Canon RF-S55-210mm F5-7.1 IS STM — Canon RF mount and filter size

Canon RF-S55-210mm F5-7.1 IS STM is listed for Canon RF with APS-C coverage. Its verified front filter size is Ø55 mm. The supplied research links this exact mount variant to manufacturer evidence. Body-specific AF, crop and adapter behavior remain separate checks.

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Verified specifications

Field	Value
Mount	Canon RF
Image format	APS-C
Front filter thread	Ø55 mm
Model ID	canon-rf-s55-210mm-f5-7-1-is-stm-canon-rf
Focal length	55–210 mm
Maximum aperture	f/5–7.1
Filter attachment type	screw_in
Weight	9.5 oz (approx.; 270 g maker value)
Length	3.66 in (approx.; 92.9 mm maker value)
Maximum barrel diameter	69 mm
Closest focus	2.40 ft (approx.; 0.73 m maker value)
Maximum magnification	0.28×; see maker conditions below
Lens AF hardware	Maker states yes
Optical stabilization	Maker states yes

The reported maximum magnification is conditional: 0.28x (f=210mm) 0.05x (f=55mm). Do not substitute a 35 mm-equivalent figure or a teleconverter configuration for the bare-lens value.

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Compare the exact model code and rear mount in each listing. Amazon results may contain another mount or generation; the search is not a compatibility verdict.

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Choosing a camera

Look for the Canon RF designation on the camera specification, then verify the exact model code and mount variant against its support page. The maker lists a 55–210 mm focal range and f/5–7.1 maximum aperture. A physical mount match is a starting point; still AF, movie AF, crop behavior, stabilization and firmware need separate checks.

Choosing a filter

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.

Ø55 mm filter guideRing direction and sample lenses

Hoods, caps and other maker-listed parts

“Supplied” describes the maker’s package statement for this exact lens record. A merely related part may be sold separately, and neither label establishes cross-generation interchangeability.

Part code	Maker label	Relationship
Lens Dust Cap RF	Lens Dust Cap RF	Maker lists as related; inclusion not established
Lens Cap E-55	Lens Cap E-55	Maker lists as related; inclusion not established
ET-60B	ET-60B	Maker lists as related; inclusion not established
LP1016	LP1016	Maker lists as related; inclusion not established

Keep exploring

Check filter fitChoose exact lens and filter diameter

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.