Tonight I was taking some pictures with my d40x, 55-200mm VR lense, and various filters (PL, FLD and UV filters). I ended up getting a dual-picture with the FLD filter that turned out nifty. The question I have, is I kept getting the errors I mentioned above. I have been able to sort out that the r04 is an auto-focus problem, but still haven't been able to find what the r07 message is. One reasoning I have seen is: "First the r07 this is not an error code this is how many shots are left in the buffer." If this is the case, then it is irrelevant to the issue and doesn't help to diagnose the problem at all. Other indications from the times that I was unable to take a picture: the dot on the far left would be flashing, then three dots in the sideways bracket, then "60 f 5.6 [r07]" If I tried turning off the camera, then turning it back on, it would be hit and miss whether it would take the picture. If the above thought of r04 meaning auto-focus is the reason why it is messing up, should I try doing some moon shots with it switched to manual focus?