Quote:I added some samples showing the bokeh and flare.
While you can't really expect a nice bokeh from a wide angle lens, the flare handling is worse than average.
The field curvature is also heavier than indicated by the lab tests. I would recommend f/11 to overcome it really.
Obviously you haven't used the Sigma 14mm f/2.8 lens, then.
I will quote Petteri Sulonen (of the long defunct site prime-junta.net) who had been using this lens for awhile, nicknaming it Twinkles... for a good reason.
The Frogster (as I would nickname this 12mm unit) looks tame in comparison, and overall it's something we have to live with when shooting wideangles.
Quote: The bad news is that Twinkles twinkles. I've never used a lens anywhere near as prone to producing flare spots. If the sun is in the frame or near it, you'll get a nice row of flare spots of various brightnesses and colors, guaranteed. Even moderately dim light sources, such as an ordinary lamp, can cause the same effect. Sometimes this looks kinda cool and can actually be put to creative use, but most of the time it's a significant annoyance -- in fact, the only concern of note I have with the lens.
