F1.8
The depth of field at f1.8 isn't as shallow on a Micro Four Thirds camera as I'd like, but it's shallow enough for reasonably defocused backgrounds.
(Olympus OM-D E-M5, 1/2000 sec, f1.8, ISO 200, ESP metering, AWB, processed raw in ACR with sharpening set to 10)
Discuss: Olympus M.Zuiko 75mm f1.8 lens photo samples
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