Sigma 18-50mm F2.8 DC DN | Contemporary 021 Specs & DoF

18–50 mm

Focal length

f/2.8

Maximum aperture

76°–32°

Diagonal angle of view (APS-C)

APS-C

Designed for

2.8×

Zoom ratio

Specifications#

Brand: Sigma
Model: 18-50mm F2.8 DC DN | Contemporary 021
Lens type: Standard zoom
Focal length: 18–50 mm
Maximum aperture: f/2.8
Image circle: APS-C (23.5×15.6 mm)
Mount(s): Sony E-mount, L-Mount, Fujifilm X-mount, Canon RF
Projection: Rectilinear
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 30 mm	At 50 mm	Equiv. aperture (DoF)
APS-C	27 mm · 76°	45 mm · 50°	75 mm · 32°	f/4.2
APS-C (Canon)	29 mm · 73°	48 mm · 48°	80 mm · 30°	f/4.5
Micro Four Thirds	36 mm · 62°	60 mm · 40°	100 mm · 24°	f/5.6

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/2.8 on aps-c.

Focal	Aperture	at 1 m	at 2 m	at 5 m	at 10 m	Hyperfocal	Blur @2 m
18 mm	f/2.8	34.1 cm	1.51 m	28.9 m	∞	5.93 m	0.2%
18 mm	f/4	50.2 cm	2.48 m	∞	∞	4.16 m	0.2%
18 mm	f/8	1.22 m	45.6 m	∞	∞	2.09 m	0.1%
30 mm	f/2.8	11.8 cm	48.6 cm	3.33 m	19.2 m	16.5 m	0.7%
30 mm	f/4	17.0 cm	70.6 cm	5.31 m	69.6 m	11.5 m	0.5%
30 mm	f/8	34.7 cm	1.55 m	34.1 m	∞	5.78 m	0.2%
50 mm	f/2.8	4.2 cm	17.1 cm	1.10 m	4.58 m	45.7 m	1.9%
50 mm	f/4	6.0 cm	24.5 cm	1.59 m	6.90 m	32.0 m	1.4%
50 mm	f/8	11.9 cm	49.6 cm	3.43 m	20.3 m	16.0 m	0.7%

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/2.8
APS-C	1/80 s	19 s	12 s
APS-C (Canon)	1/80 s	17 s	12 s
Micro Four Thirds	1/100 s	14 s	11 s

Compatible cameras#

Bodies in our database with a native Sony E-mount, L-Mount, Fujifilm X-mount and Canon RF mount. Full-frame bodies switch to an APS-C crop with this lens.

Adapt it to other systems#

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

Similar lenses#

Canon RF-S 18-45mm F4.5-6.3 IS STM f/4.5–6.3
Fujifilm XF 18-55mm f/2.8-4 R LM OIS f/2.8–4
Sony E 18-55mm f/3.5-5.6 OSS f/3.5–5.6
Sony E PZ 18-105mm f/4 G OSS f/4
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
Tamron E 17-28mm F2.8-2.8 f/2.8
Sony FE 20-70mm f/4 G f/4
Panasonic S 20-60mm f/3.5-5.6 f/3.5–5.6
Fujifilm XC 16-50mm f/3.5-5.6 OIS f/3.5–5.6
Fujifilm XC 16-50mm f/3.5-5.6 OIS II f/3.5–5.6
Fujifilm XF 16-50mm f/2.8-4.8 R LM WR f/2.8–4.8

Frequently asked questions#

Is the Sigma 18-50mm F2.8 DC DN | Contemporary 021 full frame?

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

What is the Sigma 18-50mm F2.8 DC DN | Contemporary 021 equivalent to on APS-C?

Its focal length is already the real value for APS-C: 18–50 mm frames like 28–77 mm on full frame.

What is the Sigma 18-50mm F2.8 DC DN | Contemporary 021 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