• APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200
  • 35mm 864.0mm2
  • 24.1 megapixels
  • ISO 100 - 102,400

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Differences

Pentax K-S2 advantages over Canon R3

  • Less expensive
    $800 vs $5999 (MSRP)
    Save money for lenses or accessories
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Thinner
    64 mm vs 87 mm
    Thinner
  • Optional anti-aliasing filter
    Optional vs Fixed
    Lets you choose sharper photos or reduced moiré

Canon R3 advantages over Pentax K-S2

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.00 vs 4.29 microns
    Better low-light and dynamic range (all else equal)
  • Shoot 4K video
    No vs 1080p
    Make sure you have a fast computer
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • 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
  • Longer stills battery life
    More info 760 vs 410 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • Newer
    3 years vs 10 years old
    Newer cameras often support more advanced features
  • More dots on screen
    4150k vs 922k dots
    Can mean greater resolution or a brighter screen
  • More viewfinder magnification
    0.76x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    24.1 vs 20.1 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Faster JPEG shooting
    30.0 fps vs 5.2 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    150 vs 28 shots
    Take more JPEG shots before waiting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Higher extended ISO
    204800 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
  • Tilt-swivel screen
    Both provide
    Tilt and swivel the screen for maximum shooting flexibility
  • 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
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • 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
  • 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
  • Built-in GPS
    Neither provide
    Geotag your photos

User reviews

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Buy the Pentax K-S2
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Buy the Canon R3

Review Excerpt

  • Very compact for a weather-sealed DSLR; Good ergonomics and great viewfinder; Excellent image quality; Decent performance for its class; Articulated screen is great for difficult compositions; Offers features not found in other Pentax DSLRs

  • 18-50mm kit lens is fiddly and prone to jamming when retracted; Wi-Fi is slow and unintuitive; Slow startup; Limited movie mode; Poor battery life for a DSLR; Priced too close to its enthusiast-grade sibling

  • Read our Pentax K-S2 Review

The Competition

Compared to Pentax K-500

Pentax K-S2
Pentax K-500
  • $499
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi
  • $597
  • APS-C
  • Less expensive
  • Longer stills battery life

Compare Pentax K-S2 vs Pentax K-500

Canon R3
Pentax K-500
  • $5999
  • 35mm
  • Tilt-swivel screen
  • Larger sensor
  • $597
  • APS-C
  • Less expensive
  • Internal flash

Compare Canon R3 vs Pentax K-500

Compared to Pentax K-S1

Pentax K-S2
Pentax K-S1
  • $499
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi
  • $502
  • APS-C
  • Higher-res screen

Compare Pentax K-S2 vs Pentax K-S1

Canon R3
Pentax K-S1
  • $5999
  • 35mm
  • Tilt-swivel screen
  • Larger sensor
  • $502
  • APS-C
  • Less expensive
  • Internal flash

Compare Canon R3 vs Pentax K-S1

Compared to Nikon D5500

Pentax K-S2
Nikon D5500
  • $499
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $697
  • APS-C
  • Touchscreen
  • Fast startup

Compare Pentax K-S2 vs Nikon D5500

Canon R3
Nikon D5500
  • $5999
  • 35mm
  • Focus peaking
  • Larger sensor
  • $697
  • APS-C
  • Internal flash
  • Lacks anti-aliasing filter

Compare Canon R3 vs Nikon D5500

Compared to Leica SL2-S

Pentax K-S2
Leica SL2-S
  • $499
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $4895
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Pentax K-S2 vs Leica SL2-S

Canon R3
Leica SL2-S
  • $5999
  • 35mm
  • Tilt-swivel screen
  • On-sensor phase detect
  • $4895
  • 35mm
  • Less expensive
  • Slower slow-motion

Compare Canon R3 vs Leica SL2-S

Compared to Canon R5 C

Pentax K-S2
Canon R5 C
  • $499
  • APS-C
  • Less expensive
  • NFC
  • $4499
  • 35mm
  • Larger sensor
  • Shoot 4K video

Compare Pentax K-S2 vs Canon R5 C

Canon R3
Canon R5 C
  • $5999
  • 35mm
  • Bigger pixels
  • More dots on screen
  • $4499
  • 35mm
  • Less expensive
  • Lighter weight

Compare Canon R3 vs Canon R5 C

Compare Other Cameras?