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Panasonic GX850 vs Pentax K-3 III

The Panasonic Lumix DMC-GX850 (called Panasonic GX800 in some regions) and the Pentax K-3 III are two digital cameras that were officially introduced, respectively, in January 2017 and March 2021. The GX850 is a mirrorless interchangeable lens camera, while the K-3 III is a DSLR. The cameras are based on a Four Thirds (GX850) and an APS-C (K-3 III) sensor. The Panasonic has a resolution of 15.8 megapixels, whereas the Pentax provides 25.6 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Panasonic GX850
versus
Pentax K-3 III
Panasonic GX850   Pentax K-3 III
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Pentax K mount lenses
15.8 MP – Four Thirds sensor 25.6 MP – APS-C sensor
4K/30p Video 4K/30p Video
ISO 200-25,600 ISO 100-160,000
No viewfinder, LCD framing Optical viewfinder
3.0" LCD – 1040k dots 3.2" LCD – 1620k dots
Tilting touchscreen Fixed touchscreen
10 shutter flaps per second 12 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
210 shots per battery charge800 shots per battery charge
107 x 65 x 33 mm, 269 g 135 x 104 x 74 mm, 820 g
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Check K-3 III price at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Panasonic Lumix DMC-GX850 and the Pentax K-3 III? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

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Body comparison

The physical size and weight of the Panasonic GX850 and the Pentax K-3 III are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All size dimensions are rounded to the nearest millimeter.

The GX850 can be obtained in three different colors (black, silver, red), while the K-3 III is available in two color-versions (black, silver).

Size Panasonic GX850 vs Pentax K-3 III
Compare GX850 versus K-3 III top
Comparison GX850 or K-3 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-3 III is considerably larger (102 percent) than the Panasonic GX850. Moreover, the K-3 III is substantially heavier (205 percent) than the GX850. It is noteworthy in this context that the K-3 III is splash and dust-proof, while the GX850 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the GX850 gets 210 shots out of its Panasonic DMW-BLH7 battery, while the K-3 III can take 800 images on a single charge of its Pentax D-LI90 power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

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Body Specifications
# image Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Panasonic GX850 107 mm 65 mm 33 mm 269 g 210 n Jan 2017 549ebay.com
2.
 
Pentax K-3 III 135 mm 104 mm 74 mm 820 g 800 Y Mar 2021 1,999 amazon.com
3.
 
Fujifilm X-H1 140 mm 97 mm 86 mm 673 g 310 Y Feb 2018 1,899ebay.com
4.
 
Olympus E-PL5 111 mm 64 mm 38 mm 325 g 360 n Sep 2012 599ebay.com
5.
 
Olympus E-PM2 110 mm 64 mm 34 mm 269 g 360 n Sep 2012 499ebay.com
6.
 
Panasonic GF7 107 mm 65 mm 33 mm 266 g 230 n Jan 2015 499ebay.com
7.
 
Panasonic G6 122 mm 85 mm 71 mm 390 g 340 n Apr 2013 599ebay.com
8.
 
Panasonic GF6 111 mm 65 mm 38 mm 323 g 340 n Apr 2013 499ebay.com
9.
 
Panasonic G5 120 mm 83 mm 71 mm 396 g 320 n Jul 2012 599ebay.com
10.
 
Panasonic GF5 108 mm 67 mm 37 mm 267 g 360 n Apr 2012 499ebay.com
11.
 
Panasonic G3 115 mm 84 mm 47 mm 336 g 270 n May 2011 599ebay.com
12.
 
Panasonic GF3 108 mm 67 mm 32 mm 264 g 300 n Jun 2011 549ebay.com
13.
 
Panasonic GX1 116 mm 68 mm 39 mm 318 g 320 n Nov 2011 699ebay.com
14.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 1,099ebay.com
15.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 649ebay.com
16.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099ebay.com
17.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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Any camera decision will obviously take relative prices into account. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The GX850 was launched at a markedly lower price (by 73 percent) than the K-3 III, which puts it into a different market segment. 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.

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Panasonic GX850 features a Four Thirds sensor and the Pentax K-3 III an APS-C sensor. The sensor area in the K-3 III is 60 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.5. The sensor in the GX850 has a native 4:3 aspect ratio, while the one in the K-3 III offers a 3:2 aspect.

