Olympus 17mm f1.2 vs Fujifilm x100v f2

Started 3 months ago | Questions thread
Samuel Dilworth
Samuel Dilworth Senior Member • Posts: 1,076
Re: Olympus 17mm f1.2 vs Fujifilm x100v f2

The Fujifilm has a 23.5 × 15.6 mm sensor, so the sensor area is 366.6 mm^2.

Micro Four Thirds cameras typically have a sensor area around 17.3 × 13.0 mm for an area of 224.9 mm^2. That makes the Fujifilm sensor 1.63 bigger. It therefore collects 1.63 times more light at a given f-number.

However, the f-numbers are different here (f/1.2 versus f/2). The Olympus image is (2 ÷ 1.2)^2 = 2.78 times brighter than the Fujifilm image, and 2.78 ÷ 1.63 = 1.70. So in the end the Olympus collects 1.70 more light. That’s about two-thirds of a stop faster without all of this needless precision.

This ignores vignetting differences and sensor efficiency differences that might sometimes matter, but you get the idea.

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