Are there any cheaper lenses out there similar to the Zeiss 21mm? I've been reading Galen Rowell's "Inner Game of Outdoor Photography" and he talks about using a small 24mm 2.8 lens on his Nikon when backpacking. What is my best option in the Canon world? I'd like something small, less than $400, that has better image quality than my 17-40mm when stopped down, with a focal length of around 17-24mm. It can be manual focus and does not need to be a fast aperture lens. I was hoping to find something similar to the Samyang 14mm, but a bit less wide. Any ideas? Or am I thinking too much about this and should get the Canon 24mm 2.8? I have not heard much about this lens.