Panasonic GX850 and Pentax K-3 III sensor measures

With 25.6MP, the K-3 III offers a higher resolution than the GX850 (15.8MP), but the K-3 III has marginally smaller individual pixels (pixel pitch of 3.76μm versus 3.77μm for the GX850). Yet, the K-3 III is a much more recent model (by 4 years and 2 months) than the GX850, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Pentax K-3 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-3 III for good quality output (200 dots per inch) amounts to 31 x 20.6 inches or 78.6 x 52.4 cm, for very good quality (250 dpi) 24.8 x 16.5 inches or 62.9 x 41.9 cm, and for excellent quality (300 dpi) 20.6 x 13.8 inches or 52.4 x 35 cm. The corresponding values for the Panasonic GX850 are 23 x 17.2 inches or 58.3 x 43.8 cm for good quality, 18.4 x 13.8 inches or 46.7 x 35 cm for very good quality, and 15.3 x 11.5 inches or 38.9 x 29.2 cm for excellent quality prints.

Unlike the GX850, the K-3 III has the capacity to capture high quality composite images (YESMP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Panasonic Lumix DMC-GX850 has a native sensitivity range from ISO 200 to ISO 25600, which can be extended to ISO 100-25600. The corresponding ISO settings for the Pentax K-3 III are ISO 100 to ISO 160000 (no boost).

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

GX850 versus K-3 III MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

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Sensor Characteristics
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Panasonic GX850 Four Thirds 15.8 4592 34484K/30p23.213.358673
2.
 
Pentax K-3 III APS-C 25.6 6192 41284K/30p24.213.7208385
3.
 
Fujifilm X-H1 APS-C 24.0 6000 40004K/30p24.013.3180682
4.
 
Olympus E-PL5 Four Thirds 15.9 4608 34561080/30p22.812.388972
5.
 
Olympus E-PM2 Four Thirds 15.9 4608 34561080/30p22.712.293272
6.
 
Panasonic GF7 Four Thirds 15.8 4592 34481080/60p22.712.387470
7.
 
Panasonic G6 Four Thirds 15.9 4608 34561080/60p21.311.563961
8.
 
Panasonic GF6 Four Thirds 15.8 4592 34481080/60i20.710.662254
9.
 
Panasonic G5 Four Thirds 15.9 4608 34561080/60p21.411.661861
10.
 
Panasonic GF5 Four Thirds 12.0 4000 30001080/60i20.510.057350
11.
 
Panasonic G3 Four Thirds 15.8 4592 34481080/60i21.010.666756
12.
 
Panasonic GF3 Four Thirds 12.0 4000 30001080/60i20.610.145950
13.
 
Panasonic GX1 Four Thirds 15.8 4592 34481080/60p20.810.670355
14.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
15.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i23.813.1163980
16.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
17.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, and both provide the same movie specifications (4K/30p).

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the K-3 III has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the GX850 relies on live view and the rear LCD for framing. The adjacent table lists some of the other core features of the Panasonic GX850 and Pentax K-3 III along with similar information for a selection of comparators.

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Core Features
# image Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Panasonic GX850none n3.0 / 1040 tilting Y 1/500s 10.0/s Y n
2.
 
Pentax K-3 IIIoptical Y3.2 / 1620 fixed Y 1/8000s 12.0/s n Y
3.
 
Fujifilm X-H13690 Y3.0 / 1040 full-flex Y 1/8000s 14.0/s n Y
4.
 
Olympus E-PL5optional n3.0 / 460 tilting Y 1/4000s 8.0/s n Y
5.
 
Olympus E-PM2optional n3.0 / 460 fixed Y 1/4000s 8.0/s n Y
6.
 
Panasonic GF7none n3.0 / 1040 tilting Y 1/500s 5.8/s Y n
7.
 
Panasonic G61440 n3.0 / 1036 swivel Y 1/4000s 7.0/s Y n
8.
 
Panasonic GF6none n3.0 / 1040 tilting Y 1/4000s 4.2/s Y n
9.
 
Panasonic G51440 n3.0 / 920 swivel Y 1/4000s 6.0/s Y n
10.
 
