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Pentax K-01

Pentax · Pentax KAF2 · 1.52× crop

The Pentax K-01 uses the Pentax KAF2 mount with a 1.52× crop factor (about 23.7 × 15.8 mm sensor). Below: equivalent focal lengths, maximum shutter speeds for sharp stars, a hyperfocal distance chart, compatible lenses and how to check the shutter count.

Mount
Pentax KAF2
Crop factor
1.52×
Sensor (approx.)
23.7 × 15.8 mm
Circle of confusion
0.0197 mm

Equivalent focal length & field of view

Lens focal lengthFull-frame equivalentDiagonal FOVHorizontal FOV
8 mm12 mm121.4°112.0°
10 mm15 mm109.9°99.7°
12 mm18 mm99.8°89.3°
14 mm21 mm91.0°80.5°
16 mm24 mm83.3°73.0°
18 mm27 mm76.7°66.7°
20 mm30 mm70.9°61.3°
24 mm37 mm61.4°52.6°
28 mm43 mm53.9°45.9°
35 mm53 mm44.3°37.4°
50 mm76 mm31.8°26.7°
85 mm129 mm19.0°15.9°
135 mm205 mm12.0°10.0°
200 mm304 mm8.1°6.8°
300 mm457 mm5.4°4.5°
400 mm609 mm4.1°3.4°

Multiply by the 1.52× crop factor for the full-frame equivalent field of view.

Milky Way exposure: NPF and 500 rule

Focal lengthNPF @ f/1.8NPF @ f/2.8Strict NPF @ f/2.8500 rule
8 mm22.5 s26.9 s14.5 s41.1 s
10 mm18.0 s21.5 s11.6 s32.9 s
12 mm15.0 s17.9 s9.7 s27.4 s
14 mm12.9 s15.4 s8.3 s23.5 s
16 mm11.2 s13.4 s7.3 s20.5 s
18 mm10.0 s11.9 s6.5 s18.3 s
20 mm9.0 s10.8 s5.9 s16.4 s
24 mm7.5 s9.0 s4.9 s13.7 s
28 mm6.4 s7.7 s4.2 s11.7 s
35 mm5.1 s6.1 s3.4 s9.4 s

NPF = (35 × f-number + 30 × pixel pitch) ÷ focal length, with a pixel pitch of 3.9 µm (typical for this format — exact resolution not in our database). The strict version (Michaud's detailed NPF for the galactic core) gives pin-point stars at 100% view; the 500 rule is a loose rule of thumb that shows trailing on modern sensors.

Hyperfocal distance chart

Focal lengthf/2.8f/5.6f/8f/11f/16
10 mm1.8 m0.9 m0.6 m0.5 m0.3 m
14 mm3.6 m1.8 m1.3 m0.9 m0.6 m
16 mm4.7 m2.3 m1.6 m1.2 m0.8 m
18 mm5.9 m3.0 m2.1 m1.5 m1.0 m
20 mm7.3 m3.6 m2.6 m1.9 m1.3 m
24 mm10 m5.2 m3.7 m2.7 m1.9 m
28 mm14 m7.1 m5.0 m3.6 m2.5 m
35 mm22 m11 m7.8 m5.7 m3.9 m
50 mm45 m23 m16 m12 m8.0 m

Focus at the hyperfocal distance and everything from half that distance to infinity is acceptably sharp (circle of confusion 0.0197 mm). Use the hyperfocal calculator for other settings.

Compatible lenses (190 in our database)

