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Panasonic G100 vs Pentax K-3 III

The Panasonic Lumix DC-G100 (called Panasonic G110 in some regions) and the Pentax K-3 III are two digital cameras that were officially introduced, respectively, in June 2020 and March 2021. The G100 is a mirrorless interchangeable lens camera, while the K-3 III is a DSLR. The cameras are based on a Four Thirds (G100) and an APS-C (K-3 III) sensor. The Panasonic has a resolution of 20.2 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 G100
versus
Pentax K-3 III
Panasonic G100   Pentax K-3 III
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Pentax K mount lenses
20.2 MP – Four Thirds sensor 25.6 MP – APS-C sensor
4K/30p Video 4K/30p Video
ISO 200-25,600 ISO 100-160,000
Electronic viewfinder (3680k dots) Optical viewfinder
3.0" LCD – 1840k dots 3.2" LCD – 1620k dots
Swivel touchscreen Fixed touchscreen
10 shutter flaps per second 12 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
270 shots per battery charge800 shots per battery charge
116 x 83 x 54 mm, 352 g 135 x 104 x 74 mm, 820 g
logo
Check G100 price at
amazon.com
logo
Check K-3 III price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Panasonic Lumix DC-G100 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 G100 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 perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.

The K-3 III can be obtained in two different colors (black, silver), while the G100 is only available in black.

Size Panasonic G100 vs Pentax K-3 III
Compare G100 versus K-3 III top
Comparison G100 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 (46 percent) than the Panasonic G100. Moreover, the K-3 III is substantially heavier (133 percent) than the G100. It is noteworthy in this context that the K-3 III is splash and dust-proof, while the G100 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 G100 gets 270 shots out of its Panasonic DMW-BLG10 battery, while the K-3 III can take 800 images on a single charge of its Pentax D-LI90 power pack. The power pack in the G100 can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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 G100 116 mm 83 mm 54 mm 352 g 270 n Jun 2020 649 amazon.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.
 
Panasonic G95 130 mm 94 mm 77 mm 536 g 290 Y Apr 2019 999ebay.com
5.
 
Panasonic G7 125 mm 86 mm 77 mm 410 g 350 n May 2015 649ebay.com
6.
 
Panasonic G6 122 mm 85 mm 71 mm 390 g 340 n Apr 2013 599ebay.com
7.
 
Panasonic G5 120 mm 83 mm 71 mm 396 g 320 n Jul 2012 599ebay.com
8.
 
Panasonic G3 115 mm 84 mm 47 mm 336 g 270 n May 2011 599ebay.com
9.
 
Panasonic GX1 116 mm 68 mm 39 mm 318 g 320 n Nov 2011 699ebay.com
10.
 
Panasonic G2 124 mm 84 mm 74 mm 428 g 360 n Mar 2010 599ebay.com
11.
 
Panasonic GF2 113 mm 68 mm 33 mm 310 g 300 n Nov 2010 549ebay.com
12.
 
Panasonic GF1 119 mm 71 mm 36 mm 385 g 380 n Sep 2009 749ebay.com
13.
 
Panasonic G1 124 mm 84 mm 45 mm 360 g 410 n Sep 2008 599ebay.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 naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The G100 was launched at a markedly lower price (by 68 percent) than the K-3 III, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. 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.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Panasonic G100 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 G100 has a native 4:3 aspect ratio, while the one in the K-3 III offers a 3:2 aspect.

Panasonic G100 and Pentax K-3 III sensor measures

With 25.6MP, the K-3 III offers a higher resolution than the G100 (20.2MP), but the K-3 III nevertheless has larger individual pixels (pixel pitch of 3.76μm versus 3.34μm for the G100) due to its larger sensor. Moreover, the K-3 III is a somewhat more recent model (by 9 months) than the G100, and its sensor might have benefitted from technological advances during this time that further 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 G100 are 25.9 x 19.4 inches or 65.8 x 49.4 cm for good quality, 20.7 x 15.6 inches or 52.7 x 39.5 cm for very good quality, and 17.3 x 13 inches or 43.9 x 32.9 cm for excellent quality prints.

