Recent Problems in Canon 75-300mm f/4-5.6 III USM EF Lens

Canon EF 100-300 mm 1: 4.5-5.6 lens
Is there an accessory that doubles the focal length? What are my choices?
Product: Canon 75-300mm f/4-5.6 III USM EF Lens | Posted: 14 years, 3 month(s) ago

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