Sony Alpha 7R IIIA vs Pentax 645D

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      Specifications

      General Sony Alpha 7R IIIA Pentax 645D
      BrandSonyPentax
      ModelAlpha 7R IIIA645D
      Predecessor ModelSony Alpha 7R II
      Successor ModelSony Alpha 7R IV Pentax 645Z
      MSRP$3199 (body only)
      Camera TypeInterchangeable LensInterchangeable Lens
      Body TypeMirrorlessDSLR
      Video Capture
      Sensor Sony Alpha 7R IIIA Pentax 645D
      Sensor TypeBSI-CMOSCCD
      Sensor SizeFull FrameMedium format
      Sensor Dimensions35.9 x 24 mm44 x 33 mm
      Total Pixels43.6 Megapixel40 Megapixel
      Effective Pixels42.4 Megapixel40 Megapixel
      Low Pass Filter
      Native ISO Range100 - 32,000200 - 1,600
      Boosted ISO Range50 - 102,400100 - 1,600
      Photo Sony Alpha 7R IIIA Pentax 645D
      ProcessorBIONZ XPRIME II
      Max Image Resolution7952 x 53047264 x 5440
      Image Aspect Ratios3:2, 16:94:3
      Image File FormatJPEG, RAW
      JPEG Quality LevelsExtra fine, fine, standardGood, Better, Best
      Bit Depth14-Bit14-Bit
      Timelapse Recording
      White BalancePresets: Auto, Cloudy, Color Temperature, Custom, Daylight, Flash, Fluorescent (Cool White), Fluorescent (Daylight), Fluorescent (Warm White), Incandescent, Shade, UnderwaterAuto preset modes: Auto, Daylight, Shade, Cloudy, Fluorescent (D, N, W, L), Tungsten, Flash, CTE
      Manual mode(s): Yes, manual and 3 color temperature selections available>br> WB fine adjustment available in all modes
      Focus Sony Alpha 7R IIIA Pentax 645D
      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
      Selective single-point
      Single
      Continuous
      Live View
      Lens ServoAutomatic, Continuous-Servo AF, Direct Manual Focus, Manual Focus, Single-Servo AF
      AF Detection Range-2 to +20 EV
      Number of Focus Points42511
      Touch-to-Focus
      Live View Autofocus
      Animal Eye Detection
      Vehicle Tracking Mode
      Insect Tracking Mode
      Contrast Detection for Autofocus
      Phase Detection for Autofocus
      Optics Sony Alpha 7R IIIA Pentax 645D
      Lens MountSony EPentax 645AF2
      Crop Factor1x0.79x
      Image Stabilization5-Axis Sensor Shift
      Image Stabilization Compensation5.5 stops
      Digital Image Stabilization
      Screen Sony Alpha 7R IIIA Pentax 645D
      Screen TypeTiltingFixed
      Screen TechnologyTFT LCDTFT Color LCD with wide-viewing angle and with AR coating
      Touch Screen
      Screen Size3.0"3.0"
      Screen Resolution2,360k dot921k dot
      Top LCD Screen
      Live View
      Live Composition
      Viewfinder Sony Alpha 7R IIIA Pentax 645D
      ViewfinderElectronicOptical (pentaprism)
      Viewfinder Size0.5"
      Viewfinder Coverage100%98%
      Viewfinder Magnification0.78x0.56x
      Viewfinder Magnification (35mm equivalent)0.78x0.71x
      Viewfinder Resolution3,686k dot
      Viewfinder Eyepoint23 mm
      Diopter Adjustment-4 to +3
      Shutter Sony Alpha 7R IIIA Pentax 645D
      Shutter TypeElectronic
      Min Shutter Speed30 sec30 sec
      Max Shutter Speed (Mechanical or 1st Curtain)1/8000 sec1/4000 sec
      Max Continuous Shooting10.0 fps1.1 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)
      Flash Sony Alpha 7R IIIA Pentax 645D
      Built-in Flash
      Flash ModesOff
      Auto
      Fill-flash
      Slow Sync
      Rear Sync
      Red-eye reduction
      Wireless
      Hi-speed sync      		Auto
      On
      Off
      Red-eye
      Slow Sync
      Rear Curtain
      Max Flash Sync Speed1/250 sec1/125 sec
      Flash Compensation-3 to +3 EV (1/3, 1/2 EV Steps)
      External Flash Connectivity
      External Flash SystemTTLPentax
      External Flash ConnectionIntelligent Hot Shoe, PC TerminalHot Shoe (P-TTL, high speed sync available), wireless with PENTAX dedicated flash, X-sync socket
      Exposure Sony Alpha 7R IIIA Pentax 645D
      Exposure Metering ModesMulti
      Center-weighted
      Spot      		Multi
      Center-weighted
      Spot
      Exposure ModesAperture Priority, Auto, Manual, Program, Shutter PriorityProgram (P), Sensitivity Priority (Sv), Shutter Priority (Tv), Aperture Priority (Av), Shutter and Aperture Priority (TAv), Metered Manual, Bulb, X-Speed
      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) ±2 EV (3, 5 shots at 1/7 EV, 1/5 EV, 1/3 EV, 1/2 EV, 2/3 EV, 1 EV increments)
      Exposure Lock
      DXO Sony Alpha 7R IIIA Pentax 645D
      DxO Low Light ISO35231262
      DxO Color Depth26.024.6
      DxO Dynamic Range14.712.6
      DxO Overall Score10082
      Video Sony Alpha 7R IIIA Pentax 645D
      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]
      Interval Recording
      Video FormatsMPEG-4, AVCHD, XAVC S
      Max Video Resolution3840 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 min
      Terminals Sony Alpha 7R IIIA Pentax 645D
      Audio I/O1 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/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
      USB SpeedUSB 3.2 Gen 1x1 (5 GBit/sec)USB 2.0 (480 Mbit/sec)
      HDMI Output Micro
      SpeakerMono
      Built-in MicrophoneStereoStereo
      Microphone Input
      Headphone Output
      Flash Sync Port
      Connectivity Sony Alpha 7R IIIA Pentax 645D
      Built-in GPS
      Built-In Wi-Fi
      Wi-Fi Version802.11b/g/n, 2.4 GHz
      Built-In Bluetooth
      NFC
      Remote Control wired, wireless, smartphone Optional, wired or wireless
      Environmental Sony Alpha 7R IIIA Pentax 645D
      Environmental Sealing
      Operating Temperature32 to 104°F / 0 to 40°C14-104°F (-10 to 40°C)
      Physical Sony Alpha 7R IIIA Pentax 645D
      Dimensions127 x 96 x 74 mm (5 x 3.78 x 2.91")156 x 117 x 119 mm (6.14 x 4.61 x 4.69")
      Weight (inc. batteries)657 g (1.45 lb / 23.17 oz)1480 g (3.26 lb / 52.21 oz)
      Box Dimensions (LxWxH)9.6 x 6.1 x 5.7"9.5 x 9.2 x 6.7"
      Package Weight3.005 lb6.2 lb
      Power and Storage Sony Alpha 7R IIIA Pentax 645D
      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)      		Dual Slot: SD/SDHC
      Other Sony Alpha 7R IIIA Pentax 645D
      Self Timer 2 or 10 sec; continuous 3 or 5 exposures 2 or 10 sec
      Orientation Sensor
      Tripod Mounting Thread1 x 1/4"-20 Female (Bottom)
      Accessory Mount1 x Hot Shoe Mount
      Material of ConstructionMagnesium Alloy
      Electronic Level Gauge


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