Actually, silver isn't an on-or-off thing. It can be partially "on". That's the analog part. In truly digital media, on and off are the only possibilities; somewhere in between is impossible. (In aggregate, an effectively in-between response is of course possible, but any individual pixel is either on or off.)
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Jim MacKenzie - Regina, Saskatchewan, Canada
I have GAS and I'm proud of it!
Nikon FE (x2), FM2n, F3HP, F70, N8008s, F90x, F100, F4s, F5
Fed 2b, 3a, 3b, 5c
Zorki 4, 4K
Kiev 4a
Olympus Stylus Epic (aka MJU II)
Yashica Electro 35 G
Bronica SQ-A
Minolta Autocord CDS II
Calumet CC404
Graflex Pacemaker Speed Graphic
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