Pentax K-3 II vs Sony A7S II

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Pentax K-3 II vs Sony A7S II

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

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

35mm 847.3mm²
12.2 megapixels
ISO 100 - 102,400

Go in depth with our full Sony A7S II Review.
How does it shoot? Sony A7S II in the real world.
See real-world photos taken with the A7S II.
Compare Sony A7S II image quality against competitors.
What’s the bottom line? Read our Sony A7S II conclusion.

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Differences

Pentax K-3 II advantages over Sony A7S II

Lens selection
Excellent vs Good
Better lens selection gives you more options
Less expensive
$830 vs $2398
Save money for lenses or accessories
High resolution composite
Yes vs No
Combine multiple shots to form a super hi-res version
Fast startup
~1.20 vs 2.9 sec
Faster startup lets you catch the moment
Built-in GPS
GPS vs None
Geotag your photos
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

720 vs 370 shots
Capture more photos
Top deck display
Yes vs No
Check settings with a screen on top of the camera
More pixels
24.4 vs 12.2 megapixels
Higher resolution photos
Dual card slots
Yes vs No
Gives you more storage flexibility
Optional anti-aliasing filter
Optional vs Fixed
Lets you choose sharper photos or reduced moiré
Faster JPEG shooting
8.1 fps vs 5.0 fps
Faster JPEG shooting (burst mode)
Faster RAW shooting
8.2 fps vs 5.0 fps
Faster RAW shooting in burst mode

Sony A7S II advantages over Pentax K-3 II

Larger sensor
35mm vs APS-C
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 8.40 vs 3.91 microns
Better low-light and dynamic range (all else equal)
Shoot 4K video
4K (UHD) vs 1080p
Make sure you have a fast computer
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
NFC
Yes vs No
Simplifies pairing your camera with supported phones
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.
A7S II test data on DxO Mark K-3 II test data on DxO Mark

2,993 vs 1,106 iso
Take photos in low light with less noise
More viewfinder magnification
0.78x vs 0.63x
Get a bigger view of the scene through the eye-level viewfinder
Slow-motion videos
Yes vs No
Shoot slow-motion videos
Higher extended ISO
409600 vs 51200 ISO
Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

Focus peaking
Both provide
Your camera will highlight what's in focus
Eye-level viewfinder
Both provide
You'll be able to frame photos even when the sun is out
In-Camera Image Stabilization
Both provide
Reduces the effects of camera shake at slower shutter speeds
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
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
Touchscreen
Neither provide
Interact with your camera just like your smartphone
Built-in Bluetooth
Neither provide
Always-on wireless connectivity
On-sensor phase detect
Neither provide
Usually improves live view and video AF performance
Internal flash
Neither provide
Useful in a pinch for fill flash

User reviews

Amazon
Adorama
Read K-3 II User Reviews

Amazon
Adorama
Read A7S II User Reviews

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Review Excerpt

Top-notch image quality; Spectacular detail from Pixel Shift Resolution; Better performance than K-3; Geotag images with no accessories; Great ergonomics in a compact body; Clever on-demand low-pass filtering; Broad sensitivity range; Large and bright viewfinder for an APS-C camera; Dual card slots
No built-in flash strobe; No wireless flash support out of the box; AstroTracer function can be finicky; AE Lock button is poorly located; Below-average battery life for a prosumer DSLR; Requires a different battery grip accessory than its predecessors
Read our Pentax K-3 II Review

Comfortable and surprisingly compact camera body; Improved low light performance; Built-in image stabilization; Wide range of usable ISOs; More sophisticated autofocus performance; Excellent video capabilities.
Relatively low resolution; Mediocre continuous shooting performance; No built-in flash; No losslessly compressed RAW option.
Read our Sony A7S II Review

The Competition

Compared to Sony A7S

Pentax K-3 II

Sony A7S

$830
APS-C

Lens selection
Less expensive

$1998
35mm

Larger sensor
Bigger pixels

Compare Pentax K-3 II vs Sony A7S

Sony A7S II

Sony A7S

$2398
35mm

In-Camera Image Stabilization
Shoot 4K video

$1998
35mm

Less expensive
Fast startup

Compare Sony A7S II vs Sony A7S

Compared to Canon T6i

Pentax K-3 II

Canon T6i

$830
APS-C

Focus peaking
Larger sensor

$599
APS-C

Less expensive
Tilt-swivel screen

Compare Pentax K-3 II vs Canon T6i

Sony A7S II

Canon T6i

$2398
35mm

Focus peaking
Larger sensor

$599
APS-C

Lens selection
Less expensive

Compare Sony A7S II vs Canon T6i

Compared to Pentax KP

Pentax K-3 II

Pentax KP

$830
APS-C

Less expensive
Built-in GPS

$999
APS-C

Tiltable Screen
Built-in Wi-Fi

Compare Pentax K-3 II vs Pentax KP

Sony A7S II

Pentax KP

$2398
35mm

Larger sensor
Bigger pixels

$999
APS-C

Lens selection
Less expensive

Compare Sony A7S II vs Pentax KP

Compared to Canon T7i

Pentax K-3 II

Canon T7i

$830
APS-C

Focus peaking
Larger sensor

$700
APS-C

Tilt-swivel screen
Touchscreen

Compare Pentax K-3 II vs Canon T7i

Sony A7S II

Canon T7i

$2398
35mm

Focus peaking
Larger sensor

$700
APS-C

Lens selection
Less expensive

Compare Sony A7S II vs Canon T7i

Compared to Sony A9

Pentax K-3 II

Sony A9

$830
APS-C

Lens selection
Less expensive

$2995
35mm

Larger sensor
Bigger pixels

Compare Pentax K-3 II vs Sony A9

Sony A7S II

Sony A9

$2398
35mm

Less expensive
Bigger pixels

$2995
35mm

Touchscreen
Fast startup

Compare Sony A7S II vs Sony A9

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