Here you can find a number of full-size test shots made with the new Panasonic X 45-175mm. Click on the picture shown right and choose "O" for original size at the top and "Show Details" -> "Info" for technical data. All shots are taken with a GH2 on a tripod with OIS switched off. Lighting varies a bit, this is due to the constantly changing weather. The raw files were processed in Adobe Camera Raw with my default settings and converted to jpeg in Photoshop. From past experience I know that I'll need months of use to really know if I like a certain lens or not. For now this lens doesn't seem too bad: I'm neither floored nor disappointed by its IQ. It's a pity that my sample is somewhat unsharp at the far right border; I'll have to keep that in mind in critical situations and allow room in the picture for cropping at the right. At 45mm it needs to be stopped down to f/5.6 for optimum IQ, f/4 is just a little bit soft. At 100mm and above it's fine wide open, so that in practice I'll probably set the aperture at f/5.6 and forget about it. The following is largely copied from an earlier post that didn't seem to attract much attention. I was a bit surprised to find out that the zoom ring actually operates the internal zoom motor(s). Nevertheless I have no issues with it, other than that I cannot see at what focal length the lens has been set: no scale anywhere, and there's no new firmware yet for neither the GH2 nor G1 showing the focal length in the finder or screen. The rocker buttons for zooming don't suit me, I expected as much. When taking stills, the buttons offer two zooming speeds. When slightly pushed, it zooms slowly and pushed further it goes faster. There's no OIS switch, OIS mode has to be set in the camera's Quick Menu. This lens feels very light and comfortable on the camera, the combo handles great, you don't have the idea that you're working with a long zoom lens at all. The 45-200mm is much clunkier and heavier. Focussing seems quick and positive, I didn't see any hunting. It takes somewhat more time with dark subjects when I cover up the focus-assist light and it sometimes plainly isn't able to focus. Overall focussing seems much quicker and more assured than that of the 45-200mm. I'm happy that Panasonic came forth with this lens. I'm OK with primes, but I need a zoom in the 50-150mm range because often I find myself unable to foot-zoom when using those focal lengths. There's mostly something in the way, like other people, a fence, a ditch or a valley. That's the main reason I didn't go for the Oly 45mm. I'll probably buy the 35-100mm as well if it's any good. Having said that, I'll probably continue to use my Minolta legacy 50mm and 100mm lenses for situations where I have the time to go for optimum results.