>Interesting that this one has no optical finder, similar to many
>digital P&S. I have been led to believe that the large DSLR sensors
>cannot be used for previewing, and this is why DSLRs have to use the
>penta-mirror for framing. Is this no longer true? If so, then why not
>getting rid of the SLR mirror mechanism and make them cheaper,
Probably.
> faster
You mean slower, the shutter lag on P&S is far worse than DSLR.
Remember, you have to expose the sensor to provide a "live" delayed
image, you then have to cap the sensor, flush it, and uncap it before
you can make the exposure.
>and quieter,
Undoubtedly.
>but still have interchangeable lenses ?
I would like an APS-C range finder with an almost silent leaf shutter
and a wide lens; this Sigma could almost meet the requirements depending
on mechanical noise. Oh and it would have to be free from the well
established Sigma/Foveon artefacts.

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Ian G8ILZ