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Cathan‘s Reflector and Lense
n.d.
Packaging
Archives of Modern Conflict OR National Gallery of Canada
LL/9736
"Is used by taking off the focus wheel, then the tube out of the band, and put the socket of the reflector into the band as evenly as possible and draw the ground glass back until you get a focus.
Time of exposure in sun light, from 40 to 90 seconds."
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LuminousLint 
@LuminousLint