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The Isolette is a compact horizontal-folding camera for twelve 6×6 cm (2¼-inch square) pictures (or sixteen 4.5×6 cm (2¼×1⅝ inch) pictures, with the first model of the camera) on 120 film. It was made by Agfa Kamerawerk AG, Munich, Germany, from 1937, and the series of cameras continued until about 1960. The Isolette II (1950-60) was sold alongside the 'I'; it is an alternative model offering higher specification than the 'I', not a successor to it. The camera was available (for at least some time) with coated 85 mm f/4.5 Agnar or Apotar or 75 mm f/3.5 Solinar lenses however, most examples seen have the Apotar. There are a very wide range of shutters (Vario, Pronto, Prontor-S and SV, Compur Rapid and Synchro-Compur). This reflects changes in the specification over the period the camera was made (i.e. not all of these shutters were available at the same time): for example, a user's manual (of unknown date) only lists the Pronto and Prontor SVS. The range of shutter speeds is therefore variable between examples. Some of the shutters have a delayed action. Most are synchronised (some have switchable M and X-synchronisation). On some examples of the camera, there is a shutter locking lever on the back of the top housing, to provide 'T' shutter by locking the release button down, where the shutter itself does not have a 'T' setting.Unlike the Isolette I and all the preceding models, the film advance knob is on the right. The camera still has a swing-out spool-holder on the supply side of the film chamber.