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by snakes in the grass
From snakes in the grass

[Private Henry McCollum of Company B, 78th Pennsylvania Infantry Regiment and three unidentified soldiers in 78th Pennsylvania Infantry uniforms at Point Lookout, Tennessee] (LOC) by The Library of Congress
From The Library of Congress

DSC_0429 estimated exposure for a different camera, at f3.5(wide open on YashicaMat?), 3 - 3.5 second exposure @ iso64 - comparing to a medium format photo of similar composition. Exposure Value for scene with adequate midtones about 5. A calculated guess by scottsfstop
From scottsfstop

The Glaciers of the Alps by Stuck in Customs
From Stuck in Customs