E-M5 Firmware update... V 2.0 today..

Started Jan 29, 2014 | Discussions thread
duartix Veteran Member • Posts: 3,586
Re: Incorrect Explanation

texinwien wrote:

Thomas Niemann wrote:

Two new features were included in the firmware update: ISO 100 and small focus points.

ISO 100. In the ISO menu you'll notice ISO 100 is marked as LOW and ISO 200 is Recommended. This indicates that ISO 100 is actually ISO 200 over-exposed by one stop. For example, if the ISO 200 exposure was 1/100 @ f/4, and you shot it at 1/50 instead, you would be over-exposing by one stop. And 1/50 @ f/4 would be the proper exposure for ISO 100. The result would be highlight clipping and less dynamic range because ISO 200 is the optimal ISO for the sensor. As a benefit, shadows would receive more exposure and, consequently, less noise.

As I have noted elsewhere in this thread, this explanation is incorrect. It is incorrect for the E-M1 and the E-P5, and will with practical certainty also be incorrect for the E-M5.

ISO 200 on the E-M5 (and all of the other Olympus m43 cameras with this Sony sensor) is actually ISO ~100 underexposed. The new LOW settings will be like ISO 100 exposed correctly.

Are you talking about this? http://www.dxomark.com/Cameras/Olympus/OM-D-E-M1#tabs-2
Then you also mean that ISO400 is also ISO ~200 underexposed and that ISO800 is ISO ~1600 underexposed, and so on...
We were talking nominal ISO here, that's why it gets confusing. But if this is your reason, then it's nothing but a JPEG trick.

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Duarte Bruno

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