-1.46 mm
Space for the adapter
44.00 mm
Canon EF flange
45.46 mm
Pentax K flange
Verdict: No infinity focus — the Canon EF flange is 1.5 mm shorter than the body's, so an adapter would need corrective glass.
What to expect#
Adapters with an optical element exist for some combinations, but they reduce image quality. A glass-free adapter in this direction only works for macro/close focus.
Canon EF lenses you could adapt#
- Canon EF 14mm f/2.8L II USM
- Canon EF 16-35mm f/4L IS USM
- Canon EF 24mm f/1.4L II USM
- Canon EF 50mm f/1.8
- Canon EF 50mm f/1.8 II
- Canon EF 50mm f/1.8 STM
- Canon EF 70-200mm f/2.8L IS II USM
- Laowa 12mm f/2.8 Zero-D
- Laowa 15mm F/4 Wide Angle Macro
- Laowa 60mm f/2.8 2X Ultra-Macro
- Samyang 10mm f/2.8 ED AS NCS CS
- Samyang 12mm f/2.8 Fish-Eye ED AS NCS
- Samyang 135mm f/2 ED UMC
- Samyang 14mm f/2.8 AE ED AS IF UMC
- Samyang 16mm f/2.0 ED AS UMC CS
- Samyang 20mm f/1.8 ED AS UMC
- Samyang 24mm f/1.4 ED AS IF UMC
- Samyang 85mm f/1.4 IF UMC Aspherical
Pentax K cameras#
- Ricoh Pentax KF 2022
- Ricoh Pentax K-3 Mark III 2021
- Pentax K-1 II 2018
- Ricoh Pentax KP 2017
- Ricoh Pentax K-1 2016
- Ricoh Pentax K-70 2016
- Ricoh Pentax K-3 II 2015
- Pentax K-3 2013
- Pentax K-50 2013
- Pentax K-01 2012
- Pentax K-5 II 2012
- Pentax K-30 2012
- Pentax K-5 IIs 2012
- Pentax K-5 2010
- Pentax K-r 2010
- Pentax K-x 2010
- Pentax K200D 2008
- Pentax K20D 2008
Other systems for Canon EF lenses#
Frequently asked questions#
Will Canon EF lenses autofocus on Pentax K?
This adapter direction is not practical.
Does a Canon EF to Pentax K adapter affect image quality?
Any adapter that restores infinity focus here needs a corrective lens, which typically lowers sharpness and adds a slight teleconverter effect.
Last updated October 03, 2026 · How we calculate · Sources