• APS-C 368.2mm2
  • 16.3 megapixels
  • 35.00mm (35mm eq.)
  • APS-C 361.2mm2
  • 25.7 megapixels
  • ISO 100 - 1,600,000

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Differences

Fujifilm X100S advantages over Pentax K-3 III

  • Bigger pixels
    ~ 4.82 vs 3.76 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • 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
  • Integrated ND filter
    Yes vs No
    Shoot in daylight with a large aperture or slow shutter
  • Thinner
    53 mm vs 73 mm
    Thinner
  • Higher max flash sync
    1/2000 vs 1/200 sec
    Reduce the effect of ambient light in flash shots
  • Lighter weight
    449g vs 820g
    Lighter weight

Pentax K-3 III advantages over Fujifilm X100S

  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • 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
  • 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
  • Longer stills battery life
    More info 800 vs 330 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
  • Newer
    4 years vs 12 years old
    Newer cameras often support more advanced features
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • Higher-res screen
    540k vs 153k pixels
    More detail on the screen lets you judge focus and composition
  • More viewfinder magnification
    1.05x vs 0.50x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    25.7 vs 16.3 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Faster JPEG shooting
    12.0 fps vs 5.7 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    30 vs 16 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    1600000 vs 25600 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Rear display
    Both provide
    Review photos on the back of the camera
  • 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
  • RAW file ability
    Both provide
    Gives you more flexibility to develop your photos later
  • Manual focus
    Both provide
    AF is for the weak. Real photographers focus manually.
  • 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
  • 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
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Your purchases support this site

Buy the Fujifilm X100S

Your purchases support this site

Buy the Pentax K-3 III

Review Excerpt

  • Attractive, retro rangefinder-style design; Improved (excellent) still image quality that's even better thanks to second generation X-Trans sensor technology; Great, sharp f/2 35mm-equivalent lens; Overall better operation and performance than the X100; Addition of phase-detect pixels makes bright light autofocusing faster.

  • Low-light AF slow and inconsistent; Video quality, even at 60p, compromised by moire and lack of image stabilization; Combined four-way pad/Command dial means AF control points cumbersome to change; Too easy to bump control dials and change settings accidentally (especially the EV dial).

The Competition

Compared to Fujifilm X100

Fujifilm X100S
Fujifilm X100
  • $1099
  • APS-C
  • Focus peaking
  • In-camera panoramas
  • $1200
  • APS-C
  • Shoots 24p video
Pentax K-3 III
Fujifilm X100
  • $1847
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1200
  • APS-C
  • Bigger pixels
  • Internal flash

Compared to Fujifilm X100T

Fujifilm X100S
Fujifilm X100T
  • $1099
  • APS-C
  • $1299
  • APS-C
  • Built-in Wi-Fi
  • External Mic Jack
Pentax K-3 III
Fujifilm X100T
  • $1847
  • APS-C
  • In-Camera Image Stabilization
  • Shoot 4K video
  • $1299
  • APS-C
  • Bigger pixels
  • In-camera panoramas

Compared to Fujifilm X100F

Fujifilm X100S
Fujifilm X100F
  • $1099
  • APS-C
  • Bigger pixels
  • $899
  • APS-C
  • Fast startup
  • Built-in Wi-Fi
Pentax K-3 III
Fujifilm X100F
  • $1847
  • APS-C
  • In-Camera Image Stabilization
  • Shoot 4K video
  • $899
  • APS-C
  • Less expensive
  • In-camera panoramas

Compared to Pentax KP

Fujifilm X100S
Pentax KP
  • $1099
  • APS-C
  • Bigger pixels
  • In-camera panoramas
  • $999
  • APS-C
  • In-Camera Image Stabilization
  • Tiltable Screen
Pentax K-3 III
Pentax KP
  • $1847
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $999
  • APS-C
  • Less expensive
  • Tiltable Screen

Compared to Canon 90D

Fujifilm X100S
Canon 90D
  • $1099
  • APS-C
  • Focus peaking
  • Bigger pixels
  • $1099
  • APS-C
  • Tilt-swivel screen
  • Shoot 4K video
Pentax K-3 III
Canon 90D
  • $1847
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1099
  • APS-C
  • Less expensive
  • Tilt-swivel screen
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