Sigma fp vs Pentax K-3 III

Cameras
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Sigma fp vs Pentax K-3 III

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35mm 858.0mm²
24.6 megapixels
ISO 100 - 25,600

Go in depth with our full Sigma fp Review.
See real-world photos taken with the fp.

APS-C 361.2mm²
25.7 megapixels
ISO 100 - 1,600,000

Go in depth with our full Pentax K-3 III Review.
See real-world photos taken with the K-3 III.

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Differences

Sigma fp advantages over Pentax K-3 III

Less expensive
$1599 vs $2344
Save money for lenses or accessories
Larger sensor
35mm vs APS-C
More sensor area. Bigger is (generally) better.
Bigger pixels
~ 5.98 vs 3.76 microns
Better low-light and dynamic range (all else equal)
Thinner
45 mm vs 73 mm
Thinner
Lighter weight
422g vs 820g
Lighter weight
Faster JPEG shooting
18.0 fps vs 12.0 fps
Faster JPEG shooting (burst mode)
Slow-motion videos
Yes vs No
Shoot slow-motion videos

Pentax K-3 III advantages over Sigma fp

Eye-level viewfinder
Eye-level vs Rear display only
You'll be able to frame photos even when the sun is out
High resolution composite
Yes vs No
Combine multiple shots to form a super hi-res version
Built-in Wi-Fi
Wi-Fi vs None
Share your photos wirelessly
Built-in Bluetooth
Yes vs No
Always-on wireless connectivity
Top deck display
Yes vs No
Check settings with a screen on top of the camera
Higher max flash sync
1/200 vs 1/30 sec
Reduce the effect of ambient light in flash shots
Newer
4 years vs 5 years old
Newer cameras often support more advanced features
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 None
Lets you choose sharper photos or reduced moiré
Bigger JPEG buffer
30 vs 12 shots
Take more JPEG shots before waiting (burst mode)
Higher extended ISO
1600000 vs 102400 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
In-Camera Image Stabilization
Both provide
Reduces the effects of camera shake at slower shutter speeds
Shoot 4K video
Both provide
Make sure you have a fast computer
Touchscreen
Both provide
Interact with your camera just like your smartphone
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
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
Built-in GPS
Neither provide
Geotag your photos
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

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Adorama
Read fp User Reviews

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Adorama
Read K-3 III User Reviews

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Body Only
Kit with 45mm f/2.8 lens

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Buy the Pentax K-3 III

Body Only

Body Only
Kit with 20-40mm F2.8-4 Lens
Kit with 55-300mm f/4.5-6.3 Lens

All K-3 III Deals

Review Excerpt

We haven’t finished our review of the Sigma fp, but we have extensive sample photos and a hands-on report.
Read our Sigma fp Shooter's Report

We haven’t finished our review of the Pentax K-3 III, but we have extensive sample photos and a hands-on report.
See our Pentax K-3 III First Shots

The Competition

Compared to Pentax KP

Sigma fp

Pentax KP

$1699
35mm

Larger sensor
Bigger pixels

$999
APS-C

Less expensive
Eye-level viewfinder

Compare Sigma fp vs Pentax KP

Pentax K-3 III

Pentax KP

$1797
APS-C

Shoot 4K video
Touchscreen

$999
APS-C

Less expensive
Tiltable Screen

Compare Pentax K-3 III vs Pentax KP

Compared to Canon EOS RP

Sigma fp

Canon EOS RP

$1699
35mm

Focus peaking
Less expensive

$949
35mm

Tilt-swivel screen
Eye-level viewfinder

Compare Sigma fp vs Canon EOS RP

Pentax K-3 III

Canon EOS RP

$1797
APS-C

Focus peaking
In-Camera Image Stabilization

$949
35mm

Tilt-swivel screen
Larger sensor

Compare Pentax K-3 III vs Canon EOS RP

Compared to Canon 90D

Sigma fp

Canon 90D

$1699
35mm

Focus peaking
Larger sensor

$1099
APS-C

Less expensive
Tilt-swivel screen

Compare Sigma fp vs Canon 90D

Pentax K-3 III

Canon 90D

$1797
APS-C

Focus peaking
In-Camera Image Stabilization

$1099
APS-C

Less expensive
Tilt-swivel screen

Compare Pentax K-3 III vs Canon 90D

Compared to Sony A7C

Sigma fp

Sony A7C

$1699
35mm

Thinner
More dots on screen

$1598
35mm

Tilt-swivel screen
Eye-level viewfinder

Compare Sigma fp vs Sony A7C

Pentax K-3 III

Sony A7C

$1797
APS-C

Lens selection
High resolution composite

$1598
35mm

Less expensive
Tilt-swivel screen

Compare Pentax K-3 III vs Sony A7C

Compared to Sigma fp L

Sigma fp

Sigma fp L

$1699
35mm

Bigger pixels
Higher max flash sync

$2499
35mm

Newer
More pixels

Compare Sigma fp vs Sigma fp L

Pentax K-3 III

Sigma fp L

$1797
APS-C

Eye-level viewfinder
High resolution composite

$2499
35mm

Larger sensor
Thinner

Compare Pentax K-3 III vs Sigma fp L

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