better low light performance (sensor vs lense)

Started Jul 22, 2012 | Discussions thread
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aqasem New Member • Posts: 8
better low light performance (sensor vs lense)

Which is better for low light conditions,
a) if sensor size is 225mm (m43) with f2.0 lense
b) if sensor size is 860mm (FF) with f4.0 lense

which option is better and is it really valid that the lense with large aperture can make huge difference in low light regardless sensor size ? your explaination is appreciated.

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