Panasonic GF5none n3.0 / 920 fixed Y 1/4000s 4.0/s Y n
11.
 
Panasonic G31440 n3.0 / 460 swivel Y 1/4000s 4.0/s Y n
12.
 
Panasonic GF3none n3.0 / 460 fixed Y 1/4000s 3.2/s Y n
13.
 
Panasonic GX1optional n3.0 / 460 fixed Y 1/4000s 4.2/s Y n
14.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0/s Y Y
15.
 
Pentax K-70optical n3.0 / 921 swivel n 1/6000s 6.0/s Y Y
16.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
17.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One difference between the cameras concerns the presence of an on-board flash. The GX850 has one, while the K-3 III does not. While the built-in flash of the GX850 is not very powerful, it can at times be useful as a fill-in light.

The GX850 has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the K-3 III does not have a selfie-screen.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the GX850 is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Panasonic GX850 and the Pentax K-3 III both have an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

Concerning the storage of imaging data, both the GX850 and the K-3 III write their files to SDXC cards. The K-3 III features dual card slots, which can be very useful in case a memory card fails. In contrast, the GX850 only has one slot. The K-3 III supports UHS-II cards (on its first slot), while the GX850 can use UHS-I cards.

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Connectivity 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 Panasonic Lumix DMC-GX850 and Pentax K-3 III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
# image Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Panasonic GX850-stereo / mono--micro2.0Y--
2.
 
Pentax K-3 IIIYstereo / monoYYmicro3.2Y-Y
3.
 
Fujifilm X-H1Ystereo / monoY-micro3.0Y--
4.
 
Olympus E-PL5Ystereo / mono--mini2.0---
5.
 
Olympus E-PM2Ystereo / mono--mini2.0---
6.
 
Panasonic GF7-stereo / mono--micro2.0YY-
7.
 
Panasonic G6Ystereo / monoY-mini2.0YY-
8.
 
Panasonic GF6-stereo / mono--mini2.0YY-
9.
 
Panasonic G5Ystereo / mono--mini2.0---
10.
 
Panasonic GF5-stereo / mono--mini2.0---
11.
 
Panasonic G3Ystereo / mono--mini2.0---
12.
 
Panasonic GF3-stereo / mono--mini2.0---
13.
 
Panasonic GX1Ystereo / mono--mini2.0---
14.
 
Pentax KPYstereo / monoY--2.0Y--
15.
 
Pentax K-70Ystereo / monoY-mini2.0Y--
16.
 
Pentax K-3 IIYmono / monoYYmini3.0---
17.
 
Pentax K-3Ymono / monoYYmini3.0---
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It is notable that the K-3 III has a headphone jack, which makes it possible to attach external headphones and monitor the quality of sound during the recording process. The GX850 lacks such a headphone port.

Studio photographers will appreciate that the Pentax K-3 III (unlike the GX850) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Travel and landscape photographers will find it useful that the K-3 III has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

The K-3 III is a recent model that features in the current product line-up of Pentax. In contrast, the GX850 has been discontinued (but can be found pre-owned on ebay). There has not been a direct replacement model for the GX850 from Panasonic. Further information on the features and operation of the GX850 and K-3 III can be found, respectively, in the Panasonic GX850 Manual (free pdf) or the online Pentax K-3 III Manual.

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Review summary

So how do things add up? Which of the two cameras – the Panasonic GX850 or the Pentax K-3 III – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Panasonic Lumix DMC-GX850:

  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (107x65mm vs 135x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 551g or 67 percent) and hence easier to carry around.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced category (73 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in January 2017).

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Advantages of the Pentax K-3 III:

  • More detail: Has more megapixels (25.6 vs 15.8MP), which boosts linear resolution by 30%.
  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (1620k vs 1040k dots).
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/500s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 10 flaps/sec) to capture the decisive moment.
  • Longer lasting: Gets more shots (800 versus 210) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • Faster data transfer: Supports a more advanced USB protocol (3.2 vs 2.0).
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
  • More modern: Reflects 4 years and 2 months of technical progress since the GX850 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the K-3 III is the clear winner of the contest (25 : 9 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

GX850 09:25 K-3 III

How about other alternatives? Do the specifications of the Panasonic GX850 and the Pentax K-3 III place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the GX850 or the K-3 III. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

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Expert Camera Reviews
# image  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Panasonic GX850..+..76/1004.5/54.5/5 Jan 2017 549ebay.com
2.
 
