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Olympus E-PM2 Actual ISO vs IS0 set in camera?

Started Aug 17, 2014 | Discussions thread
assaft
assaft Senior Member • Posts: 1,483
Re: Olympus E-PM2 Actual ISO vs IS0 set in camera?
1

The ISO values correspond to levels of brightness but the standard does not dictate how to achieve these values in terms of analog gain vs. digital gain.

Panasonic cameras rely mostly on analog gain while Olympus cameras rely on both.

In your case, the GX-1 reaches the brightness of ISO 200 (for example) mostly (if not solely) by analog gain. The E-PM2 reaches the brightness of ISO 200 by less analog gain (50% of the GX-1) and then some digital gain that brightens the image. So you end up with the same brightness, but by two different approaches underlyingly.

You may find this interesting.

 assaft's gear list:assaft's gear list
Olympus PEN E-PL2 Olympus OM-D E-M10 Olympus M.Zuiko Digital ED 9-18mm F4.0-5.6 Panasonic Lumix G 20mm F1.7 ASPH Panasonic Lumix G 14mm F2.5 ASPH +6 more
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