• APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200
  • 35mm 861.6mm2
  • 50.1 megapixels
  • ISO 100 - 32,000

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Differences

Pentax K-S1 advantages over Sony A1

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré

Sony A1 advantages over Pentax K-S1

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • 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
  • 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
  • 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
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Higher max flash sync
    1/400 vs 1/180 sec
    Reduce the effect of ambient light in flash shots
  • Newer
    4 years vs 10 years old
    Newer cameras often support more advanced features
  • More viewfinder magnification
    0.90x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    50.1 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 5.4 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    165 vs 20 shots
    Take more JPEG shots before waiting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Faster shutter
    1/32000 vs 1/6000 sec
    Shoot wide open in bright light
  • 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
  • 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

  • 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
  • Top deck display
    Neither provide
    Check settings with a screen on top of the camera

User reviews

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Your purchases support this site

Buy the Pentax K-S1

Review Excerpt

The Competition

Compared to Sony A58

Pentax K-S1
Sony A58
  • $502
  • APS-C
  • Lens selection
  • Higher effective ISO
  • $598
  • APS-C
  • Less expensive
  • In-camera panoramas
Sony A1
Sony A58
  • $6498
  • 35mm
  • Larger sensor
  • Shoot 4K video
  • $598
  • APS-C
  • In-camera panoramas
  • Longer stills battery life

Compared to Pentax K-500

Pentax K-S1
Pentax K-500
  • $502
  • APS-C
  • HDMI out
  • More pixels
  • $597
  • APS-C
  • Less expensive
  • Longer stills battery life
Sony A1
Pentax K-500
  • $6498
  • 35mm
  • Larger sensor
  • Shoot 4K video
  • $597
  • APS-C
  • Lens selection
  • Bigger pixels

Compared to Pentax K-S2

Pentax K-S1
Pentax K-S2
  • $502
  • APS-C
  • Higher-res screen
  • $499
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi
Sony A1
Pentax K-S2
  • $6498
  • 35mm
  • Larger sensor
  • Shoot 4K video
  • $499
  • APS-C
  • Lens selection
  • Tilt-swivel screen

Compared to Sony A7R IV

Pentax K-S1
Sony A7R IV
  • $502
  • APS-C
  • Lens selection
  • Internal flash
  • $3220
  • 35mm
  • Larger sensor
  • Shoot 4K video
Sony A1
Sony A7R IV
  • $6498
  • 35mm
  • Slower slow-motion
  • Longer video battery life
  • $3220
  • 35mm
  • Less expensive
  • High resolution composite

Compared to Canon R5

Pentax K-S1
Canon R5
  • $502
  • APS-C
  • Longer stills battery life
  • Internal flash
  • $3349
  • 35mm
  • Tilt-swivel screen
  • Larger sensor
Sony A1
Canon R5
  • $6498
  • 35mm
  • Slower slow-motion
  • NFC
  • $3349
  • 35mm
  • Less expensive
  • Tilt-swivel screen
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