• 1/2.3 inch 28.1mm2
  • 16.0 megapixels
  • 21.00mm - 105.00mm (35mm eq.)
  • APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200

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Differences

Olympus TG-850 advantages over Pentax K-S2

  • Less expensive
    $250 vs $800 (MSRP)
    Save money for lenses or accessories
  • Waterproof
    Yes vs No
    Take photos underwater without destroying your camera!
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Thinner
    27 mm vs 64 mm
    Thinner
  • Faster JPEG shooting
    7.0 fps vs 5.2 fps
    Faster JPEG shooting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

Pentax K-S2 advantages over Olympus TG-850

  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • Larger sensor
    APS-C vs 1/2.3 inch
    More sensor area. Bigger is (generally) better.
  • Tilt-swivel screen
    Tilt-swivel vs tilt-only
    Tilt and swivel the screen for maximum shooting flexibility
  • Eye-level viewfinder
    Eye-level vs Rear display only
    You'll be able to frame photos even when the sun is out
  • Bigger pixels
    ~ 4.29 vs 1.34 microns
    Better low-light and dynamic range (all else equal)
  • RAW file ability
    Yes vs No
    Gives you more flexibility to develop your photos later
  • Built-in Wi-Fi
    Wi-Fi vs None
    Share your photos wirelessly
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Longer stills battery life
    More info 410 vs 300 shots
    Capture more photos
  • Manual focus
    Yes vs No
    AF is for the weak. Real photographers focus manually.
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • More dots on screen
    922k vs 460k dots
    Can mean greater resolution or a brighter screen
  • Hot shoe
    Hot shoe vs None
    Off-camera flashes open new possibilities
  • More pixels
    20.1 vs 16.0 megapixels
    Higher resolution photos
  • Longer exposure
    30 vs 4 sec
    Long exposures for night shots
  • Bulb shutter
    Bulb vs No bulb
    Hold the shutter open manually for long exposures
  • Bigger JPEG buffer
    28 vs 6 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster shutter
    1/6000 vs 1/2000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    51200 vs 6400 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Rear display
    Both provide
    Review photos on the back of the camera
  • In-Camera Image Stabilization
    Both provide
    Reduces the effects of camera shake at slower shutter speeds
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video

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
  • Integrated ND filter
    Neither provide
    Shoot in daylight with a large aperture or slow shutter
  • Dual card slots
    Neither provide
    Gives you more storage flexibility
  • Headphone jack
    Neither provide
    Monitor audio recording while you shoot video

User reviews

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Buy the Olympus TG-850
Olympus TG-850

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Buy the Pentax K-S2
Body Only (White)
  • Body Only (White)
  • Body Only (Black)
  • Body Only (Black/Orange)
  • Kit with 18-50mm WR Lens (Black)
  • Kit with 18-50mm WR Lens (Black/Orange)
  • Kit with 18-50mm WR Lens (White)
All K-S2 Deals

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 Panasonic TS5

Olympus TG-850
Panasonic TS5
  • $249
  • 1/2.3 inch
  • Less expensive
  • Tiltable Screen
  • $249
  • 1/2.33 inch
  • Built-in Wi-Fi
  • NFC

Compare Olympus TG-850 vs Panasonic TS5

Pentax K-S2
Panasonic TS5
  • $499
  • APS-C
  • Focus peaking
  • Larger sensor
  • $249
  • 1/2.33 inch
  • Less expensive
  • Waterproof

Compare Pentax K-S2 vs Panasonic TS5

Compared to Pentax K-500

Olympus TG-850
Pentax K-500
  • $249
  • 1/2.3 inch
  • Less expensive
  • Waterproof
  • $597
  • APS-C
  • Focus peaking
  • Larger sensor

Compare Olympus TG-850 vs 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

Compared to Pentax K-S1

Olympus TG-850
Pentax K-S1
  • $249
  • 1/2.3 inch
  • Less expensive
  • Waterproof
  • $502
  • APS-C
  • Focus peaking
  • Larger sensor

Compare Olympus TG-850 vs 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

Compared to Olympus TG-860

Olympus TG-850
Olympus TG-860
  • $249
  • 1/2.3 inch
  • $230
  • 1/2.3 inch
  • Built-in Wi-Fi
  • Built-in GPS

Compare Olympus TG-850 vs Olympus TG-860

Pentax K-S2
Olympus TG-860
  • $499
  • APS-C
  • Tilt-swivel screen
  • Focus peaking
  • $230
  • 1/2.3 inch
  • Less expensive
  • Waterproof

Compare Pentax K-S2 vs Olympus TG-860

Compared to Olympus TG-870

Olympus TG-850
Olympus TG-870
  • $249
  • 1/2.3 inch
  • $279
  • 1/2.3 inch
  • Built-in Wi-Fi
  • Built-in GPS

Compare Olympus TG-850 vs Olympus TG-870

Pentax K-S2
Olympus TG-870
  • $499
  • APS-C
  • Tilt-swivel screen
  • Focus peaking
  • $279
  • 1/2.3 inch
  • Waterproof
  • In-camera panoramas

Compare Pentax K-S2 vs Olympus TG-870

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