In 1948 I was in the RAF, and this shot of one of the other engine fiters in my flight working on a Spitfire propellor was taken one day as we started work again after lunch. It was taken by natural light from the open hangar doors. The camera was a Nagel Ranca from 1930 with an f/4.5 Nagel Anastigmat (possibly made by Schneider), in an Ibsor dial-set shutter. It took 16 pictures on 127 film. I don't remember what the shutter speed or stop was, and focusing was by guesstimation. The film was one of several I cut down in the station's Photographic Section darkroom from end-of-reel lengths of RAF film from reconaissance cameras and wound into 127 backing paper. It was fairly thick base and I sometimes had problems getting it to lie flat in the camera, but most of the time it perfromed quite well. It was also developed in the Section's darkroom by hanging in a deep tank of brown evil-smelling brew which if I recall correctly was either Pyro-Soda or Meritol-caustic. The corporal in the darkroom suggested giving it about six and half minutes, and whatever it was it developd the film OK.