Cosmic and background radiation (as well as fallout from nuclear testing) may also cause the unmodified silver salts to be modified in random-and usually somewhat even-distribution, which reduces the number of available unexposed crystals and introduces noise. Over time, the sensitivity of the silver halides can begin to degrade. What’s important here is understanding that the silver halides are modified by a chemical reaction when exposed to light or other forms of radiation.įilm has expiration dates for several reasons.
#Kodak capture pro dark 20 50 light 20 40 full
To make film, a gelatin paste full of silver salts is smeared onto strips of thin plastic and wound into rolls-pretty much. Not so with film, which uses chemical reactions instead of semiconductors to capture images.
Short of being run over by a truck, a flash card is going to work more or less the same no matter when it was made. Okay, maybe it’s not that bad-there is a lot less to go wrong with a roll of film than a parachute, and a lot less riding on it-hopefully. You don’t know who packed it or what it may have suffered in all the years since then. Using expired film compounds the uncertainty, like jumping from an airplane with a parachute you just bought at an army surplus store. It’s like doing a trust fall every time you release the shutter. Without an LCD screen built into the camera, you have no way to check whether you got the shot-you’ve put your faith in your camera, your skill, and your film. Your shutter might drag or the mirror not swing up correctly. If you’re shooting film already, you know that you need to develop a tolerance for uncertainty.įilm can be fogged, or wrecked in development. Edge issues result from developing contrast and grain are still extremely good despite this film’s 40-plus years. Rated at ASA 50 and exposed 4/2015, developed normally. Kodak Plus-X, ASA 125, expired 1975, storage unknown.
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