• Medium format 1,452.0mm2
  • 40.0 megapixels
  • ISO 200 - 1000
  • 35mm 861.6mm2
  • 50.1 megapixels
  • ISO 100 - 32,000

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Differences

Pentax 645D advantages over Sony A1

  • Larger sensor
    Medium format vs 35mm
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.06 vs 4.16 microns
    Better low-light and dynamic range (all else equal)
  • Longer stills battery life
    More info 800 vs 530 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera

Sony A1 advantages over Pentax 645D

  • Lens selection
    Good vs Limited
    Better lens selection gives you more options
  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Shoot 4K video
    No vs No
    Make sure you have a fast computer
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Built-in Wi-Fi
    Wi-Fi vs None
    Share your photos wirelessly
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Yes vs No
    Always-on wireless connectivity
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Thinner
    80 mm vs 119 mm
    Thinner
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Higher max flash sync
    1/400 vs 1/125 sec
    Reduce the effect of ambient light in flash shots
  • Newer
    4 years vs 14 years old
    Newer cameras often support more advanced features
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • Lighter weight
    737g vs 1480g
    Lighter weight
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • More viewfinder magnification
    0.90x vs 0.78x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    50.1 vs 40.0 megapixels
    Higher resolution photos
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Faster JPEG shooting
    30.0 fps vs 1.1 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    165 vs 19 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster RAW shooting
    20.0 fps vs 1.1 fps
    Faster RAW shooting in burst mode
  • Bigger RAW buffer
    155 vs 16 shots
    Larger buffer for RAW shots (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Faster shutter
    1/32000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    102400 vs 1600 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Dual card slots
    Both provide
    Gives you more storage flexibility
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • Built-in GPS
    Neither provide
    Geotag your photos
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash

User reviews

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Review Excerpt

  • Very high-resolution 40-megapixel sensor; Plentiful controls with great placement; Excellent optical viewfinder; Dual SDHC card slots; Infrared remote sensors front and back.

  • High price tag; Aliasing artifacts; Produces ~70MB RAW files.

  • Read our Pentax 645D Review

The Competition

Compared to Leica S2

Pentax 645D
Leica S2
  • $3599
  • Medium format
  • Less expensive
  • More cross-type AF points
  • $22995
  • Medium format
  • Thinner
  • More viewfinder magnification

Compare Pentax 645D vs Leica S2

Sony A1
Leica S2
  • $5831
  • 35mm
  • Lens selection
  • Focus peaking
  • $22995
  • Medium format
  • Larger sensor
  • Bigger pixels

Compare Sony A1 vs Leica S2

Compared to Leica S (Typ 006)

Pentax 645D
Leica S (Typ 006)
  • $3599
  • Medium format
  • Less expensive
  • Higher effective ISO
  • $10535
  • Medium format
  • Thinner
  • More viewfinder magnification

Compare Pentax 645D vs Leica S (Typ 006)

Sony A1
Leica S (Typ 006)
  • $5831
  • 35mm
  • Lens selection
  • Focus peaking
  • $10535
  • Medium format
  • Larger sensor
  • Bigger pixels

Compare Sony A1 vs Leica S (Typ 006)

Compared to Pentax 645Z

Pentax 645D
Pentax 645Z
  • $3599
  • Medium format
  • Fast startup
  • Longer stills battery life
  • $4845
  • Medium format
  • Focus peaking
  • Tiltable Screen

Compare Pentax 645D vs Pentax 645Z

Sony A1
Pentax 645Z
  • $5831
  • 35mm
  • Lens selection
  • In-Camera Image Stabilization
  • $4845
  • Medium format
  • Less expensive
  • Larger sensor

Compare Sony A1 vs Pentax 645Z

Compared to Sony A7R IV

Pentax 645D
Sony A7R IV
  • $3599
  • Medium format
  • Larger sensor
  • Bigger pixels
  • $3331
  • 35mm
  • Lens selection
  • Focus peaking

Compare Pentax 645D vs Sony A7R IV

Sony A1
Sony A7R IV
  • $5831
  • 35mm
  • Slower slow-motion
  • Longer video battery life
  • $3331
  • 35mm
  • Less expensive
  • High resolution composite

Compare Sony A1 vs Sony A7R IV

Compared to Canon R5

Pentax 645D
Canon R5
  • $3599
  • Medium format
  • Larger sensor
  • Bigger pixels
  • $3349
  • 35mm
  • Focus peaking
  • Tilt-swivel screen

Compare Pentax 645D vs Canon R5

Sony A1
Canon R5
  • $5831
  • 35mm
  • Slower slow-motion
  • NFC
  • $3349
  • 35mm
  • Less expensive
  • Tilt-swivel screen

Compare Sony A1 vs Canon R5

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