Nikon D300S vs Pentax K-3

Cameras
Compare Cameras
Nikon D300S vs Pentax K-3

Leave Feedback

APS-C 372.9mm²
12.3 megapixels
ISO 200 - 3200

Go in depth with our full Nikon D300S Review.
See real-world photos taken with the D300S.

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

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

Succeeded by the Nikon D500
Compare D300S vs D500

Succeeded by the Pentax K-3 II
Compare K-3 vs K-3 II

Compare NIKON D500 vs PENTAX K-3 II

Buy From

Differences

Nikon D300S advantages over Pentax K-3

Bigger pixels
~ 5.50 vs 3.91 microns
Better low-light and dynamic range (all else equal)
Fast startup
~0.30 vs 0.9 sec
Faster startup lets you catch the moment
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

950 vs 560 shots
Capture more photos
More AF points
51 vs 27
More AF points improve autofocus

Pentax K-3 advantages over Nikon D300S

Focus peaking
Peaker vs Non-peaker
Your camera will highlight what's in focus
In-Camera Image Stabilization
Yes vs No
Reduces the effects of camera shake at slower shutter speeds
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-3 test data on DxO Mark D300S test data on DxO Mark

1,216 vs 787 iso
Take photos in low light with less noise
More dynamic range

More dynamic range

Cameras with more dynamic range allow you to take photos with dramatic differences in highlight and shadow areas while retaining detail in both.

Think of a brilliant sunset on a rocky beach: Bright sunset in the background, with dark rocks in the foreground. High dynamic range means more of the extremes will be faithfully reproduced.

Dynamic range test data courtesy of DxO Mark.
K-3 test data on DxO Mark D300S test data on DxO Mark

13.4 vs 12.2 evs
Retain detail in highlight and shadows
More cross-type AF points
25 vs 15
Cross-type AF points improve autofocus performance
Shoots 1080p video
Yes vs No
You'll want this if you shoot video
Less shutter lag
0.14 vs 0.23 sec
Focus and take a photo quickly (wide angle)
More pixels
24.4 vs 12.3 megapixels
Higher resolution photos
Shoots 60p video
Yes vs No
A faster framerate can give you more editing options
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
Bigger JPEG buffer
75 vs 26 shots
Take more JPEG shots before waiting (burst mode)
Bigger RAW buffer
24 vs 17 shots
Larger buffer for RAW shots (burst mode)
Higher extended ISO
51200 vs 6400 ISO
Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

Eye-level viewfinder
Both provide
You'll be able to frame photos even when the sun is out
Internal flash
Both provide
Useful in a pinch for fill flash
Top deck display
Both provide
Check settings with a screen on top of the camera
External Mic Jack
Both provide
Improved sound fidelity when shooting video
Pentaprism viewfinder
Both provide
Much better viewfinder picture fidelity
HDMI out
Both provide
Use HDMI output to monitor or review video
Hot shoe
Both provide
Off-camera flashes open new possibilities
Dual card slots
Both provide
Gives you more storage flexibility
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
In-camera panoramas
Neither provide
Stitches multiple shots into a panoramic photo
Tiltable Screen
Neither provide
Tilt the screen for shooting flexbility
Built-in Wi-Fi
Neither provide
Share your photos wirelessly
NFC
Neither provide
Simplifies pairing your camera with supported phones
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
Slow-motion videos
Neither provide
Shoot slow-motion videos

User reviews

Amazon
Adorama
Read D300S User Reviews

Amazon
Adorama
Read K-3 User Reviews

Buy From

Your purchases support this site

Buy the Nikon D300S

Body Only

Body Only
Kit with 18-200mm Lens

All D300S Deals

Your purchases support this site

Buy the Pentax K-3

Body Only

Body Only
Kit with 18-135mm Lens

All K-3 Deals

Review Excerpt

Rugged construction; 51-point AF system capable of sophisticated AF tracking; Large, bright optical viewfinder; 7 fps JPEG or 12-bit RAW burst mode; HD Video capture.
14-bit RAW mode slows continuous shooting from 7 fps to 2.7 fps; Somewhat slow AF for a camera at this level, especially in 51-point auto-area mode; Video capture tops out at 720p24.
Read our Nikon D300S Full Review

Top-notch image quality; Great ergonomics in a compact body; Unique on-demand low-pass filtering; Broad sensitivity range; Large and bright viewfinder for an APS-C camera; Dual card slots; Optional Wi-Fi remote control
AE Lock button is poorly located; Below-average battery life for a DSLR; Rather dated-looking menu system; Requires a different battery grip accessory than its predecessors; Less third-party support than some rivals
Read our Pentax K-3 Review

The Competition

Compared to Nikon D90

Nikon D300S

Nikon D90

$1697
APS-C

External Mic Jack
More cross-type AF points

$1300
APS-C

Higher effective ISO
Bigger JPEG buffer

Compare Nikon D300S vs Nikon D90

Pentax K-3

Nikon D90

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$1300
APS-C

Bigger pixels
Fast startup

Compare Pentax K-3 vs Nikon D90

Compared to Canon 50D

Nikon D300S

Canon 50D

$1697
APS-C

Higher effective ISO
Longer stills battery life

$1000
APS-C

Less shutter lag
More pixels

Compare Nikon D300S vs Canon 50D

Pentax K-3

Canon 50D

$699
APS-C

Less expensive
Focus peaking

$1000
APS-C

Bigger pixels
Fast startup

Compare Pentax K-3 vs Canon 50D

Compared to Sony DSLR-A550

Nikon D300S

Sony DSLR-A550

$1697
APS-C

Lens selection
Fast startup

$859
APS-C

In-Camera Image Stabilization
Tiltable Screen

Compare Nikon D300S vs Sony DSLR-A550

Pentax K-3

Sony DSLR-A550

$699
APS-C

Lens selection
Focus peaking

$859
APS-C

Bigger pixels
Tiltable Screen

Compare Pentax K-3 vs Sony DSLR-A550

Compared to Nikon D7100

Nikon D300S

Nikon D7100

$1697
APS-C

Bigger pixels
Has anti-aliasing filter

$690
APS-C

Less expensive
Higher effective ISO

Compare Nikon D300S vs Nikon D7100

Pentax K-3

Nikon D7100

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$690
APS-C

Fast startup
Longer stills battery life

Compare Pentax K-3 vs Nikon D7100

Compared to Nikon D5300

Nikon D300S

Nikon D5300

$1697
APS-C

Bigger pixels
Fast startup

$549
APS-C

Less expensive
Tilt-swivel screen

Compare Nikon D300S vs Nikon D5300

Pentax K-3

Nikon D5300

$699
APS-C

Focus peaking
In-Camera Image Stabilization

$549
APS-C

Tilt-swivel screen
Fast startup

Compare Pentax K-3 vs Nikon D5300

Compare Other Cameras?