Wide-angle zoom · Full frame

Canon EF 20-35mm f/3.5-4.5 USM

The Canon EF 20-35mm f/3.5-4.5 USM is a full frame zoom lens (20–35 mm, f/3.5–4.5) for Canon EF. It belongs to the wide-angle zoom class — ideal for landscapes, architecture, interiors and astrophotography.

20–35 mmf/3.5–4.5Canon EF
20–35 mm
Focal length
f/3.5–4.5
Maximum aperture
94°–63°
Diagonal angle of view (Full frame)
Full frame
Designed for
1.8×
Zoom ratio

Specifications#

Brand
Canon
Model
EF 20-35mm f/3.5-4.5 USM
Lens type
Wide-angle zoom
Focal length
20–35 mm
Maximum aperture
f/3.5–4.5
Image circle
Full frame (36×24 mm)
Mount(s)
Canon EF
Projection
Rectilinear
Autofocus motor
ultrasonic (USM)
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 formatAt 20 mmAt 26 mmAt 35 mmEquiv. aperture (DoF)
Full frame20 mm · 94°26 mm · 80°35 mm · 63°f/3.5
APS-C30 mm · 70°39 mm · 57°52 mm · 44°f/5.2
APS-C (Canon)32 mm · 68°42 mm · 55°56 mm · 42°f/5.6
Micro Four Thirds40 mm · 57°52 mm · 45°70 mm · 34°f/7.0

Depth of field & background blur#

Computed on its native Full frame format (CoC 30 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/4 on full frame.

FocalApertureat 1 mat 2 mat 5 mat 10 mHyperfocalBlur @2 m
20 mmf/3.555.1 cm2.85 m∞∞3.83 m0.2%
20 mmf/464.4 cm3.67 m∞∞3.35 m0.1%
20 mmf/81.80 m∞∞∞1.69 m0.1%
26 mmf/3.531.0 cm1.35 m19.2 m∞6.46 m0.3%
26 mmf/435.6 cm1.60 m40.1 m∞5.66 m0.2%
26 mmf/878.6 cm5.51 m∞∞2.84 m0.1%
35 mmf/3.516.7 cm69.3 cm5.20 m63.2 m11.7 m0.5%
35 mmf/419.1 cm80.0 cm6.37 m414 m10.2 m0.4%
35 mmf/839.2 cm1.81 m181 m∞5.14 m0.2%

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).

BodyMin. handheld shutter (longest focal)500 rule at 20 mmNPF at 20 mm, f/3.5
Full frame1/40 s25 s15 s
APS-C1/50 s17 s12 s
APS-C (Canon)1/60 s16 s12 s
Micro Four Thirds1/80 s12 s11 s

Compatible cameras#

Bodies in our database with a native Canon EF mount.

Adapt it to other systems#

Sony E-mountCanon RFNikon ZFujifilm X-mountMicro Four ThirdsL-MountCanon EF-MFujifilm G-mountHasselblad XCDNikon 1 (CX)Pentax QSamsung NXNikon FPentax K

Similar lenses#

Frequently asked questions#

Is the Canon EF 20-35mm f/3.5-4.5 USM full frame?

Yes — it covers the full 36 × 24 mm frame.

What is the Canon EF 20-35mm f/3.5-4.5 USM equivalent to on APS-C?

On a 1.5× APS-C body it frames like 30–52 mm, and like 32–56 mm on Canon APS-C.

What is the Canon EF 20-35mm f/3.5-4.5 USM good for?

As a wide-angle zoom it suits landscapes, architecture, interiors and astrophotography.

Sources & licences#

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