In depth comparison and review of Pentax K-S1 and Pentax K-3 Mark III. Compare design, sensors, proximity features, memory capacities and other important specifications and features to easily choose the right camera for you. Our goal is to help you uncover differences between the products and find the digital camera that will best fit your needs.
| DESIGN AND DIMENSIONS | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Product Type | Digital camera - 1080p - SLR with Live View mode, movie recording | Digital camera - 4K - SLR with Live View mode, movie recording |
|---|---|---|
| Lens Included | Body only | Body only |
| Height | 9.3 cm | 10.35 cm |
| Width | 12 cm | 13.45 cm |
| Depth | 7 cm | 7.35 cm |
| Weight | 485 g | 735 g |
| Weight Details | - | Camera body only: 735 g Camera with battery and memory card: 820 g |
| Body Material | - | Magnesium alloy |
| Enclosure Colour | White | Black | Black | Silver |
| Protection | - | Weatherproof, dust-resistant |
| Navigation | - | GPS receiver |
| SENSOR | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Sensor Resolution | 20.12 Megapixel | 25.73 Megapixel |
|---|---|---|
| Optical Sensor Type | CMOS | CMOS |
| Total Pixels | 20,420,000 pixels | 26,780,000 pixels |
| Effective Sensor Resolution | 20,120,000 pixels | 25,730,000 pixels |
| Optical Sensor Size | APS-C (23.5 x 15.6 mm) | APS-C (23.3 x 15.5 mm) |
| Frame Rate (Max Resolution) | - | 30 fps |
| Sensor Dust Reduction | Yes | - |
| Sensor Features | Special Protect (SP) coating | Dust Reduction (image sensor vibration), anti-aliasing simulator function |
| Image Stabiliser | - | Optical SR II (5-axis image sensor shift mechanism) |
| Built-in Optical Image Stabiliser | - | Yes |
| Sensors | - | Digital level metre |
| PROCESSOR | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Image Processor | PRIME MII | - |
|---|
| LENS | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Lens Mounting Type | Pentax KAF2 | Pentax K |
|---|
| FOCUSING | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Auto Focus | TTL phase detection | TTL contrast and phase detection |
|---|---|---|
| Auto Focus Points (Zones) Qty | 11 | 101 |
| AE/AF Control | Face-priority AF, Subject-tracking AF | Auto-area AF, Zone AF, Expanded area AF |
| Face Detection | Yes | Yes |
| VIEWFINDER | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Viewfinder Type | Optical - fixed eye-level pentaprism | Optical - fixed eye-level pentaprism |
|---|---|---|
| Optical Viewfinder Field Coverage | 100% | 100% |
| Optical Viewfinder Magnification | 0.95x | 1.05x |
| Optical Viewfinder Dioptric Correction Range | -2.5 to +1.5 | -4 to +1 |
| Features | - | Auto eye sensor |
| EXPOSURE & WHITE BALANCE | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| ISO (Max) | 51200 | 1600000 |
|---|---|---|
| Native ISO | 100-51200 | - |
| Light Sensitivity | ISO 100-51200, ISO auto (100-51200) | ISO auto, ISO 100-1600000 |
| Exposure Metering | Multi-segment, centre-weighted, spot | Multi-segment, centre-weighted, spot, highlight-weighted |
| Exposure Metering Zones | 77 | - |
| Exposure Modes | Programme, automatic, manual, aperture-priority, shutter-priority, shutter & aperture priority | Programme, bulb, automatic, manual, aperture-priority, shutter-priority, ISO priority, shutter & aperture priority |
| Bracketing Modes | - | Depth of field bracketing, motion bracketing |
| Shooting Programs | Landscape, portrait mode, macro, museum, surf & snow, PET, Blue Sky, food, night scene, sunset, candle, night snapshot, night scene with portrait, kids, Stage, night scene HDR, moving object, forest, backlight silhouette | - |
| Special Effects | Natural, bright, Vibrant, monochrome, Muted, landscape, portrait, Cross Process, Bleach Bypass, Radiant, Reversal Film, Tone Expansion, Cold vintage, Colour Fade, Bold Monochrome, Unicolour Bold, Clear Tone, Warm Fade, Brilliant Colour, Infrared Filter | Soft, Slim, fisheye, natural, bright, Vibrant, monochrome, Muted, Flat, landscape, portrait, miniature, Cross Process, Retro, Colour Extract, Toy camera, High contrast, Colour Invert, Bleach Bypass, Radiant, Reversal Film, Shading, Tone Expansion, Bold Monochrome, Unicolour Bold, Colour replace, Grainy Monochrome |
| White Balance | Custom, automatic, presets | Custom, automatic, presets |
| White Balance Presets | Cloudy, tungsten light, Flash, daylight, shade, fluorescent light (cool white), fluorescent light (warm white), Color Temperature Enhancement (CTE), fluorescent light (daylight colour), fluorescent light (daylight white) | Cloudy, tungsten light, daylight, shade, fluorescent light (cool white), fluorescent light (daylight), fluorescent light (warm white), Color Temperature Enhancement (CTE), fluorescent light (daylight white) |
| Shutter Type | Mechanical electronically-controlled | Electronic, mechanical electronically-controlled |
| Max Shutter Speed | 1/6000 sec | 1/8000 sec |
| Min Shutter Speed | 30 sec | 30 sec |
| Exposure Compensation | ±5 EV range, in 1/2 or 1/3 EV steps | ±5 EV range, in 1/2 or 1/3 EV steps |
