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This film container denotes its speed as ISO 100/21°, including both arithmetic (100 ASA) and logarithmic (21 DIN) components. The second is often dro
This film container denotes its speed as ISO 100/21°, including both arithmetic (100 ASA) and logarithmic (21 DIN) components. The second is often dropped, making (e.g.) "ISO 100" effectively equivalent to the older ASA speed. (As is common, the "100" in the film name alludes to its ISO rating.)
A box of Agfacolor Neu with the instruction "expose as 15/10° DIN" (in German).
A box of Agfacolor Neu with the instruction "expose as 15/10° DIN" (in German).
Weston Model 650 light meter from about 1935
Weston Model 650 light meter from about 1935
Early Weston Master light meter 1935-1945
Early Weston Master light meter 1935-1945
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Undeveloped 35 mm film roll
Undeveloped 35 mm film roll
A roll of 400 speed Kodak 35 mm film
A roll of 400 speed Kodak 35 mm film
A Polaroid instant photograph
A Polaroid instant photograph
135 Film Cartridge with DX barcode (top) and DX CAS code on the black and white grid below the barcode. The CAS code shows the ISO, number of exposure
135 Film Cartridge with DX barcode (top) and DX CAS code on the black and white grid below the barcode. The CAS code shows the ISO, number of exposures, exposure latitude (+3/−1 for print film).