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Why do I dislike the Four Thirds system, you ask?
Well, okay, you didn't ask, but I want to procrastinate a bit more before I go to work.
The idea was to make a whole new system specifically for digitals, without the 35mm legacy. They used a sensor that's half the standard 35mm frame (so 2x crop factor), which lets them have smaller bodies and smaller flange-focal distance because they don't use a mount that was designed to accomodate big 35mm-format lenses.
However, once you get to the SLR form factor, you can't really make it all that smaller. So a camera at a given price point will weigh a little less than the competing camera from Canon or Nikon, but not really enough to justify the downsides: 1. Quality of a Four Thirds camera will always be a little worse than the equivalent 1.5x or 1.6x crop camera, because the smaller sensor means smaller pixels means more noise. 2. No upgrade path. If you're shooting Canon, you can go full frame and buy a 5D or a 1Ds if you need better image quality. If you shoot Four Thirds and want full-frame image quality, you get to change systems and buy a full new set of lenses. This'll be especially noticeable if technology increases to the point where it's suddenly reasonably cheap to make full-frame sensors--Canon, Nikon, Sony, and Pentax could then put full-frame sensors in all of their cameras, while the Four Thirds guys will be stuck shooting half frame.
Four Thirds is the APS of digital.
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