Comparing Olympus 4/3lenses to FX "Full Frame" offerings

Started Jan 25, 2014 | Discussions thread
JiminDenver Veteran Member • Posts: 5,190

The same amount of light is being delivered to either the 4/3s sensor or the same space it would result in on a full frame sensor.  Otherwise the shutter speed would change in a like situation.

The extra light is from the larger image circle delivering the larger scene onto a full frame sensor.   4/3s sensor can not see or use this extra light because it can not see the rest of the scene that the full frame can.

The same is true if you could adapt a medium format lens to a full frame sensor. Is there more light, yes. Does it make a difference to the full frame sensor, no because it too can not see the whole scene being delivered by the medium format image circle. However it will still require the same f stop to get the same luminance as a medium format rig would in the same conditions as well as if you used the equal full frame lens.

Maybe a easier way for you to understand is a king sized sheet covers more area than a queen, that's a given. Put that king sized sheet on a queen bed and the extra fabric falls to the side. It doesn't make the fabric on the bed any thicker does it? No, it is wasted without the king sized bed it is intended for. So there is extra light but without the sensor big enough for it to fall on, it is wasted and effects nothing.

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