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Adapter compatibility · Konica → Canon

Konica AR to Canon EF cine adapter compatibility

Mounting a Konica AR lens on a Canon EF (cine) body — the feasibility verdict, AF / IS / aperture-control / infinity-focus outcome, image-circle relationship, official and reputable third-party adapter SKUs, and the caveats worth knowing before you buy.

Verdict at a glance

Speed booster
MFIS lens-onlyAp. wheel

Mount specs

Lens side

Konica AR

Flange distance
40.5 mm
Protocol
Mechanical only
Type
legacy-SLR

Body side

Canon EF (cine)

Flange distance
44 mm
Protocol
Canon EF
Type
cinema

The Konica ARlens’s flange distance (40.5 mm) is 3.50 mm shorter than the Canon EF cine body’s (44 mm). A mechanical adapter can only add distance between the lens and the sensor, never remove it, so a plain spacer cannot hold a Konica AR lens close enough to reach infinity focus. The verdict above calls for a focal reducer (Speed Booster) — its corrective optics bridge the deficit and add roughly a stop of light.

Flange-distance schematic. Two rails share a sensor plane on the right. The Canon EF cine body register measures 44 millimetres; the Konica AR lens needs only 40.5 millimetres, which is 3.50 millimetres shorter. The orange region marks the deficit a mechanical spacer cannot remove; a focal reducer is required.Sensor planeCanon EF cine body · 44 mmKonica AR lens · 40.5 mm−3.50 mm short
The Canon EF cine body holds any lens 44 mm off the sensor, but the Konica AR lens reaches infinity at 40.5 mm — 3.50 mm closer than the body allows. A mechanical adapter only adds distance, so a focal reducer (Speed Booster) is required to recover infinity focus.

Adapter examples

  • Speed Booster / focal-reducer family

Caveats

  • Flange clearance is only -3.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required.
  • Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.

Common questions

Will Konica AR lenses autofocus on a Canon EF (cine) body through an adapter?
No — Konica AR → Canon EF cine adapters are mechanical only. Focus is fully manual; rely on the Canon EF cine body's focus peaking and magnify-to-focus aids to nail focus.
Does in-lens image stabilization (IS / VR / OS) still work through a Konica AR → Canon EF cine adapter?
Lens-side only — the Konica AR lens's IS / VR / OS unit operates, but it cannot synchronise with the Canon EF cine body's IBIS, so the dual-axis stabilisation native Canon EF cine lenses enjoy isn't available. Lens-side stabilisation still delivers most of the practical benefit.
What's the most-recommended Konica AR → Canon EF cine adapter?
No SKU in our curated catalogue covers Konica AR → Canon EF cine yet. Adapter examples photographers commonly use include the Speed Booster / focal-reducer family. Pair compatibility is mostly mechanical, so any well-built adapter at the correct flange distance should work — pick on build quality and tripod-foot integration.

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