In depth comparison and review of Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS 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 | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Product Type | Digital camera - 4K - mirrorless system | Digital camera - 4K - SLR with Live View mode, movie recording |
|---|---|---|
| Lens Included | FE 28-70mm OSS lens | Body only |
| Height | 9.64 cm | 10.35 cm |
| Width | 13.13 cm | 13.45 cm |
| Depth | 7.98 cm | 7.35 cm |
| Weight | 658 g | 735 g |
| Weight Details | Camera with battery and memory card: 658 g | Camera body only: 735 g Camera with battery and memory card: 820 g |
| Body Material | Magnesium alloy | Magnesium alloy |
| Enclosure Colour | - | Black | Silver |
| Protection | Dust-resistant, moisture-resistant | Weatherproof, dust-resistant |
| Digital Zoom | 4x | - |
| Navigation | - | GPS receiver |
| SENSOR | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Sensor Resolution | 33.0 Megapixel | 25.73 Megapixel |
|---|---|---|
| Optical Sensor Type | Exmor R CMOS | CMOS |
| Total Pixels | 34,100,000 pixels | 26,780,000 pixels |
| Effective Sensor Resolution | 33,000,000 pixels | 25,730,000 pixels |
| Optical Sensor Size | Full Frame (35.9 x 23.9 mm) | APS-C (23.3 x 15.5 mm) |
| Frame Rate (Max Resolution) | 60 fps | 30 fps |
| Sensor Dust Reduction | Yes | - |
| Sensor Features | Dust Reduction (image sensor vibration), Anti-Dust coating | Dust Reduction (image sensor vibration), anti-aliasing simulator function |
| Image Stabiliser | Optical (Steady Shot with 5-axis Intelligent Active Mode) | Optical SR II (5-axis image sensor shift mechanism) |
| Built-in Optical Image Stabiliser | Yes | Yes |
| Sensors | Digital level metre | Digital level metre |
| PROCESSOR | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Image Processor | BIONZ XR | - |
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| LENS | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Type | Zoom lens 28 - 70 mm - f/3.5-5.6 FE OSS - zoom | - |
|---|---|---|
| Focus Adjustment | Automatic, manual | - |
| Min Focus Distance | 30 cm | - |
| Max View Angle | 75 degree(s) | - |
| Zoom Adjustment | Manual | - |
| Lens Construction | 8 groups / 9 elements | - |
| Filter Size | 55 mm | - |
| Lens Mounting Type | Sony E-mount | Pentax K |
| Features | Internal focusing system, full-time manual focusing, ED glass, splashproof, aspherical lens, dustproof | - |
| FOCUSING | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Auto Focus | TTL contrast and phase detection | TTL contrast and phase detection |
|---|---|---|
| Auto Focus Points (Zones) Qty | 759 | 101 |
| Auto Focus Features | Focus Peaking function, Predictive Focus Control | - |
| AE/AF Control | Face-priority AF, Subject-tracking AF, Touch Area AF, Zone AF, Real-time Eye AF, Real-time Tracking AF, Wide-area AF, Expanded area AF, animal eye detection, bird eye detection, right/left eye select | Auto-area AF, Zone AF, Expanded area AF |
| Face Detection | Eye Detect AF, face-priority AF function | Yes |
| VIEWFINDER | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Viewfinder Type | Electronic - OLED | Optical - fixed eye-level pentaprism |
|---|---|---|
| Viewfinder Colour Support | Colour | - |
| Viewfinder Diagonal Size | 0.5" | - |
| Viewfinder Resolution | 3,686,400 pixels | - |
| Optical Viewfinder Field Coverage | 100% | 100% |
| Optical Viewfinder Magnification | 0.78x | 1.05x |
| Optical Viewfinder Dioptric Correction Range | -4 to +3 | -4 to +1 |
| Features | - | Auto eye sensor |
| EXPOSURE & WHITE BALANCE | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| ISO (Max) | 204800 | 1600000 |
|---|---|---|
| Native ISO | 100-51200 | - |
| Extended ISO (Max) | 204800 | - |
| Extended ISO (Min) | 50 | - |
| Light Sensitivity | ISO 50, ISO auto, ISO 204800, ISO 100-51200 | ISO auto, ISO 100-1600000 |
| Exposure Metering | Multi-segment, centre-weighted, average, highlight spot | Multi-segment, centre-weighted, spot, highlight-weighted |
| Exposure Metering Zones | 1200 | - |
| Exposure Modes | Automatic, manual, aperture-priority, shutter-priority | Programme, bulb, automatic, manual, aperture-priority, shutter-priority, ISO priority, shutter & aperture priority |
| Bracketing Modes | Dynamic Range Bracketing, white balance bracketing | Depth of field bracketing, motion bracketing |
| Special Effects | Soft Skin, Creative Look presets | 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 | Incandescent, fluorescent, cloudy, Flash, daylight, shade, Underwater, 2500K - 9900K | 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 | 1/8000 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 | - |
| X-sync Speed | 1/250sec | 1/200sec |
| Exposure Range | EV -3-20 (ISO 100) | EV -3-20 (ISO 100) |
| DISPLAY | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Type | 3" LCD display | 3.2" LCD display |
|---|---|---|
| Touch Screen | Yes | Yes |
