I have a few similar cameras, such as the two Minox 35's (one which doesn't like fast shutter speeds), a few EOS bodies... it's just handy to keep them loaded with different film. I.e. one EOS is loaded with Kodak Elite Chrome 100 extra color, other has plain Fuji Superia in it, another with Fuji Neopan Acros... it's just easy to pop off the lens, switch it around, then continue shooting with a different type of film.