Sony Alpha 7R III vs Pentax K-3 Mark III Monochrome

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      Specifications

      General Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      BrandSonyPentax
      ModelAlpha 7R IIIK-3 Mark III Monochrome
      Predecessor ModelSony Alpha 7R II
      Successor ModelSony Alpha 7R IV
      MSRP$3199 (body only)$2199 (body only)
      Camera TypeInterchangeable LensInterchangeable Lens
      Body TypeMirrorlessDSLR
      Video Capture
      Sensor Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Sensor TypeBSI-CMOSCMOS
      Sensor SizeFull FrameAPS-C
      Sensor Dimensions35.9 x 24 mm23.3 x 15.5 mm
      Total Pixels43.6 Megapixel26.78 Megapixel
      Effective Pixels42.4 Megapixel25.73 Megapixel
      Low Pass Filter
      Native ISO Range100 - 32,000200 - 1,600,000
      Boosted ISO Range50 - 102,400
      Sensor Shift High Resolution Mode
      Photo Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      ProcessorBIONZ XPRIME V
      Max Image Resolution7952 x 53046192 x 4128
      Image Aspect Ratios3:2, 16:93:2
      Image File FormatJPEG, RAWDNG, JPEG, RAW
      JPEG Quality LevelsExtra fine, fine, standardBest, better, good
      Bit Depth14-Bit14-Bit
      Color SpacesRGB, Adobe RGB
      Timelapse Recording
      White BalancePresets: Auto, Cloudy, Color Temperature, Custom, Daylight, Flash, Fluorescent (Cool White), Fluorescent (Daylight), Fluorescent (Warm White), Incandescent, Shade, UnderwaterPresets: Auto, CTE, Cloudy, Color Temperature, Daylight, Fluorescent (Cool White), Fluorescent (Day White), Fluorescent (Daylight), Fluorescent (Warm White), Manual, Multi Auto WB, Shade, Tungsten
      Focus Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Focusing SystemFast Hybrid AF (Phase-detection / Contrast-detection)
      Autofocus ModesMulti-area
      Center
      Selective single-point
      Tracking
      Single
      Continuous
      Touch
      Face Detection
      Live View      		Multi-area
      Center
      Selective single-point
      Tracking
      Single
      Continuous
      Touch
      Face Detection
      Live View
      Lens ServoAutomatic, Continuous-Servo AF, Direct Manual Focus, Manual Focus, Single-Servo AFContinuous-Servo AF, Manual Focus, Single-Servo AF
      AF Detection Range-2 to +20 EV-3 to +19 EV
      Number of Focus Points425101
      Number of Cross-type Focus Points25
      Touch-to-Focus
      Live View Autofocus
      Animal Eye Detection
      Vehicle Tracking Mode
      Insect Tracking Mode
      Contrast Detection for Autofocus
      Phase Detection for Autofocus
      Focusing ScreenNatural-Bright-Matte III focusing screen
      Optics Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Lens MountSony EPentax KAF2
      Crop Factor1x1.5x
      Image Stabilization5-Axis Sensor ShiftSensor Shift
      Image Stabilization Compensation5.5 stops5.5 stops
      Digital Image Stabilization
      Screen Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Screen TypeTiltingFixed
      Screen TechnologyTFT LCDTFT LCD
      Touch Screen
      Screen Size3.0"3.2"
      Screen Resolution1,440k dot1,620k dot
      Top LCD Screen
      Live View
      Live Composition
      Viewfinder Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      ViewfinderElectronicOptical (pentaprism)
