• APS-C 366.6mm2
  • 24.4 megapixels
  • ISO 100 - 51,200
  • 35mm 849.7mm2
  • 61.0 megapixels
  • ISO 100 - 32,000

Buy From

Differences

Pentax K-3 advantages over Sony A7R IV

  • Less expensive
    $999 vs $3498*
    Save money for lenses or accessories
  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Fast startup
    ~0.90 vs 1.3 sec
    Faster startup lets you catch the moment
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • Less shutter lag
    0.14 vs 0.20 sec
    Focus and take a photo quickly (wide angle)
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré

Sony A7R IV advantages over Pentax K-3

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Shoot 4K video
    4K (UHD) vs 1080p
    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
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • 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
  • Newer
    3 months vs 6 years old
    Newer cameras often support more advanced features
  • More viewfinder magnification
    0.78x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    61.0 vs 24.4 megapixels
    Higher resolution photos
  • Faster JPEG shooting
    10.0 fps vs 7.1 fps
    Faster JPEG shooting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Higher extended ISO
    102400 vs 51200 ISO
    Higher extended ISO can give more low-light flexibility

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
  • In-Camera Image Stabilization
    Both provide
    Reduces the effects of camera shake at slower shutter speeds
  • External Mic Jack
    Both provide
    Improved sound fidelity when shooting video
  • 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
  • Headphone jack
    Both provide
    Monitor audio recording while you shoot video
  • 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

User reviews

Buy From

Review Excerpt

  • Top-notch image quality; Great ergonomics in a compact body; Unique on-demand low-pass filtering; Broad sensitivity range; Large and bright viewfinder for an APS-C camera; Dual card slots; Optional Wi-Fi remote control

  • AE Lock button is poorly located; Below-average battery life for a DSLR; Rather dated-looking menu system; Requires a different battery grip accessory than its predecessors; Less third-party support than some rivals

The Competition

Compared to Nikon D7100

Pentax K-3
Nikon D7100
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $897
  • APS-C
  • Fast startup
  • Longer stills battery life
Sony A7R IV
Nikon D7100
  • $3498
  • 35mm
  • Focus peaking
  • Larger sensor
  • $897
  • APS-C
  • Less expensive
  • Lens selection

Compared to Canon 70D

Pentax K-3
Canon 70D
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $994
  • APS-C
  • Tilt-swivel screen
  • Touchscreen
Sony A7R IV
Canon 70D
  • $3498
  • 35mm
  • Focus peaking
  • Larger sensor
  • $994
  • APS-C
  • Lens selection
  • Less expensive

Compared to Nikon D7200

Pentax K-3
Nikon D7200
  • $699
  • APS-C
  • Focus peaking
  • Less expensive
  • $1097
  • APS-C
  • Fast startup
  • Built-in Wi-Fi
Sony A7R IV
Nikon D7200
  • $3498
  • 35mm
  • Focus peaking
  • Larger sensor
  • $1097
  • APS-C
  • Less expensive
  • Lens selection

Compared to Sony A7R III

Pentax K-3
Sony A7R III
  • $699
  • APS-C
  • Less expensive
  • Lens selection
  • $2498
  • 35mm
  • Larger sensor
  • Bigger pixels
Sony A7R IV
Sony A7R III
  • $3498
  • 35mm
  • Fast startup
  • Newer
  • $2498
  • 35mm
  • Less expensive
  • Bigger pixels

Compared to Fujifilm GFX 50R

Pentax K-3
Fujifilm GFX 50R
  • $699
  • APS-C
  • Less expensive
  • In-Camera Image Stabilization
  • $3999
  • Medium format
  • Larger sensor
  • Bigger pixels
Sony A7R IV
Fujifilm GFX 50R
  • $3498
  • 35mm
  • In-Camera Image Stabilization
  • Shoot 4K video
  • $3999
  • Medium format
  • Larger sensor
  • Bigger pixels
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