The K10D, and the K20D, uses an internal construction that is similar to the *ist D (full metal chassi with an exterior of polycarbonete). This is good and strong. Now, the K10D and K20D enhances this with weather sealing, which protects the camera even more. This means that both the K10D and K20D is built to stand tougher environments than the *ist DS is.
And then what the makers calls..
You mean that if Pentax would call the K200D a pro-camera, then it would automatically be one? And if a maker releases a follow up to a semi-pro and calls it "avanced amateur" and sells the follow up to a higher price, then the camera - previous known as "semi pro" now is "advanced amateur".
And if Canon suddenly would call the Canon 1DS "entry level beginner model" then it would no longer be a pro model.
Ah, I think I get it now...
Those are silly things...
So what you actually want is not really about cameras specifications, but what Pentax actually calls the camera.
The K200D is called "popular class". Funny, last year it was called "entry level".
Market segments changes their names when the market evolves.
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Take care
R
http://www.flickr.com/photos/raphaelmabo