Lens thread on DPM?

I was under the impression that both DPM cameras had a 49 mm lens thread.

When looking at specs, I can find no such info.

http://www.sigmaphoto.com/shop/dp1-merrill-compact-digital-camera
http://www.sigmaphoto.com/shop/dp2-merrill-compact-digital-camera

Anyone?

AS a side question. Does the rear of the lens move while focussing? Or is it an inner focusing lens?

--
Roland

X3F tools:
http://www.proxel.se/x3f.html
https://github.com/rolkar/x3f