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

sigala1 wrote:

Leo wrote:

Thank you to all for helping. The other benefit: after reading all replies I have check my recently taken photo and YES I am underexposing most of them. I am ETTR using the displayed histogram, however the histogram is related to JPG. The histograms for the most of my photos are approximately from -0.5EV to -1EV below 255. I have found several images that before correction were overexposed and that there are enough room to adjust them down -1EV to -1.5EV without loosing the highlits. No wonder that some of my images are noisy in the low light areas . However, intentionally overexposing may cause overexposure beyond the dynamic range reserve. How you manage this problem?

Leo

At the exposure when you first see an orange blinkie, you can increase the exposure by at least another 2/3 EV without actually clipping the blinkie in the raw file.

No. If you test the matter by means of RawDigger (as I have), you will find that you can't go more than 1/3 EV above what the live-view blinkies indicate without significant clipping in the RAW in at least one channel (usually green). So there's very little difference between what the blinkies tell you and the actual clipping point in RAW. This is with the warning level set to 255 which for obvious reasons is the value that makes most sense.

The existence of the new ISO 100 mode should have put us on alert for the truth of the above.

The above holds for ISO 100 too.