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Pentax K-3 Comparison Review

The Pentax K-3 is a DSLR (Digital Single Lens Reflex) camera that was revealed to the public in October 2013 and is equipped with an APS-C sensor. It offers a resolution of 24.1 megapixel.

camera

Is the Pentax K-3 a good camera? The K-3 has a Camera Elo of 2192. This rating puts the K-3 among the top 30 percent of all digital single lens reflex cameras. In terms of its sensor size category (APS cameras), the K-3 ranks among the top 40 percent. Based on its within category standings, the camera earns a 4-star performance rating.

Headline Specifications
Pentax K-3
Digital single lens reflex
Pentax K mount lenses
24.1 MP, APS-C Sensor
1080/60i Video
ISO 100 - 51 200
Optical viewfinder
3.2 LCD, 1037k dots
Fixed screen (not touch-sensitive)
8.3 shutter flaps per second
In-body stabilization
Weathersealed body
560 shots per battery charge
131 x 100 x 77 mm, 800 g


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Read on to find out more about the camera's size, sensor, features, reception by expert reviewers, and how it compares to other digital cameras.

Body comparison with a credit card

An illustration of the physical dimensions of the Pentax K-3 vis-à-vis a credit card is provided in the side-by-side display below. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth measures are rounded to the nearest millimeter.

Pentax K-3 vs credit card front
K-3 versus credit card top view
K-3 and credit card rear side

The table below summarizes the key physical specs of the Pentax K-3 alongside a set of similar cameras. If you want to review a particular camera pair side-by-side, just move across to the CAM-parator tool and choose from the broad selection of possible comparisons there.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299i
2.
 
Canon 70D 139 mm 104 mm 79 mm 755 g 920 Y Jul 2013 1,199i
3.
 
Nikon D7100 136 mm 107 mm 76 mm 765 g 950 Y Feb 2013 1,199i
4.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 1,099 i
5.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 649 i
6.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099i
7.
 
Pentax K-5 II 131 mm 97 mm 73 mm 760 g 740 Y Sep 2012 1,099i
8.
 
Pentax K-5 131 mm 97 mm 73 mm 760 g 740 Y Sep 2010 1,099i
9.
 
Sony RX10 129 mm 88 mm 102 mm 813 g 420 Y Oct 2013 1,299i
10.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 2,799i
11.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 1,399i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The Pentax K-3 was launched in the US market at a price of $1,299. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Pentax K-3:
Check Ebay offers

Sensor comparison with a 35mm slide

The size of the imaging sensor is a crucial determinant of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

The Pentax K-3 features an APS-C sensor and has a format factor (sometimes also referred to as "crop factor") of 1.5. Within the spectrum of camera sensors, this places the Pentax K-3 among the medium-sized sensor cameras that aim to strike a balance between image quality and portability.

Pentax K-3 sensor measures

Consistent information on actual sensor performance is available from DXO Mark for most cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of alternative cameras.

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Sensor Characteristics
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
2.
 
Canon 70D APS-C 20.0 5472 36481080/30p22.511.692668
3.
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683
4.
 
Pentax KP APS-C 24.1 6016 40001080/60i........
5.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i........
6.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
7.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
8.
 
Pentax K-5 APS-C 16.1 4928 32641080/25p23.714.1116282
9.
 
Sony RX10 1-inch 20.0 5472 36481080/60p22.912.647469
10.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589
11.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178

Many modern cameras cannot only take still pictures, but also record videos. The K-3 indeed provides movie recording capabilities. The highest resolution format that the K-3 can use is 1080/60i.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the K-3 has an optical viewfinder that provides a field of view of 100% and a magnification of 0.63x. The adjacent tables list some of the other core features of the Pentax K-3 along with similar information for a selection of comparators.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3 Y Y
2.
 
Canon 70Doptical Y3.0 / 1040 swivel Y 1/8000s 7.0 Y n
3.
 
Nikon D7100optical Y3.2 / 1229 fixed n 1/8000s 6.0 Y n
4.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0 Y Y
5.
 
Pentax K-70optical n3.0 / 921 swivel n 1/6000s 6.0 Y Y
6.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3 n Y
7.
 
Pentax K-5 IIoptical Y3.0 / 921 fixed n 1/8000s 7.0 Y Y
8.
 
Pentax K-5optical Y3.0 / 921 fixed n 1/8000s 7.0 Y Y
9.
 
Sony RX101440 Y3.0 / 1229 tilting n 1/3200s 10.0 Y Y
10.
 
Sony A992359 Y3.0 / 1229 full-flex n 1/8000s 6.0 n Y
11.
 
Sony A772359 Y3.0 / 921 full-flex n 1/8000s 12.0 Y Y

One convenient feature of the K-3 is the presence of an on-board flash. While this built-in flash is not very powerful, it can at times be useful as a fill-in light to brighten deep shadow areas.

Connection comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Pentax K-3 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
    Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax K-3Ymono / monoYYmini3.0---
2.
 
Canon 70DYstereo / monoY-mini2.0Y--
3.
 
Nikon D7100Ystereo / monoYYmini2.0---
4.
 
Pentax KPYstereo / monoY--2.0Y--
5.
 
Pentax K-70Ystereo / monoY-mini2.0Y--
6.
 
Pentax K-3 IIYmono / monoYYmini3.0---
7.
 
Pentax K-5 IIYstereo / monoY-mini2.0---
8.
 
Pentax K-5Ystereo / monoY-mini2.0---
9.
 
Sony RX10Ystereo / monoYYmicro2.0YY-
10.
 
Sony A99Ystereo / monoYYmini2.0---
11.
 
Sony A77Ystereo / monoY-mini2.0---

It is notable that the K-3 has a microphone port. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.

