Decision tools · Mount Adapting

Will my lenses fit a different body?

Pick the mount your glass is on and the body you're thinking of moving to. We work out whether a plain adapter gets you there, show the millimetres it turns on, and say what it does to your framing.

37 mounts on record·flange distance, coverage and crop for each

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Answers focus and framing. Autofocus, aperture control and whether an adapter is actually made are separate questions.

Your pairing

Leica Screw Mount (M39) glass on a Pentax K body

Optics
Verdict
Leica Screw Mount (M39)28.80mm
− Pentax K 45.46mm
Room for an adapter-16.66mm

Only with corrective optics

Pentax K sits 16.66mm further from the sensor than Leica Screw Mount (M39). An adapter can only add distance, never remove it, so infinity focus is impossible without corrective glass in the adapter — which costs sharpness and usually a stop of light.

Coverage & framing. Both are Full frame, so the lens covers the sensor fully.

Pentax K bodiesPentax K-1 Mark IIPentax KFPentax K-3 Mark III

Every combination

Lens mounts down the side, current camera mounts across the top. Figures are flange focal distance in millimetres. Click any cell for the full answer.

NativeNative fitSame mount. The lens bolts straight on — no adapter, nothing lost.
AdapterWorks with a plain adapterYou still need an adapter, but only a plain one — a hollow metal spacer with no glass in it. Focus and image quality are unaffected.
ThinNeeds a thin adapterThe two mounts sit almost the same distance from the sensor, so any adapter has to be wafer-thin or flush. These exist for common pairings and often don't for rare ones.
OpticsOnly with corrective opticsA plain adapter cannot work — it would have to remove distance, which is impossible. Only an adapter with corrective glass inside will focus to infinity, and that costs sharpness and usually a stop of light.
Lens mountNikon Z16.00Fujifilm X17.70Sony E18.00Hasselblad X18.14Micro Four Thirds19.25Canon RF20.00Leica L20.00Fujifilm G26.70Pentax K45.46
Pentax 6x784.95 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapter
Hasselblad V74.90 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapter
Pentax 64570.87 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapter
Bronica ETR69.00 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapter
Mamiya M64563.30 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapter
Leica R47.00 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterThin
Nikon F46.50 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterThin
Olympus OM46.00 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterThin
Contax/Yashica45.50 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterThin
M4245.46 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterThin
Pentax K45.46 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterNative
Exakta44.70 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Topcon44.70 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Minolta/Sony A44.50 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Rollei QBM44.46 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Canon EF44.00 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Sigma SA44.00 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Minolta SR43.50 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Canon FD42.00 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Canon FL42.00 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Konica AR40.50 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Four Thirds38.67 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Contax Rangefinder34.85 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Nikon S34.85 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Leica Screw Mount (M39)28.80 AdapterAdapterAdapterAdapterAdapterAdapterAdapterAdapterOptics
Leica M27.80 AdapterAdapterAdapterAdapterAdapterAdapterAdapterThinOptics
Fujifilm G26.70 AdapterAdapterAdapterAdapterAdapterAdapterAdapterNativeOptics
Samsung NX25.50 AdapterAdapterAdapterAdapterAdapterAdapterAdapterOpticsOptics
Canon RF20.00 AdapterAdapterAdapterThinThinNativeThinOpticsOptics
Leica L20.00 AdapterAdapterAdapterThinThinThinNativeOpticsOptics
Micro Four Thirds19.25 AdapterThinThinThinNativeOpticsOpticsOpticsOptics
Hasselblad X18.14 AdapterThinThinNativeOpticsOpticsOpticsOpticsOptics
Canon EF-M18.00 AdapterThinThinOpticsOpticsOpticsOpticsOpticsOptics
Sony E18.00 AdapterThinNativeOpticsOpticsOpticsOpticsOpticsOptics
Fujifilm X17.70 ThinNativeOpticsOpticsOpticsOpticsOpticsOpticsOptics
Nikon 117.00 ThinOpticsOpticsOpticsOpticsOpticsOpticsOpticsOptics
Nikon Z16.00 NativeOpticsOpticsOpticsOpticsOpticsOpticsOpticsOptics

What this does and doesn't tell you

  • It answers focus and framing: whether a plain adapter reaches infinity, and what the sensor does to your field of view.
  • It doesn't promise an adapter is actually manufactured for your pairing. Rare combinations often have none.
  • Electronic contacts, autofocus and aperture control are separate questions. Most adapters for legacy glass are fully manual.
  • On SLR-to-SLR pairings, mirror clearance can stop a lens fitting even when the numbers work.