What's the verdict on the quality of ultra-wide focal-range lenses like this, Dirk? I go through the Canon catalogue every so often and ofteh wonder why they have say 105-300, etc lenses while also having 28-250? Surely everyone would go the wider range every time?
I have assumed that the more "extreme" range ones (20-200, 50-500, etc) must be of lower optical quality than a tighter range zoom, figuring that you can't get anyting for nothing and the optics are probably better in the tigher ones.
It will be interesting to hear how you find it, and whether you reckon the quality drops off a bit at the "50" and "500" ends.