Canon 5D Mark III vs Panasonic GX850

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Canon 5D Mark III vs Panasonic GX850

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35mm 864.0mm²
22.3 megapixels
ISO 100 - 25,600

Go in depth with our full Canon 5D Mark III Review.
See real-world photos taken with the 5D Mark III.
Compare Canon 5D Mark III image quality against competitors.
What’s the bottom line? Read our Canon 5D Mark III conclusion.

4/3 224.9mm²
16.0 megapixels
ISO 200 - 25,600

Go in depth with our full Panasonic GX850 Review.
How does it shoot? Panasonic GX850 in the real world.
See real-world photos taken with the GX850.
Compare Panasonic GX850 image quality against competitors.
What’s the bottom line? Read our Panasonic GX850 conclusion.

Succeeded by the Canon 5D Mark IV
Compare 5D Mark III vs 5D Mark IV
Compare Canon 5D Mark IV vs Panasonic GX850

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Differences

Canon 5D Mark III advantages over Panasonic GX850

Larger sensor
35mm vs 4/3
More sensor area. Bigger is (generally) better.
Eye-level viewfinder
Eye-level vs Rear display only
You'll be able to frame photos even when the sun is out
Bigger pixels
~ 6.25 vs 3.77 microns
Better low-light and dynamic range (all else equal)
Fast startup
~0.50 vs 2.0 sec
Faster startup lets you catch the moment
Higher effective ISO

Higher effective ISO

Maximum effective ISO is an estimate of the highest sensitivity at which a camera can capture excellent quality photos.

Cameras with higher effective ISO will be better choices for indoor photography, night shooting, and indoor sports photography, especially if you intend to make large prints.

You can learn more at our glossary entry.

Maximum effective ISO test data courtesy of DxO Mark.
5D Mark III test data on DxO Mark GX850 test data on DxO Mark

2,293 vs 586 iso
Take photos in low light with less noise
Longer stills battery life
More info

Longer stills battery life

Cameras with longer battery life can take more photos before exhausting their batteries.

Special note: The measurement standard for battery life stipulates that if a camera has an internal flash, it must be used for 50% of photos taken. For this reason, comparisons of one camera with an internal flash to another without will not be comparable

950 vs 210 shots
Capture more photos
Top deck display
Yes vs No
Check settings with a screen on top of the camera
External Mic Jack
Jack vs No jack
Improved sound fidelity when shooting video
Higher max flash sync
1/200 vs 1/50 sec
Reduce the effect of ambient light in flash shots
Hot shoe
Hot shoe vs None
Off-camera flashes open new possibilities
Less shutter lag
0.12 vs 0.23 sec
Focus and take a photo quickly (wide angle)
More pixels
22.3 vs 16.0 megapixels
Higher resolution photos
Dual card slots
Yes vs No
Gives you more storage flexibility
Headphone jack
Yes vs No
Monitor audio recording while you shoot video
Has anti-aliasing filter
Filter vs No Filter
Reduces unsightly moiré in photos
Higher extended ISO
102400 vs 25600 ISO
Higher extended ISO can give more low-light flexibility

Panasonic GX850 advantages over Canon 5D Mark III

Focus peaking
Peaker vs Non-peaker
Your camera will highlight what's in focus
Shoot 4K video
4K (UHD) vs 1080p
Make sure you have a fast computer
Touchscreen
Touch vs No touch
Interact with your camera just like your smartphone
In-camera panoramas
Yes vs No
Stitches multiple shots into a panoramic photo
Tiltable Screen
Tiltable vs Fixed
Tilt the screen for shooting flexbility
Built-in Wi-Fi
Wi-Fi vs None
Share your photos wirelessly
More dynamic range

More dynamic range

Cameras with more dynamic range allow you to take photos with dramatic differences in highlight and shadow areas while retaining detail in both.

Think of a brilliant sunset on a rocky beach: Bright sunset in the background, with dark rocks in the foreground. High dynamic range means more of the extremes will be faithfully reproduced.

