Just got myself a second hand Olympus 45mm f1.8 lens from E-Bay and it is my first Olympus prime lens. I did think about getting the 17mm f1.8 or the 25mm f1.8 but I already have the TT Artisans 17mm f1.4 and a 25mm f1.8 both being manual focus of course. What surprised me the most about the 45mm was just how small and light it is.