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<blockquote data-quote="STM" data-source="post: 123073" data-attributes="member: 12827">ASA - American Standards Association. It was used with film to denote film speed. DIN was basically the same thing, but was used in countries who were metric and had a different numbering system). It eventually was replaced with ISO, or International Standards Organization. ASA 100 was just called ISO 100. But digital sensors work completely differently than film. You can vary the sensitivity of a digital sensor quite a bit, actually you just change the amplification of the signal whereas with film you were pretty much stuck with a single speed within a pretty narrow . You could &quot;push&quot; (expose it as though it had a higher ASA and extend development) or &quot;pull&quot; (expose it as though it had a lower ASA and reduce the development). The Zone System uses push and pull development based on where you place your exposure values. The old addage is you expose for the lows (lower EV's) and develop for the highs (higher EV's)There is another book you can find on the Zone System which is less theoretical and more practical. I have it too and use it as a quick reference when I need it. It is called the Practical Zone System, written by Chris Johnson. It is an excellent book in paperback and about half the thickness of just one of Ansel's books.</blockquote>

[QUOTE="STM, post: 123073, member: 12827"] ASA - American Standards Association. It was used with film to denote film speed. DIN was basically the same thing, but was used in countries who were metric and had a different numbering system). It eventually was replaced with ISO, or International Standards Organization. ASA 100 was just called ISO 100. But digital sensors work completely differently than film. You can vary the sensitivity of a digital sensor quite a bit, actually you just change the amplification of the signal whereas with film you were pretty much stuck with a single speed within a pretty narrow . You could "push" (expose it as though it had a higher ASA and extend development) or "pull" (expose it as though it had a lower ASA and reduce the development). The Zone System uses push and pull development based on where you place your exposure values. The old addage is you expose for the lows (lower EV's) and develop for the highs (higher EV's) There is another book you can find on the Zone System which is less theoretical and more practical. I have it too and use it as a quick reference when I need it. It is called the Practical Zone System, written by Chris Johnson. It is an excellent book in paperback and about half the thickness of just one of Ansel's books. [/QUOTE]

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