There is some chatter about the effect of the distortion correction for the RX100 in LR4, causing the corners to degrade. I had a look at my files in LR and could see that corner resolution is below that of the centre (nothing special there of course). As I understand it, the correction is made as soon as the conversion happens? For what it's worth ladies and gents, I did a quick check comparing the TIFF conversion in the RAW Converter that 'comes' with the camera, and LR4. Using the same picture (obviously) I could see no discernable difference (none actually). so, does the RAW converter also do distortion correction automatically? Or is the correction in LR4 so subtle you cant see it? As far as corner resolution is concerned, well, thats probably something to live with. however, if anyone could share their insights into the optimum aperture to get sharpness across the frame that may be useful for the good people who frequent this place. for what it's worth the shot I did the comparison with was at f5, widest angle, 1/250. going to have a close up lens / close up filter delivered tomorrow. shall share my findings on the macro front.