The K mount was introduced by Pentax in 1975 of their K series bodies. It was used by other makers as well.
Pentax
Optimized for digital SLR
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Pentax DA Series
- DA 14mm F2.8 ED [IF]
- DA 15mm F4 AL Limited
- DA 21mm F3.2 Limited
- DA 35mm F2.4 AL
- DA 35mm F2.8 Limited Macro
- DA 40mm F2.8 AL Limited
- DA* 55mm F1.4 SDM
- DA 70mm F2.4 Limited
- DA* 200mm F2.8 ED [IF] SDM
- DA* 300mm F4 ED [IF] SDM
- DA 10-17mm F3.5 ED [IF] Fish-Eye
- DA 12-24mm F4 ED AL [IF]
- DA 16-45mm F4 ED AL
- DA* 16-50mm F2.8 ED AL [IF] SDM
- DA 17-70mm F4 AL [IF] SDM
- DA 18-55mm F3.5-5.6 AL
- DA 18-55mm F3.5-5.6 AL II
- DA 18-55mm F3.5-5.6 AL WR
- DA 18-135mm F3.5-5.6 ED [IF] DC WR
- DA 18-250mm F3.5-6.3 ED AL [IF]
- DA* 50-135mm F2.8 ED [IF] SDM
- DA 50-200mm F4-5.6 ED
- DA 50-200mm F4-5.6 ED WR
- DA 55-300mm F4-5.8 ED
- DA* 60-250mm F4.0 ED [IF] SDM
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Pentax DA L Series
- DA L 18-55mm F3.5-5.6 AL
- DA L 50-200mm F4-5.6 ED
- DA L 55-300mm F4-5.8 ED
Pentax D FA Series
- D FA 50mm F2.8 Macro
- D FA 100mm F2.8 Macro
- D FA 100mm F2.8 Macro WR
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Optimized for film SLR (AF)
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Pentax-FA Series
- FA 20mm F2.8
- FA* 24mm F2 AL [IF]
- FA 28mm F2.8 AL
- FA 28mm F2.8 Soft
- FA 31mm F1.8 AL Limited
- FA 35mm F2 AL
- FA 43mm F1.9 Limited
- FA 50mm F2.8 Macro
- FA 50mm F1.4
- FA 50mm F1.7
- FA 77mm F1.8 Limited
- FA* 85mm F1.4 [IF]
- FA 85mm F2.8 Soft
- FA 100mm F2.8 Macro
- FA 100mm F3.5 Macro
- FA 135mm F2.8 [IF]
- FA* 200mm F2.8 ED [IF]
- FA* 200mm F4 Macro ED [IF]
- FA* 300mm F2.8 ED [IF]
- FA* 300mm F4.5 ED [IF]
- FA* 400mm F5.6 ED [IF]
- FA* 600mm F4 ED [IF]
- FA 20-35mm F4 AL
- FA 24-90mm F3.5-4.5 AL [IF]
- FA* 28-70mm F2.8 AL
- FA 28-70mm F4 AL
- FA 28-80mm F3.5-4.7
- FA 28-80mm F3.5-5.6
- FA 28-80mm F3.5-5.6 AL
- FA 28-90mm F3.5-5.6
- FA 28-105mm F4-5.6
- FA 28-105mm F4-5.6 [IF]
- FA 28-105mm F3.2-4.5 AL [IF]
- FA 28-200mm F3.8-5.6 AL [IF]
- FA 35-80mm F4-5.6
- FA* 80-200mm F2.8 ED [IF]
- FA 80-200mm F4.7-5.6
- FA 80-320mm F4.5-5.6
- FA 100-300mm F4.5-5.6
- FA 100-300mm F4.7-5.8
- FA* 250-600mm F5.6 ED [IF]
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Pentax-FA J Series
- FA J 18-35mm F4-5.6 AL
- FA J 28-80mm F3.5-5.6 AL
- FA J 75-300mm F4.5-5.8 AL
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Brands of cameras with K mount: