Linhoff style 40mm extension lens boards.
thingiverse
The Linhoff style 4x5 film holder offers an extension of nearly two inches when fitted with a standard Copal No. 0 lens and adapter, extending focal length to roughly fifty-six millimeters on a bellows. This particular combination pairs the standard issue Kodak #2 view camera, built in Germany during the late 1930s.
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