this post was submitted on 16 May 2024
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I assume the lenses were intended to allow the Apollo missions to photograph the literal dark side of the moon, i.e., the side not lit by the sun while the capsule was passing over it, since they couldn't wait half a month for it to get well lit and making the lenses was almost certainly cheaper than launching more capsules to make sure they covered every bit. 🤷♂️
Whatever the case, they were very “fast” lenses (that is, they had a very large relative aperture), which allowed cameras using them to get good pictures under very poor lighting conditions, like a big black rock lit by starlight or some XVIII century crooks lit by candlelight.