Two of the ‘must-have’ bargain lenses for the Canon 5D Mark II and Panasonic GH1 are in the 35mm range. The GH1 needs a good fast portrait lens around the 35mm mark because the Lumix pancake is a bit too wide at 20mm, and a 50 is too much like a telephoto. 35mm is the perfect compromise and gives you shallower depth of field than the pancake for half the…