We had this discussion. The patent in question was a modification to
the existing K mount to facilitate the use of both old and new weather
sealing rings in the current and future DA lenses. You'll probably be
able to see it in the K7, in that the camera body's mount plate is
slightly larger in diameter, and the outer edge is chamfered to
accommodate the weather sealing band found in the two new "kit"
lenses. It's a flat band, not a round ring like the earlier lenses
have. old O versus new [] in cross section. Camera body mount will
be ____/ vs ____| at it's outer edge. Band will be slightly bend
when in contact with mount, creating pressure at the sealing point by
deflection, while maintaining weather sealing by compression with old
mount plate and sealing rings. Lenses without any weather sealing
component will still seat normally.
Or something like that. :-)
P.S. I just looked at my 17-70 SDM with a magnifier and it's sealing
ring is more like ___/°/ in that the sealing edge is at a 45° angle
to the plane of the lens' mount plate. The 18-250 has no sealing ring
at all, nor does the 31 ltd., but the DA* 200 has the same 45° rubber
as the 17-70 SDM.
On May 27, 2009, at 09:00 , Nick Wright wrote:
Uh oh, watch out!
Anyway.
I seem to recall something recently about a Pentax patent detailing a
lens mount with two bayonets.
And now we have Pentax maybe putting full-frame 35mm digital lenses
back in their roadmap.
So I was thinking, would it be possible that the new Pentax 645 has a
mount that allows you to attach both 645 and 35mm FF lenses without an
adaptor?
And then I thought, the camera could automatically sense which kind of
lens was on the camera. If a 645 lens was attached the sensor was in
"645 mode" but if a 35mm lens was attached then it reduced itself to a
24x35mm frame and appropriate resolution.
Would that be possible? Surely it would be. The better question would
be, is it feasible?
Joseph McAllister
Pentaxian
http://gallery.me.com/jomac
http://web.me.com/jomac/show.me/Blog/Blog.html
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