So, what exactly does shooting at f/2 bring you?

Started 3 months ago | Discussions thread
OM-G New Member • Posts: 6
Re: So, what exactly does shooting at f/2 bring you?

Low F-number is always good for AF.

There is no automatic advantage to low light AF for larger sensor.
AF has more to do with light intensity per area, and in that regard F2=F2.

A mFT camera with a F2 lens will have around a 2 stop advantage in low light AF compared to an equivalent FF F4 lens.


Focus sensitivity for the Sony A7S II is EV-4 (ISO 100 equivalent with F2.0 lens)
Focus sensitivity for the Olympus EM1 III is  EV-4.5 (ISO 100 equivalent with F2.0 lens)

Same thing applies to exposure metering.

The point is that you cant just take a FF system with a 2-stop slower lens and think its equivalent in focus and metering. An eqivalent FF lens in this regard would have to be F2 and way bigger.

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Olympus OM-D E-M5 Olympus E-M1 II Olympus M.Zuiko Digital 45mm F1.8 Samyang 7.5mm F3.5 Fisheye Olympus M.Zuiko Digital ED 75mm F1.8 +6 more
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