Sensor size and light capture on different lenses

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cpgr New Member • Posts: 10
Sensor size and light capture on different lenses
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Hello all, i currently own an A6300 with a kit lens 16-50 and a manual FF canon FD 50 1.8 adapted on it which works great.

My confussion is this: I've read that a full frame sensor and an aps-c have one F-stop of light capture difference. Which means that lets say at f4-iso100-1/50 the aps-c version of the image will be 1 stop less bright than the FF one.

But using the compare tool here on dpreview site on an A7 and a A6300 both images of the same brightness were shot on the same exact settings (f,iso,ss) . The only thing that i've noticed, is that the A6300 has always about one stop more noise than the A7

(For example, the 1/50 iso 1600 f/4 image on the apsc, yields the same noise levels as the 1/50 iso 3200 f/4 on the FF image).

Is this the 1 stop difference or is it just a much better performing sensor on the FF ?

Is the amount of light hitting both sensor sizes constant at the same iso-f-ss settings?

As i've tested at f4 both of my lenses (a ff lens and an apsc one) on the same settings give me the same image brightness so i guess all lenses are the same in regard to the amount of light they capture. (Even though field of view and dop change on diff. sensor sizes)

 cpgr's gear list:cpgr's gear list
Sony a6300 +1 more
Sony a6300 Sony a7
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