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Originally Posted by Keith C
The attempt by Olympus to introduce a new system which in theory should allow smaller bodies & lenses has still not really taken off & it means ditching existing 35mm equipment which naturally many are reluctant to do. Next year it may become more of an open system which allows the interchangeability of lenses from more manufacturers but those already committed to an existing system will tend to stay loyal & also save money by not having to re-equip.
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Although you can use existing 35 mm lenses on dSLR cameras, typically their role will be different: because of the 1.5-1.6x crop factors for most dSLRs (including the 5D and 7D) when compared to a "full-frame" 24 x 36 mm imaging area, the role of these lenses will be shifted toward the telephoto end. You would use a 50 mm lens on a dSLR much as you would use an 80 mm portrait lens on a full-frame camera and so on. The upside is that the system becomes smaller and lighter, especially if you use a lot of telephoto stuff in your shooting. Your 12-inch-long camera would thus become perhaps 8 inches long instead. The smaller format also has some advantages for macros and extreme close-ups. The downside is that a true wideangle is hard to come by.