Tamron 17-70mm f/2.8 Di III-A VC RXD APS-C Lens for Sony E-Mount {67} B070

Tamron 17-70mm f/2.8 VC: APS-C's widest-range constant-aperture zoom.

For Sony APS-C shooters who want one lens to cover most situations, this 17-70mm delivers a 25.5-105mm full-frame equivalent at a constant f/2.8 across the full 4.1x zoom range. That combination is rare in this format, most lenses at this zoom ratio sacrifice a stop or more of light. The RXD stepping motor keeps autofocus fast and near-silent, which matters in run-and-gun situations where a whirring focus mechanism would ruin audio or spook a subject.

The optical formula runs 16 elements across 12 groups, with aspherical and low-dispersion glass to keep aberrations in check throughout the range. BBAR coatings on individual elements cut flare and ghosting when shooting into backlit scenes. On the handling side, Tamron's VC (Vibration Compensation) system is built in, a notable addition on an APS-C zoom this compact, and it applies AI-assisted stabilization when recording video. The 19 cm minimum focusing distance at the wide end opens up close-focus work without switching lenses. At 525 g with a 67mm filter thread, it stays manageable on compact Sony bodies like the a6600 or ZV-E10. For shooters who want to leave the bag at home and carry one lens all day, the math adds up.

Who It's For

Street and documentary photographers get a wide 17mm for environmental context and a 70mm reach for tighter moments, all without stopping down in mixed light. Travel shooters benefit from the 525 g weight and single-lens coverage spanning wide architecture to short telephoto portraits. Video creators working on Sony APS-C bodies will appreciate the silent RXD autofocus and in-lens VC, both of which reduce the need for post-production stabilization. Close-up and product shooters can work at 19 cm from a subject at the wide end without adding a dedicated macro lens to the kit.

Key Features

• 17-70mm constant f/2.8 aperture across entire 4.1x zoom range
• 25.5-105mm full-frame equivalent on Sony APS-C
• RXD stepping motor for fast, silent autofocus
• Built-in VC vibration compensation with AI-assisted video stabilization
• 19cm minimum focusing distance at wide end
• 16 elements with aspherical and low-dispersion glass
• BBAR coatings reduce flare and ghosting
• 67mm filter thread, 525g weight

FAQ

What's the full-frame equivalent focal length?

25.5-105mm on Sony APS-C bodies. The 4.1x zoom ratio at f/2.8 across the entire range is what makes this lens unusual-most competitors drop to f/4 or slower in the telephoto end.

How does the RXD autofocus motor compare to standard AF systems?

RXD is Tamron's stepping motor that focuses fast and nearly silent. Matters if you're shooting video or situations where AF noise would wreck the take.

Does this lens have image stabilization?

Yes. VC (Vibration Compensation) is built in, and Tamron's AI-assisted stabilization kicks in during video recording for smoother handheld footage.

What's the minimum focusing distance?

19 cm (7.5 inches) at the wide end, 39 cm at 70mm. Close enough for product work or environmental portraits without a macro lens.

How heavy is this lens and what filter size does it use?

525 grams with a 67mm filter thread. Stays compact on bodies like the a6600 or ZV-E10 without adding bulk to your bag.

What optical corrections does this lens include?

16 elements across 12 groups with aspherical and low-dispersion glass. BBAR coatings on individual elements suppress flare and ghosting in backlit scenes.

Is this lens weather-sealed?

The lens features moisture-resistant construction and fluorine coating for durability, though it's not fully sealed like higher-end pro zooms.