Expert reviews

While the specs-based evaluation of cameras is instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the K-3. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate. This is why hands-on reviews by experts are important. The following table reports the overall rankings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]).

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Review Scores
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299i
2.
 
Canon 70D5/5+ +..83/1004.5/55/5 Jul 2013 1,199i
3.
 
Nikon D71005/5+ +..85/1004.5/54.5/5 Feb 2013 1,199i
4.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 1,099 i
5.
 
Pentax K-704.5/5....79/1004.5/54.5/5 Jun 2016 649 i
6.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 1,099i
7.
 
Pentax K-5 II5/5....80/1005/54.5/5 Sep 2012 1,099i
8.
 
Pentax K-54/5....83/1005/54.5/5 Sep 2010 1,099i
9.
 
Sony RX105/5+..80/1004.5/54.5/5 Oct 2013 1,299i
10.
 
Sony A995/5....84/1004.5/54.5/5 Sep 2012 2,799i
11.
 
Sony A775/591/100..81/100..5/5 Aug 2011 1,399i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.

Pentax K-3 FAQ

Below are some additional questions and answers concerning some particular features of the K-3.

What type of imaging sensor is used in the K-3?

The camera has a CMOS (Complementary Metal–Oxide–Semiconductor) sensor at its core.

Which image processing chip is used to convert the raw signal into an image file and perform noise reduction and image sharpening?

Pentax equipped the K-3 with the PRIME III image processor.

What is the ISO sensitivity range of the K-3?

The camera has a native sensitivity range from ISO 100 to ISO 51200.

What is the life expectancy of the shutter in the Pentax K-3?

Pentax mentions a shutter rating of 200 000 actuations for the K-3. This number represents a Mean Time before Failure, that is an average value. The shutter might fail earlier, or it might last longer. Anyway, in order to exhaust the expected shutter life of the K-3 over, say, three years, one would have to take about 200 pictures each and every day.

How do I find the shutter count on my K-3?

Pentax embeds the number of shutter actuations in image metadata. You can check the number of shots that your K-3 has taken up to now by uploading a recent image to the free online shutter count finder app.

Do I need to purchase an external camera trigger to shoot time-lapse sequences?

No, the Pentax K-3 has an intervalometer built-in, so that low frequency shooting (for example, flower blooming, sunset, moon rise) can be undertaken without the need to purchase a separate external intervalometer and related software.

Is it difficult to use manual focus lenses with the Pentax K-3?

The K-3 offers focus peaking as a manual focus aid. This feature works by placing a colored highlight on in-focus zones within the image.

Does the Pentax K-3 feature an autofocus assist light?

Yes, the camera has a lamp built-in that can illuminate the subject and improve autofocus in low-light settings.

What is the fastest shutter speed that can be used with flash?

The K-3's flash sync speed is 1/180 sec.

Does the Pentax K-3 support the Ultra High Speed (UHS) bus interface for SD cards?

Yes, the camera can indeed use UHS-I cards (data transfer speed of up to 104 MB/s).

Which battery does the K-3 use?

The camera gets its power from the D-LI90 (here at amazon), which is a rechargeable Lithium-Ion power pack.

Is there a vertical grip available for the K-3?

Yes, Pentax offers the D-BG5 as an optional accessory to facilitate shooting in portrait orientation and to provide additional battery power.

Camera to camera comparisons

In case you are interested in seeing how this camera compares to another one, just make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications Summary
    Camera Model Pentax K-3
    Camera Type Digital single lens reflex
    Camera Lens Pentax K mount lenses
    Launch Date October 2013
    Launch Price USD 1 299
    Sensor Specs
    Sensor Technology CMOS
    Sensor Format APS-C Sensor
    Sensor Size 23.5 x 15.6 mm
    Sensor Area 367 mm2
    Sensor Diagonal 28.2 mm
    Crop Factor 1.5x
    Sensor Resolution 24.1 Megapixels
    Image Resolution 6 016 x 4 000 pixels
    Pixel Pitch 3.90 μm
    Pixel Density 6.56 MP/cm2
    Moiré control no AA filter
    Movie Capability 1080/60i Video
    ISO Setting 100 - 51 200 ISO
    Image Processor PRIME III
    DXO Sensor Quality (score) 80
    DXO Color Depth (bits) 23.7
    DXO Dynamic Range (EV) 13.4
    DXO Low Light (ISO) 1216
    Screen Specs
    Viewfinder Type Optical viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.63x
    Top-Level Screen Control Panel
    LCD Framing Live View
    LCD Size 3.2 inch
    LCD Resolution 1037k dots
    LCD Attachment Fixed screen
    V-logging Friendliness No front-flip
    Touch Input No touchscreen
    Shooting Specs
    Focus System Phase-detect AF
    Manual Focusing AidFocus Peaking
    Maximum Shutter Speed 1/8000s
    Continuous Shooting 8.3 shutter flaps/s
    Shutter Life Expectancy200 000 actuations
    Silent Shootingno E-Shutter
    Time Lapse PhotographyIntervalometer Built-in
    Image StabilizationIn-body stabilization
    Fill Flash Built-in Flash
    Storage Medium SDXC cards
    Second Storage Option Dual card slots
    UHS card support UHS-I
    Connectivity Specs
    External Flash Hotshoe
    Studio Flash PC Sync socket
    USB Connector USB 3.0
    HDMI Port mini HDMI
    Microphone Port External MIC port
    Headphone Socket Headphone port
    Wifi Support no Wifi
    Body Specs
    Environmental SealingWeathersealed body
    Battery Type D-LI90 power pack
    Battery Life (CIPA)560 shots per charge
    Body Dimensions 131 x 100 x 77 mm
    (5.2 x 3.9 x 3.0 in)
    Camera Weight 800 g (28.2 oz)

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