I often backpack in the mountains and sometimes carry my Pentax 67II with wide angle lens (either the 55mm or more usually 75mm) as I love the 6x7 format. Love this camera but it's heavy for mountain trips.

I'm looking for suggestions for the most lightweight 6x7 as possible with wide-angle lens. I think folders are out, as they look difficult to use with my Lee Grad Filters...

Any ideas?