The K mount was introduced by Pentax in 1975 of their K series bodies. It was used by other makers as well. It has the same flange/film distance as the M42 screw mount and was introduced as open standard, meaning that a handful camera makers soon offered variants of their SLR bodies with K-mount, for example Cosina, Chinon and Zenit. The mount standard has been revised and extended several times (e.g. to add autofocus) and remains in use on Pentax's 2015 DSLRs.
Viewing a K-mount lens from the rear (with the focus index mark at 12 o'clock), the aperture stop-down lever is at about 4 o'clock; and between 8 and 10 o'clock is a slider reflecting the current aperture-ring position, to allow for open-aperture light metering. These features are universal to all K-mount lenses. An autofocus KAF lens also adds a drive-screw slot at about 8 o'clock.
In 1983 Pentax introduced the Super Program (Super A), and with it a new series of Pentax-A lenses. These were a modification to the K mount allowing the camera body to set the aperture (e.g. for shutter-priority or programmed autoexposure); and accordingly these add a locking "A" position to the aperture ring. There are also a series of electrical contacts between 4 and 6 o'clock. These lenses remain well-supported by current Pentax DSLRs, i.e. allowing open-aperture metering and correctly recording the selected f/stop into an image's EXIF data.
Unfortunately this KA mount was not the same system chosen by Ricoh to add a P mode to their cameras and lenses. Ricoh-P-compatible lenses have a small protruding pin at about 7 o'clock. (Independent lens makers were able to create K-mount lenses which accommodated either Ricoh or Pentax camera bodies.) There is a serious hazard in attempting to mount any "Ricoh pin" lens on any autofocus K-mount body, as the pin can drop into the focus drive screw and become stuck.
Asahi - Pentax lenses
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 40mm F2.8 XS
- DA 50mm F1.8
- DA* 55mm F1.4 SDM
- DA 70mm F2.4 Limited
- DA* 200mm F2.8 ED [IF] SDM
- DA* 300mm F4 ED [IF] SDM
- DA 560mm F5.6 ED AW
- DA 10-17mm F3.5 ED [IF] Fish-Eye
- DA* 11-18mm F2.8
- 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 18-50mm F4-5.6 DC WR RE
- 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 18-270mm F3.5-6.3 ED SDM
- DA 20-40mm F2.8-4 Limited DC WR
- 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 55-300mm F4.5-6.3 ED PLM WR RE
- DA* 60-250mm F4.0 ED [IF] SDM
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Pentax DA L Series
- DA L 18-50mm F4-5.6 DC WR RE
- DA L 18-55mm F3.5-5.6 AL
- DA L 18-55mm F3.5-5.6 AL WR
- DA L 50-200mm F4-5.6 ED
- DA L 50-200mm F4-5.6 ED WR
- DA L 55-300mm F4-5.8 ED
Pentax D FA Series
- D FA* 50mm F1.4 SDM AW
- D FA 50mm F2.8 Macro
- D FA 100mm F2.8 Macro
- D FA 100mm F2.8 Macro WR
- D FA 15-30mm F2.8 ED SDM WR
- D FA 24-70mm F2.8 ED SDM WR
- D FA 28-105mm F3.5-5.6 ED DC WR
- D FA* 70-200mm F2.8 ED DC AW
- D FA 150-450mm F4.5-5.6 ED DC AW
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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 F1.4
- FA 50mm F1.7
- FA 50mm F2.8 Macro
- 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
Pentax-F Series
- F 28mm F2.8
- F 50mm F1.4
- F 50mm F1.7
- F 50mm F2.8 Macro
- F 85mm F2.8 Soft
- F 100mm F2.8 Macro
- F 135mm F2.8 [IF]
- F* 300mm F4.5 ED [IF]
- F* 600mm F4 ED [IF]
- F 17-28mm F3.5-4.5 Fish-Eye
- F ZOOM 24-50mm F4
- F 28-80mm F3.5-4.5 Macro
- F ZOOM 28-80mm F3.5-4.5
- F ZOOM 35-70mm F3.5-4.5
- F 35-80mm F4-5.6
- F 35-105mm F4-5.6 Macro
- F 35-135mm F3.5-4.5 Macro
- F 70-210mm F4-5.6 ED
- F 70-200mm F4-5.6
- F 80-200mm F4.7-5.6
- F* 250-600mm F5.6 ED [IF]
Asahi Pentax-AF Series
