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

Started Jan 25, 2014 | Discussions thread
Sergey_Green
Sergey_Green Forum Pro • Posts: 10,623
No, it is not the reason ..
3

JiminDenver wrote:

The only reason full frame delivers more light is because it delivers a larger scene. Put a 25mm on 4/3s instead of a 50mm and the 4/3s sensor will see the same light a full frame does at 50mm AND it will require the same f stop to achieve the same shutter speed at a given ISO as the full frame does.

25 vs. 50 is for DoF and framing, not the light. However, if you set the same numeric aperture on each, each will have different diameter of the entrance pupil (effective aperture), which in turn under the same light intensity will not let the same total amount of light in (it is impossible). So exposure remains the same, total amount of light not.

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- sergey

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