• 4/3 224.9mm2
  • 10.2 megapixels
  • ISO 160 - 51,200
  • APS-C 361.2mm2
  • 25.7 megapixels
  • ISO 100 - 1,600,000

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Differences

Panasonic GH5S advantages over Pentax K-3 III

  • Less expensive
    $1798* vs $2344
    Save money for lenses or accessories
  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Bigger pixels
    ~ 4.51 vs 3.76 microns
    Better low-light and dynamic range (all else equal)
  • Longer exposure
    60 vs 30 sec
    Long exposures for night shots
  • Bigger JPEG buffer
    600 vs 30 shots
    Take more JPEG shots before waiting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Faster shutter
    1/16000 vs 1/8000 sec
    Shoot wide open in bright light

Pentax K-3 III advantages over Panasonic GH5S

  • Larger sensor
    APS-C vs 4/3
    More sensor area. Bigger is (generally) better.
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • Longer stills battery life
    More info 800 vs 440 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • Newer
    4 years vs 7 years old
    Newer cameras often support more advanced features
  • Higher-res screen
    540k vs 405k pixels
    More detail on the screen lets you judge focus and composition
  • More viewfinder magnification
    1.05x vs 0.76x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    25.7 vs 10.2 megapixels
    Higher resolution photos
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré
  • Higher extended ISO
    1600000 vs 204800 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
  • Shoot 4K video
    Both provide
    Make sure you have a fast computer
  • Touchscreen
    Both provide
    Interact with your camera just like your smartphone
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • Built-in Bluetooth
    Both provide
    Always-on wireless connectivity
  • 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

  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • NFC
    Neither provide
    Simplifies pairing your camera with supported phones
  • Built-in GPS
    Neither provide
    Geotag your photos
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash

User reviews

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Body Only
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Buy the Pentax K-3 III
Body Only
  • Body Only
  • Kit with 20-40mm F2.8-4 Lens
  • Kit with 55-300mm f/4.5-6.3 Lens
All K-3 III Deals

Review Excerpt

  • Excellent video quality; Very good high ISO performance; Cinema 4K & UHD video up to 60p; Full HD up to 240p; 10-bit internal video recording; Tons of features & options for advanced/pro videographers.

  • 10MP resolution is limiting for still photos; No in-body image stabilization; Slower AF than GH5; Buffer clearing could be faster; No 6K Photo features due to sensor resolution.

  • Read our Panasonic GH5S Express Review

The Competition

Compared to Panasonic GH5

Panasonic GH5S
Panasonic GH5
  • $1998
  • 4/3
  • Slower slow-motion
  • Bigger pixels
  • $1348
  • 4/3
  • Less expensive
  • In-Camera Image Stabilization

Compare Panasonic GH5S vs Panasonic GH5

Pentax K-3 III
Panasonic GH5
  • $1847
  • APS-C
  • Larger sensor
  • High resolution composite
  • $1348
  • 4/3
  • Less expensive
  • Tilt-swivel screen

Compare Pentax K-3 III vs Panasonic GH5

Compared to Pentax KP

Panasonic GH5S
Pentax KP
  • $1998
  • 4/3
  • Tilt-swivel screen
  • Bigger pixels
  • $999
  • APS-C
  • Less expensive
  • Larger sensor

Compare Panasonic GH5S vs Pentax KP

Pentax K-3 III
Pentax KP
  • $1847
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $999
  • APS-C
  • Less expensive
  • Tiltable Screen

Compare Pentax K-3 III vs Pentax KP

Compared to Panasonic G9

Panasonic GH5S
Panasonic G9
  • $1998
  • 4/3
  • Slower slow-motion
  • Bigger pixels
  • $1065
  • 4/3
  • Less expensive
  • In-Camera Image Stabilization

Compare Panasonic GH5S vs Panasonic G9

Pentax K-3 III
Panasonic G9
  • $1847
  • APS-C
  • Larger sensor
  • Longer stills battery life
  • $1065
  • 4/3
  • Less expensive
  • Tilt-swivel screen

Compare Pentax K-3 III vs Panasonic G9

Compared to Canon 90D

Panasonic GH5S
Canon 90D
  • $1998
  • 4/3
  • Slower slow-motion
  • Focus peaking
  • $1099
  • APS-C
  • Less expensive
  • Larger sensor

Compare Panasonic GH5S vs Canon 90D

Pentax K-3 III
Canon 90D
  • $1847
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1099
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compare Pentax K-3 III vs Canon 90D

Compared to Olympus E-M1 Mark III

Panasonic GH5S
Olympus E-M1 Mark III
  • $1998
  • 4/3
  • Less expensive
  • Bigger pixels
  • $1649
  • 4/3
  • In-Camera Image Stabilization
  • High resolution composite

Compare Panasonic GH5S vs Olympus E-M1 Mark III

Pentax K-3 III
Olympus E-M1 Mark III
  • $1847
  • APS-C
  • Larger sensor
  • Built-in Bluetooth
  • $1649
  • 4/3
  • Tilt-swivel screen
  • On-sensor phase detect

Compare Pentax K-3 III vs Olympus E-M1 Mark III

Compare Other Cameras?