• 35mm 861.6mm2
  • 24.5 megapixels
  • ISO 100 - 1600
  • $8000 MSRP
  • 2.17 inch 1,452.0mm2
  • 40.0 megapixels
  • ISO 100 - 1600
  • $4697 Average Retail $9996 MSRP

Buy From

Advantages

Nikon D3X over Pentax 645D

  • Lens selection
    Excellent vs Limited
    Better lens selection gives you more options
  • Fast startup
    0.30 vs 0.70 sec
    Faster startup lets you catch the moment
  • Longer battery life
    4400 vs 800 shots
    Capture more photos
  • External Mic
    Jack vs No jack
    Improved sound fidelity when shooting video
  • 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
    Unlimited vs 21 shots
    Take more JPEG shots before waiting (single-shot mode)
  • Faster RAW shooting
    4.0 fps vs 0.9 fps
    Faster RAW shooting in single-shot mode
  • Bigger RAW buffer
    31 vs 17 shots
    Larger buffer for RAW shots (single-shot mode)
  • Faster JPEG shooting
    4.3 fps vs 0.9 fps
    Faster JPEG shooting (single-shot mode)
  • 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 over Nikon D3X

  • Larger sensor
    2.17 inch vs 35mm
    More sensor area. Bigger is (generally) better.
  • 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

Review Excerpt

The Competition

Compared to Canon 5D Mark II

Nikon D3X
Canon 5D Mark II
  • $8000
  • 35mm
  • Fast startup
  • Longer battery life
  • $3552
  • 35mm
  • 1080p
  • Higher extended ISO
Pentax 645D
Canon 5D Mark II
  • $4697
  • 2.17 inch
  • Larger sensor
  • More pixels
  • $3552
  • 35mm
  • Lens selection
  • Fast startup

Compared to Canon 1D X

Nikon D3X
Canon 1D X
  • $8000
  • 35mm
  • Fast startup
  • Longer battery life
  • $6387
  • 35mm
  • 60p
  • More cross-type AF points
Pentax 645D
Canon 1D X
  • $4697
  • 2.17 inch
  • Larger sensor
  • More pixels
  • $6387
  • 35mm
  • Lens selection
  • Fast startup

Compared to Nikon D800

Nikon D3X
Nikon D800
  • $8000
  • 35mm
  • Longer battery life
  • Faster RAW shooting
  • $2770
  • 35mm
  • 60p
  • Headphone jack
Pentax 645D
Nikon D800
  • $4697
  • 2.17 inch
  • Larger sensor
  • $2770
  • 35mm
  • Lens selection
  • Fast startup

Compared to Canon 5D Mark III

Nikon D3X
Canon 5D Mark III
  • $8000
  • 35mm
  • Fast startup
  • Longer battery life
  • $3180
  • 35mm
  • 60p
  • More cross-type AF points
Pentax 645D
Canon 5D Mark III
  • $4697
  • 2.17 inch
  • Larger sensor
  • More pixels
  • $3180
  • 35mm
  • Lens selection
  • Fast startup

Compared to Nikon D610

Nikon D3X
Nikon D610
  • $8000
  • 35mm
  • Longer battery life
  • More cross-type AF points
  • $2444
  • 35mm
  • 60p
  • Headphone jack
Pentax 645D
Nikon D610
  • $4697
  • 2.17 inch
  • Larger sensor
  • More pixels
  • $2444
  • 35mm
  • Lens selection
  • Fast startup
Compare Other Cameras?
  1. Welcome

    This is our newly designed camera comparison feature!

    Would you like to take a quick tour?

  2. At a Glance

    Here are a few features that give an at-a-glance view of the cameras.

  3. Purchase from our trusted partners

    Purchasing cameras (or any other products) through our trusted retailers helps support this content!

  4. Comparative Advantages

    These are what we think are the key advantages of each camera over the other.

  5. Review Excerpts

    What you see here is an excerpt of the pros and cons for these cameras from our reviews.

    You can click to see the review page for each camera, or ask us to review them if we haven’t already

  6. The Competition

    Here are some other competitors that you might be interested in.

  7. A Competitor, In Brief

    This is a brief summary of the comparison.

    Click to view the full analysis!

  8. Choose Another Matchup

    Click on a camera name or manufacturer to choose a different camera to compare.