| White Balance Bracketing | Yes | - |
| X-sync Speed | 1/180 sec | 1/200sec |
| Exposure Range | EV 0-22 (ISO 100) | EV -3-20 (ISO 100) |
| DISPLAY | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Type | 3" LCD display | 3.2" LCD display |
|---|---|---|
| Touch Screen | - | Yes |
| Display Format | 921,000 pixels | 1,620,000 pixels |
| Display Form Factor | Built-in | Built-in |
| Display Features | Colour control, display brightness control | Colour control, contrast control, display brightness control, night vision LCD display |
| FLASH | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Camera Flash | Pop-up flash | - |
|---|---|---|
| Guide Number (m / ISO 100) | 10 | - |
| Flash Modes | Fill-in mode, rear curtain sync, slow synchro, auto mode, flash OFF mode, red-eye reduction | - |
| Red-Eye Reduction | Yes | - |
| Features | AF illuminator, flash +/- compensation | - |
| VIDEOGRAPHY / CAMCORDER | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Digital Video Format | H.264 | H.264, MOV |
|---|---|---|
| Image Recording Format | JPEG, DNG (RAW) + JPEG, DNG (RAW) | JPEG, DNG (RAW), PEF (RAW) |
| Max Video Resolution | 1920 x 1080 | 3840 x 2160 |
| Microphone Operation Mode | Mono | Stereo |
| Microphone Features | Sensitivity control | Wind noise reduction, sensitivity control |
| MEMORY | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Memory Card Slot | SD card | Dual SD card |
|---|---|---|
| Supported Memory Cards | SD Memory Card, SDXC Memory Card, SDHC Memory Card, SDXC UHS-I Memory Card | SD Memory Card, SDXC Memory Card, SDHC Memory Card, SDHC UHS-I Memory Card, SDXC UHS-I Memory Card, SDHC UHS-II Memory Card, SDXC UHS-II Memory Card |
| Memory Card Included | - | No |
| Image Storage | - | RAW 6192 x 4128 JPEG 6192 x 4128 JPEG 4752 x 3168 JPEG 3648 x 2432 JPEG 1920 x 1280 |
| Video Capture | H.264 - 1920 x 1080 - 30 fps H.264 - 1920 x 1080 - 25 fps H.264 - 1920 x 1080 - 24 fps |
H.264 - 3840 x 2160 p - 30 fps H.264 - 3840 x 2160 p - 24 fps H.264 - 1920 x 1080 p - 60 fps H.264 - 1920 x 1080 p - 30 fps H.264 - 1920 x 1080 p - 24 fps |
| BATTERY AND CHARGING | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Battery Type | Pentax D-Li109 Lithium Ion | Pentax D-Li90 Lithium Ion |
|---|---|---|
| Details | Pentax D-Li109 Li-ion rechargeable battery (included) | Pentax D-Li90 Li-ion rechargeable battery (included) |
| Battery Life | Photo shooting - 480 shots (50% flash usage) Playback - 4.5 hours |
Photo shooting - 800 shots Playback - 250 minutes |
| CONNECTIONS | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Interface | HDMI | HDMI, USB-C, IEEE 802.11b/g/n, Bluetooth 4.2 |
|---|---|---|
| Connectivity Features | - | Remote control via mobile devices, remote live view, Wireless Image Transfer |
| Print Standard | DPOF support, Exif Print support | Exif Print support |
| Computer Connectivity | - | Mac, Windows |
| Flash Terminal | Hot shoe | Hot shoe, PC terminal |
| Connector Type | USB 2.0 HDMI output (19 pin micro HDMI Type D) |
USB 3.2 Gen 1 (USB Type-C) HDMI output (19 pin micro HDMI Type D) Microphone (mini-phone stereo 3.5 mm) Headphones (mini-phone stereo 3.5 mm) Remote control (sub-mini phone 2.5 mm) |
| FEATURES | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Self-Timer Delay | 2sec, 12sec | 2sec, 12sec |
|---|---|---|
| Continuous Shooting Speed | 3 frames per second, 5.4 frames per second | 2.5 frames per second, 12 frames per second, 7 frames per second |
| HDR Mode | Auto HDR mode | Auto HDR mode |
| Additional Features | RGB primary colour filter, depth-of-field preview button, digital image rotation, camera orientation detection, histogram display, AE lock, AF lock, cropping an image, resizing an image, saturation control, in-camera film editing, in-camera RAW processing, HDR image enhancement technology, hue control, Eye-Fi Card Ready, LED body illumination | Audio recording, date/time stamp, digital image rotation, camera orientation detection, histogram display, AE lock, AF lock, cropping an image, resizing an image, interval shooting mode, in-camera film editing, in-camera RAW processing, peripheral illumination correction, horizon correction, NR Slow Shutter, High ISO NR, Lens Distortion Correction, primary colour filter, Automatic composition correction function, colour moire correction, Lateral Chromatic Aberration Correction, diffraction correction, Pixel Shift Resolution technology, colour fringe correction, multiple exposure capture, GPS stamp, D-range correction |
| OTHERS | Pentax K-S1 | Pentax K-3 Mark III |
|---|
| Included Accessories | Battery charger, body cap, shoulder strap, eyecup, shoe cap | Eyepiece cover, carrying strap, battery charger, body cap, USB cable, eyecup, shoe cap, sync terminal cover |
|---|---|---|
| Software | Drivers & Utilities | Digital Camera Utility 5 |
| Max Operating Temperature | 40 °C | 40 °C |
| Min Operating Temperature | -10 °C | -10 °C |
| Service & Support | - | Limited warranty - 1 year |
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