Tamron 12-20mm f/2.8: G Master Performance at Half the Price

Tamron just dropped the old SP and Di III branding and launched its first lens under a cleaner identity: the 12-20mm f/2.8. The proposition is familiar — deliver a fast maximum aperture at a price well below Sony’s equivalent — but this time, the optical engineering is strong enough to make the comparison uncomfortable for Sony. At $1,700 for Sony E-mount, the 12-20mm f/2.8 costs roughly half what Sony charges for its G Master 12-24mm f/2.8.

What Makes It Different

Three areas stand out in testing. Flare and ghosting control is excellent — the kind of result that rewards photographers who shoot toward light sources, a common scenario in landscape and astrophotography. Sagittal coma is well-corrected, which means stars in the corners stay as points rather than the comet-shaped smears that plague cheaper ultra-wides at night. And lens breathing is minimal enough to make this a credible video ultra-wide — the focal length doesn’t creep when you pull focus.

The 12-blade aperture produces clean, dramatic sunstars when stopped down. Build quality reflects the new branding: weather-sealing, USB-C for firmware updates, and customizable control rings all make it a premium-feeling package. Nikon Z-mount buyers pay an extra $100 at $1,800 and gain the advantage of having no direct Nikon equivalent at this aperture — the lens fills a genuine gap in that system.

PetaPixel’s full review and The Phoblographer’s astrophotography-focused test both reach similar conclusions on its standout strengths.

The Catch / Who It’s For

There are real optical compromises to know before buying. Vignetting at f/2.8 is heavy and will require correction in post — noticeable enough in night skies that most users will build a correction profile before relying on it seriously. At the 20mm end, field curvature is severe: stopping down improves center sharpness but simultaneously softens corners, making 20mm at mid-apertures a tricky proposition. Highlight bokeh shows harsh halos around out-of-focus lights.

For landscape and astrophotographers who shoot stopped down or at infinity, none of these are dealbreakers. For anyone shooting wide-open portraits or events where smooth background rendering defines the frame, the optical character is a mismatch. The lens is available for pre-order at B&H Photo and ships August 27.

Stack Archive has covered Tamron’s portfolio evolution and the ultra-wide landscape lens category previously — this lens complicates both in useful ways.

Source: PetaPixel

Content created with AI assistance and reviewed for accuracy.