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Black aluminium M42 adapter ring 65mm 2.5in diameter

Ruth's sister

Ruth's sister M42 Adapter Ring 65mm 2.5in Black

SKU CH-E77V-P7CJJ

Adapter ring converts M42 lenses to Sony Alpha A-mount cameras with full manual control

  • M42 lenses mount on Sony Alpha cameras via precision aluminium adapter ring
  • 65 mm diameter ensures secure fit for A900 A550 A850 A7 A6000 models
  • Manual focus and exposure control retained with full aperture-priority support
  • CE-certified aluminium construction provides durable, stable connection
  • Single adapter ring included, ready for immediate lens conversion

M42 Adapter Ring 65 mm 2.5 in

This aluminium adapter ring lets M42 screw-mount lenses attach to Sony Alpha A-mount cameras such as the A900, A550, A850, A7 and A6000. It provides a secure, high-precision connection while retaining full manual control over focus, exposure and aperture priority. The black anodised finish resists wear and the 65 mm diameter matches the listed specification. Only the adapter ring is included.

Suited for manual-lens users not for autofocus

Photographers who enjoy manual focusing and want to use vintage M42 glass on Alpha A-mount bodies will find this ring a simple, solid solution. It does not transmit electronic signals, so autofocus, auto-exposure and lens metadata are unavailable. Buyers who require autofocus or electronic aperture control should look at a different solution.

M42 to Alpha A mount conversion

The single deciding specification is the mount conversion: M42 male thread to Sony Alpha A female bayonet. If your lens uses the 42 mm screw thread and your camera uses the Alpha A mount, this 65 mm aluminium ring enables the pairing; if either side differs, the adapter will not fit.

Highlights

  • M42 lenses mount on Sony Alpha cameras via precision aluminium adapter ring
  • 65 mm diameter ensures secure fit for A900 A550 A850 A7 A6000 models
  • Manual focus and exposure control retained with full aperture-priority support
  • CE-certified aluminium construction provides durable, stable connection
  • Single adapter ring included, ready for immediate lens conversion

Specifications

No published specifications for this item yet.

Questions about this item

Does the 65 mm diameter create any vignetting with M42 lenses on an A7 body?

The adapter ring is machined to a 65 mm outer diameter and 2.5 in size, matching the M42 thread; vignetting depends on the specific lens design rather than the ring itself.

Will the aluminum ring get hot or affect metering during all-day shooting on an A900?

The all-aluminum construction stays at ambient temperature and has no electronic contacts, so it adds no heat and does not interfere with the camera’s metering system.

Which Sony Alpha models are confirmed compatible with the 4NB402012 adapter?

The ring fits Sony Alpha A-mount bodies including the A900, A850, A550, A7 series and A6000, letting M42 screw-mount lenses mount directly.

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