I see this has been mentioned in some posts, but I thought it might bear repetition. You can read this: http://labsdownload.adobe.com/pub/labs/lightroomplugins/lightroomplugins_dngre_docs.pdf But I'll summarize. If you have certain cameras (Olympus for sure, but not Panasonic or Nikon) and you deliberately shoot in a cropped mode like 16:9 or 1:1 while shooting RAW, the resulting RAW will contain crop info and Lightroom will respect that. However, if you convert to DNG from RAW (and you must to use this), you have the option to recover the original sensor image sans cropping using this plug in. This is possible because the RAW file still contains all the original sensor data from the entire sensor. If you've ever shot something using a special crop, and then later wished you had not, you can recover all the sensor data with some model cameras which includes most Olympus mu-43 cams.