Pentax K-3 III4/5..3/5..4.5/5.. Mar 2021 1,999 amazon.com
3.
 
Fujifilm X-H1..+5/586/1004.5/54.5/5 Feb 2018 1,899ebay.com
4.
 
Olympus E-PL53/5+ +....4.5/54.5/5 Sep 2012 599ebay.com
5.
 
Olympus E-PM23/5....77/1005/54.5/5 Sep 2012 499ebay.com
6.
 
Panasonic GF74/5+....4.5/54.5/5 Jan 2015 499ebay.com
7.
 
Panasonic G64/5+ +....5/54.5/5 Apr 2013 599ebay.com
8.
 
Panasonic GF6..+ +....4.5/54.5/5 Apr 2013 499ebay.com
9.
 
Panasonic G53/5+ +....4.5/54.5/5 Jul 2012 599ebay.com
10.
 
Panasonic GF53/5......4.5/54.5/5 Apr 2012 499ebay.com
11.
 
Panasonic G33/5+ +..75/1004.5/55/5 May 2011 599ebay.com
12.
 
Panasonic GF33/582/100..71/1004.5/54/5 Jun 2011 549ebay.com
13.
 
Panasonic GX13/5+..77/1004.5/54.5/5 Nov 2011 699ebay.com
14.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 1,099ebay.com
15.
 
Pentax K-704.5/5..4/579/1004.5/54.5/5 Jun 2016 649ebay.com
16.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 1,099ebay.com
17.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Panasonic GX850 vs Pentax K-3 III

    Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

    Camera Specifications
    Camera Model Panasonic GX850 Pentax K-3 III
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Pentax K mount lenses
    Launch Date January 2017 March 2021
    Launch Price USD 549 USD 1,999
    Sensor Specs Panasonic GX850 Pentax K-3 III
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor APS-C Sensor
    Sensor Size 17.3 x 13.0 mm 23.3 x 15.5 mm
    Sensor Area 224.9 mm2 361.15 mm2
    Sensor Diagonal 21.6 mm 28 mm
    Crop Factor 2.0x 1.5x
    Sensor Resolution 15.8 Megapixels 25.6 Megapixels
    Image Resolution 4592 x 3448 pixels 6192 x 4128 pixels
    Pixel Pitch 3.77 μm 3.76 μm
    Pixel Density 7.04 MP/cm2 7.08 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video 4K/30p Video
    ISO Setting 200 - 25,600 ISO 100 - 160,000 ISO
    ISO Boost 100 - 25,600 ISO no Enhancement
    Image Processor Venus PRIME V
    DXO Sensor Quality (score) 73 ..
    DXO Color Depth (bits) 23.2 ..
    DXO Dynamic Range (EV) 13.3 ..
    DXO Low Light (ISO) 586 ..
    Screen Specs Panasonic GX850 Pentax K-3 III
    Viewfinder Type no viewfinder Optical viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.70x
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 1040k dots 1620k dots
    LCD Attachment Tilting screen Fixed screen
    Touch Input Touchscreen Touchscreen
    Shooting Specs Panasonic GX850 Pentax K-3 III
    Focus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/500s 1/8000s
    Continuous Shooting 10 shutter flaps/s 12 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support UHS-I Single UHS-II
    Connectivity Specs Panasonic GX850 Pentax K-3 III
    External Flash no Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 3.2
    HDMI Port micro HDMI micro HDMI
    Microphone Port no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Geotagging no internal GPS GPS built-in
    Body Specs Panasonic GX850 Pentax K-3 III
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Panasonic DMW-BLH7 Pentax D-LI90
    Battery Life (CIPA)210 shots per charge800 shots per charge
    Body Dimensions 107 x 65 x 33 mm
    (4.2 x 2.6 x 1.3 in)
    135 x 104 x 74 mm
    (5.3 x 4.1 x 2.9 in)
    Camera Weight 269 g (9.5 oz) 820 g (28.9 oz)
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