| Display Format | 1,036,000 pixels | 1,620,000 pixels |
| Display Form Factor | Folding | Built-in |
| Display Features | Display brightness control | Colour control, contrast control, display brightness control, night vision LCD display |
| VIDEOGRAPHY / CAMCORDER | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Digital Video Format | MPEG-4, H.264, XAVC S, H.265, XAVC HS | H.264, MOV |
|---|---|---|
| Image Recording Format | JPEG, RAW, RAW + JPEG, HEIF, RAW + HEIF | JPEG, DNG (RAW), PEF (RAW) |
| Max Video Resolution | 3840 x 2160 | 3840 x 2160 |
| Audio Signal Format | Linear PCM, AAC | - |
| Microphone Operation Mode | Stereo | Stereo |
| Microphone Features | Wind noise reduction | Wind noise reduction, sensitivity control |
| MEMORY | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Memory Card Slot | SD card, CFexpress / SD card | Dual SD card |
|---|---|---|
| Supported Memory Cards | 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 | 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 | 7008 x 4672 4608 x 3072 3504 x 2336 4608 x 3072 - APS-C mode 3504 x 2336 - APS-C mode 6224 x 4672 4096 x 3072 3120 x 2336 4096 x 3072 - APS-C mode 3120 x 2336 - APS-C mode 7008 x 3944 4608 x 2592 3504 x 1968 4608 x 2592 - APS-C mode 3504 x 1968 - APS-C mode 4672 x 4672 3072 x 3072 2336 x 2336 3072 x 3072 - APS-C mode 2336 x 2336 - APS-C mode |
RAW 6192 x 4128 JPEG 6192 x 4128 JPEG 4752 x 3168 JPEG 3648 x 2432 JPEG 1920 x 1280 |
| Video Capture | XAVC HS - 3840 x 2160 p - 60 fps XAVC HS - 3840 x 2160 p - 24 fps XAVC HS - 3840 x 2160 p - 50 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 - 50 fps XAVC S - 3840 x 2160 p - 25 fps XAVC S - 1920 x 1080 p - 60 fps XAVC S - 1920 x 1080 p - 30 fps XAVC S - 1920 x 1080 p - 24 fps XAVC S - 1920 x 1080 p - 50 fps XAVC S - 1920 x 1080 p - 25 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 | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Battery Type | Sony NP-FZ100 Lithium Ion | Pentax D-Li90 Lithium Ion |
|---|---|---|
| Details | Sony NP-FZ100 Li-ion rechargeable battery - 2280 mAh (included) | Pentax D-Li90 Li-ion rechargeable battery (included) |
| Battery Life | Photo shooting - 520 shots (EVF on) Photo shooting - 580 shots (LCD Monitor on) Video recording - 100 minutes (EVF on) Video recording - 110 minutes (LCD Monitor on) |
Photo shooting - 800 shots Playback - 250 minutes |
| CONNECTIONS | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Interface | USB 2.0, USB-C, IEEE 802.11a/b/g/n/ac, Bluetooth 4.1 | HDMI, USB-C, IEEE 802.11b/g/n, Bluetooth 4.2 |
|---|---|---|
| Connectivity Features | Remote control via mobile devices, remote live view, Wireless Image Transfer, wireless video upload to FTP server, PC Remote functions via Wi-Fi | Remote control via mobile devices, remote live view, Wireless Image Transfer |
| Print Standard | Exif Print support, PRINT Image Matching | Exif Print support |
| Computer Connectivity | - | Mac, Windows |
| Flash Terminal | Hot shoe | Hot shoe, PC terminal |
| Connector Type | USB 2.0 (5 pin Micro-USB Type B) USB 3.2 Gen 1 (USB Type-C) Microphone (mini-phone stereo 3.5 mm) Headphones (mini-phone stereo 3.5 mm) |
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 | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Self-Timer Delay | 10 sec, 2sec, 5 sec | 2sec, 12sec |
|---|---|---|
| Continuous Shooting Speed | 8 frames per second, 3 frames per second, 10 frames per second, 6 frames per second | 2.5 frames per second, 12 frames per second, 7 frames per second |
| HDR Mode | - | Auto HDR mode |
| Additional Features | Built-in speaker, camera orientation detection, histogram display, shadow point display, highlight point display, Dynamic Range Optimizer, USB charging, Intelligent AUTO (iAUTO), fast motion recording, noise reduction over long exposures, high ISO speed noise reduction, silent shooting, BRAVIA Sync function, distortion correction function, S-Log2 gamma setting, slow motion recording, peripheral shading correction, chromatic aberration correction, anti-flicker, Hybrid Log-Gamma (HLG) recording, S-Log3 gamma setting, 4:2:2 10-bit internal rercording, simultaneous streaming & recording mode, focus breathing compensation, USB streaming, 14-bit RAW | 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 | Sony Alpha7 IV ILCE-7M4K + FE 28-70mm OSS | Pentax K-3 Mark III |
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| Included Accessories | Eyepiece cover, lens hood, dust cap, body cap, lens cap, shoulder strap, AC power adaptor, shoe cap, USB-C to USB-A cable | Eyepiece cover, carrying strap, battery charger, body cap, USB cable, eyecup, shoe cap, sync terminal cover |
|---|---|---|
| Software | - | Digital Camera Utility 5 |
| Max Operating Temperature | 40 °C | 40 °C |
| Min Operating Temperature | 0 °C | -10 °C |
| Service & Support | - | Limited warranty - 1 year |
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