- AF 35-70mm F2.8 (only on Pentax ME-F)
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Optimized for film SLR (MF)
Chinon lenses
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- 24mm F2.5
- 28mm F2.8 Auto MC
- Chinar 28mm F2.8 MC
- 45mm F2.8 Auto
- 50mm F1.4 Auto MC
- 50mm F1.7 Auto
- 50mm F1.9 Auto
- 135mm F2.8 MC
- 200mm F3.3
- 200mm F3.5
- 300mm F5.6
- Makinon 500mm F8 (Mirror)
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- Zoom MC 28-50mm F3.5-4.5
- Zoom 28-70mm F3.5-4.5
- AF 28-70mm F3.5-4
- Zoom 35-70mm F3.5-4.5 MC Macro
- Zoom 35-70mm F2.7-3.5 Auto
- Zoom 35-80mm F3.5-4.9 Auto MC
- Chinar Zoom 35-70mm F3.5-4.5 MC
- AF 70-210mm F4.5
- Chinar Zoom 80-205mm F4.5
- Chinar Zoom 85-210mm F4.5
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Ricoh lenses
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- XR Rikenon Fish-eye 16 mm f/2.8 (8 groups/9 elements)
- XR Rikenon 135 mm f/2.8 (4 groups/4 elements)
- XR Rikenon 200 mm f/4 (5 groups/5 elements)
- XR Rikenon 50 mm f/1.4 (6 groups/7 elements)
- Rikenon P 50 mm f/1.7 (5 groups/6 elements)
- Rikenon P 50 mm f/2 (5 groups/6 elements)
- Rikenon P 28 mm f/2.8 (5 groups/5 elements)
- Rikenon P Zoom 28-70 mm f/3.5–4.5 (8 groups/11 elements)
- Rikenon P Zoom 28–105 mm f/3.5–4.5 (14 groups/14 elements)
- Rikenon P Zoom 35–70 mm f/3.5–4.5 Macro (8 groups/8 elements)
- Rikenon P Zoom 70–210 mm f/4–5.6 (8 groups/12 elements)
- Rikenon P Zoom 60–300 mm f/4–5.6 (9 groups/13 elements)
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Tamron lenses
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- SP AF 14mm F2.8 Asp. [IF]
- SP AF 90mm F2.8 Di Macro 1:1
- SP AF 90mm F2.5 Macro
- SP AF 90mm F2,8 Macro 1:1
- SP AF 90mm F2,8 Macro 1:1 II
- SP AF 300mm F2,8 LD [IF]
- SP AF 10-24mm F3.5-4.5 Di-II LD Asp. [IF]
- SP AF 17-50mm F2.8 XR Di-II LD Asp. [IF]
- SP AF 17-35mm F2.8-4 Di LD Asp. [IF]
- AF 18-250mm F3.5-6.3 Di-II LD Asp. [IF] Macro
- AF 18-200mm F3.5-6.3 XR Di-II LD Asp. [IF] Macro
- SP AF 24-135mm F3.5-5.6 DC Asp. [IF] Macro
- SP AF 28-75mm F2.8 XR Di LD Asp. [IF] Macro
- AF 28-80mm F3.5-5.6 Asp.
- AF 28-80mm F3.5-5.6 Asp. II
- AF 28-105mm F4-5.6 [IF]
- AF 28-105mm F4-5.6 Asp. [IF]
- AF 28-200mm F3.8-5.6 Asp.
- AF 28-200mm F3.8-5.6 LD Asp. [IF]
- AF 28-200mm F3.8-5.6 LD Asp. [IF] II
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- AF 28-200mm F3.8-5.6 LD Asp. [IF] Super
- AF 28-200mm F3.8-5.6 LD Asp. [IF] Super Macro-II
- AF 28-200mm F3.8-5.6 Asp. XR [IF] Super-Zoom Macro
- AF 28-200mm F3.8-5.6 Asp. XR [IF] Super Macro
- AF 28-200mm F3.8-5.6 Di XR Asp. [IF] Macro
- AF 28-300mm F3.5-6.3 LD Asp. [IF] Macro
- AF 28-300mm F3.5-6.3 XR LD Asp. [IF] Ultra-Zoom Macro
- AF 28-300mm F3.5-6.3 Di XR LD Asp. [IF] Macro
- AF 35-90mm F4-5.6
- SP AF 70-200mm F2.8 Di LD [IF] Macro
- AF 70-300mm F4-5.6
- AF 70-300mm F4-5.6 LD
- AF 70-300mm F4-5.6 LD II
- AF 70-300mm F4-5.6 LD Macro
- AF 70-300mm F4-5.6 LD Macro 1:2
- AF 70-300mm F4-5.6 Di LD Macro 1:2
- AF 75-300mm F4-5.6 LD Macro 1:3.9
- AF 80-210mm F4.5-5.6
- AF 80-210mm F4.5-5.6 II
- AF 90-300mm F4.5-5.6
- AF 100-300mm F5-6.3
- AF 100-300mm F5-6.3 Macro
- AF 200-400mm F5,6 LD [IF]
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Tokina lenses
- SL 17mm F3.5
- SL 17mm F3.5 N
- AT-X 17mm F3.5
- SL 24mm F2.8
- SL 24mm F2.8 N
- SL 28mm F2.8
- SL 28mm F2.8 N
- SL 35mm F2.8
- 90mm F2.5 Macro
- AT-X 90mm F2.5 Macro
- EMZ 100mm F3.5 AF [IF] Macro
- SL 135mm F2.8
- SL 200mm F3.5
- AT-X 300mm F2.8 SD
- SL 300mm F5.6
- SL 400mm F5.6
- SL 400mm F5.6 N
- AT-X 400mm F5.6 AF SD
- TM 500mm F8 Mirror
- Tele 600mm F8
- Tele TXP 600mm F8
Brands of cameras with K mount:
Links
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