Buried deep in the options on the small screen is an electronic shimming adjustment. Has anyone used this, or have any documentation on it? Doesn't seem to be in the manuals, perhaps it was a later firmware addition.. Is it for adjusting the back to the camera, or a correction for each lens on the camera? Any ideas on how it works - do you just adjust it and see if the alignment makes a difference? Cool feature, would like to know more. Thanks!