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Unidentified photographer/creator
Autochrome filter
n.d.
Private collection of Mark Jacobs
© Collection Mark Jacobs
LL/9113
It was necessary to place a special yellow-orange filter over the picture taking lens. Autochromes were much more sensitive to blue than to daylight so the filter acted to balance the color. However, the filter increased exposure.
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LuminousLint 
@LuminousLint