#m42

What does "m42" mean?
May_4_2016

m42-0 2607 m42-lens 2009 m42-b18 1191 m42-マウント 48 m42-goonsquad 698 m42-k 46 m42-mount 374 m42-816 87 m42-2 160 m42-0d 84 m42-hostel 159 m42-lenses 131 m42- hostel 133 m42-231 46 m42-232 35 m42-000 289 m42-9810230 1392 m42-1a 48 m42-2a 220 m42-b18is 38