I use the converter to the 14mm prime lens. While I find that 14mm at full aperture comparatively (Oly 9-18mm) sharp, so be the focus with the converter in the entire edge area (not just the corners) but strongly after. The 9-18mm Oly makes it better at 11mm a tad. Since it comes in MFT with minimum weight at maximum image quality, I would like to point out that the converter 50% more than the Pana 14mm weighs verleichbarere size. In the final result, and compared with the Oly 9-18mm size, weight, image quality and price with 22mm-KB're very comparable. I opted for the Combi and 14mm converter and against the Oly 9-18mm, mainly because the weight that Offenblentauglichkeit and the size of 14mm with the PM Oly series (image stabilization) find myself perfectly.