最終更新日：2022/12/24
When a lense is described as of 4 inch focus, it means that such a lens is capable of bringing parallel rays to a point at a distance of 4 inches from the lens.
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When a lense is described as of 4 inch focus, it means that such a lens is capable of bringing parallel rays to a point at a distance of 4 inches from the lens.
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