As others have said, halve the MF FL to get rough approximation of the same angle of view of 35mm. The scene will determine the focal length you need. Personally, I generally carry three lenses when hiking with my GS-1; 50mm, 110mm macro and 200mm. I also have the 250mm, but it is substantially longer and heavier than the 200mm for some reason.
Originally Posted by peter k.