• 35mm 847.3mm2
  • 12.2 megapixels
  • ISO 100 - 102,400
  • APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200

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Differences

Sony A7S advantages over Pentax K-S2

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 8.40 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
  • Thinner
    48 mm vs 64 mm
    Thinner
  • Higher-res screen
    307k vs 230k pixels
    More detail on the screen lets you judge focus and composition
  • More viewfinder magnification
    0.71x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Bigger JPEG buffer
    62 vs 28 shots
    Take more JPEG shots before waiting (burst mode)
  • Bigger RAW buffer
    39 vs 9 shots
    Larger buffer for RAW shots (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Higher extended ISO
    409600 vs 51200 ISO
    Higher extended ISO can give more low-light flexibility

Pentax K-S2 advantages over Sony A7S

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Less expensive
    $499 vs $1998*
    Save money for lenses or accessories
  • Tilt-swivel screen
    Tilt-swivel vs tilt-only
    Tilt and swivel the screen for maximum shooting flexibility
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Fast startup
    ~1.00 vs 2.0 sec
    Faster startup lets you catch the moment
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • More pixels
    20.1 vs 12.2 megapixels
    Higher resolution photos
  • 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
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • NFC
    Both provide
    Simplifies pairing your camera with supported phones
  • 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

  • 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
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • 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

User reviews

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Your purchases support this site

Buy the Pentax K-S2

Review Excerpt

  • Outstanding high ISO performance; excellent dynamic range; 4K video recording (via uncompressed HDMI); XAVC S option for HD video; Slightly improved battery life over A7/A7R; Built-in Wi-Fi & NFC connectivity.

  • 4K video requires expensive external recorder; Sluggish startup time; Loud shutter; Silent Shooting mode hurts image quality; Lacks a built-in, pop-up flash; Limited selection of native Sony FE lenses.

  • 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

The Competition

Compared to Leica M-E (Typ 220)

Sony A7S
Leica M-E (Typ 220)
  • $1998
  • 35mm
  • Lens selection
  • Less expensive
  • $4409
  • 35mm
  • Thinner
  • More pixels
Pentax K-S2
Leica M-E (Typ 220)
  • $499
  • APS-C
  • Lens selection
  • Less expensive
  • $4409
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Pentax K-S1

Sony A7S
Pentax K-S1
  • $1998
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $399
  • APS-C
  • Lens selection
  • In-Camera Image Stabilization
Pentax K-S2
Pentax K-S1
  • $499
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi
  • $399
  • APS-C
  • Higher-res screen

Compared to Nikon D5500

Sony A7S
Nikon D5500
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
  • $597
  • APS-C
  • Lens selection
  • Less expensive
Pentax K-S2
Nikon D5500
  • $499
  • APS-C
  • Focus peaking
  • Less expensive
  • $597
  • APS-C
  • Touchscreen
  • Fast startup

Compared to Sony A7S II

Sony A7S
Sony A7S II
  • $1998
  • 35mm
  • Fast startup
  • Higher effective ISO
  • $2198
  • 35mm
  • In-Camera Image Stabilization
  • Shoot 4K video
Pentax K-S2
Sony A7S II
  • $499
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $2198
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Leica M (Typ 262)

Sony A7S
Leica M (Typ 262)
  • $1998
  • 35mm
  • Lens selection
  • Focus peaking
  • $4462
  • 35mm
  • Newer
  • More pixels
Pentax K-S2
Leica M (Typ 262)
  • $499
  • APS-C
  • Lens selection
  • Focus peaking
  • $4462
  • 35mm
  • Larger sensor
  • Bigger pixels
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