Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
Senior MemberPosts: 1,333Gear list
Re: Why 'more or less stopped using ISO'?
In reply to Iliah Borg, Feb 20, 2014

I take images of a gray card under constant illumination.  I change exposure by either 1/2 or 1/3 stop from well over exposed to very dark.  I take two images at the recommended exposure.  That makes a flat spot on the curve where the recommended expose is.

Here are two curves for Pentax:

Pentax K10D with 16-45 lens in Sunny Conditions

K10D Legacy Screw Mount Lens in Shade

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