Pentax K-S1 vs. Sony Alpha7s III ILCE-7SM3

Camera Comparison, Reviews and Tests

In depth comparison and review of Pentax K-S1 and Sony Alpha7s III ILCE-7SM3. 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.

Camera Specifications Comparison

Pentax K-S1 vs. Sony Alpha7s III ILCE-7SM3 Comparison Chart
DESIGN AND DIMENSIONS Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Product Type Digital camera - 1080p - SLR with Live View mode, movie recording Digital camera - 4K - mirrorless system
Lens Included Body only Body only
Height 9.3 cm 9.69 cm
Width 12 cm 12.89 cm
Depth 7 cm 8.08 cm
Weight 485 g 699 g
Weight Details - Camera with battery and memory card: 699 g
Body Material - Magnesium alloy
Enclosure Colour White | Black -
Protection - Dust-resistant, moisture-resistant
Digital Zoom - 4x
SENSOR Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Sensor Resolution 20.12 Megapixel 12.1 Megapixel
Optical Sensor Type CMOS Exmor R CMOS
Total Pixels 20,420,000 pixels 12,900,000 pixels
Effective Sensor Resolution 20,120,000 pixels 12,100,000 pixels
Optical Sensor Size APS-C (23.5 x 15.6 mm) Full Frame (35.6 x 23.8 mm)
Frame Rate (Max Resolution) - 120 fps
Sensor Dust Reduction Yes Yes
Sensor Features Special Protect (SP) coating Dust Reduction (image sensor vibration), Anti-Dust coating
Image Stabiliser - Optical (5-axis Steady Shot)
Built-in Optical Image Stabiliser - Yes
Sensors - Digital level metre
PROCESSOR Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Image Processor PRIME MII BIONZ XR
LENS Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Lens Mounting Type Pentax KAF2 Sony E-mount
FOCUSING Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Auto Focus TTL phase detection TTL contrast and phase detection
Auto Focus Points (Zones) Qty 11 759
Auto Focus Features - Focus Peaking function, Predictive Focus Control
AE/AF Control Face-priority AF, Subject-tracking AF Flex Focus Point, Face-priority AF, Subject-tracking AF, Eye detection AF
Face Detection Yes Face Recognition, face-priority AF function
VIEWFINDER Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Viewfinder Type Optical - fixed eye-level pentaprism Built-in - electronic
Viewfinder Colour Support - Colour
Viewfinder Diagonal Size - 0.64"
Viewfinder Resolution - 9,437,184 pixels
Optical Viewfinder Field Coverage 100% 100%
Optical Viewfinder Magnification 0.95x 0.9x
Optical Viewfinder Dioptric Correction Range -2.5 to +1.5 -4 to +3
EXPOSURE & WHITE BALANCE Pentax K-S1 Sony Alpha7s III ILCE-7SM3
ISO (Max) 51200 409600
Native ISO 100-51200 -
Extended ISO (Max) - 409600
Extended ISO (Min) - 40
Light Sensitivity ISO 100-51200, ISO auto (100-51200) ISO 204800, ISO 409600, ISO 80-102400, ISO 40
Exposure Metering Multi-segment, centre-weighted, spot Multi-segment, centre-weighted, spot
Exposure Metering Zones 77 1200
Exposure Modes Programme, automatic, manual, aperture-priority, shutter-priority, shutter & aperture priority Bulb, automatic, manual, aperture-priority, shutter-priority
Bracketing Modes - Dynamic Range 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 -
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) Incandescent, fluorescent, cloudy, Flash, daylight, shade, Underwater, 2500K - 9900K
Shutter Type Mechanical electronically-controlled 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
Auto Exposure Bracketing - 3, 5 or 9 steps
White Balance Bracketing Yes -
X-sync Speed 1/180 sec 1/250sec
Exposure Range EV 0-22 (ISO 100) EV -3-20 (ISO 100)
DISPLAY Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Type 3" LCD display 3" LCD display
Touch Screen - Yes
Display Format 921,000 pixels 1,440,000 pixels
Display Form Factor Built-in Folding
Display Features Colour control, display brightness control Display brightness control
FLASH Pentax K-S1 Sony Alpha7s III ILCE-7SM3
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 Sony Alpha7s III ILCE-7SM3
