Exposure basics, lesson two point one (& ISO)

Started Mar 19, 2013 | Discussions thread
Detail Man
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Correction: G3 vs EM5 - Estimates of Ratios of Light Exposure
In reply to Detail Man, Mar 21, 2013
G3 at ISO=1600 and EM5 at ISO=3200

(For the G3 relative to the EM5), the ratio of the Average RAW channel levels divided by the ratio of the DxOMark "Saturation ISO" ratings is 1.494 EV, but when receiving -0.322 EV less light (due to it's higher Shutter Speed), and transducing -0.236 EV less electrons due to it's lower QE. So, the G3/EM5 ratio of the amount of light received in that case seems to be around:

SHOULD READ:

(For the G3 relative to the EM5), the ratio of the Average RAW channel levels divided by the ratio of the DxOMark "Saturation ISO" ratings is 1.494 EV, but when receiving 0.322 EV more light (due to it's lower Shutter Speed), and transducing -0.236 EV less electrons due to it's lower QE. So, the G3/EM5 ratio of the amount of light received in that case seems to be around:

+ 1.49 - 0.322 - 0.236 = + 0.9358 EV (91.289% more light)

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