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Takumar 50mm f1.4 is one of the very best vintage lenses. Here's a review of the four M42 versions.
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Ultimate Guide to Camera Lenses — Every Type of Camera Lens Explained [Shot List Ep. 7]
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Super-Takumar 50mm f1.4. Is the famous 8 elements lens measurably better than the 7 elements lens?
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