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Sigma 45mm F/2.8 DG DN C (Contemporary) Full-Frame Autofocus Lens for Sony E-Mount, Black (55)

Model #381270
  • $337.00

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Sigma's 45mm f/2.8 DN: the compact standard prime for Sony mirrorless.

The 45mm focal length sits in a genuinely useful spot, slightly longer than a 35mm and less compressed than a 50mm, making it a natural framing length for everyday shooting, environmental portraits, and travel work. At f/2.8, you get enough separation from backgrounds to keep subjects distinct without the focus-shift anxiety that comes with faster glass. Sigma built this lens natively for Sony E-mount, so it communicates directly with Alpha bodies for autofocus and EXIF data without any adapter in the chain.

The Contemporary designation in Sigma's lineup has always prioritized optical quality at a size and weight that doesn't punish you for carrying it. This lens reflects that: it's designed specifically for full-frame mirrorless bodies, not a rehoused DSLR optic squeezed into a shorter flange distance. For Sony Alpha shooters who find the 24-70mm zoom too large for daily carry but still want a full-frame prime, the 45mm f/2.8 DG DN occupies that gap with a, proven optical formula. Five years of real-world use by photographers across multiple genres have confirmed its place as a solid walk-around prime.

Who It's For

Travel photographers who prioritize a compact kit will appreciate the native E-mount integration and the 45mm field of view that handles architecture, street scenes, and casual portraiture without swapping lenses. Documentary shooters working in candid situations benefit from an unobtrusive profile and the f/2.8 aperture in mixed or low light. Portrait photographers who want environmental context than tight head shots will find the 45mm framing keeps subjects grounded in their surroundings. Street photographers on Sony Alpha bodies get a lens that keeps pace with fast-moving scenes through native autofocus communication.

Key Features

  • Native Sony E-mount with direct autofocus and EXIF communication
  • 45mm focal length for environmental portraits and walk-around framing
  • f/2.8 maximum aperture with controlled background separation
  • Compact Contemporary design built specifically for mirrorless, not adapted from DSLR optics
  • Released 2019 with five years of real-world field validation

FAQ

Is this a native Sony lens or a third-party mount?
Sigma built this natively for Sony E-mount - no adapter needed, and autofocus and EXIF data work directly with Alpha bodies.
How does 45mm compare to 35mm or 50mm primes?
The 45mm focal length sits between them - longer than 35mm for tighter framing, shorter than 50mm to avoid the compression that can flatten faces in portraits. It's a natural middle ground for everyday shooting.
Why f/2.8 instead of f/1.4 or f/1.8?
At f/2.8, you get enough subject separation and shallow depth of field for environmental portraits and still-life work without the focus-shift problems that come with much faster glass. Faster apertures also push the lens size and weight up considerably.
What's the difference between Contemporary and Art lines in Sigma's lineup?
Contemporary prioritizes compact size and optical quality over maximum aperture. This 45mm is designed from the ground up for mirrorless, not adapted from a DSLR design.
How established is this optical formula?
Released in 2019, it's been in photographers' bags for five years across portraiture, travel, and everyday work. The design is proven and stable.
Will this work on APS-C Sony cameras?
Yes, it's native Sony E-mount, so it mounts to both full-frame and APS-C bodies. On APS-C, the effective focal length is roughly 67.5mm.
SpecificationValue
Focal Length45mm
Max Aperturef/2.8
MountSony E

This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.

Brand Name Sigma
Filter Size 55mm
Focus Type Autofocus (lens motor)
Lens Mount Sony E Mount
Lens Type Standard / Normal
Max Focal Length 45mm
Min Focal Length 45mm
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