Sony A5100 vs Pentax K-3 II

Cameras
Compare Cameras
Sony A5100 vs Pentax K-3 II

Leave Feedback

APS-C 366.6mm²
24.3 megapixels
ISO 100 - 25,600

Go in depth with our full Sony A5100 Review.
How does it shoot? Sony A5100 in the real world.
See real-world photos taken with the A5100.
Compare Sony A5100 image quality against competitors.
What’s the bottom line? Read our Sony A5100 conclusion.

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.

Buy From

Differences

Sony A5100 advantages over Pentax K-3 II

Less expensive
$448 vs $830*
Save money for lenses or accessories
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
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.
A5100 test data on DxO Mark K-3 II test data on DxO Mark

1,347 vs 1,106 iso
Take photos in low light with less noise
On-sensor phase detect
Yes vs No
Usually improves live view and video AF performance
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
Thinner
35 mm vs 77 mm
Thinner

Pentax K-3 II advantages over Sony A5100

Lens selection
Excellent vs Good
Better lens selection gives you more options
Eye-level viewfinder
Eye-level vs Rear display only
You'll be able to frame photos even when the sun is out
In-Camera Image Stabilization
Yes vs No
Reduces the effects of camera shake at slower shutter speeds
High resolution composite
Yes vs No
Combine multiple shots to form a super hi-res version
Fast startup
~1.20 vs 2.0 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 400 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-res screen
346k vs 230k pixels
More detail on the screen lets you judge focus and composition
Hot shoe
Hot shoe vs None
Off-camera flashes open new possibilities
Less shutter lag
0.14 vs 0.23 sec
Focus and take a photo quickly (wide angle)
Dual card slots
Yes vs No
Gives you more storage flexibility
Headphone jack
Yes vs No
Monitor audio recording while you shoot video
Optional anti-aliasing filter
Optional vs Fixed
Lets you choose sharper photos or reduced moiré
Faster JPEG shooting
8.1 fps vs 6.0 fps
Faster JPEG shooting (burst mode)
Faster RAW shooting
8.2 fps vs 6.0 fps
Faster RAW shooting in burst mode
Faster shutter
1/8000 vs 1/4000 sec
Shoot wide open in bright light
Higher extended ISO
51200 vs 25600 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
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
Built-in Bluetooth
Neither provide
Always-on wireless connectivity
Slow-motion videos
Neither provide
Shoot slow-motion videos

User reviews

Amazon
Adorama
Read A5100 User Reviews

Amazon
Adorama
Read K-3 II User Reviews

Buy From

Your purchases support this site

Buy the Sony A5100

Body Only (Black)

Body Only (Black)
Kit with 16-50mm Lens (Black)
Kit with 16-50mm Lens (White)

All A5100 Deals

Your purchases support this site

Buy the Pentax K-3 II

Body Only (Black)

All K-3 II Deals

Review Excerpt

Very small and comfortable form factor; Very good image quality for its class; New dual video record function; Quick autofocus and good dynamic range.
Lacks an EVF and external mode dial; No hot shoe; JPEG processing at higher ISOs not as good as some competing mid-level models.
Read our Sony A5100 Review

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

The Competition

Compared to Samsung NX1000

Sony A5100

Samsung NX1000

$348
APS-C

Lens selection
Focus peaking

$413
APS-C

Higher-res screen
Hot shoe

Compare Sony A5100 vs Samsung NX1000

Pentax K-3 II

Samsung NX1000

$830
APS-C

Lens selection
Focus peaking

$413
APS-C

Built-in Wi-Fi
Thinner

Compare Pentax K-3 II vs Samsung NX1000

Compared to Samsung NX1100

Sony A5100

Samsung NX1100

$348
APS-C

Lens selection
Focus peaking

$450
APS-C

Higher-res screen
Hot shoe

Compare Sony A5100 vs Samsung NX1100

Pentax K-3 II

Samsung NX1100

$830
APS-C

Lens selection
Focus peaking

$450
APS-C

Built-in Wi-Fi
Thinner

Compare Pentax K-3 II vs Samsung NX1100

Compared to Sony A5000

Sony A5100

Sony A5000

$348
APS-C

Touchscreen
Higher effective ISO

$298
APS-C

Less expensive

Compare Sony A5100 vs Sony A5000

Pentax K-3 II

Sony A5000

$830
APS-C

Lens selection
Eye-level viewfinder

$298
APS-C

Less expensive
In-camera panoramas

Compare Pentax K-3 II vs Sony A5000

Compared to Canon T6i

Sony A5100

Canon T6i

$348
APS-C

Less expensive
Focus peaking

$699
APS-C

Lens selection
Tilt-swivel screen

Compare Sony A5100 vs Canon T6i

Pentax K-3 II

Canon T6i

$830
APS-C

Focus peaking
Larger sensor

$699
APS-C

Less expensive
Tilt-swivel screen

Compare Pentax K-3 II vs Canon T6i

Compared to Pentax KP

Sony A5100

Pentax KP

$348
APS-C

Less expensive
Touchscreen

$999
APS-C

Lens selection
Eye-level viewfinder

Compare Sony A5100 vs 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

Compare Other Cameras?