ISO

An ISO number rating refers to the speed of the chosen film. A lower ISO film, such as 100 speed film, will require more light. A higher ISO film, such as 400 speed film, will require less light, but produce grainier negatives. The higher the ISO, the less light required. Typically, lower speed films are used for portraits, whereas higher speed films are used in lower light settings or in sports photography where one wishes to stop action.

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voigtlander Prominent Camera w Ultron F/ 1:2/50 Lens with case picture
voigtlander Prominent Camera w Ultron F/ 1:2/50 Lens with case
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VOIGTLANDER 310/47 Metal LENS HOOD PROMINENT NOKTON ULTRON + FILTER 302/47
Voigtlander Prominent 35mm Rangefinder Camera w/ Ultron 1:2/50 Lens & UV Filter picture
Voigtlander Prominent 35mm Rangefinder Camera w/ Ultron 1:2/50 Lens & UV Filter
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Voigtlander Prominent Vintage 35MM Film Rangefinder w/ 50MM F2 Ultron Lens
Voigtlander Prominent camera w/ f2/50 Ultron, case, box, lens cert. Exc. picture
Voigtlander Prominent camera w/ f2/50 Ultron, case, box, lens cert. Exc.