The Kodacolor Exposure Guide is a pocket-sized rotating dial calculator produced by Eastman Kodak to help amateur photographers determine correct shutter speed and aperture combinations under various daylight conditions without a light meter. By aligning lighting conditions on the outer ring with the rotating inner wheel, photographers could read off recommended settings for shutter speed and f-stop. Originally sold for 10 cents, - as marked on the sleeve, - it represents Kodak's ongoing mission to make photography accessible to everyday consumers. A charming analog solution to a problem that today is solved automatically by every camera and smartphone on earth