Pentax K Series K-S1 DSLR Camera
The Pentax K-S1 is a 20MP APS-C DSLR camera — with 1080p video and in-body stabilization. Check GearFocus for current availability, with buyer protection on every purchase.
Pentax K Series K-S1 DSLR Camera
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Overview — Pentax K-S1
Key Features — Pentax K-S1
20MP APS-C CMOS Sensor: Delivers 20 megapixels of resolution (5472x3648) with a 1.5x crop factor, suitable for detailed stills across a wide range of subjects.
Sensor-Shift IBIS: In-body stabilization works with any lens on the Pentax K mount, including older and third-party glass that lacks optical stabilization.
ISO 100–51200 Range: Wide native sensitivity range gives photographers flexibility when shooting in low-light or rapidly changing conditions.
11-Point Phase Detection AF: Autofocus system includes 9 cross-type points for more reliable subject acquisition across a broad area of the frame.
100% Coverage Pentaprism Viewfinder: Optical pentaprism delivers a full, accurate view of the frame — a feature not commonly found at this price level.
5.4 fps Burst Mode: Continuous shooting at up to 5.4 frames per second makes the camera capable for capturing fast-moving subjects.
Specifications — Pentax K-S1
| Spec | Detail |
|---|---|
| Use Cases | Travel, Beginner-Friendly |
| Type | DSLR |
| Sensor | APS-C |
| Resolution | 20MP |
| Processor | PRIME M II |
| ISO Range | 100 – 51200 |
| AF System | Phase Detection |
| AF Points | 11 points (9 cross-type) |
| Max Photo Resolution | 5472x3648 |
| Burst Rate | 5.4 fps |
| Max Video Resolution | 1080p |
| Max Frame Rate | 30fps |
Description — Pentax K-S1
The Pentax K-S1 is a 20MP APS-C DSLR powered by the PRIME M II image processor, offering an ISO range of 100 to 51200 for flexibility in a wide variety of lighting situations. A standout feature for its class is sensor-shift in-body image stabilization (IBIS), which operates independently of the lens — beneficial for anyone shooting with older Pentax K mount glass. The autofocus system delivers 11 phase detection points, 9 of which are cross-type, supporting reliable focus across the frame.
Continuous shooting reaches 5.4 fps in burst mode. The 3.0-inch, 921,000-dot LCD display is paired with an optical pentaprism viewfinder that provides 100% frame coverage. For video, the camera captures 1080p at 30fps in 8-bit.
Connectivity includes built-in Wi-Fi, USB, and a Type D Micro HDMI port. The polycarbonate body weighs 558g and measures 125 x 97 x 74 mm. Storage is supported via SD, SDHC, and SDXC cards.
Note that this model has no weather sealing.
Pros — Pentax K-S1
- ✓Sensor-shift IBIS works with any Pentax K mount lens, as confirmed by imageStabilization.type
- ✓Optical pentaprism viewfinder provides 100% frame coverage, a notable feature at this level
- ✓11-point phase detection AF system with 9 cross-type points for broader subject coverage
Cons — Pentax K-S1
- ✗No weather sealing — bodyDesign.weatherSealing is explicitly listed as 'None'
- ✗Video is limited to 1080p at 30fps with only a Standard color profile available
- ✗No Bluetooth connectivity per connectivity.bluetooth field
Videos — Pentax K-S1
It's About Time! My Pentax K-1 Review After Three Years of Use - Affordable Full Frame Camera — snappiness