Best standard prime lenses for the Canon EOS R100

Canon EOS R100 · 2023 · 24.1 MP APS-C · 356 g · no IBIS — stabilisation is lens-only

6 standard prime lenses that fit the Canon EOS R100 (Canon RF mount) — the natural field of view — first prime territory. Sorted brightest-aperture first; every spec from the manufacturer's catalog.

Start with the Canon RF 50mm f/1.2 L USM. At f/1.2 it is the brightest of the 6 standard prime Canon RF lenses that fit the Canon EOS R100 — the full comparison is below.

It is a full-frame lens. It fits and shoots at full resolution, and the glass often carries over if you move to a full-frame body later — but for the same framing it is larger, heavier and dearer than a lens built for this sensor. The brightest APS-C option here is Sigma 30mm f/1.4 DC DN Contemporary at f/1.4.

Last verified 2026-09-01 · Canon RF mount · Canon APS-C body · 1.6× crop factor

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Focal	Lens	Buy	Max aperture	Weight	Filter	Type	Coverage	Best for
50mm	Canon RF 50mm f/1.2 L USM	Check price →	f/1.2	950 g	77mm	prime	Full-frame	PortraitLow-lightWedding & eventStandard prime
30mm	Sigma 30mm f/1.4 DC DN Contemporary	Check price →	f/1.4	285 g	—	prime	APS-C	Standard primeEverydayLow-light
50mm	Canon RF 50mm f/1.4 L VCM	Check price →	f/1.4	580 g	67mm	prime	Full-frame	PortraitLow-lightStandard primeWedding & event
17-40mm	Sigma 17-40mm f/1.8 DC Art	Check price →	f/1.8	560 g	67mm	zoom	APS-C	EverydayStandard primeLow-lightPro standard zoom
50mm	Canon RF 50mm f/1.8 STM	Check price →	f/1.8	160 g	43mm	prime	Full-frame	Standard primeBudgetLow-light
24-50mm	Canon RF 24-50mm f/4.5-6.3 IS STM	Check price →	f/4.5-6.3	210 g	58mm	zoom	Full-frame	Standard primeEverydayCompactBudget

One limit of this table: it lists only Canon RF lenses that mount natively on the Canon EOS R100 — lenses fitted through an adapter are not included here. See which mounts adapt to which.

What these focal lengths actually give you on the Canon EOS R100

The Canon EOS R100 has an APS-C sensor, so it sees a 1.6× crop of what each lens projects (Canon's APS-C is 1.6×, not the 1.5× used by Sony, Nikon and Fujifilm). Every focal length below therefore frames 1.6× tighter than its marked number. A 50mm on the Canon EOS R100 frames like 80mm, not the "normal" view its marked number implies.

Effective focal lengths are the marked focal length × the 1.6× sensor crop factor — the field of view, not a change in the lens itself. Aperture and depth of field are unaffected.

Weight & weather sealing on the Canon EOS R100

On long approaches the decision is often made by weight, not aperture. Manufacturer-published weights for 6 of the 6 lenses above:

Packing light? The lightest here is the Canon RF 50mm f/1.8 STM at 160g. The lightest weather-sealed option is the Sigma 17-40mm f/1.8 DC Art at 560g.

Weights and sealing from each manufacturer's published spec sheet (per-lens source recorded in the dataset) · methodology

FAQ

What is the best standard prime lens for the Canon EOS R100?
Canon RF 50mm f/1.2 L USM (50mm f/1.2) is the standout standard prime option that fits the Canon EOS R100. 6 standard prime Canon RF lenses fit in total — compare them below.

Do these standard prime lenses fit the Canon EOS R100?
Yes — every lens here is a Canon RF mount lens, so it fits the Canon EOS R100 and covers its APS-C sensor.

What is the lightest standard prime lens for the Canon EOS R100?
The Canon RF 50mm f/1.8 STM at 160g (manufacturer-published weight). The lightest weather-sealed option is the Sigma 17-40mm f/1.8 DC Art at 560g. Weights for 6 of the 6 lenses on this page are in the weight table above.

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All lenses for the Canon EOS R100 · the same use across mounts: Standard prime lenses for Canon RF · all cameras

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