      Viewfinder Size0.5"
      Viewfinder Coverage100%100%
      Viewfinder Magnification0.78x1.05x
      Viewfinder Magnification (35mm equivalent)0.78x0.70x
      Viewfinder Resolution3,686k dot
      Viewfinder Eyepoint23 mm20.5 mm
      Diopter Adjustment-4 to +3-4 to +1
      Shutter Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Shutter TypeElectronicElectronic
      Min Shutter Speed30 sec30 sec
      Max Shutter Speed (Mechanical or 1st Curtain)1/8000 sec1/8000 sec
      Max Shutter Speed (Electronic)1/16000 sec
      Max Continuous Shooting10.0 fps12.0 fps
      Continuous Shooting Resolution/fps/bufferUp to 10 fps at 42.4 MP for up to 76 Frames (Raw) / 76 Frames (JPEG)
      Up to 8 fps at 42.4 MP for up to 76 Frames (Raw) / 76 Frames (JPEG)
      Up to 6 fps at 42.4 MP for up to 76 Frames (Raw) / 76 Frames (JPEG)
      Up to 3 fps at 42.4 MP for up to 76 Frames (Raw) / 76 Frames (JPEG)      		Mechanical Shutter
      Up to 12 fps at 25.7 MP for up to 55 Frames (JPEG) / 32 Frames (Raw)
      Mechanical Shutter
      Up to 7 fps at 25.7 MP for up to 100 Frames (JPEG) / 40 Frames (Raw)
      Mechanical Shutter
      Up to 2.5 fps at 25.7 MP for up to 100 Frames (JPEG) / 100 Frames (Raw)
      Flash Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Built-in Flash
      Flash ModesOff
      Auto
      Fill-flash
      Slow Sync
      Rear Sync
      Red-eye reduction
      Wireless
      Hi-speed sync      		Auto
      Auto + Red-eye Reduction
      Flash On
      Flash On + Red-eye Reduction
      Slow- speed Sync
      Slow-speed Sync + Red-eye
      P-TTL
      Contrast-control-sync
      High-speed sync
      Wireless sync
      Max Flash Sync Speed1/250 sec1/200 sec
      Flash Compensation-3 to +3 EV (1/3, 1/2 EV Steps)-2 to +1 EV
      External Flash Connectivity
      External Flash SystemTTLP-TTL
      External Flash ConnectionIntelligent Hot Shoe, PC TerminalHot Shoe, PC Terminal
      Exposure Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Exposure Metering ModesMulti
      Center-weighted
      Spot      		Multi
      Center-weighted
      Highlight-weighted
      Spot
      Exposure ModesAperture Priority, Auto, Manual, Program, Shutter PriorityAperture Priority, Auto, Manual, Program, Sensitivity Priority, Shutter Priority
      Metering Range-3 to +20 EV-2 to +21 EV
      Exposure Compensation±5 EV (1/3 EV, 1/2 EV increments)±5 EV (1/3 EV, 1/2 EV increments)
      Exposure Bracketing ±5 EV (3, 5 shots at 1/3 EV, 1/2 EV, 2/3 EV, 1 EV, 2 EV increments) ±5 EV (2, 3, 5 shots at 1/3 EV, 1/2 EV increments)
      Exposure LockButton type (timer type: two times the meter operating time set in Custom Setting); Continuous as long as the shutter button is halfway pressed
      DXO Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      DxO Low Light ISO3523
      DxO Color Depth26.0
      DxO Dynamic Range14.7
      DxO Overall Score100
      Video Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Internal Recording ModesXAVC S
      4K UHD: 3840 x 2160 @ 23.98/25/29.97 fps [60 to 100 Mbps]
      Full HD: 1920 x 1080p @ 23.98/25/29.97/50/59.94/100 fps [100 Mbps]
      HD: 1280 x 720 @ 100 fps [50 Mbps]
      AVCHD
      Full HD: 1920 x 1080p @ 23.98/25/50/59.94 fps [17 to 28 Mbps]
      Full HD: 1920 x 1080i @ 50/59.94 fps [17 to 24 Mbps]
