Pentax K
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Pentax's DSLR mount since 1975: decades of lenses still fit the current bodies, which have stabilisation built in.
Old manual K lenses fit directly.
Cameras
Lenses
Pentax HD D FA 15-30mm f/2.8 ED SDM WR
Pentax HD D FA 24-70mm f/2.8 ED SDM WR
Pentax HD D FA 28-105mm f/3.5-5.6 ED DC WR
Pentax HD D FA* 70-200mm f/2.8 ED DC AW
Pentax HD D FA 70-210mm f/4 ED SDM WR
Pentax HD D FA 150-450mm f/4.5-5.6 ED DC AW
Laowa 12mm f/2.8 Zero-D
Laowa 15mm f/4 Wide Angle Macro
Pentax HD D FA 21mm f/2.4 ED Limited DC WR
Laowa 24mm f/14 2X Macro Probe
Laowa 25mm f/2.8 2.5-5X Ultra Macro
Tamron SP AF 28-75mm f/2.8 XR Di LD Aspherical (IF) Macro
Pentax HD FA 31mm f/1.8 Limited
Pentax HD FA 35mm f/2
Sigma 35mm f/1.4 DG HSM Art
Pentax HD FA 43mm f/1.9 Limited
Pentax HD D FA* 50mm f/1.4 SDM AW
Pentax smc D FA Macro 50mm f/2.8
Pentax smc FA 50mm f/1.4
Laowa 60mm f/2.8 2X Ultra-Macro
Tamron SP AF 70-200mm f/2.8 Di LD (IF) Macro
Tamron AF 70-300mm f/4-5.6 Di LD Macro 1:2
Pentax HD FA 77mm f/1.8 Limited
Pentax HD D FA* 85mm f/1.4 ED SDM AW
Tamron SP AF 90mm f/2.8 Di Macro 1:1
Pentax HD D FA Macro 100mm f/2.8 ED AW
Pentax smc D FA Macro 100mm f/2.8 WR
Laowa 105mm f/2 STF
Pentax HD DA Fish-Eye 10-17mm f/3.5-4.5 EDlike 15-26mm
Tamron SP AF 10-24mm f/3.5-4.5 Di II LD Aspherical (IF)like 15-36mm
Pentax HD DA* 11-18mm f/2.8 ED DC AWlike 16-27mm
Pentax smc DA 12-24mm f/4 ED AL [IF]like 18-36mm
Pentax smc DA 16-45mm f/4 ED ALlike 24-68mm
Pentax HD DA* 16-50mm f/2.8 ED PLM AWlike 24-75mm
Pentax smc DA* 16-50mm f/2.8 ED AL [IF] SDMlike 24-75mm
Pentax HD DA 16-85mm f/3.5-5.6 ED DC WRlike 24-128mm
Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical (IF)like 26-75mm
Pentax smc DA 17-70mm f/4 AL [IF] SDMlike 26-105mm
Sigma 18-35mm f/1.8 DC HSM Artlike 27-52mm
Pentax HD DA 18-50mm f/4-5.6 DC WR RElike 27-75mm
Pentax smc DA 18-55mm f/3.5-5.6 AL WRlike 27-82mm
Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WRlike 27-202mm
Pentax smc DA 18-250mm f/3.5-6.3 ED AL [IF]like 27-375mm
Pentax smc DA 18-270mm f/3.5-6.3 ED SDMlike 27-405mm
Pentax HD DA 20-40mm f/2.8-4 ED Limited DC WRlike 30-60mm
Pentax smc DA* 50-135mm f/2.8 ED [IF] SDMlike 75-202mm
Pentax smc DA 50-200mm f/4-5.6 ED WRlike 75-300mm
Pentax HD DA 55-300mm f/4-5.8 ED WRlike 82-450mm
Pentax HD DA 55-300mm f/4.5-6.3 ED PLM WR RElike 82-450mm
Pentax smc DA* 60-250mm f/4 ED [IF] SDMlike 90-375mm
Pentax smc DA 14mm f/2.8 ED [IF]like 21mm
Pentax HD DA 15mm f/4 ED AL Limitedlike 22mm
Sigma 17-70mm f/2.8-4 DC Macro OS HSM Contemporarylike 26-105mm
Sigma 18-200mm f/3.5-6.3 DC Macro OS HSM Contemporarylike 27-300mm
Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical (IF) Macrolike 27-300mm
Sigma 18-300mm f/3.5-6.3 DC Macro OS HSM Contemporarylike 27-450mm
Pentax HD DA 21mm f/3.2 AL Limitedlike 32mm
Sigma 30mm f/1.4 DC HSM Artlike 45mm
Pentax HD DA 35mm f/2.8 Macro Limitedlike 52mm
Pentax smc DA 35mm f/2.4 ALlike 52mm
Pentax HD DA 40mm f/2.8 Limitedlike 60mm
Pentax smc DA 40mm f/2.8 XSlike 60mm
Pentax smc DA 50mm f/1.8like 75mm
Pentax smc DA* 55mm f/1.4 SDMlike 82mm
Pentax HD DA 70mm f/2.4 Limitedlike 105mm
Pentax smc DA* 200mm f/2.8 ED [IF] SDMlike 300mm
Pentax smc DA* 300mm f/4 ED [IF] SDMlike 450mm
Pentax HD DA 560mm f/5.6 ED AWlike 840mm