Cameras Ranked

45 Sigma 45mm F2.8 DG

The Sigma 45mm F2.8 DG is a prime lens for Sony E-mount (Full frame) that covers 45 mm at f/2.8, weighs 235 g and focuses as close as 0.24 m. Next to 10 other full frame Sony E-mount prime lenses in its focal range, it suits you if you carry it all day or travel light, or you want a wider view at the short end. If you shoot in low light or want a blurrier background, every other one that does better on brightness gives up width.

  • f/2.8widest aperture
  • 235 gweight
  • 51bodies it fits
To one scale. Sigma 45mm F2.8 DG: length 48.2 mm, diameter 64 mm, filter thread 55 mm.48.2 mmø64
To scale from the maker's length and diameter, the mount on the left and the filter thread in yellow at the front. The rings are drawn, not measured.

Compare it with another lensAll Sony E-mount lenses

To one scale. Sigma 45mm F2.8 DG: length 48.2 mm, diameter 64 mm, filter thread 55 mm.48.2 mmø64
To scale from the maker's length and diameter, the mount on the left and the filter thread in yellow at the front. The rings are drawn, not measured.

Where it sits

11 lenses

Full frame Sony E-mount prime lenses in its focal range that state each value, this one included. Each tick is one; the thick one is this one.

Bodies it fits

51 bodies

All cameras, by maker and mount

Specifications

Focal length
45 mm
Widest aperture
f/2.8
Closest focus
0.24 m1
Maximum magnification
0.25x1
Stabilization
No
Mount
Sony E-mount1
Covers
Full frame
Type
Prime
Weight
235 g1
Length
48.2 mm1
Diameter
64 mm1
Filter thread
55 mm1
Elements
81
Groups
71
Aperture blades
71
Hood
LH577-02B/LH577-02S1

Sources

  1. SIGMA lens specifications (sigma-global.com), checked Oct 15, 2026

Worked out by code, not stated by a source

  • Focal length and widest aperture as the lens's own name states them.
  • Read from the lens name: each maker marks the sensor size a lens covers (Sony FE/E, Canon RF/RF-S, Nikon DX, Tamron Di III/Di III-A, Sigma DG/DC); every Fujifilm X lens is APS-C and every Micro Four Thirds lens is Four Thirds.
  • Read from the lens name: Sony marks optically stabilized lenses OSS, Canon IS, Nikon VR, Fujifilm OIS, Panasonic O.I.S., Tamron VC and Sigma OS; a lens from these makers without the mark has no optical stabilization.
  • Prime or zoom, read from the focal length in the lens name.

Each value is checked automatically against the source it links, on the date shown. How we build these pages

† The makers' own tables, row by row, with labels in our plain words (translated where the maker's page isn't in English); each row's numbers are checked against the page it links.

Full specifications†

Show all 12 rows
Full specificationsSigma 45mm F2.8 DG1
Supported sensor formatFull-frame [DG]
Optical element configuration8 elements in 7 groups (2 aspherical lens elements)
Field of view51.3°
Aperture blade count7 (Rounded diaphragm)
Smallest aperture settingF22
Closest focus distance24cm / 9.4in.
Highest magnification ratio1:4
Filter thread diameterφ55mm
Physical sizeφ64.0mm × 48.2mm / φ2.5in. × 1.9in. (Sony E-mount)
Lens mass235g / 8.3oz. (Sony E-mount)
Release edition codeC019
Included accessoriesLENS HOOD(LH577-02B/LH577-02S), MAGNETIC METAL LENS CAP(LCF55-02 MB/LCF55-02 MS), FRONT CAP(LCF-55 IV), REAR CAP(LCR III), Pouch

How the pick works

  1. Widest aperture3

    Lower wins once they are 0.3 apart.

  2. Weight2

    Lower wins from a 12% gap.

  3. Focal length (longest)2

    Higher wins from a 15% gap.

  4. Focal length (widest)2

    Lower wins once they are 2 mm apart.

  5. Optical stabilization1

    Having it wins.

  6. Closest focus, wide end1

    Lower wins from a 15% gap. Compared only between lenses of the same focal length (widest).

  7. Filter thread0.5

    Lower wins once they are 5 mm apart.

  8. Lead for a pick1

Our pick or our take adds up the importance of each real difference, with these importances and thresholds: a gap smaller than its row's threshold is too close to call and counts as the same. They are our editorial choice, not a measurement, the same on every page, and they never read prices, sales or who sells it.

Paid placements0

How we rank, in full