Sandman
So with the D5, it can boost its ISO to ISO 3,280,000, and suddenly how ISO is named is becoming just stupid. We should use EV steps instead:

Whisky-dave
SO why start at -1 ?

Sandman
The base would be what is today called ISO 100, which corresponds to an expected brightness level of the resulting bitmap image.

Whisky-dave
Why limit it to bitmaps?

Sandman
Because ISO is film sensitivity and sensor amplification, so it's only a variable for the resulting image.

Whisky-dave
which might not be a bitmap image BMP. It'sz got nothing to do with sensor amplification eithert.