Canon RF-S 18-45mm F4.5-6.3 IS STM Specs & DoF

18–45 mm

Focal length

f/4.5–6.3

Maximum aperture

76°–35°

Diagonal angle of view (APS-C)

APS-C

Designed for

2.5×

Zoom ratio

Specifications#

Brand: Canon
Model: RF-S 18-45mm F4.5-6.3 IS STM
Lens type: Standard zoom
Focal length: 18–45 mm
Maximum aperture: f/4.5–6.3
Image circle: APS-C (23.5×15.6 mm)
Mount(s): Canon RF
Projection: Rectilinear
Stabilisation: Yes (optical)
Autofocus motor: stepping motor (STM)
Lensfun correction profile: Yes — distortion/vignetting/TCA

Equivalent focal length on different cameras#

Field of view and depth-of-field equivalence when this lens is used on bodies with different sensor sizes (natively or via an adapter).

Camera format	At 18 mm	At 28 mm	At 45 mm	Equiv. aperture (DoF)
APS-C	27 mm · 76°	42 mm · 53°	68 mm · 35°	f/6.8
APS-C (Canon)	29 mm · 73°	45 mm · 51°	72 mm · 33°	f/7.2
Micro Four Thirds	36 mm · 62°	56 mm · 42°	90 mm · 27°	f/9.0

Depth of field & background blur#

Computed on its native APS-C format (CoC 20 µm). “Blur @2 m” is the size of an out-of-focus point at infinity, as a percentage of frame width, with the subject at 2 m — a simple bokeh index. Full table: 20 mm f/5.6 on aps-c.

Focal	Aperture	at 1 m	at 2 m	at 5 m	at 10 m	Hyperfocal	Blur @2 m
18 mm	f/4.5	57.4 cm	3.03 m	∞	∞	3.70 m	0.2%
18 mm	f/8	1.22 m	45.6 m	∞	∞	2.09 m	0.1%
28 mm	f/4.5	22.1 cm	93.1 cm	8.11 m	∞	8.94 m	0.4%
28 mm	f/8	40.3 cm	1.86 m	643 m	∞	5.04 m	0.2%
45 mm	f/4.5	8.3 cm	34.2 cm	2.26 m	10.6 m	23.1 m	1.0%
45 mm	f/8	14.8 cm	61.8 cm	4.49 m	37.7 m	13.0 m	0.6%

Handheld & night-sky limits#

NPF assumes typical 20–24 MP sensors (≈6 µm pixels on full frame, ≈3.9 µm on APS-C, ≈3.3 µm on Micro Four Thirds).

Body	Min. handheld shutter (longest focal)	500 rule at 18 mm	NPF at 18 mm, f/4.5
APS-C	1/60 s	19 s	15 s
APS-C (Canon)	1/80 s	17 s	15 s
Micro Four Thirds	1/100 s	14 s	14 s

Compatible cameras#

Bodies in our database with a native Canon RF mount. Full-frame bodies switch to an APS-C crop with this lens.

Canon EOS R6 Mark III crop mode
Canon EOS C50 crop mode
Canon EOS R50 V 2025
Canon EOS R5 Mark II crop mode
Canon EOS R1 crop mode
Canon EOS R100 2023
Canon EOS R50 2023
Canon EOS R8 crop mode
Canon EOS R10 2022
Canon EOS R6 Mark II crop mode
Canon EOS R7 2022
Canon EOS R3 crop mode
Canon EOS R5 crop mode
Canon EOS R6 crop mode
Canon EOS RP crop mode
Canon EOS R crop mode
Canon EOS R5 C crop mode
Canon EOS R6 V crop mode
Canon EOS R8 Mark II crop mode

Adapt it to other systems#

Sony E-mount Nikon Z Fujifilm X-mount Canon EF-M Hasselblad XCD Nikon 1 (CX)Pentax Q

Similar lenses#

Sigma 18-50mm F2.8 DC DN | Contemporary 021 f/2.8
Sigma 17-40mm F1.8 DC | Art 025 f/1.8
Tamron 17-70mm F/2.8 Di III-A VC RXD f/2.8
Canon RF 24-105mm F4-7.1 IS STM f/4–7.1
Canon RF 24-105mm F4L IS USM f/4
Canon RF 24-50mm F4.5-6.3 IS STM f/4.5–6.3
Canon RF 24-70mm F2.8L IS USM f/2.8
Canon RF 28-70mm F2.8 IS STM f/2.8
Canon RF 28-70mm F2 L USM f/2
Canon RF-S55-210mm F5-7.1 IS STM f/5–7.1

Frequently asked questions#

Is the Canon RF-S 18-45mm F4.5-6.3 IS STM full frame?

No — it is designed for APS-C sensors. On a full-frame body it vignettes or triggers crop mode.

What is the Canon RF-S 18-45mm F4.5-6.3 IS STM equivalent to on APS-C?

Its focal length is already the real value for APS-C: 18–45 mm frames like 28–69 mm on full frame.

What is the Canon RF-S 18-45mm F4.5-6.3 IS STM good for?

As a standard zoom it suits everyday shooting, travel, events and walkaround use.

Sources & licences#

Lensfun lens database — CC BY-SA 3.0

Last updated October 03, 2026 · How we calculate · Sources