Why doesn't a 58mm diameter filter fit on EF 50mm f/1.4? - Photography Stack Exchange
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What is the diameter of Canon 50mm f1.8 STM?: Beginners Questions Forum: Digital Photography Review
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Camera Lens UV Protection Filter 49mm for Canon EF 50mm f/1.8 STM & for Sony E mount 18 55mm f/3.5 5.6 OSS Lens|filter 49mm|protection filterlens uv - AliExpress
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Which filter size should I buy to fit a 50mm lens? - Quora