the term 0.5x let me assume that the focal length is halved. On my Panasonic SD 909 with a focal length of 35 mm, I assumed that I would come to approximately 17mm wide angle. RMS can be reached by WW intent a focal length of about 24 mm, which is sufficient for most cases. Praiseworthy is the optical quality of WW intent, no distortion or distortion and a very good optical quality. One should mention also that in the extreme setting to 24 mm a slight vignetting occurs. The macro-properties are also 1A. All in all, a top quality for less money.