In depth comparison and review of Pentax K-3 Mark III and Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM. 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-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Product Type | Digital camera - 4K - SLR with Live View mode, movie recording | Digital camera - 4K - mirrorless system |
|---|---|---|
| Lens Included | Body only | RF 24-50mm F4.5-6.3 IS STM lens |
| Height | 10.35 cm | 8.61 cm |
| Width | 13.45 cm | 13.25 cm |
| Depth | 7.35 cm | 7 cm |
| Weight | 735 g | 414 g |
| Weight Details | Camera body only: 735 g Camera with battery and memory card: 820 g |
Camera body only: 414 g Camera with battery and memory card: 461 g |
| Body Material | Magnesium alloy | - |
| Enclosure Colour | Black | Silver | Black |
| Protection | Weatherproof, dust-resistant | - |
| Optical Zoom | - | 2x |
| Navigation | GPS receiver | - |
| SENSOR | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Sensor Resolution | 25.73 Megapixel | 24.2 Megapixel |
|---|---|---|
| Optical Sensor Type | CMOS | CMOS |
| Total Pixels | 26,780,000 pixels | 25,600,000 pixels |
| Effective Sensor Resolution | 25,730,000 pixels | 24,200,000 pixels |
| Optical Sensor Size | APS-C (23.3 x 15.5 mm) | Full Frame (36 x 24 mm) |
| Frame Rate (Max Resolution) | 30 fps | 60 fps |
| Sensor Features | Dust Reduction (image sensor vibration), anti-aliasing simulator function | Self Cleaning Sensor Unit |
| Image Stabiliser | Optical SR II (5-axis image sensor shift mechanism) | Optical |
| Built-in Optical Image Stabiliser | Yes | Yes |
| Sensors | Digital level metre | - |
| PROCESSOR | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Image Processor | - | DIGIC X |
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| LENS | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Type | - | Zoom lens - 2x zoom - 24 - 50 mm - f/4.5-6.3 IS STM Canon RF - zoom |
|---|---|---|
| Focus Adjustment | - | Automatic, manual |
| Min Focus Distance | - | 30 cm |
| Max View Angle | - | 84 degree(s) |
| Zoom Adjustment | - | Manual |
| Lens Construction | - | 8 groups / 8 elements |
| Filter Size | - | 58 mm |
| Lens Mounting Type | Pentax K | Canon RF |
| Features | - | Aspherical lens, Stepping Motor (STM) technology, built-in control ring |
| FOCUSING | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Auto Focus | TTL contrast and phase detection | Dual Pixel CMOS AF |
|---|---|---|
| Auto Focus Points (Zones) Qty | 101 | 1053 |
| AE/AF Control | Auto-area AF, Zone AF, Expanded area AF | Face-priority AF, Subject-tracking AF, Eye detection AF, Head Detection AF, Animal detection AF, Vehicle-tracking AF |
| Face Detection | Yes | Eye Detect AF, face-priority AF function |
| VIEWFINDER | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Viewfinder Type | Optical - fixed eye-level pentaprism | Electronic - OLED |
|---|---|---|
| Viewfinder Colour Support | - | Colour |
| Viewfinder Diagonal Size | - | 0.39" |
| Viewfinder Resolution | - | 2,360,000 pixels |
| Optical Viewfinder Field Coverage | 100% | 100% |
| Optical Viewfinder Magnification | 1.05x | 0.70x |
| Optical Viewfinder Dioptric Correction Range | -4 to +1 | -4 to +1 |
| Viewfinder Information | - | Exposure compensation, aperture, white balance, image stabilizer, battery status, highlight tone priority, picture mode, ISO sensitivity, memory card status, AF status, electronic level, maximum burst, shooting mode, drive mode, metering mode |
| Features | Auto eye sensor | - |
| EXPOSURE & WHITE BALANCE | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| ISO (Max) | 1600000 | 204800 |
|---|---|---|
| Native ISO | - | 100-102400 |
| Extended ISO (Max) | - | 204800 |
| Extended ISO (Min) | - | 50 |
| Light Sensitivity | ISO auto, ISO 100-1600000 | ISO 50, ISO 204800, ISO 100-102400 |
| Exposure Metering | Multi-segment, centre-weighted, spot, highlight-weighted | Evaluative, centre-weighted, spot (3%), partial (5.9%) |
| Exposure Metering Zones | - | 384 |
| Exposure Modes | Programme, bulb, automatic, manual, aperture-priority, shutter-priority, ISO priority, shutter & aperture priority | Programme, bulb, automatic, manual, aperture-priority, shutter-priority, E-TTL II program flash, flexible-priority AE, hybrid auto, scene intelligent auto, special scenes, creative filters, custom |
| Bracketing Modes | Depth of field bracketing, motion bracketing | Focus bracketing, white balance bracketing |
| Special Effects | 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 | Neutral, Faithful, monochrome, landscape, portrait, Standard, Fine Detail |
| White Balance | Custom, automatic, presets | Custom, automatic, presets |
