• 35mm 861.6mm2
  • 24.5 megapixels
  • ISO 100 - 1600
  • 2.17 inch 1,452.0mm2
  • 40.0 megapixels
  • ISO 200 - 1000

Buy From

Differences

Nikon D3X 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
  • Longer battery life
    4400 vs 800 shots
    Capture more photos
  • More cross-type AF points
    15 vs 11
    Cross-type AF points improve autofocus performance
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Thinner
    87 mm vs 119 mm
    Thinner
  • More AF points
    51 vs 11
    More AF points improve autofocus
  • Higher max flash sync
    1/250 vs 1/125 sec
    Reduce the effect of ambient light in flash shots
  • Bigger JPEG buffer
    31 vs 19 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster JPEG shooting
    5.0 fps vs 1.1 fps
    Faster JPEG shooting (burst mode)
  • Has anti-aliasing filter
    Filter vs No Filter
    Reduces unsightly moiré in photos and video
  • Higher extended ISO
    6400 vs 1600 ISO
    Higher extended ISO can give more low-light flexibility
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light

Pentax 645D advantages over Nikon D3X

  • Larger sensor
    2.17 inch vs 35mm
    More sensor area. Bigger is (generally) better.
  • Less expensive
    $4250 vs $6999
    Save money for lenses or accessories
  • More pixels
    40.0 vs 24.5 megapixels
    Higher resolution photos
  • Newer
    4 years vs 6 years old
    Newer cameras often support more advanced features
  • Lacks anti-aliasing filter
    No Filter vs Filter
    Enjoy sharper photos

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
  • Dual card slots
    Both provide
    Gives you more storage flexibility
  • HDMI out
    Both provide
    Use an external screen 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

  • Focus peaking
    Neither provide
    Your camera will highlight what's in focus
  • Tiltable Screen
    Neither provide
    Tilt the screen for shooting flexbility
  • Touchscreen
    Neither provide
    Select your focus point more intuitively.
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • In-Camera Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • Wi-Fi
    Neither provide
    Share your photos wirelessly
  • GPS
    Neither provide
    Geotag your photos
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • Headphone jack
    Neither provide
    Monitor audio recording while you shoot video
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

Buy From

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.

The Competition

Compared to Canon 5D Mark II

Nikon D3X
Canon 5D Mark II
  • $7062
  • 35mm
  • Fast startup
  • Longer battery life
  • $2550
  • 35mm
  • Less expensive
  • Shoots 1080p video
Pentax 645D
Canon 5D Mark II
  • $4276
  • 2.17 inch
  • Larger sensor
  • More viewfinder magnification
  • $2550
  • 35mm
  • Lens selection
  • Less expensive

Compared to Leica S2

Nikon D3X
Leica S2
  • $7062
  • 35mm
  • Less expensive
  • Lens selection
  • $10000
  • 2.13 inch
  • Larger sensor
  • More pixels
Pentax 645D
Leica S2
  • $4276
  • 2.17 inch
  • Less expensive
  • More cross-type AF points
  • $10000
  • 2.13 inch
  • Thinner

Compared to Canon 1D Mark IV

Nikon D3X
Canon 1D Mark IV
  • $7062
  • 35mm
  • Larger sensor
  • Fast startup
  • $4999
  • APS-H
  • More cross-type AF points
  • Shoots 1080p video
Pentax 645D
Canon 1D Mark IV
  • $4276
  • 2.17 inch
  • Larger sensor
  • More viewfinder magnification
  • $4999
  • APS-H
  • Lens selection
  • Fast startup

Compared to Leica S

Nikon D3X
Leica S
  • $7062
  • 35mm
  • Less expensive
  • Lens selection
  • $10000
  • 2.13 inch
  • Larger sensor
  • More pixels
Pentax 645D
Leica S
  • $4276
  • 2.17 inch
  • Less expensive
  • More cross-type AF points
  • $10000
  • 2.13 inch
  • Thinner
  • Newer

Compared to Pentax 645Z

Nikon D3X
Pentax 645Z
  • $7062
  • 35mm
  • Lens selection
  • Fast startup
  • $8154
  • 2.15 inch
  • Focus peaking
  • Larger sensor
Pentax 645D
Pentax 645Z
  • $4276
  • 2.17 inch
  • Less expensive
  • Fast startup
  • $8154
  • 2.15 inch
  • Focus peaking
  • Tiltable Screen
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