Canon RF-S18-45mm F4.5-6.3 IS STM is listed for Canon RF with APS-C coverage. Its verified front filter size is Ø49 mm. Canon specifies automatic APS-C cropping on compatible full-frame EOS R cameras.
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Verified specifications
| Field | Value |
|---|---|
| Mount | Canon RF |
| Image format | APS-C |
| Front filter thread | Ø49 mm |
| Model ID | canon-rf-s18-45mm |
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Look for the Canon RF 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.