Digital Video Format H.264 H.264, XAVC S, H.265, XAVC HS
Image Recording Format JPEG, DNG (RAW) + JPEG, DNG (RAW) JPEG, RAW, RAW + JPEG
Max Video Resolution 1920 x 1080 3840 x 2160
Audio Signal Format - AAC
Microphone Operation Mode Mono Stereo
Microphone Features Sensitivity control -
MEMORY Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Memory Card Slot SD card Dual SD card, dual CFexpress
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, CFexpress
Memory Card Included - No
Image Storage - JPEG 4240 x 2832
JPEG 2768 x 1848
JPEG 2128 x 1416
JPEG 1376 x 920
JPEG 3776 x 2832
JPEG 2464 x 1848
JPEG 1888 x 1416
JPEG 1232 x 920
JPEG 4240 x 2348
JPEG 2768 x 1550
JPEG 2128 x 1200
JPEG 1376 x 776
JPEG 2832 x 2832
JPEG 1840 x 1840
JPEG 1408 x 1408
JPEG 912 x 912
Video Capture H.264 - 1920 x 1080 - 30 fps
H.264 - 1920 x 1080 - 25 fps
H.264 - 1920 x 1080 - 24 fps
XAVC HS - 3840 x 2160 p - 120 fps
XAVC HS - 3840 x 2160 p - 60 fps
XAVC HS - 3840 x 2160 p - 100 fps - 200Mbps
XAVC HS - 3840 x 2160 p - 50 fps
XAVC HS - 3840 x 2160 p - 24 fps
XAVC S - 3840 x 2160 p - 120 fps
XAVC S - 3840 x 2160 p - 60 fps
XAVC S - 3840 x 2160 p - 30 fps
XAVC S - 3840 x 2160 p - 24 fps
XAVC S - 3840 x 2160 p - 100 fps
XAVC S - 3840 x 2160 p - 50 fps
XAVC S - 3840 x 2160 p - 25 fps
XAVC S HD - 1920 x 1080 p - 120 fps
XAVC S HD - 1920 x 1080 p - 60 fps
XAVC S HD - 1920 x 1080 p - 30 fps
XAVC S HD - 1920 x 1080 p - 24 fps
XAVC S HD - 1920 x 1080 p - 100 fps
XAVC S HD - 1920 x 1080 p - 50 fps
XAVC S HD - 1920 x 1080 p - 25 fps
BATTERY AND CHARGING Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Battery Type Pentax D-Li109 Lithium Ion Sony NP-FZ100 Lithium Ion
Details Pentax D-Li109 Li-ion rechargeable battery (included) Sony NP-FZ100 Li-ion rechargeable battery - 2280 mAh (included)
Battery Life Photo shooting - 480 shots (50% flash usage)
Playback - 4.5 hours
Photo shooting - 510 shots (EVF on)
Photo shooting - 600 shots (LCD Monitor on)
Video recording - 80 minutes (EVF on)
Video recording - 135 minutes (LCD Monitor on)
CONNECTIONS Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Interface HDMI HDMI, USB-C, Wireless LAN, NFC (Near Field Communication), Bluetooth 5.0
Connectivity Features - Remote control via mobile devices, Wireless Image Transfer, PC Remote functions via Wi-Fi
Print Standard DPOF support, Exif Print support Exif Print support, PRINT Image Matching
Flash Terminal Hot shoe Hot shoe
Connector Type USB 2.0
HDMI output (19 pin micro HDMI Type D)
USB (USB Type-C)
HDMI output (19 pin HDMI Type A)
Microphone (mini-phone stereo 3.5 mm)
Headphones (mini-phone stereo 3.5 mm)
FEATURES Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Self-Timer Delay 2sec, 12sec 10 sec, 2sec, 5 sec
Continuous Shooting Speed 3 frames per second, 5.4 frames per second 8 frames per second, 3 frames per second, 10 frames per second, 6 frames per second
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 Built-in speaker, digital image rotation, camera orientation detection, histogram display, shadow point display, interval shooting mode, highlight point display, Dynamic Range Optimizer, USB charging, built-in help guide, Chromatic Aberration Compensation (CAC), HDR image enhancement technology, Intelligent AUTO (iAUTO), fast motion recording, Lens Distortion Compensation (LDC), noise reduction over long exposures, high ISO speed noise reduction, silent shooting, BRAVIA Sync function, PhotoTV HD, GPS via mobile, slow motion recording, peripheral shading correction, anti-flicker, Hybrid Log-Gamma (HLG) recording
OTHERS Pentax K-S1 Sony Alpha7s III ILCE-7SM3
Included Accessories Battery charger, body cap, shoulder strap, eyecup, shoe cap -
Software Drivers & Utilities -
Max Operating Temperature 40 °C 40 °C
Min Operating Temperature -10 °C 0 °C
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