David, This question ended up in the digital cameras section, but I think you are not talking about cameras or camera lenses, you want to do some calculations on lenses, but what kind of lens. Or when I'm wrong, please correct me. And can you add a picture with your question?
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David, This question ended up in the digital cameras section, but I think you are not talking about cameras or camera lenses, you want to do some calculations on lenses, but what kind of lens. Or when I'm wrong, please correct me. And can you add a picture with your question?
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