A thing to consider when judging V1/J1's ISO Performance

Started Jan 24, 2013 | Discussions thread
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IVN
IVN
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A thing to consider when judging V1/J1's ISO Performance
Jan 24, 2013

"We found that measured ISO from the V1 is roughly 1/3EV higher than indicated - so ISO 100 = ISO 125 (approx)."

"By our tests, the E-PM1's measured sensitivities are about 1/6 stop lower than indicated (i.e. images are fractionally darker than expected for any given set of exposure values), which is within the tolerance allowed by the ISO specification."

"By our tests, the E-M5's measured sensitivities are about 1/3 stop lower than indicated across the ISO range (i.e. images are fractionally darker than expected for any given set of exposure values)."

What does this mean? Nikon V1's ISO100 is comparable to to ISO145 on the Oly PM1 and ISO166 on the Oly E-M5.

Now lets put this into perspective:

Say you are shooting with the Nikon V1 and the 18.5 f1.8 in low light conditions, and lets say you need ISO3200 for 1/50 @ f2. If you were to shoot the same scene with a Oly PM1 and the 20 f1.7 at same aperture and exposure you would need ~ISO4600. With the E-M5 you would need ~ISO5300.

Doesnt look so great for the old and new mFT sensor any longer.

Now go and take a look at high ISO test samples, and keep the difference in real sensitivity in mind.

Nikon 1 V1 Olympus PEN E-PM1
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