LensFocal lengthMax apertureMount
Pentax smc Pentax-DA Fish-Eye 10-17mm f/3.5-4.5 ED IF10–17 mmf/3.5Pentax KAF2
Pentax HD Pentax-DA* 11-18mm f/2.8 ED DC AW11–18 mmf/2.8Pentax KAF2
Pentax smc Pentax-DA 12-24mm f/4 ED AL IF12–24 mmf/4Pentax KAF2
Pentax smc PENTAX-DA 14mm F2.8 ED[IF]14 mmf/2.8Pentax KAF2
Pentax HD Pentax-D FA 15-30mm f/2.8 ED SDM WR15–30 mmf/2.8Pentax K
Pentax smc Pentax-DA 15mm f/4 ED AL Limited15 mmf/4Pentax KAF2
Pentax smc Pentax-DA 16-45mm f/4 ED AL16–45 mmf/4Pentax KAF2
Pentax HD Pentax-DA 16-85mm f/3.5-5.6 ED DC WR16–85 mmf/3.5Pentax KAF2
Pentax smc Pentax-DA* 16-50mm f/2.8 ED AL IF SDM16–50 mmf/2.8Pentax KAF2
Pentax HD Pentax DA* 16-50mm f/2.8 ED PLM AW16–50 mmf/2.8Pentax KAF2
Pentax smc Pentax-DA 17-70mm f/4 AL [IF] SDM17–70 mmf/4Pentax KAF2
Pentax smc Pentax-DA L 18-50mm f/4-5.6 DC WR RE18–50 mmf/4Pentax KAF3
Pentax smc Pentax-DA 18-135mm f/3.5-5.6 ED AL IF DC WR18–135 mmf/3.5Pentax K
Pentax smc Pentax-DA 18-55mm f/3.5-5.6 AL18–55 mmf/3.5Pentax KAF2
Pentax smc Pentax-DA 18-55mm f/3.5-5.6 AL II/L/WR18–55 mmf/3.5Pentax KAF2
Pentax smc Pentax-DA 18-250mm f/3.5-6.3 ED AL [IF]18–250 mmf/3.5Pentax KAF2
Pentax HD Pentax-DA 18-50mm f/4-5.6 DC WR RE18–50 mmf/4Pentax KAF2
Pentax HD Pentax-DA 20-40mm f/2.8-4 ED Limited DC WR20–40 mmf/2.8Pentax KAF2
Pentax HD Pentax-DA 21mm f/3.2 ED AL Limited21 mmf/3.2Pentax KAF2
Pentax smc Pentax-DA 21mm f/3.2 AL Limited21 mmf/3.2Pentax KAF2
Pentax HD PENTAX-D FA 21mm F2.4 ED Limited DC WR21 mmf/2.4Pentax KAF4
Pentax HD Pentax-D FA 24-70mm f/2.8 ED SDM WR24–70 mmf/2.8Pentax KAF3
Pentax HD Pentax-D FA 28-105mm f/3.5-5.6 ED DC WR28–105 mmf/3.5Pentax KAF3
Pentax smc Pentax-A 28mm 1:2.828 mmf/2.8Pentax KA
Pentax smc Pentax-FA 28-70mm f/4 AL28–70 mmf/4Pentax KAF
Pentax smc Pentax-F 28mm f/2.828 mmf/28Pentax KAF
Pentax smc Pentax-M 28mm 1:3.528 mm—Pentax K
Pentax smc Pentax-M 28mm f/2.828 mmf/2.8Pentax K
Pentax-F 28-80mm f/3.5-4.528–80 mmf/28Pentax KAF2
Pentax smc Pentax-FA 28mm f/2.8 AL28 mmf/2.8Pentax KAF2
Pentax smc Pentax K 30mm f/2.830 mmf/2.8Pentax K
Pentax smc Pentax-FA 31mm f/1.8 AL Limited31 mmf/1.8Pentax KAF2
Pentax smc Pentax-DA 35mm f/2.8 Macro Limited35 mmf/2.8Pentax KAF3
Pentax smc Pentax-M 35mm 1:235 mm—Pentax K
Pentax smc Pentax-F ZOOM 35-70mm f/3.5-4.535–70 mmf/3.5Pentax K
Pentax smc Pentax-DA 35mm f/2.4 AL35 mmf/2.4Pentax KAF2
Pentax smc Pentax-F 35-80mm f/4-5.635–80 mmf/35Pentax KAF2
Pentax smc Pentax-DA 40mm f/2.8 Limited40 mmf/2.8Pentax KAF2
Pentax smc Pentax-DA 40mm f/2.8 XS40 mmf/2.8Pentax KAF2
Pentax smc Pentax-FA 43mm f/1.9 Limited43 mmf/1.9Pentax KAF2

Native and adapter-free compatible lenses from the Lensfun database. Third-party and adapted lenses may also work.

How to check the Pentax K-01 shutter count

Pentax and Ricoh DSLRs store the count in MakerNotes; ExifTool decodes it with `exiftool -ShutterCount image.dng`.

ExifTool tag: ShutterCount. Always test an original, unedited file straight from the card.

Where to buy

Compare new and used prices at these retailers:

B&H PhotoAmazonKEH (used)MPB (used)

Other Pentax KAF2 cameras

FAQ

What is the crop factor of the Pentax K-01?
1.52×. A 24 mm lens frames like a 37 mm lens on full frame.
What shutter speed should I use for the Milky Way with the Pentax K-01?
With a 8 mm lens at f/2.8, about 27 seconds keeps stars sharp (NPF rule).
How do I check the shutter count on the Pentax K-01?
Pentax and Ricoh DSLRs store the count in MakerNotes; ExifTool decodes it with `exiftool -ShutterCount image.dng`.
Which lenses fit the Pentax K-01?
Lenses for the Pentax KAF2 mount and compatible mounts (Pentax K, Pentax KA, Pentax KAF) — 190 are listed above.