It may be a simple question: what is ISO in photography? However, the answer isn't quite so straightforward – mainly because it's a term that originated before digital imaging.
So, let's rewind: what is ISO in photography in terms of analog shooting? Camera film comes in different speeds, with a higher ISO rating equating to a ‘faster’ film – which means it is more sensitive to light, enabling you to use faster shutter speeds than you can with ‘slower’ film.
