Roger Cicala: Understanding field curvature for fun and profit

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When deciding which 35mm lens to buy, what do you want to know? How sharp it is? How it handles? How much it costs? I want to know what its field curvature looks like. (Spoiler: the plot on the right is from the little guy.) Iā€™m not a fan of lens testing purely for the purpose of winning pissing contests. I am, however, a great fan of lens testing for learning how to best use a lens. There are a few tests I find particularly useful, and the single most important one is field...


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