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Other lenses can go to an F1.2: https://cameras.olympus.com/zuiko/en-us/lens-gallery/ … And since they're micro 4/3 they end up being very small and light compared to other cameras. If you were doing travel photography it'd be pretty damn good too. Now I see why they focused on the micro 4/3 format.
The 600mm lens also has a 1.4x teleconverter pushing it to 840mm, with OIS in body and in lens synced, that's just nuts. Hand held 840mm is crazy. It also has a close focus distance of 1.4m (less with the teleconverter) so you can use it directly as a macro lens too. Crazy!
