Steve,

No matter whether there is a mirror in it or not, the camera will be  
at least as thick as a Pentax ME to mount a K-mount lens, which  
requires an ~45mm mount register. And the lenses are bulkier than they  
would be if the mount register were less as a consequence.

The advantage of microFT is that the mount register is only 20mm vs  
40mm so lenses built for microFT will be substantially smaller and  
lighter than lenses built for FT, even though the sensor format is the  
same. For instance, since the normal for FT is a 25mm lens, you can  
build a symmetrical design 25mm f/1.4 which will be FAR smaller than  
the inverted-telephoto design required for the SLR mount. A 21mm f/2  
lens could be the same size or smaller than the DA21.

An L1 body (which is a mostly rectangular box) with the FT mount  
register is 5.03 cm (1.98 inches) thick at the mount. A microFT L1  
body could be 1.1 inches thick ... thinner than a Leica M.

Godfrey

On Aug 10, 2008, at 1:49 PM, Steve Desjardins wrote:

> "Slim" might be the wrong word.  Small?  Light?  It doesn't have to  
> fit
> in my pocket, but I'd be curious how small a camera you could build
> around a K mount  lens.

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