Matt BlazeWho needs a light meter or a histogram? Behold the Posographe, an insanely beautiful 1922 mechanical computer for calculating exposure time based on aperture, time of day, sky conditions, and other variables.
French lessons not included.
Basically: you move the six sliders along the edges to correspond to your aperture and shooting conditions. That moves the exposure slider (which you don’t touch) to the correct shutter speed. There’s an absurdly complex system of internal levers that somehow doesn’t disturb anything other than the exposure slider when you adjust each input.
You can read more about it at https://www.nzeldes.com/HOC/Posographe.htm
I found mine on ebay a while back.
gladiola@mattblaze This is awesome. Thanks for posting this. I've had a Kodak book of cardboard wheels for about 30 years. I cannot imagine the maximum nerding that would have occurred if I had seen this earlier in life.
@gladiola I remember that book!