• APS-C 366.6mm2
  • 24.4 megapixels
  • ISO 100 - 51,200
  • 35mm 847.3mm2
  • 12.2 megapixels
  • ISO 100 - 102,400

Buy From

Differences

Pentax K-3 advantages over Sony A7S

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Less expensive
    $999 vs $1998*
    Save money for lenses or accessories
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Fast startup
    ~0.90 vs 2.0 sec
    Faster startup lets you catch the moment
  • Longer stills battery life
    More info 560 vs 380 shots
    Capture more photos
  • 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
  • More pixels
    24.4 vs 12.2 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Optional anti-aliasing filter
    Optional vs Fixed
    Lets you choose sharper photos or reduced moiré
  • Faster JPEG shooting
    7.1 fps vs 5.0 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    7.1 fps vs 5.0 fps
    Faster RAW shooting in burst mode

Sony A7S advantages over Pentax K-3

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 8.40 vs 3.91 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • 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
  • Higher effective ISO
    3,702 vs 1,216 iso
    Take photos in low light with less noise
  • Thinner
    48 mm vs 77 mm
    Thinner
  • More viewfinder magnification
    0.71x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • Bigger RAW buffer
    39 vs 24 shots
    Larger buffer for RAW shots (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Higher extended ISO
    409600 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
  • 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
  • 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
  • Touchscreen
    Neither provide
    Interact with your camera just like your smartphone
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • Built-in GPS
    Neither provide
    Geotag your photos
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance

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

  • Outstanding high ISO performance; excellent dynamic range; 4K video recording (via uncompressed HDMI); XAVC S option for HD video; Slightly improved battery life over A7/A7R; Built-in Wi-Fi & NFC connectivity.

  • 4K video requires expensive external recorder; Sluggish startup time; Loud shutter; Silent Shooting mode hurts image quality; Lacks a built-in, pop-up flash; Limited selection of native Sony FE lenses.

The Competition

Compared to Leica M-E (Typ 220)

Pentax K-3
Leica M-E (Typ 220)
  • $699
  • APS-C
  • Lens selection
  • Less expensive
  • $4896
  • 35mm
  • Larger sensor
  • Bigger pixels
Sony A7S
Leica M-E (Typ 220)
  • $1998
  • 35mm
  • Lens selection
  • Less expensive
  • $4896
  • 35mm
  • Thinner
  • More pixels

Compared to Nikon D7100

Pentax K-3
Nikon D7100
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $795
  • APS-C
  • Fast startup
  • Longer stills battery life
Sony A7S
Nikon D7100
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
  • $795
  • APS-C
  • Lens selection
  • Less expensive

Compared to Nikon D5300

Pentax K-3
Nikon D5300
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $571
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Sony A7S
Nikon D5300
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
  • $571
  • APS-C
  • Lens selection
  • Less expensive

Compared to Nikon D7200

Pentax K-3
Nikon D7200
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $797
  • APS-C
  • Fast startup
  • Built-in Wi-Fi
Sony A7S
Nikon D7200
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
  • $797
  • APS-C
  • Lens selection
  • Less expensive

Compared to Sony A7S II

Pentax K-3
Sony A7S II
  • $699
  • APS-C
  • Lens selection
  • Less expensive
  • $2198
  • 35mm
  • Larger sensor
  • Bigger pixels
Sony A7S
Sony A7S II
  • $1998
  • 35mm
  • Fast startup
  • Higher effective ISO
  • $2198
  • 35mm
  • In-Camera Image Stabilization
  • Shoot 4K video
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