• APS-C 366.6mm2
  • 24.1 megapixels
  • ISO 100 - 6400
  • APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200

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Differences

Nikon D7100 advantages over Pentax K-S1

  • Higher effective ISO
    1,256 vs 1,061 iso
    Take photos in low light with less noise
  • Longer stills battery life
    More info 950 vs 480 shots
    Capture more photos
  • More telephoto lens reach
    158 mm vs 83 mm
    Capture objects farther away with the kit lens
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More cross-type AF points
    15 vs 9
    Cross-type AF points improve autofocus performance
  • More pixels
    24.1 vs 20.1 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • More AF points
    51 vs 11
    More AF points improve autofocus
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video

Pentax K-S1 advantages over Nikon D7100

  • 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
  • Lighter weight
    765g vs 1222g
    Lighter weight
  • Optional anti-aliasing filter
    Optional vs None
    Lets you choose sharper photos or reduced moiré
  • Bigger JPEG buffer
    20 vs 12 shots
    Take more JPEG shots before waiting (burst mode)
  • Higher extended ISO
    51200 vs 25600 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
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • Pentaprism viewfinder
    Both provide
    Much better viewfinder picture fidelity
  • 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
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Neither provide
    Tilt the screen for shooting flexbility
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • NFC
    Neither provide
    Simplifies pairing your camera with supported phones
  • 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
  • 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

  • Solid, ergonomic body design; Stunning, highly detailed photos, thanks to 24.1MP sensor upgrade and removal of optical low-pass filter; Cool 1.3x crop mode extends reach to nearly 2x the full-frame equivalent; Records Full 1080p HD video at up to 30fps with full-time AF; Many pro-level features packed into a consumer-friendly body at reasonable price.

  • Shallow buffer that hampers continuous burst shooting; AF slightly slower than average for its class; No real-time aperture control while in Movie mode (among other quirks); More noticeable moire patterns and aliasing artifacts (but only found when shooting fabrics with strong, distinct patterns).

The Competition

Compared to Canon 70D

Nikon D7100
Canon 70D
  • $795
  • APS-C
  • Fast startup
  • Higher effective ISO
  • $899
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Pentax K-S1
Canon 70D
  • $399
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $899
  • APS-C
  • Tilt-swivel screen
  • Touchscreen

Compared to Pentax K-3

Nikon D7100
Pentax K-3
  • $795
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
Pentax K-S1
Pentax K-3
  • $399
  • APS-C
  • Lighter weight
  • $699
  • APS-C
  • Higher effective ISO
  • More telephoto lens reach

Compared to Nikon D5300

Nikon D7100
Nikon D5300
  • $795
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $571
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Pentax K-S1
Nikon D5300
  • $399
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $571
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi

Compared to Nikon D3300

Nikon D7100
Nikon D3300
  • $795
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $438
  • APS-C
  • Less expensive
  • In-camera panoramas
Pentax K-S1
Nikon D3300
  • $399
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $438
  • APS-C
  • In-camera panoramas
  • Higher effective ISO

Compared to Pentax K-S2

Nikon D7100
Pentax K-S2
  • $795
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $499
  • APS-C
  • Focus peaking
  • Less expensive
Pentax K-S1
Pentax K-S2
  • $399
  • APS-C
  • Higher-res screen
  • $499
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi
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