Sigma 28-45mm f/1.8 DG DN A (Art) Autofocus Lens for Sony E-Mount, Black {82}

Sigma 28-45mm f/1.8 DG DN Art: the first full-frame mirrorless zoom to hold f/1.8 across its entire range.

No zoom lens for full-frame mirrorless had maintained f/1.8 from end to end before this one. The 28-45mm f/1.8 DG DN Art does exactly that, giving you a constant maximum aperture across a wide-to-normal focal range that covers street-wide perspectives at 28mm and natural-compression portrait work at 45mm. The f/1.8 ceiling isn't a marketing floor, it's available at every focal length, which changes how you think about swapping between focal lengths in low light. The 82mm filter thread signals what's inside: this is a physically serious lens built to Art series optical standards.

Sigma's DG DN designation means the optical and mechanical design was built specifically for mirrorless flange distances, not adapted from DSLR geometry. The result is autofocus behavior and rear element placement tuned for Sony E-mount bodies from the ground up. Video shooters get a design that accounts for focus breathing and smooth aperture transitions. For anyone running a Sony FX or Alpha body through mixed narrative and documentary work, carrying one lens from 28 to 45mm at f/1.8 instead of two or three primes is a real logistical shift, without trading optical character to get there.

Who It's For

Event and wedding photographers working reception floors or dimly lit ceremonies will find f/1.8 at 28mm a different proposition than any zoom they've used before. Documentary and street photographers who need focal-length flexibility without switching glass mid-scene can run the full 28-45mm range in continuous low-light situations. Video operators on Sony FX3 or FX30 bodies benefit from the mirrorless-native construction and smooth aperture behavior. Portrait shooters who want something wider than a 50mm prime for environmental work but won't accept a slow variable aperture get a real option at 45mm f/1.8.

Key Features

• World's first full-frame mirrorless zoom with f/1.8 across entire range
• 28-45mm wide-to-normal focal length coverage
• Prime-like optical performance throughout zoom range
• DG DN design optimized for Sony E-mount flange distance
• 82mm filter thread signals substantial internal optics
• Video-friendly design with controlled focus breathing and smooth aperture transitions
• Art series optical standards and construction

FAQ

Does the f/1.8 aperture stay constant across the entire 28-45mm range?

Yes. This is the defining feature - f/1.8 is available at 28mm, 45mm, and every focal length in between. No zoom lens for full-frame mirrorless had done this before.

How does DG DN design differ from a DSLR-adapted Art lens?

DG DN means the optical and mechanical design was built from scratch for mirrorless flange distances, not converted from DSLR geometry. That translates to autofocus tuning and rear element placement optimized for Sony E-mount bodies, plus video-friendly focus breathing control.

What focal range does 28-45mm actually cover?

28mm gives you street-wide perspectives; 45mm sits in natural-compression territory for portraiture and medium framing. It's a wide-to-normal range built for mixed narrative and documentary work without swapping lenses.

Is this lens suitable for video work?

Yes. The design accounts for focus breathing and smooth aperture transitions, making it a solid choice for narrative and documentary video on Sony FX and Alpha bodies.

Why does the 82mm filter thread matter?

Filter thread size reflects optical ambition. An 82mm thread signals a physically substantial lens with serious glass inside, built to Art series optical standards.

Can this replace multiple primes in my kit?

That depends on your workflow, but the constant f/1.8 and 28-45mm range make it viable for photographers who'd otherwise carry two or three primes for similar coverage. You're trading focal flexibility for optical consistency and kit weight.

How does autofocus perform with Sony E-mount bodies?

Autofocus behavior is tuned specifically for Sony E-mount, since DG DN construction was designed for mirrorless from the ground up rather than adapted from DSLR design.