Originally posted by mecrox ...Being so conservatitve, the Japanese camera companies have probably found it hard to get their heads around this notion...
Ricoh and Sony are both Japanese companies. They follow very different approaches. Ricoh is conservative, methodical, slow.
Sony is more aggressive. Some of their cameras have apps to extend firmware capabilities. That part is good, but their aggressiveness also created a confusing lens mount selection:
There are 4 lens mounts for the Sony alpha series. A-mount is by default full frame, add "DT' to the lens name and it's only APS-C. E-mount is by default APS-C, add "FE" to lens name for full frame. At least that's how I think it works ... it's confusing.