Screen for Wynne’s Infallible Shutter Speed Tester
Gradated screen for shutter tester by Wynne, patented 1903.
Shutter Tester by Wynne, patented 1903.
Gradated screen for shutter tester by Wynne, patented 1903.
Metronome for Wynne’s Infallible Shutter Speed Tester.