Lightroom has a rather splendid feature, allowing one to filter and count one's photographs by all sorts of criteria, including lenses used. This allows one to perform interesting analysis of one's pattern of lens usage over time. When I ran this tool on my own Lightroom catalogue, I found the following (limited to photographs taken with the E-P3, which I acquired in November 2011): 2011 Total (flagged): 5,279 (8) Olympus 14-42mm: 3,279 (3) Manual lenses: 2,000 (5) 2012 Total (flagged): 5,370 (778) Panasonic/Leica 25mm f/1.4: 1,626 (132) Panasonic 14mm f/2.5: 1,505 (112) Olympus 12mm f/2.0: 775 (234) Olympus 14-42mm: 576 (109) Olympus 45mm f/1.8: 619 (104) Manual lenses: 653 (87) 2013 to date Total (flagged): 3,932 (949) Panasonic/Leica 25mm f/1.4: 1,068 (204) Panasonic 14mm f/2.5: 619 (196) Olympus 12mm f/2.0: 533 (208) Olympus 14-42mm: 2 (0) Olympus 45mm f/1.8: 496 (75) Olympus 60mm macro f/2.8: 953 (213) Manual lenses: 261 (53) One or two notes: I acquired the 14mm, 12mm and 25mm lenses around the same time in March 2012, and the 45mm lens shortly afterwards in April. I had previously made (fairly) extensive use of 24mm and 50mm manual lenses. In December 2012, I acquired the Samyang 7.5mm fisheye (which shows as a manual lens), and in February 2013, the Olympus 60mm macro lens. The only other manual lens that I use now is an old Pentax 135mm f/3.5, although I do not use that very often. The number of rejects for the 45mm lens (i.e., those not flagged in proportion to the total) is inflated somewhat by the fact that I use this lens to take portraits of people for our website at work, which involves taking a large number of photographs and choosing only one. Before I acquired the 45mm lens, I had used a 50mm manual lens. The lack of use of the 14-42mm lens in 2013 is evident; after being disappointed with the photographs that it produced on a holiday in 2012, I stopped using it, and it now no longer resides in my camera bag at all, sitting instead in a drawer (I keep it as it might be useful if I ever do video). The particular delight that I take in macro is evident from the numbers, as is the extent to which macro photography is technically challenging, as can be seen from the higher number of rejects (mainly due to the subject being out of focus). As for the two Panasonic lenses, before I acquired the macro lens, I regarded the 25mm f/1.4 as my favourite lens, and I often take it and the 14mm lens (but no others) to parties; but I do find that it has trouble focussing in low light, which might account for the higher reject rate for that lens. I should be very interested to see other people's lens use statistics over time and what conclusions that people draw from them. The same applies to camera bodies for those who use more than one: I only have the E-P3 aside from the camera in my mobile telephone, so that does not apply to me. Edit: I think that the 2011 absolute figures are artificially inflated by the catalogue containing multiple copies of the same image, as I was not using Lightroom at the time.