• 35mm 855.6mm2
  • 24.3 megapixels
  • ISO 100 - 25,600
  • APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200

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Differences

Sony A7 advantages over Pentax K-S1

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 5.97 vs 4.29 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
    2,248 vs 1,061 iso
    Take photos in low light with less noise
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Thinner
    48 mm vs 69 mm
    Thinner
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More viewfinder magnification
    0.71x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    24.3 vs 20.1 megapixels
    Higher resolution photos
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Bigger JPEG buffer
    50 vs 20 shots
    Take more JPEG shots before waiting (burst mode)

Pentax K-S1 advantages over Sony A7

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Less expensive
    $500 vs $998
    Save money for lenses or accessories
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Longer stills battery life
    More info 480 vs 340 shots
    Capture more photos
  • More telephoto lens reach
    83 mm vs 70 mm
    Capture objects farther away with the kit lens
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Optional anti-aliasing filter
    Optional vs Fixed
    Lets you choose sharper photos or reduced moiré

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
  • 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
  • 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
  • Top deck display
    Neither provide
    Check settings with a screen on top of the camera
  • Dual card slots
    Neither provide
    Gives you more storage flexibility
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Your purchases support this site

Buy the Pentax K-S1

Review Excerpt

  • Incredibly small body for a fully-featured, full-frame camera; Very high resolution; Hybrid autofocus is reasonably fast and confident; Significantly better burst-shooting performance than A7R; Excellent image quality even at very high sensitivities; Faster x-sync than A7R; Accepts existing Alpha-mount and E-mount lenses, and can optionally crop to APS-C image circle.

  • Grass-is-greener syndrome when compared to its higher-res sibling; Moderate performance; Loud shutter (but electronic first-curtain helps); Mediocre battery life when using electronic viewfinder; Weak low-light autofocus considering its price; Limited selection of native Sony FE lenses.

The Competition

Compared to Sony A7R

Sony A7
Sony A7R
  • $798
  • 35mm
  • Less expensive
  • Bigger pixels
  • $1799
  • 35mm
  • Higher effective ISO
  • More pixels
Pentax K-S1
Sony A7R
  • $499
  • APS-C
  • Lens selection
  • Less expensive
  • $1799
  • 35mm
  • Larger sensor
  • In-camera panoramas

Compared to Sony A7 II

Sony A7
Sony A7 II
  • $798
  • 35mm
  • Less expensive
  • $998
  • 35mm
  • In-Camera Image Stabilization
Pentax K-S1
Sony A7 II
  • $499
  • APS-C
  • Lens selection
  • Less expensive
  • $998
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Nikon D5500

Sony A7
Nikon D5500
  • $798
  • 35mm
  • Focus peaking
  • Larger sensor
  • $597
  • APS-C
  • Lens selection
  • Less expensive
Pentax K-S1
Nikon D5500
  • $499
  • APS-C
  • Less expensive
  • Focus peaking
  • $597
  • APS-C
  • Tilt-swivel screen
  • Touchscreen

Compared to Pentax K-S2

Sony A7
Pentax K-S2
  • $798
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $499
  • APS-C
  • Lens selection
  • Less expensive
Pentax K-S1
Pentax K-S2
  • $499
  • APS-C
  • Higher-res screen
  • $499
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi

Compared to Sony A7R II

Sony A7
Sony A7R II
  • $798
  • 35mm
  • Less expensive
  • Bigger pixels
  • $1798
  • 35mm
  • In-Camera Image Stabilization
  • Shoot 4K video
Pentax K-S1
Sony A7R II
  • $499
  • APS-C
  • Less expensive
  • Lens selection
  • $1798
  • 35mm
  • Larger sensor
  • Shoot 4K video
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