• Medium format 1,436.6mm2
  • 51.4 megapixels
  • ISO 100 - 204,800
  • APS-H 476.1mm2
  • 25.6 megapixels
  • ISO 100 - 6400

Buy From

Differences

Pentax 645Z advantages over Sigma sd Quattro H

  • Larger sensor
    Medium format vs APS-H
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 5.31 vs 4.30 microns
    Better low-light and dynamic range (all else equal)
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • More pixels
    51.4 vs 25.6 megapixels
    Higher resolution photos
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Higher extended ISO
    204800 vs 6400 ISO
    Higher extended ISO can give more low-light flexibility

Sigma sd Quattro H advantages over Pentax 645Z

  • Less expensive
    $1099 vs $4997
    Save money for lenses or accessories
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Thinner
    90 mm vs 123 mm
    Thinner
  • Newer
    2 years vs 4 years old
    Newer cameras often support more advanced features
  • Lighter weight
    635g vs 1555g
    Lighter weight
  • More dots on screen
    1620k vs 1037k dots
    Can mean greater resolution or a brighter screen
  • Doesn't require an AA filter
    Yes vs No
    A unique sensor design provides sharp photos without moiré
  • Faster RAW shooting
    4.4 fps vs 3.1 fps
    Faster RAW shooting in burst mode

Similarities

Common Strengths

  • Focus peaking
    Both provide
    Your camera will highlight what's in focus
  • 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
  • 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 Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • Touchscreen
    Neither provide
    Interact with your camera just like your smartphone
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • NFC
    Neither provide
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • Built-in GPS
    Neither provide
    Geotag your photos
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash
  • Headphone jack
    Neither provide
    Monitor audio recording while you shoot video
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

Buy From

Review Excerpt

  • Phenomenal resolution and detail; Great high ISO performance; Rugged, weather-sealed body; Huge, bright viewfinder; Fast autofocus works well in low light; Swift performance for a medium-format camera; Good battery life; Shoots Full HD video

  • Quite bulky compared to an APS-C or full-frame DSLR; Autofocus points clustered near center of frame; Most lenses aren't weather-sealed or optimized for digital; Prone to aliasing artifacts (but so are most high-end cameras these days); Attracts a lot of attention from passers-by

The Competition

Compared to Pentax 645D

Pentax 645Z
Pentax 645D
  • $5665
  • Medium format
  • Focus peaking
  • Tiltable Screen
  • $3599
  • Medium format
  • Fast startup
  • Longer stills battery life
Sigma sd Quattro H
Pentax 645D
  • $1099
  • APS-H
  • Focus peaking
  • On-sensor phase detect
  • $3599
  • Medium format
  • Larger sensor
  • Bigger pixels

Compared to Leica S (Typ 007)

Pentax 645Z
Leica S (Typ 007)
  • $5665
  • Medium format
  • Less expensive
  • Tiltable Screen
  • $19995
  • Medium format
  • Shoot 4K video
  • Built-in Wi-Fi
Sigma sd Quattro H
Leica S (Typ 007)
  • $1099
  • APS-H
  • Less expensive
  • On-sensor phase detect
  • $19995
  • Medium format
  • Larger sensor
  • Bigger pixels

Compared to Leica S-E (Typ 006)

Pentax 645Z
Leica S-E (Typ 006)
  • $5665
  • Medium format
  • Focus peaking
  • Tiltable Screen
  • $16900
  • Medium format
  • Built-in GPS
  • Thinner
Sigma sd Quattro H
Leica S-E (Typ 006)
  • $1099
  • APS-H
  • Focus peaking
  • On-sensor phase detect
  • $16900
  • Medium format
  • Larger sensor
  • Bigger pixels

Compared to Sigma sd Quattro

Pentax 645Z
Sigma sd Quattro
  • $5665
  • Medium format
  • Larger sensor
  • Bigger pixels
  • $699
  • APS-C
  • Less expensive
  • On-sensor phase detect
Sigma sd Quattro H
Sigma sd Quattro
  • $1099
  • APS-H
  • Larger sensor
  • More viewfinder magnification
  • $699
  • APS-C
  • Less expensive
  • Bigger RAW buffer

Compared to Fujifilm X-H1

Pentax 645Z
Fujifilm X-H1
  • $5665
  • Medium format
  • Larger sensor
  • Bigger pixels
  • $1599
  • APS-C
  • Lens selection
  • Less expensive
Sigma sd Quattro H
Fujifilm X-H1
  • $1099
  • APS-H
  • Less expensive
  • Larger sensor
  • $1599
  • APS-C
  • Lens selection
  • In-Camera Image Stabilization
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