Like many of you, I'm in a quest for a relatively fast rectilinear UWA lens for the m43 system. Something wider than 12mm. My wants are specifically for landscape and night landscape photography. There are certain characteristics that seem unavoidable. Distortion for example. Vignetting too. Many of these characteristics can be corrected during post processing, sometimes automatically if it's a native lens. I'm thinking more in terms of adapted/ non electronic native lenses (Voigtlander for example) - basically a lens that the camera (E-M1 in my case) doesn't communicate with. Here are the main characteristics that Lenstip uses to review a lens: Image resolution (center and edge sharpness) Chromatic and spherical aberration Distortion Coma Vignetting Flaring If you were looking for a rectilinear UWA lens, performance in which of the above characteristics are most important to you? Put another way, which of the negative characteristics can be corrected easily in post processing without too much of a price to pay? For example, distortion can probably be fixed without too much of a penalty. That would imply distortion would fall towards the bottom of your list if you could just check a box in LR and have it corrected. Anybody care to share your thoughts?