I recently made the switch from a Canon DSLR to an Olympus PEN with the biggest driver being the want for a smaller form factor and with spending less on lenses (no red rings?) being a close second. Since a large majority of shots seemed to be with my 24-70 and 50mm, at least I knew what to find in order to replicate my comfort zone in regards to focal length. I was able to sell one Canon L lens to fund my EPL7, a 12-40/2.8, and the 25/1.8 prime. So right out of the gate I have that span covered. Then I broke it down even further and saw that most of my shots with the Canon 24-70 were taken around 24mm - so that led me to pick up the 12/2 prime. I took the new camera out this weekend camping for 3 days and it seems like the two prime lens were perfect! The 12-40/2.8 didn't even come out of the bag. But it got me wondering if the reason most of my previous shots with the Canon 24-70 were only taken at 24mm because that was the widest point or if it is because I really liked that length. Hmm. So here I am, wondering if maybe I'd want something even wider for my nature shooting. What are the most common options? Is there a wider/rectilinear lens out there? The 9mm fish eye doesn't seem like the answer...? I'm partial to a prime lens since that keeps the small form factor going but am open to any suggestion.