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Adapter compatibility · Various (Tamron-originated standard) → Pentax / Ricoh

T-mount to Pentax K adapter compatibility

Mounting a T-mount (T2) lens on a Pentax K 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
MFno ISAp. ring

Mount specs

Lens side

T-mount (T2)

Flange distance
55 mm
Protocol
Mechanical only
Type
legacy-SLR

Body side

Pentax K

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

Flange-distance gap the adapter fills: 9.54 mm (55 mm − 45.46 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 Pentax K body register measures 45.46 millimetres; the T-mount lens needs 55 millimetres. The orange region between their left edges is the 9.54 millimetre gap an adapter spans.Sensor planePentax K body · 45.46 mmT-mount lens · 55 mm+9.54 mm adapter
Both distances right-aligned to the sensor. The 9.54 mm gap between the Pentax K body register and the T-mount 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 T-mount (T2) lens and Pentax K body.

Common questions

Will T-mount (T2) lenses autofocus on a Pentax K body through an adapter?
Autofocus is not applicable to this pairing — the T-mount mount predates electronic AF, or the bodies in this family do not implement AF for adapted lenses.
Does in-lens image stabilization (IS / VR / OS) still work through a T-mount → Pentax K adapter?
Stabilisation is not applicable — T-mount lenses in this family do not ship with in-lens stabilisation, or the adapter pair predates the IS protocol entirely.
What's the most-recommended T-mount → Pentax K adapter?
No SKU in our curated catalogue covers T-mount → Pentax K 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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