      MP4
      Full HD: 1920 x 1080p @ 25/29.97/50/59.94 fps [16 to 28 Mbps]
      HD: 1280 x 720 @ 25/29.97 fps [6 Mbps]      		H.264/MOV
      4K UHD: 3840 x 2160 @ 24/30.00 fps
      Full HD: 1920 x 1080p @ 24/30.00/60.00 fps
      Interval Recording
      Video FormatsMPEG-4, AVCHD, XAVC SMPEG-4, H.264
      Max Video Resolution3840 x 21603840 x 2160
      External Recording Modes4:2:2 8-Bit via HDMI
      UHD 4K (3840 x 2160) @ 23.98/24.00/25/29.97 fps
      1920 x 1080p @ 23.98/24.00/50/59.94 fps
      1920 x 1080i @ 50/59.94 fps
      Webcam Functionality
      Gamma CurveHDR-HLG, Sony S-Log 2, Sony S-Log 3
      Unlimited Video Recording
      Recording Limit30 min25 min
      Terminals Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Audio I/O1 x 1/8" / 3.5 mm TRS Stereo Headphone Output
      1 x 1/8" / 3.5 mm TRS Stereo Microphone Input      		1 x 1/8" / 3.5 mm TRS Stereo Headphone Output
      1 x 1/8" / 3.5 mm TRS Stereo Microphone Input
      Power I/O1 x USB-C Input/Output1 x USB-C Input/Output
      Other I/O1 x Sony Multi/Micro-USB Input/Output (Shared with Remote Input)
      1 x USB-C (USB 3.2 / 3.1 Gen 1) Input/Output (Shared with Power Input)
      1 x PC Sync Socket Output      		1 x USB-C (USB 3.2 / 3.1 Gen 1) Data Input/Output (Shared with Power Input)
      1 x 2.5 mm Sub-Mini Control Input
      1 x PC Sync Socket Output
      USB SpeedUSB 3.2 Gen 1x1 (5 GBit/sec)USB 3.2 Gen 1x1 (5 GBit/sec)
      HDMI Output Micro Micro
      SpeakerMonoMono
      Built-in MicrophoneStereoStereo
      Microphone Input
      Headphone Output
      Flash Sync Port
      Connectivity Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Built-in GPS
      Built-In Wi-Fi
      Wi-Fi Version802.11b/g/n, 2.4 GHz802.11b/g/n, 2.4 GHz
      Built-In Bluetooth
      NFC
      Mobile App Compatible *As of April, 2023: Check with manufacturer for the most up-to-date compatibility
      Remote Control wired, wireless, smartphone via wireless
      Environmental Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Environmental Sealing
      Operating Temperature32 to 104°F / 0 to 40°C22 to 72°F / -10 to 40°C
      Operating Humidity0 to 85%
      Physical Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Dimensions127 x 96 x 74 mm (5 x 3.78 x 2.91")135 x 104 x 74 mm (5.31 x 4.09 x 2.91")
      Weight (inc. batteries)657 g (1.45 lb / 23.17 oz)820 g (1.81 lb / 28.92 oz)
      Box Dimensions (LxWxH)9.6 x 6.1 x 5.7"8.3 x 6.9 x 5.1"
      Package Weight3.005 lb3.045 lb
      Power and Storage Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Battery PackNP-FZ100D-LI90
      Battery Life650 shots800 shots
      USB Charging
      Internal Storage
      External StorageSlot 1: SD/SDHC/SDXC (UHS-II)
      Slot 2: SD/SDHC/SDXC/Memory Stick Duo Hybrid (UHS-I)      		Slot 1: SD/SDHC/SDXC (UHS-II)
      Slot 2: SD/SDHC/SDXC (UHS-I)
      Other Sony Alpha 7R III Pentax K-3 Mark III Monochrome
      Self Timer 2 or 10 sec; continuous 3 or 5 exposures
      Orientation Sensor
      Tripod Mounting Thread1 x 1/4"-20 Female (Bottom)1 x 1/4"-20 Female (Bottom)
      Accessory Mount1 x Hot Shoe Mount1 x Hot Shoe Mount
      Material of ConstructionMagnesium AlloyMagnesium Alloy
      Electronic Level Gauge


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