• 35mm 861.6mm2
  • 36.3 megapixels
  • ISO 100 - 6400
  • 4/3 226.2mm2
  • 20.4 megapixels
  • ISO 200 - 25,600

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Differences

Nikon D800 advantages over Olympus E-M1 Mark III

  • Larger sensor
    35mm vs 4/3
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 4.88 vs 3.36 microns
    Better low-light and dynamic range (all else equal)
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • More pixels
    36.3 vs 20.4 megapixels
    Higher resolution photos
  • Has anti-aliasing filter
    Filter vs No Filter
    Reduces unsightly moiré in photos

Olympus E-M1 Mark III advantages over Nikon D800

  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Shoot 4K video
    4K (DCI) vs 1080p
    Make sure you have a fast computer
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • Built-in Wi-Fi
    Wi-Fi vs None
    Share your photos wirelessly
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Newer
    5 years vs 13 years old
    Newer cameras often support more advanced features
  • Lighter weight
    580g vs 1008g
    Lighter weight
  • Lacks anti-aliasing filter
    No Filter vs Filter
    Enjoy sharper photos
  • Longer exposure
    60 vs 30 sec
    Long exposures for night shots
  • Faster shutter
    1/32000 vs 1/8000 sec
    Shoot wide open in bright light

Similarities

Common Strengths

  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • External Mic Jack
    Both provide
    Improved sound fidelity when shooting video
  • 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
  • Headphone jack
    Both provide
    Monitor audio recording while you shoot video
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • 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
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Buy the Nikon D800

Your purchases support this site

Buy the Olympus E-M1 Mark III
Body Only
  • Body Only
  • Kit with 12-100mm f/4 Lens
  • Kit with 12-40mm Lens
All E-M1 Mark III Deals

Review Excerpt

  • 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.

  • Read our Nikon D800 Review

The Competition

Compared to Canon 5D Mark III

Nikon D800
Canon 5D Mark III
  • $1850
  • 35mm
  • Fast startup
  • Higher effective ISO
  • $2799
  • 35mm
  • Bigger pixels
  • More cross-type AF points

Compare Nikon D800 vs Canon 5D Mark III

Olympus E-M1 Mark III
Canon 5D Mark III
  • $1699
  • 4/3
  • Focus peaking
  • Tilt-swivel screen
  • $2799
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Olympus E-M1 Mark III vs Canon 5D Mark III

Compared to Nikon D800E

Nikon D800
Nikon D800E
  • $1850
  • 35mm
  • Has anti-aliasing filter
  • $2212
  • 35mm
  • Lacks anti-aliasing filter

Compare Nikon D800 vs Nikon D800E

Olympus E-M1 Mark III
Nikon D800E
  • $1699
  • 4/3
  • Focus peaking
  • Tilt-swivel screen
  • $2212
  • 35mm
  • Larger sensor
  • Bigger pixels

Compare Olympus E-M1 Mark III vs Nikon D800E

Compared to Nikon D810

Nikon D800
Nikon D810
  • $1850
  • 35mm
  • Fast startup
  • Has anti-aliasing filter
  • $2997
  • 35mm
  • Longer stills battery life
  • Lacks anti-aliasing filter

Compare Nikon D800 vs Nikon D810

Olympus E-M1 Mark III
Nikon D810
  • $1699
  • 4/3
  • Focus peaking
  • Tilt-swivel screen
  • $2997
  • 35mm
  • Less expensive
  • Larger sensor

Compare Olympus E-M1 Mark III vs Nikon D810

Compared to Panasonic G95

Nikon D800
Panasonic G95
  • $1850
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $848
  • 4/3
  • Focus peaking
  • Tilt-swivel screen

Compare Nikon D800 vs Panasonic G95

Olympus E-M1 Mark III
Panasonic G95
  • $1699
  • 4/3
  • High resolution composite
  • On-sensor phase detect
  • $848
  • 4/3
  • Less expensive
  • In-camera panoramas

Compare Olympus E-M1 Mark III vs Panasonic G95

Compared to OM System OM-1

Nikon D800
OM System OM-1
  • $1850
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $2200
  • 4/3
  • Less expensive
  • Tilt-swivel screen

Compare Nikon D800 vs OM System OM-1

Olympus E-M1 Mark III
OM System OM-1
  • $1699
  • 4/3
  • $2200
  • 4/3
  • Newer
  • Higher-res screen

Compare Olympus E-M1 Mark III vs OM System OM-1

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