I recently got extremely lucky and picked up a Pentax 67 with the 105/2.4 lens in great condition. Someone at work was offloading most of their old film gear, so I was able to pick it up for $100. While the 105/2.4 lens is very nice. I'm interested in possibly picking up something wider as well. In 35mm, I'm more of a 28mm shooter, but also use 20, 24 and 35mm lenses. What's a good wider angle lens for 67 - maybe the 75mm f/4?