Sigma 18-35mm f/1.8 DC HSM [A] Specs & DoF

18–35 mm

Focal length

f/1.8

Maximum aperture

76°–44°

Diagonal angle of view (APS-C)

APS-C

Designed for

1.9×

Zoom ratio

Specifications#

Brand: Sigma
Model: 18-35mm f/1.8 DC HSM [A]
Lens type: Standard zoom
Focal length: 18–35 mm
Maximum aperture: f/1.8
Image circle: APS-C (23.5×15.6 mm)
Mount(s): Canon EF, Sigma SA, Nikon F, Sony / Minolta A-mount, Pentax K
Projection: Rectilinear
Autofocus motor: hypersonic (HSM)
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 25 mm	At 35 mm	Equiv. aperture (DoF)
APS-C	27 mm · 76°	38 mm · 59°	52 mm · 44°	f/2.7
APS-C (Canon)	29 mm · 73°	40 mm · 56°	56 mm · 42°	f/2.9
Micro Four Thirds	36 mm · 62°	50 mm · 47°	70 mm · 34°	f/3.6

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/1.8 on aps-c.

Focal	Aperture	at 1 m	at 2 m	at 5 m	at 10 m	Hyperfocal	Blur @2 m
18 mm	f/1.8	21.6 cm	90.3 cm	7.66 m	∞	9.22 m	0.4%
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%
25 mm	f/1.8	11.0 cm	45.1 cm	3.04 m	16.4 m	17.8 m	0.7%
25 mm	f/4	24.8 cm	1.05 m	10.2 m	∞	8.01 m	0.3%
25 mm	f/8	51.9 cm	2.62 m	∞	∞	4.02 m	0.2%
35 mm	f/1.8	5.6 cm	22.7 cm	1.46 m	6.24 m	34.8 m	1.5%
35 mm	f/4	12.4 cm	51.0 cm	3.53 m	21.4 m	15.7 m	0.7%
35 mm	f/8	25.0 cm	1.07 m	10.6 m	∞	7.86 m	0.3%

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/1.8
APS-C	1/50 s	19 s	10 s
APS-C (Canon)	1/60 s	17 s	10 s
Micro Four Thirds	1/80 s	14 s	9 s

Compatible cameras#

Bodies in our database with a native Canon EF, Sigma SA, Nikon F, Sony / Minolta A-mount and Pentax K mount. Full-frame bodies switch to an APS-C crop with this lens.