In the article is shows an APS sensor does not use the full aperture of a FF lens. Since f-stop is focal length divided by lens diameter and has no relationship to sensor size, this is confusing. Couldn't an APS lens be made with a much smaller diameter since much of it is not being used and still have the same light gathering? Are we saying an APS F1.8 lens projects more light on to an APS sensor since f-stop does not change with sensor size? An APS lens will vignette on a FF sensor because it concentrates light more to the center than a FF lens. Say for a 50mm lens couldn't a lens direct all the light of a 28mm opening towards an APS size sensor rather than spreading it out over a FF size sensor? We would see vignetting on the FF sensor with the lens because the light is more focused. To me then this F/1.8 lens would put the same amount of light on the APS sensor (but more concentrated to a smaller area) as a FF lens would on a FF sensor.
I want to thank Panasonic for knocking a little sense in to Sony pricing. Isn't there an LX8 coming soon too? ;) Thank you for the comparison. The FZ looks formidable and so far I prefer its RAW files over the RX. I like the longer reach option too since it is a fixed lens.
G1Houston: The mirrorless market is small and the one for m4/3 is even smaller which now already has two players. Adding a third player will first compete with the two existing ones, which means even less profits for everyone. Less profit means even more difficult time to survive and to invest in R&D. Kodak does not bring anything really new to the market but may only chip away the profit from the BIG two. If any one of the big two decides to quit, can Kodak take its place? Kodak has neither the expertise in optics nor videos. Without true innovation in the products, how can it compete with SONY? I don't see this as a good thing at all.
I think just the opposite. More members of this lens mount group equals more choice and perceived dominance. The format with its wider aperture lens and IBIS from what I can see is every bit as good as APS. Sony for some odd reason is not designing APS lenses anymore and no one else makes e-mount bodies. Perception is a proprietary mount with little corporate support. The more I think about it, micro four thirds makes more sense to the consumer. Go Kodak! :)