my old handheld General Electric Exposure Meter Type PR-1, circa 1951. It still works perfectly, although it doesn’t do well in very low light situations.
It’s really just a slide ruler built around a light meter. You can set different ASA values (or frames per second if shooting (video) film)), then look up corresponding values for aperture and shutter speed to set the camera for proper exposure. It often does a better job of picking exposure combinations than the exposure meter built into my 60-year-newer Canon XT.
2009/12/29: The contrast between an object and its shadow can make for an interesting photo. Explore the “dark side” of shadows today. #ds44