Pentax K-3 vs Canon 1DX Mark III

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Pentax K-3 vs Canon 1DX Mark III

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APS-C 366.6mm²
24.4 megapixels
ISO 100 - 51,200

Go in depth with our full Pentax K-3 Review.
How does it shoot? Pentax K-3 in the real world.
See real-world photos taken with the K-3.
Compare Pentax K-3 image quality against competitors.
What’s the bottom line? Read our Pentax K-3 conclusion.

35mm 864.0mm²
20.1 megapixels
ISO 100 - 102,400

Go in depth with our full Canon 1DX Mark III Review.

Succeeded by the Pentax K-3 II
Compare K-3 vs K-3 II
Compare Pentax K-3 II vs Canon 1DX Mark III

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Differences

Pentax K-3 advantages over Canon 1DX Mark III

Focus peaking
Peaker vs Non-peaker
Your camera will highlight what's in focus
In-Camera Image Stabilization
Yes vs No
Reduces the effects of camera shake at slower shutter speeds
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
More pixels
24.4 vs 20.1 megapixels
Higher resolution photos
Optional anti-aliasing filter
Optional vs Fixed
Lets you choose sharper photos or reduced moiré

Canon 1DX Mark III advantages over Pentax K-3

Larger sensor
35mm vs APS-C
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 6.58 vs 3.91 microns
Better low-light and dynamic range (all else equal)
Shoot 4K video
No vs 1080p
Make sure you have a fast computer
Touchscreen
Touch vs No touch
Interact with your camera just like your smartphone
Built-in Wi-Fi
Wi-Fi vs None
Share your photos wirelessly
Built-in Bluetooth
Yes vs No
Always-on wireless connectivity
Built-in GPS
GPS vs None
Geotag your photos
On-sensor phase detect
Yes vs No
Usually improves live view and video AF performance
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

2850 vs 560 shots
Capture more photos
More cross-type AF points
155 vs 25
Cross-type AF points improve autofocus performance
Newer
5 years vs 11 years old
Newer cameras often support more advanced features
More dots on screen
2100k vs 1037k dots
Can mean greater resolution or a brighter screen
More viewfinder magnification
0.76x vs 0.63x
Get a bigger view of the scene through the eye-level viewfinder
More AF points
191 vs 27
More AF points improve autofocus
Faster JPEG shooting
20.0 fps vs 7.1 fps
Faster JPEG shooting (burst mode)
Bigger JPEG buffer
Unlimited vs 75 shots
Take more JPEG shots before waiting (burst mode)
Faster RAW shooting
20.0 fps vs 7.1 fps
Faster RAW shooting in burst mode
Bigger RAW buffer
Unlimited vs 24 shots
Larger buffer for RAW shots (burst mode)
Slow-motion videos
Yes vs No
Shoot slow-motion videos
Higher extended ISO
819200 vs 51200 ISO
Higher extended ISO can give more low-light flexibility

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
External Mic Jack
Both provide
Improved sound fidelity when shooting video
Pentaprism viewfinder
Both provide
Much better viewfinder picture fidelity
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

Tilt-swivel screen
Neither provide
Tilt and swivel the screen for maximum shooting flexibility
In-camera panoramas
Neither provide
Stitches multiple shots into a panoramic photo
Tiltable Screen
Neither provide
Tilt the screen for shooting flexbility
NFC
Neither provide
Simplifies pairing your camera with supported phones

User reviews

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Read K-3 User Reviews

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Kit with 18-135mm Lens

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Review Excerpt

Top-notch image quality; Great ergonomics in a compact body; Unique on-demand low-pass filtering; Broad sensitivity range; Large and bright viewfinder for an APS-C camera; Dual card slots; Optional Wi-Fi remote control
AE Lock button is poorly located; Below-average battery life for a DSLR; Rather dated-looking menu system; Requires a different battery grip accessory than its predecessors; Less third-party support than some rivals
Read our Pentax K-3 Review

We haven’t reviewed the Canon 1DX Mark III.
Read our Canon 1DX Mark III Preview

The Competition

Compared to Nikon D7100

Pentax K-3

Nikon D7100

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$690
APS-C

Fast startup
Longer stills battery life

Compare Pentax K-3 vs Nikon D7100

Canon 1DX Mark III

Nikon D7100

$6499
35mm

Larger sensor
Bigger pixels

$690
APS-C

Less expensive
Internal flash

Compare Canon 1DX Mark III vs Nikon D7100

Compared to Nikon D5300

Pentax K-3

Nikon D5300

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$549
APS-C

Tilt-swivel screen
Fast startup

Compare Pentax K-3 vs Nikon D5300

Canon 1DX Mark III

Nikon D5300

$6499
35mm

Larger sensor
Bigger pixels

$549
APS-C

Less expensive
Tilt-swivel screen

Compare Canon 1DX Mark III vs Nikon D5300

Compared to Nikon D7200

Pentax K-3

Nikon D7200

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$1016
APS-C

Fast startup
Built-in Wi-Fi

Compare Pentax K-3 vs Nikon D7200

Canon 1DX Mark III

Nikon D7200

$6499
35mm

Larger sensor
Bigger pixels

$1016
APS-C

Less expensive
NFC

Compare Canon 1DX Mark III vs Nikon D7200

Compared to Nikon D5

Pentax K-3

Nikon D5

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$4943
35mm

Larger sensor
Bigger pixels

Compare Pentax K-3 vs Nikon D5

Canon 1DX Mark III

Nikon D5

$6499
35mm

Built-in Wi-Fi
Built-in Bluetooth

$4943
35mm

Less expensive
Longer stills battery life

Compare Canon 1DX Mark III vs Nikon D5

Compared to Nikon D6

Pentax K-3

Nikon D6

$699
APS-C

Less expensive
Focus peaking

$6500
35mm

Larger sensor
Bigger pixels

Compare Pentax K-3 vs Nikon D6

Canon 1DX Mark III

Nikon D6

$6499
35mm

Built-in Wi-Fi
On-sensor phase detect

$6500
35mm

Longer exposure

Compare Canon 1DX Mark III vs Nikon D6

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