Canon EF 50mm f/1.8 STM is listed for Canon EF with Full frame coverage. Its verified front filter size is Ø49 mm. An EF lens; an EOS R body needs the EF-EOS R mount adapter.
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Verified specifications
| Field | Value |
|---|---|
| Mount | Canon EF |
| Image format | Full frame |
| Front filter thread | Ø49 mm |
| Model ID | canon-ef50mm-f18-stm |
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Look for the Canon EF designation on the camera specification, then verify the exact model code and mount variant against its support page. A physical mount match is a starting point; still AF, movie AF, crop behavior, stabilization and firmware need separate checks.
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A circular screw-in filter with a matching documented thread size is only a mechanical candidate. Magnetic filters, wide frames and stacked rings need separate system and vignetting checks. When no front thread is specified, do not buy a size from the focal length or barrel diameter.
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Checked for this reference on October 30, 2026. Product firmware and support lists can change; inspect the current maker page for your exact revision.