Cambo Wide 470 with 47mm f5.6 Super-Angulon brand_Schneider-Kreuznach The Freewell magnetic filter system

The Freewell magnetic filter system starts with a slim magnetic filter holder that threads into your lens- in this case

Generic rear lens caps for Leica M-mount lenses

and includes a battery

I bombed out of physics class and ended up here writing descriptions for filters

but the aperture ring itself moves very nicely

Cambo Wide 470 with 47mm f5.6 Super-Angulon brand_Schneider-Kreuznach The Freewell magnetic filter systemThe Cambo Wide 470 is a special purpose 4x5 camera with an ultrawide Schneider Kreuznach Super Angulon 47mm (!!) f5. 6 lens. That's the equivalent of a 14mm lens on a full frame 35mm camera, which is absolutely wild for a 4x5. Focus is by helicoid, using either the focus scale or the groundglass. There's even 24mm of shift on the lensboard, which this lens won't cover on 4x5, but would work great with a 6x9 rollfilm back (not included.) This camera