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Sony A7RII ISO Invariance
Should You Underexpose, or Use High ISO?
Forest Floor. Ontario. October, 2015. Sony A7RII with 90mm Macro @ ISO 4000
A Story
Back in the early days of digital photography – around 2001 / 2005 – a standard part of my seminars and lectures was to make a provocative statement... "Film is digital. Sensors are analogue." This would freak people out because many believed at the time that there was something inherently "purer" about analogue imaging.

I would point out that film was inherently digital in nature because a silver halide particle when exposed to light would either turn black or not turn black. On-off. Yes-no. This is digital behaviour.  It's when you have millions of such particles displaying semi-stochastic behaviour at a microscopic level that we produce the appearance of a continuous tone image.

A camera sensor, on the other hand, is an analogue device. Each sensel (p...

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Michael Reichmann is the founder of the Luminous Landscape. Michael passed away in May 2016. Since its inception in 1999 LuLa has become the world's largest site devoted to the art, craft, and technology of photography. Each month more than one million people from every country on the globe visit LuLa.
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