Pentax K-S1 vs Panasonic GX8

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Pentax K-S1 vs Panasonic GX8

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

Go in depth with our full Pentax K-S1 Review.

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

Go in depth with our full Panasonic GX8 Review.
How does it shoot? Panasonic GX8 in the real world.
See real-world photos taken with the GX8.
Compare Panasonic GX8 image quality against competitors.
What’s the bottom line? Read our Panasonic GX8 conclusion.

Succeeded by the Panasonic GX9
Compare GX8 vs GX9
Compare Pentax K-S1 vs Panasonic GX9

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Differences

Pentax K-S1 advantages over Panasonic GX8

Larger sensor
APS-C vs 4/3
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 4.29 vs 3.34 microns
Better low-light and dynamic range (all else equal)
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.
K-S1 test data on DxO Mark GX8 test data on DxO Mark

1,061 vs 806 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

480 vs 340 shots
Capture more photos
Internal flash
Internal flash vs None
Useful in a pinch for fill flash
Optional anti-aliasing filter
Optional vs Fixed
Lets you choose sharper photos or reduced moiré
Higher extended ISO
51200 vs 25600 ISO
Higher extended ISO can give more low-light flexibility

Panasonic GX8 advantages over Pentax K-S1

Tilt-swivel screen
Tilt-swivel vs none
Tilt and swivel the screen for maximum shooting flexibility
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
Built-in Wi-Fi
Wi-Fi vs None
Share your photos wirelessly
NFC
Yes vs No
Simplifies pairing your camera with supported phones
External Mic Jack
Jack vs No jack
Improved sound fidelity when shooting video
More viewfinder magnification
0.77x vs 0.63x
Get a bigger view of the scene through the eye-level viewfinder
Longer exposure
60 vs 30 sec
Long exposures for night shots
Faster JPEG shooting
8.3 fps vs 5.4 fps
Faster JPEG shooting (burst mode)
Bigger JPEG buffer
Unlimited vs 20 shots
Take more JPEG shots before waiting (burst mode)
Faster shutter
1/16000 vs 1/6000 sec
Shoot wide open in bright light

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
HDMI out
Both provide
Use HDMI output to monitor or review video
Hot shoe
Both provide
Off-camera flashes open new possibilities
Bulb shutter
Both provide
Hold the shutter open manually for long exposures

Common Weaknesses

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
Top deck display
Neither provide
Check settings with a screen on top of the camera
Dual card slots
Neither provide
Gives you more storage flexibility
Headphone jack
Neither provide
Monitor audio recording while you shoot video
Slow-motion videos
Neither provide
Shoot slow-motion videos

User reviews

Amazon
Adorama
Read K-S1 User Reviews

Amazon
Adorama
Read GX8 User Reviews

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Review Excerpt

We haven’t reviewed the Pentax K-S1.
Read our Pentax K-S1 Preview

Highest resolution Micro Four Thirds camera yet; Great high ISO performance; Very fast autofocus; Fast burst mode with deep buffers; Impressive Dual I.S. system; Great 4K video.
No built-in flash; Slow buffer clearing; Below average battery life; Limited I.S. for 4K video.
Read our Panasonic GX8 Review

The Competition

Compared to Sony A58

Pentax K-S1

Sony A58

$502
APS-C

Lens selection
Higher effective ISO

$598
APS-C

Less expensive
In-camera panoramas

Compare Pentax K-S1 vs Sony A58

Panasonic GX8

Sony A58

$998
4/3

Lens selection
Tilt-swivel screen

$598
APS-C

Larger sensor
Bigger pixels

Compare Panasonic GX8 vs Sony A58

Compared to Olympus E-M1

Pentax K-S1

Olympus E-M1

$502
APS-C

Less expensive
Larger sensor

$1099
4/3

Touchscreen
Tiltable Screen

Compare Pentax K-S1 vs Olympus E-M1

Panasonic GX8

Olympus E-M1

$998
4/3

Tilt-swivel screen
Shoot 4K video

$1099
4/3

Fast startup
On-sensor phase detect

Compare Panasonic GX8 vs Olympus E-M1

Compared to Nikon D5500

Pentax K-S1

Nikon D5500

$502
APS-C

Focus peaking
In-Camera Image Stabilization

$697
APS-C

Tilt-swivel screen
Touchscreen

Compare Pentax K-S1 vs Nikon D5500

Panasonic GX8

Nikon D5500

$998
4/3

Focus peaking
In-Camera Image Stabilization

$697
APS-C

Less expensive
Larger sensor

Compare Panasonic GX8 vs Nikon D5500

Compared to Pentax K-S2

Pentax K-S1

Pentax K-S2

$502
APS-C

Higher-res screen

$499
APS-C

Tilt-swivel screen
Built-in Wi-Fi

Compare Pentax K-S1 vs Pentax K-S2

Panasonic GX8

Pentax K-S2

$998
4/3

Shoot 4K video
Touchscreen

$499
APS-C

Larger sensor
Bigger pixels

Compare Panasonic GX8 vs Pentax K-S2

Compared to Olympus E-M1 II

Pentax K-S1

Olympus E-M1 II

$502
APS-C

Larger sensor
Bigger pixels

$899
4/3

Tilt-swivel screen
Shoot 4K video

Compare Pentax K-S1 vs Olympus E-M1 II

Panasonic GX8

Olympus E-M1 II

$998
4/3

In-camera panoramas
NFC

$899
4/3

High resolution composite
Fast startup

Compare Panasonic GX8 vs Olympus E-M1 II

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