I've been shooting quite a bit with my adapted rangefinder lenses, in particular one adapted from an old Konica Eye half-frame 35mm camera as well as a Canon 50mm f1.2 rangefinder lens. It got me wondering why the Sony native lenses are so large. So I've decided to share my theories: 1) Sony has released large lenses because it is faster, cheaper, and easier to design them. 2) They are based on Sony Alpha lenses. 3) They don't care; they'd rather sell us a new body each year. 4) Sony is working on next generation lenses: a 30mm pancake and a fast 18-55 compact zoom, and will sell them as upgades when current sales subside. I hope it's "4".