ISO – The Third Exposure Control

There is a big difference between the ISO of a film and the ISO of a sensor. There is even difference between sensors’ ISO from various brands. David Hay shares his knowledge and findings on the subject

When we used to use film cameras we had only two controls to set the exposure: aperture and shutter speed. They acted like a seesaw. When you pushed down the aperture to a smaller size, the shutter speed had to be made longer to compensate. A fast shutter speed required the use of a wide aperture. There was only one amount of light that gave the correct exposure on every frame of a film. The only choice we had was how to allocate that light between aperture and shutter speed. As soon...

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About Author

David Hay

I took up photography at the age of eleven and have been passionate about it ever since. As a retired biologist I still marvel at the beauty of the natural world and try and capture the colours and forms of natural things around me.

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