Dynamic range test data courtesy of DxO Mark.
GX850 test data on DxO Mark 5D Mark III test data on DxO Mark

13.3 vs 11.7 evs
Retain detail in highlight and shadows
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
Thinner
33 mm vs 76 mm
Thinner
Newer
8 years vs 13 years old
Newer cameras often support more advanced features
Lacks anti-aliasing filter
No Filter vs Filter
Enjoy sharper photos
Longer exposure
60 vs 30 sec
Long exposures for night shots
Faster JPEG shooting
9.3 fps vs 6.0 fps
Faster JPEG shooting (burst mode)
Bigger JPEG buffer
114 vs 63 shots
Take more JPEG shots before waiting (burst mode)
Faster RAW shooting
9.5 fps vs 6.0 fps
Faster RAW shooting in burst mode
Faster shutter
1/16000 vs 1/8000 sec
Shoot wide open in bright light

Similarities

Common Strengths

HDMI out
Both provide
Use HDMI output to monitor or review video
Bulb shutter
Both provide
Hold the shutter open manually for long exposures

Common Weaknesses

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
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

Amazon
Adorama
Read GX850 User Reviews

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Kit with 24-70mm Lens

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Buy the Panasonic GX850

Kit with 12-32mm Lens (Black)

Kit with 12-32mm Lens (Black)
Kit with 12-32mm Lens (Silver)

All GX850 Deals

Review Excerpt

Superb still and video image quality; Powerful, fast, and accurate AF system with loads of cross-type points, loads of configurability and great frame coverage; Rugged, weather-sealed body with great control layout and user-interface configurability.
Dynamic range is limited by noise in deep shadows; Somewhat heavy-handed noise suppression and sharpening at default settings. (Shooting RAW avoids both.); No AF illuminator.
Read our Canon 5D Mark III Review

Impressive image quality; Sleek design; 4K video recording; Good overall performance; Tilting touchscreen; Enjoyable user experience.
No EVF; No hot shoe, Short 4K clip limit; MicroSD card slot, Poor battery life.
Read our Panasonic GX850 Review

The Competition

Compared to Canon 6D

Canon 5D Mark III

Canon 6D

$2079
35mm

More cross-type AF points
Less shutter lag

$1499
35mm

Less expensive
Built-in Wi-Fi

Compare Canon 5D Mark III vs Canon 6D

Panasonic GX850

Canon 6D

$548
4/3

Focus peaking
Shoot 4K video

$1499
35mm

Larger sensor
Eye-level viewfinder

Compare Panasonic GX850 vs Canon 6D

Compared to Canon 5D Mark IV

Canon 5D Mark III

Canon 5D Mark IV

$2079
35mm

Less expensive
Bigger pixels

$2249
35mm

Shoot 4K video
Touchscreen

Compare Canon 5D Mark III vs Canon 5D Mark IV

Panasonic GX850

Canon 5D Mark IV

$548
4/3

Focus peaking
In-camera panoramas

$2249
35mm

Larger sensor
Eye-level viewfinder

Compare Panasonic GX850 vs Canon 5D Mark IV

Compared to Sony A850

Canon 5D Mark III

Sony A850

$2079
35mm

Lens selection
Higher effective ISO

$2219
35mm

In-Camera Image Stabilization

Compare Canon 5D Mark III vs Sony A850

Panasonic GX850

Sony A850

$548
4/3

Lens selection
Focus peaking

$2219
35mm

Larger sensor
Eye-level viewfinder

Compare Panasonic GX850 vs Sony A850

Compared to Nikon D800E

Canon 5D Mark III

Nikon D800E

$2079
35mm

Bigger pixels
More cross-type AF points

$2212
35mm

Fast startup
Higher effective ISO

Compare Canon 5D Mark III vs Nikon D800E

Panasonic GX850

Nikon D800E

$548
4/3

Less expensive
Focus peaking

$2212
35mm

Larger sensor
Eye-level viewfinder

Compare Panasonic GX850 vs Nikon D800E

Compared to Sony A99

Canon 5D Mark III

Sony A99

$2079
35mm

Lens selection
Fast startup

$1998
35mm

Focus peaking
Tilt-swivel screen

Compare Canon 5D Mark III vs Sony A99

Panasonic GX850

Sony A99

$548
4/3

Lens selection
Less expensive

$1998
35mm

Larger sensor
Tilt-swivel screen

Compare Panasonic GX850 vs Sony A99

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