Some landscape images from Parque Nacional da Serro da Cipó, shot on 35mm film.
These were taken using a combination of a dark red filter and a polariser. One disadvantage of using the Leica is that you can not directly see through the lens, and so aligning the polariser for best effect is challenging.
Usually, it seems to be suggested to use a pair of polarising filters so that one can be held in front of the viewfinder and the angle then copied to the other on the lens. Leica even make (an absurdly expensive) polariser that can be mechanically flipped between the viewfinder and main lens. However, for these images I just pointed the polariser at the sky and rotated it until the darkest exposure was found.
All images taken using the Leica M7 with Zeiss Biogon 2/35 and Ilford HP5+.