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Use the front thread diameter from the exact lens specification, never the focal length. Canon's RF-S18-45mm is a 49 mm example. Learn the practical verification steps and official source.

Reviewed by LensMatch editorial · 2026-10-30

Use the front thread diameter from the exact lens specification, never the focal length. Canon's RF-S18-45mm is a 49 mm example.

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The decision to make

Use the front thread diameter from the exact lens specification, never the focal length. Canon's RF-S18-45mm is a 49 mm example. Record the camera, lens and any adapter model before interpreting a general rule.

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A reliable check

  1. Match the product code and mount version.
  2. Read the manufacturer’s supported-product or manual page.
  3. Check physical fit, image coverage and shooting functions as different questions.
  4. Keep an unsupported claim distinct from missing information.

Apply it to your gear

Camera and lens checkerExact documented combinationsFilter size checkerThread and ring direction

Official sources and scope

Checked for this reference on October 30, 2026. Product firmware and support lists can change; inspect the current maker page for your exact revision.