| White Balance Presets | Cloudy, tungsten light, daylight, shade, fluorescent light (cool white), fluorescent light (daylight), fluorescent light (warm white), Color Temperature Enhancement (CTE), fluorescent light (daylight white) | Cloudy, tungsten light, Flash, daylight, shade, fluorescent light (white) |
| Shutter Type | Electronic, mechanical electronically-controlled | Electronic, mechanical electronically-controlled |
| Max Shutter Speed | 1/8000 sec | 1/16000 sec |
| Min Shutter Speed | 30 sec | 30 sec |
| Exposure Compensation | ±5 EV range, in 1/2 or 1/3 EV steps | ±3 EV range, in 1/2 or 1/3 EV steps |
| Auto Exposure Bracketing | - | 3 steps in 1/2 or 1/3 EV steps |
| White Balance Bracketing | - | Yes |
| X-sync Speed | 1/200sec | 1/200sec |
| Exposure Range | EV -3-20 (ISO 100) | EV -3-20 (ISO 100) |
| DISPLAY | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Type | 3.2" LCD display | 3" LCD display |
|---|---|---|
| Touch Screen | Yes | Yes |
| Display Format | 1,620,000 pixels | 1,620,000 pixels |
| Display Form Factor | Built-in | Rotating |
| Display Features | Colour control, contrast control, display brightness control, night vision LCD display | Display brightness control |
| VIDEOGRAPHY / CAMCORDER | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Digital Video Format | H.264, MOV | H.264, AVC, HEVC, H.265, MP4 |
|---|---|---|
| Image Recording Format | JPEG, DNG (RAW), PEF (RAW) | JPEG, RAW, C-RAW, HEIF |
| 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, sensitivity control | - |
| MEMORY | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Memory Card Slot | Dual SD card | 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 | SD Memory Card, SDXC Memory Card, SDHC Memory Card, SDHC UHS-II Memory Card, SDXC UHS-II Memory Card |
| Memory Card Included | No | 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 - 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 |
3840 x 2160 - 59.94 fps 3840 x 2160 - 50 fps 3840 x 2160 - 29.97 fps 3840 x 2160 - 25 fps 3840 x 2160 - 23.98 fps 1920 x 1080 - 179.82 fps 1920 x 1080 - 150 fps 1920 x 1080 - 119.9 fps 1920 x 1080 - 100 fps 1920 x 1080 - 59.94 fps 1920 x 1080 - 50 fps 1920 x 1080 - 29.97 fps 1920 x 1080 - 25 fps 1920 x 1080 - 23.98 fps |
| BATTERY AND CHARGING | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Battery Type | Pentax D-Li90 Lithium Ion | Canon LP-E17 Lithium Ion |
|---|---|---|
| Details | Pentax D-Li90 Li-ion rechargeable battery (included) | Canon LP-E17 Li-ion rechargeable battery - 1040 mAh (included) |
| Battery Life | Photo shooting - 800 shots Playback - 250 minutes |
Photo shooting - 370 shots (LCD Monitor on) Photo shooting - 220 shots (viewfinder) |
| CONNECTIONS | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Interface | HDMI, USB-C, IEEE 802.11b/g/n, Bluetooth 4.2 | HDMI, USB 3.2 Gen 2, IEEE 802.11b/g/n, Bluetooth 4.2 |
|---|---|---|
| Connectivity Features | Remote control via mobile devices, remote live view, Wireless Image Transfer | Remote control via mobile devices, Live streaming, wireless video upload to cloud server, wireless image upload to cloud server |
| Print Standard | Exif Print support | DPOF support |
| Computer Connectivity | Mac, Windows | Mac, Windows |
| Flash Terminal | Hot shoe, PC terminal | - |
| Connector Type | 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) |
USB 3.2 Gen 2 (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 (E3) |
| FEATURES | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Self-Timer Delay | 2sec, 12sec | 10 sec, 2sec |
|---|---|---|
| Continuous Shooting Speed | 2.5 frames per second, 12 frames per second, 7 frames per second | - |
| HDR Mode | Auto HDR mode | Moving Subject HDR, HDR PQ |
| Additional Features | 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 | RGB primary colour filter, AE lock, AF lock, Dust Delete Data system, in-camera RAW processing, weatherproof, HDR image enhancement technology, auto white balance, 4K time-lapse movie recording, RAW burst mode, movie digital IS, Canon Log 3, Depth Compositing |
| OTHERS | Pentax K-3 Mark III | Canon EOS R8 + RF 24-50mm F4.5-6.3 IS STM |
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| Included Accessories | Eyepiece cover, carrying strap, battery charger, body cap, USB cable, eyecup, shoe cap, sync terminal cover | Battery charger, dust cap, lens cap, neck strap, battery cover, shoe cap, camera cover |
|---|---|---|
| Software | Digital Camera Utility 5 | Canon EOS Utility |
| Max Operating Temperature | 40 °C | 40 °C |
| Min Operating Temperature | -10 °C | 0 °C |
| Service & Support | Limited warranty - 1 year | - |
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