Canon RF 28-70mm F2 L USM Specs, Equivalents & Depth of Field

28–70 mm

Focal length

f/2

Maximum aperture

75°–34°

Diagonal angle of view (Full frame)

Full frame

Designed for

2.5×

Zoom ratio

Specifications#

Brand: Canon
Model: RF 28-70mm F2 L USM
Lens type: Standard zoom
Focal length: 28–70 mm
Maximum aperture: f/2
Image circle: Full frame (36×24 mm)
Mount(s): Canon RF
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 format	At 28 mm	At 44 mm	At 70 mm	Equiv. aperture (DoF)
Full frame	28 mm · 75°	44 mm · 52°	70 mm · 34°	f/2.0
APS-C	42 mm · 53°	66 mm · 36°	105 mm · 23°	f/3.0
APS-C (Canon)	45 mm · 51°	70 mm · 34°	112 mm · 22°	f/3.2
Micro Four Thirds	56 mm · 42°	88 mm · 28°	140 mm · 18°	f/4.0

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: 28 mm f/2 on full frame.

Focal	Aperture	at 1 m	at 2 m	at 5 m	at 10 m	Hyperfocal	Blur @2 m
28 mm	f/2	15.0 cm	61.8 cm	4.45 m	36.6 m	13.1 m	0.6%
28 mm	f/4	30.4 cm	1.33 m	18.1 m	∞	6.56 m	0.3%
28 mm	f/8	65.3 cm	3.80 m	∞	∞	3.29 m	0.1%
44 mm	f/2	5.9 cm	24.3 cm	1.57 m	6.82 m	32.3 m	1.4%
44 mm	f/4	11.9 cm	49.2 cm	3.39 m	19.9 m	16.2 m	0.7%
44 mm	f/8	24.0 cm	1.03 m	9.87 m	∞	8.11 m	0.3%
70 mm	f/2	2.3 cm	9.5 cm	60.6 cm	2.47 m	81.7 m	3.5%
70 mm	f/4	4.6 cm	18.9 cm	1.23 m	5.17 m	40.9 m	1.8%
70 mm	f/8	9.1 cm	38.2 cm	2.56 m	12.7 m	20.5 m	0.9%

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 28 mm	NPF at 28 mm, f/2
Full frame	1/80 s	18 s	9 s
APS-C	1/100 s	12 s	7 s
APS-C (Canon)	1/125 s	11 s	6 s
Micro Four Thirds	1/125 s	9 s	6 s

Compatible cameras#

Bodies in our database with a native Canon RF mount.

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#

Canon RF 28-70mm F2.8 IS STM 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-S 18-45mm F4.5-6.3 IS STM f/4.5–6.3
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-S55-210mm F5-7.1 IS STM f/5–7.1

Frequently asked questions#

Is the Canon RF 28-70mm F2 L USM full frame?

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

What is the Canon RF 28-70mm F2 L USM equivalent to on APS-C?

On a 1.5× APS-C body it frames like 42–105 mm, and like 45–112 mm on Canon APS-C.

What is the Canon RF 28-70mm F2 L USM 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