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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【RAREEXC+++++】Leica Leitz III Black Rangefinder W/Nickel Elmar 50mm F/3.5 #112 picture
【RAREEXC+++++】Leica Leitz III Black Rangefinder W/Nickel Elmar 50mm F/3.5 #112
LENS  LEITZ NICKEL ELMAR   50mm  f/3,5, LTM mount ,  NO SERIAL NUMBER picture
LENS LEITZ NICKEL ELMAR 50mm f/3,5, LTM mount , NO SERIAL NUMBER
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Leica III Model F + 50mm Nickel Elmar
Contax I black nickel SN.Z26575 Lens Tessar 3/50 SN. 1553314 picture
Contax I black nickel SN.Z26575 Lens Tessar 3/50 SN. 1553314
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Contax I black nickel SN.Z69000 1935