ISO 100, OMD-EM1II and firmware 3.0?

Started 2 months ago | Questions thread
Richard Turton Regular Member • Posts: 238
Re: ISO 100 Compared to Overexposure

Cafe Racer wrote:

Richard Turton wrote:

Can the same results as ISO 100 be obtained by over exposing ISO 200 by one stop? The answer is no. The Signal/Noise Ratio of ISO 100 is almost a full stop better than ISO 200 overexposed by one stop. The available headroom is lower with ISO 100, but as long as clipping does not occur you will get less noise with ISO 100.

Have you tested the E-M1ii to see if an ISO 100 image has any additional brightness added?

What do you mean by "brightness added"?  These measurements apply to the raw files without post processing.  ISO 64 & 100 are 1.7 stops "brighter" than ISO 200, but the total noise is only about 1 stop higher so the low ISO files look cleaner.

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