E-30 at ISO 1600 ...

Started Feb 4, 2013 | Discussions thread
veroman
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Re: Intermediate ISOs and the E-30/E-620, and noise ...
In reply to WhyNot, Feb 7, 2013

WhyNot wrote:

There was an article on Digital ISO a while back in Digital Photo Pro Magazine and you can read it here . What I took from the article was that ISO is raised in a digital system by increasing the gain on the sensor. However, the increasing gain is not a continuous function but a step function so that if the base ISO is 100 it changes 100, 200, 400, … Intermediate values are then computed from one of these steps.

As I recall, one of the things we can never know about a DSLR (or any other digital, I guess) is exactly what that base ISO is.  I believe it's proprietary for each manufacturer.  Tests I've done with all of my Olympus E-cameras suggests that their base ISO is anything BUT ISO 200.  ISO 100 is more like it.  ISO 200 on everything except my E-30 shows a dip in dynamic range.  My old Olympus C-5060 was at its very best at ISO 80 ... the lowest it could go.

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SteveG
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