I have several old primes that I like to use in low light situations. With an old prime lens, the camera is set for 'shoot without lens' and no lens information is recorded in the metadata. This creates some problems as I like to know which lens I have been using and what f-number so that I can evaluate the lens' performance in different situations. The camera has a feature for entering text, but I have never used it. If anyone has used this feature, is it worth using or too bothersome to set up? Where does the information go in the metadata? Will the field auto-fill? It may be to awkward to record every f-number change, but perhaps it would be worthwhile to at least record the lens model and f range used.