe light to increase brightness, etc.)
– Adjusting exposure time of the camera (increasing it makes the image brighter)
– Adjusting gain (increasing it makes the image brighter)

Note: Increasing gain too much deteriorates the signal-to-noise ratio, making grainy noise more prominent.