For the majority of the pictures above i used an old Japanese Hanimex 28mm f2.8... i also use A Helios 58mm f2... If you're looking for a good 30mm, i suggest looking at the 35mm CCTV lens, APS-C... i got one a few weeks ago, very versatile little lens... A simple C Mount adaptor to your camera body will sort it.
RE: Nature through old M42 lenses on a Fuji X E1