After a LONG discussion of the merits/demerits oof the Panny 7-14 vs the Oly 9-18, life would be so much simpler (for me) if Sigma made an 8-16mm. They make a great 10-20 APSC (15-35 equiv) for Nikon, Canon etc. The f4-5.6 version costs $429 and the constant f3.5 $649. I had the f4 -5.6 version when I had my Canon 650D and it was a really great lens - AND it took filters which for me, as a seascape photographer was vital. It measures 86x89mm and weighs 520g - compared to the Panny at 70x83 and 300g. Sigma must have sold tons of these lenses - I've seen plenty of them around and am a bit surprised that they haven't developed a lens like this. Assuming they could produce a 8-16 constant f4 with dimensions and weight similar to the Panny for around $500, I would leap at the opportunity! Your thoughts?