• Medium format 1,452.0mm2
  • 40.0 megapixels
  • ISO 200 - 1000
  • APS-C 366.6mm2
  • 24.1 megapixels
  • ISO 100 - 6400

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Differences

Pentax 645D advantages over Nikon D7100

  • Larger sensor
    Medium format vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.06 vs 3.92 microns
    Better low-light and dynamic range (all else equal)
  • Less shutter lag
    0.16 vs 0.25 sec
    Focus and take a photo quickly (wide angle)
  • More viewfinder magnification
    0.78x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    40.0 vs 24.1 megapixels
    Higher resolution photos
  • Bigger JPEG buffer
    19 vs 12 shots
    Take more JPEG shots before waiting (burst mode)
  • Bigger RAW buffer
    16 vs 5 shots
    Larger buffer for RAW shots (burst mode)

Nikon D7100 advantages over Pentax 645D

  • Lens selection
    Excellent vs Limited
    Better lens selection gives you more options
  • Fast startup
    ~0.30 vs 0.7 sec
    Faster startup lets you catch the moment
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Thinner
    76 mm vs 119 mm
    Thinner
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More cross-type AF points
    15 vs 11
    Cross-type AF points improve autofocus performance
  • Higher max flash sync
    1/250 vs 1/125 sec
    Reduce the effect of ambient light in flash shots
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • More AF points
    51 vs 11
    More AF points improve autofocus
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Faster JPEG shooting
    5.8 fps vs 1.1 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    5.3 fps vs 1.1 fps
    Faster RAW shooting in burst mode
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    25600 vs 1600 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
  • Top deck display
    Both provide
    Check settings with a screen on top of the camera
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Dual card slots
    Both provide
    Gives you more storage flexibility
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • Focus peaking
    Neither provide
    Your camera will highlight what's in focus
  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • In-Camera Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • 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 Nikon D7100

Review Excerpt

  • Very high-resolution 40-megapixel sensor; Plentiful controls with great placement; Excellent optical viewfinder; Dual SDHC card slots; Infrared remote sensors front and back.

  • High price tag; Aliasing artifacts; Produces ~70MB RAW files.

  • 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

Pentax 645D
Canon 70D
  • $3599
  • Medium format
  • Larger sensor
  • Bigger pixels
  • $999
  • APS-C
  • Tilt-swivel screen
  • Lens selection
Nikon D7100
Canon 70D
  • $695
  • APS-C
  • Fast startup
  • Higher effective ISO
  • $999
  • APS-C
  • Tilt-swivel screen
  • Touchscreen

Compared to Leica S2

Pentax 645D
Leica S2
  • $3599
  • Medium format
  • Less expensive
  • More cross-type AF points
  • $22995
  • Medium format
  • Thinner
  • More viewfinder magnification
Nikon D7100
Leica S2
  • $695
  • APS-C
  • Lens selection
  • Internal flash
  • $22995
  • Medium format
  • Larger sensor
  • Bigger pixels

Compared to Leica S (Typ 006)

Pentax 645D
Leica S (Typ 006)
  • $3599
  • Medium format
  • Less expensive
  • Higher effective ISO
  • $10535
  • Medium format
  • Thinner
  • More viewfinder magnification
Nikon D7100
Leica S (Typ 006)
  • $695
  • APS-C
  • Lens selection
  • Higher effective ISO
  • $10535
  • Medium format
  • Larger sensor
  • Bigger pixels

Compared to Pentax K-3

Pentax 645D
Pentax K-3
  • $3599
  • Medium format
  • Larger sensor
  • Bigger pixels
  • $699
  • APS-C
  • Lens selection
  • Focus peaking
Nikon D7100
Pentax K-3
  • $695
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization

Compared to Pentax 645Z

Pentax 645D
Pentax 645Z
  • $3599
  • Medium format
  • Fast startup
  • Longer stills battery life
  • $4845
  • Medium format
  • Focus peaking
  • Tiltable Screen
Nikon D7100
Pentax 645Z
  • $695
  • APS-C
  • Lens selection
  • Less expensive
  • $4845
  • Medium format
  • Focus peaking
  • Larger sensor
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