Is the Urth Contax/Yashica to Sony E mechanically different from the K&F version?

No measurable difference — comparable OEM Shenzhen internals, identical infinity-focus calibration and bayonet fit. Urth differentiates on anodised finish, plastic-free recycled packaging, a lifetime warranty against manufacturing defects, and per-product tree planting. The adapter inside is approximately equivalent.

Which C/Y lenses pair best with it on a Sony α?

The Carl Zeiss Planar T* 50 mm f/1.4 and 85 mm f/1.4 are the headline adapts — the 85 in particular is a revered portrait lens. The Distagon 28 mm f/2.8, Sonnar 135 mm f/2.8, and the Tessar 45 mm f/2.8 pancake also adapt cleanly. All are manual-focus on this mechanical adapter.

Does it have a close-focus helicoid?

No — it's a flat ring that focuses to each lens's native minimum, nothing closer. There's no AF option for C/Y glass either (mechanical mount, no contacts); the appeal is the Zeiss rendering, not convenience features.

Urth · Contax → Sony E adapter

Urth Contax/Yashica to Sony E — Contax → Sony E adapter

Contax/Yashica (C/Y) bayonet onto Sony E with an anodised recycled-aluminum body and plastic-free packaging; one tree planted per product. Mechanical-only — no AF, no electronic aperture; focus by hand, aperture on the lens ring.

At a glance

Vendor: Urth
Release year: 2020
Body-side contacts: None (purely mechanical)
Flags: firmware-updatable —weather-sealed —requires glass —

What this adapter preserves

Compatibility for Contax lens on a Sony E body (computed from the lensmount dataset — open the Contax to Sony E adapter page for the full verdict, flange clearance, and adapter caveats).

Focus: Manual focus only
IS: No IS
Aperture: Manual aperture ring
Infinity focus: Reaches infinity

What it does

Flat glassless ring: the 45.5 mm C/Y flange clears Sony E's 18 mm by 27.5 mm, so infinity focus is preserved without corrective optics. Mechanically equivalent to K&F's Pro-line internals at a finish / sustainability premium.

Common questions

Is the Urth Contax/Yashica to Sony E mechanically different from the K&F version?: No measurable difference — comparable OEM Shenzhen internals, identical infinity-focus calibration and bayonet fit. Urth differentiates on anodised finish, plastic-free recycled packaging, a lifetime warranty against manufacturing defects, and per-product tree planting. The adapter inside is approximately equivalent.
Which C/Y lenses pair best with it on a Sony α?: The Carl Zeiss Planar T* 50 mm f/1.4 and 85 mm f/1.4 are the headline adapts — the 85 in particular is a revered portrait lens. The Distagon 28 mm f/2.8, Sonnar 135 mm f/2.8, and the Tessar 45 mm f/2.8 pancake also adapt cleanly. All are manual-focus on this mechanical adapter.
Does it have a close-focus helicoid?: No — it's a flat ring that focuses to each lens's native minimum, nothing closer. There's no AF option for C/Y glass either (mechanical mount, no contacts); the appeal is the Zeiss rendering, not convenience features.

Mounts on either side

Lens side

Contax/Yashica (C/Y)

Flange 45.5 mm · Contax / Yashica

Open mount page →

Body side

Sony E (incl. FE)

Flange 18 mm · Sony

Open mount page →

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