• 2.17 inch 1,452.0mm2
  • 40.0 megapixels
  • ISO 200 - 1000
  • 35mm 861.6mm2
  • 36.3 megapixels
  • ISO 100 - 6400

Buy From

Advantages

Pentax 645D over Nikon D800

  • Larger sensor
    2.17 inch vs 35mm
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.06 vs 4.88 microns
    Better low-light and dynamic range (all else equal)
  • Lacks anti-aliasing filter
    No Filter vs Filter
    Enjoy sharper photos

Nikon D800 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
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot 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
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • Lighter weight
    1008g vs 1480g
    Lighter weight
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Bigger JPEG buffer
    Unlimited vs 21 shots
    Take more JPEG shots before waiting (single-shot mode)
  • Faster RAW shooting
    2.6 fps vs 0.9 fps
    Faster RAW shooting in single-shot mode
  • Has anti-aliasing filter
    Filter vs No Filter
    Reduces unsightly moiré in photos and video
  • Faster JPEG shooting
    2.4 fps vs 0.9 fps
    Faster JPEG shooting (single-shot mode)
  • Higher extended ISO
    25600 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

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.

  • Rugged build; Excellent controls; Extremely high resolution; Dual cards; Surprising high ISO performance.

  • Very large files; Slower frame rate; Custom white balance gives a greenish tint; Battery life lower than D700.

The Competition

Compared to Canon 1D X

Pentax 645D
Canon 1D X
  • $4396
  • 2.17 inch
  • Larger sensor
  • More pixels
  • $5999
  • 35mm
  • Lens selection
  • Fast startup
Nikon D800
Canon 1D X
  • $1908
  • 35mm
  • Fast startup
  • Headphone jack
  • $5999
  • 35mm
  • Bigger pixels
  • More cross-type AF points

Compared to Sony A99

Pentax 645D
Sony A99
  • $4396
  • 2.17 inch
  • Larger sensor
  • Longer battery life
  • $1998
  • 35mm
  • Focus peaking
  • Lens selection
Nikon D800
Sony A99
  • $1908
  • 35mm
  • Lens selection
  • Fast startup
  • $1998
  • 35mm
  • Focus peaking
  • Tiltable Screen

Compared to Canon 6D

Pentax 645D
Canon 6D
  • $4396
  • 2.17 inch
  • Larger sensor
  • More cross-type AF points
  • $1399
  • 35mm
  • Lens selection
  • Fast startup
Nikon D800
Canon 6D
  • $1908
  • 35mm
  • Fast startup
  • More cross-type AF points
  • $1399
  • 35mm
  • Bigger pixels
  • Wi-Fi

Compared to Nikon D610

Pentax 645D
Nikon D610
  • $4396
  • 2.17 inch
  • Larger sensor
  • More pixels
  • $1497
  • 35mm
  • Lens selection
  • Fast startup
Nikon D800
Nikon D610
  • $1908
  • 35mm
  • More cross-type AF points
  • More pixels
  • $1497
  • 35mm
  • Bigger pixels
  • Newer

Compared to Pentax 645Z

Pentax 645D
Pentax 645Z
  • $4396
  • 2.17 inch
  • Fast startup
  • Bigger RAW buffer
  • $8434
  • 2.15 inch
  • Focus peaking
  • Tiltable Screen
Nikon D800
Pentax 645Z
  • $1908
  • 35mm
  • Lens selection
  • Fast startup
  • $8434
  • 2.15 inch
  • Focus peaking
  • Larger sensor
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