• 35mm 861.6mm2
  • 26.2 megapixels
  • ISO 100 - 40,000
  • APS-C 361.2mm2
  • 25.7 megapixels
  • ISO 100 - 1,600,000

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Differences

Canon EOS RP advantages over Pentax K-3 III

  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 5.75 vs 3.76 microns
    Better low-light and dynamic range (all else equal)
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Lighter weight
    485g vs 820g
    Lighter weight
  • Bigger JPEG buffer
    Unlimited vs 30 shots
    Take more JPEG shots before waiting (burst mode)

Pentax K-3 III advantages over Canon EOS RP

  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • 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 250 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • Newer
    4 years vs 6 years old
    Newer cameras often support more advanced features
  • Higher-res screen
    540k vs 347k pixels
    More detail on the screen lets you judge focus and composition
  • More viewfinder magnification
    1.05x vs 0.70x
    Get a bigger view of the scene through the eye-level viewfinder
  • 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
    12.0 fps vs 5.0 fps
    Faster JPEG shooting (burst mode)
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    1600000 vs 102400 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • 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
  • 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
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Buy the Canon EOS RP
Body Only
  • Body Only
  • Kit with RF 24-105mm lens
All EOS RP Deals

Your purchases support this site

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

  • Very good image quality; Good high ISO performance; Fast Dual Pixel CMOS AF autofocus system; Eye AF with tracking & video support; 4K video; Good build quality; Excellent value.

  • No IBIS; Sub-par dynamic range; Burst shooting tops out at 5fps; Poor battery life; Limited video features.

  • Read our Canon EOS RP Review

The Competition

Compared to Pentax KP

Canon EOS RP
Pentax KP
  • $949
  • 35mm
  • Larger sensor
  • Tilt-swivel screen
  • $999
  • APS-C
  • Less expensive
  • Focus peaking

Compare Canon EOS RP vs Pentax KP

Pentax K-3 III
Pentax KP
  • $1730
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $999
  • APS-C
  • Less expensive
  • Tiltable Screen

Compare Pentax K-3 III vs Pentax KP

Compared to Canon 90D

Canon EOS RP
Canon 90D
  • $949
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $1099
  • APS-C
  • Less expensive
  • Fast startup

Compare Canon EOS RP vs Canon 90D

Pentax K-3 III
Canon 90D
  • $1730
  • 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 Nikon Z5

Canon EOS RP
Nikon Z5
  • $949
  • 35mm
  • Tilt-swivel screen
  • Lighter weight
  • $1147
  • 35mm
  • Less expensive
  • Focus peaking

Compare Canon EOS RP vs Nikon Z5

Pentax K-3 III
Nikon Z5
  • $1730
  • APS-C
  • High resolution composite
  • Top deck display
  • $1147
  • 35mm
  • Less expensive
  • Larger sensor

Compare Pentax K-3 III vs Nikon Z5

Compared to Sony A7C

Canon EOS RP
Sony A7C
  • $949
  • 35mm
  • More telephoto lens reach
  • Wider angle kit lens
  • $1598
  • 35mm
  • Less expensive
  • Focus peaking

Compare Canon EOS RP vs Sony A7C

Pentax K-3 III
Sony A7C
  • $1730
  • APS-C
  • Lens selection
  • High resolution composite
  • $1598
  • 35mm
  • Less expensive
  • Tilt-swivel screen

Compare Pentax K-3 III vs Sony A7C

Compared to Nikon Z6 II

Canon EOS RP
Nikon Z6 II
  • $949
  • 35mm
  • Tilt-swivel screen
  • More telephoto lens reach
  • $1747
  • 35mm
  • Focus peaking
  • In-Camera Image Stabilization

Compare Canon EOS RP vs Nikon Z6 II

Pentax K-3 III
Nikon Z6 II
  • $1730
  • APS-C
  • High resolution composite
  • Optional anti-aliasing filter
  • $1747
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Pentax K-3 III vs Nikon Z6 II

Compare Other Cameras?