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Adapter compatibility · Pentax / Ricoh → Konica

Pentax K to Konica AR adapter compatibility

Mounting a Pentax K lens on a Konica AR 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

Mechanical
MFIS lens-onlyAp. wheel

Mount specs

Lens side

Pentax K

Flange distance
45.46 mm
Protocol
Pentax K (KAF/KAF2/KAF3/KAF4)
Type
DSLR

Body side

Konica AR

Flange distance
40.5 mm
Protocol
Mechanical only
Type
legacy-SLR

Flange-distance gap the adapter fills: 4.96 mm (45.46 mm − 40.5 mm). That gap is what a mechanical adapter has to fill to hold the lens at its design distance from the sensor.

Flange-distance schematic. Two rails share a sensor plane on the right. The Konica AR body register measures 40.5 millimetres; the Pentax K lens needs 45.46 millimetres. The orange region between their left edges is the 4.96 millimetre gap an adapter spans.Sensor planeKonica AR body · 40.5 mmPentax K lens · 45.46 mm+4.96 mm adapter
Both distances right-aligned to the sensor. The 4.96 mm gap between the Konica AR body register and the Pentax K lens (orange) is exactly what a mechanical adapter fills to hold the lens at its design distance.

Adapter examples

  • generic mechanical adapter ring (multiple vendors)

Caveats

  • Mechanical adapter only — no electronic communication between Pentax K lens and Konica AR body.
  • Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.

Common questions

Will Pentax K lenses autofocus on a Konica AR body through an adapter?
No — Pentax K → Konica AR adapters are mechanical only. Focus is fully manual; rely on the Konica AR body's focus peaking and magnify-to-focus aids to nail focus.
Does in-lens image stabilization (IS / VR / OS) still work through a Pentax K → Konica AR adapter?
Lens-side only — the Pentax K lens's IS / VR / OS unit operates, but it cannot synchronise with the Konica AR body's IBIS, so the dual-axis stabilisation native Konica AR lenses enjoy isn't available. Lens-side stabilisation still delivers most of the practical benefit.
What's the most-recommended Pentax K → Konica AR adapter?
No SKU in our curated catalogue covers Pentax K → Konica AR yet. Adapter examples photographers commonly use include the generic mechanical adapter ring (multiple vendors). 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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