Tamron 20mm f/2.8 Di III OSD M1:2 Full-Frame Lens for Sony E-Mount, Black {67} F050

20mm f/2.8 prime that focuses to 4.3 inches

At 221g and 63.5mm long, this lens disappears into a jacket pocket and stays there until you need it. The 94°30' angle of view gives you the spatial drama that ultra-wide shooting is built on, and the internal focus design keeps the barrel length fixed regardless of where you're focused, so the front element never creeps toward your subject. Weather sealing and a fluorine coating on the front element mean shooting in light rain or dusty conditions without second-guessing the decision.

The standout spec is the 4.3" minimum focus distance, which unlocks a 0.5x (1:2) maximum magnification ratio. That's a capability set you don't expect from an ultra-wide prime, and it changes how you think about composition. Get low, get close, and the wide perspective does the rest, foreground subjects loom large while backgrounds stretch away. The OSD (Optimized Silent Drive) autofocus runs quietly, which matters for video work or any situation where AF noise bleeds into audio. Low-dispersion and aspherical elements in the 10-element, 9-group design keep chromatic aberration controlled across the frame, and BBAR coating holds contrast in place against strong light sources. The 67mm filter thread matches Tamron's other E-mount primes in this lineup, so one set of filters covers the whole series.

Who It's For

Travel and street photographers working Sony full-frame bodies will appreciate the 221g weight and pocketable 63.5mm length, this lens doesn't shift the balance of an A7-series body the way heavier glass does. Architecture and interior shooters get the 94°30' field of view without needing a tilt-shift budget. Close-up and environmental portrait photographers can exploit the 4.3" minimum focus distance to place subjects in context with dramatic foreground-to-background separation. Videographers benefit from the silent OSD autofocus motor, which avoids the focus-hunting noise that ruins otherwise clean audio tracks.

Key Features

• 20mm focal length with 94°30' angle of view on full-frame
• f/2.8 maximum aperture, f/22 minimum
• 4.3" minimum focus distance with 0.5x magnification ratio
• 10 elements in 9 groups with low-dispersion and aspherical elements
• OSD autofocus with internal focus mechanism
• Weather-sealed with fluorine-coated front element
• 221g weight, 63.5mm length for pocket portability
• 67mm filter thread matches Tamron E-mount series

FAQ

What's the closest you can focus with this lens?

4.3 inches. That 1:2 magnification ratio opens up close-range composition options you don't usually get from an ultra-wide - low angle, close subject in frame, and the background stretches dramatically away.

Does this lens have image stabilization?

No. At 20mm on a mirrorless body, you're working with enough depth of field that handheld shutter speeds stay reasonable even in moderate light. If you need stabilization, you're relying on in-body IS.

How does the OSD autofocus perform for video?

The Optimized Silent Drive is quiet enough that AF noise won't bleed into your audio track, which is the main reason Tamron engineered it this way. Speed and precision are solid for tracking moving subjects.

Will my existing filters work on this lens?

If you've got 67mm filters from other Tamron E-mount primes, yes. The filter thread matches the rest of the Di III lineup.

Is the barrel fixed when you focus?

Yes. Internal focus design keeps the barrel length at 63.5mm regardless of focus distance, so the front element never extends toward your subject.

What about shooting in rain or dust?

Weather sealing and a fluorine coating on the front element give you confidence in light rain or dusty conditions. You're not weatherproofed for submersion, but casual outdoor abuse is covered.

Does it have an aperture ring?

No. Aperture control is electronic only, which is standard for modern mirrorless E-mount lenses.