Unlike the G100, 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 DC-G100 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).

In terms of underlying technology, the G100 is build around a Live MOS sensor, while the K-3 III uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

G100 versus K-3 III MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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 following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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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 G100 Four Thirds 20.2 5184 38884K/30p23.313.2139176
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.
 
Panasonic G95 Four Thirds 20.2 5184 38884K/30p23.213.0127375
5.
 
Panasonic G7 Four Thirds 15.8 4592 34484K/30p22.812.490471
6.
 
Panasonic G6 Four Thirds 15.9 4608 34561080/60p21.311.563961
7.
 
Panasonic G5 Four Thirds 15.9 4608 34561080/60p21.411.661861
8.
 
Panasonic G3 Four Thirds 15.8 4592 34481080/60i21.010.666756
9.
 
Panasonic GX1 Four Thirds 15.8 4592 34481080/60p20.810.670355
10.
 
Panasonic G2 Four Thirds 12.0 4000 3000720/30p21.210.349353
11.
 
Panasonic GF2 Four Thirds 12.0 4000 30001080/60i21.210.350654
12.
 
Panasonic GF1 Four Thirds 12.0 4000 3000720/30p21.210.351354
13.
 
Panasonic G1 Four Thirds 12.0 4000 3000none21.110.346353
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 also of capturing video footage. 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 G100 has an electronic viewfinder (3680k dots), while the K-3 III has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the G100 has a higher magnification than the one of the K-3 III (0.73x vs 0.70x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The table below summarizes some of the other core capabilities of the Panasonic G100 and Pentax K-3 III in connection with corresponding information for a sample of similar cameras.

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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 G1003680 n3.0 / 1840 swivel 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.
 
Panasonic G952360 n3.0 / 1240 swivel Y 1/4000s 9.0/s Y Y
5.
 
Panasonic G72360 n3.0 / 1040 swivel Y 1/4000s 7.0/s Y n
6.
 
Panasonic G61440 n3.0 / 1036 swivel Y 1/4000s 7.0/s Y n
7.
 
Panasonic G51440 n3.0 / 920 swivel Y 1/4000s 6.0/s Y n
8.
 
Panasonic G31440 n3.0 / 460 swivel Y 1/4000s 4.0/s Y n
9.
 
Panasonic GX1optional n3.0 / 460 fixed Y 1/4000s 4.2/s Y n
10.
 
Panasonic G21440 n3.0 / 460 swivel Y 1/4000s 2.6/s Y n
11.
 
Panasonic GF2optional n3.0 / 460 fixed Y 1/4000s 2.6/s Y n
12.
 
Panasonic GF1optional n3.0 / 460 fixed n 1/4000s 3.0/s Y n
13.
 
Panasonic G11440 n3.0 / 460 swivel n 1/4000s 3.0/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.
padding

One difference between the cameras concerns the presence of an on-board flash. The G100 has one, while the K-3 III does not. While the built-in flash of the G100 is not very powerful, it can at times be useful as a fill-in light.

The G100 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 G100 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 G100 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 G100 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 G100 only has one slot. The K-3 III supports UHS-II cards (on its first slot), while the G100 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 DC-G100 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 G100Ystereo / monoYYmicro2.0Y-Y
2.
 
Pentax K-3 IIIYstereo / monoYYmicro3.2Y-Y
3.
 
Fujifilm X-H1Ystereo / monoY-micro3.0Y--
4.
 
Panasonic G95Ystereo / monoYYmicro2.0Y-Y
5.
 
Panasonic G7Ystereo / monoY-micro2.0Y--
6.
 
Panasonic G6Ystereo / monoY-mini2.0YY-
7.
 
Panasonic G5Ystereo / mono--mini2.0---
8.
 
Panasonic G3Ystereo / mono--mini2.0---
9.
 
Panasonic GX1Ystereo / mono--mini2.0---
10.
 
Panasonic G2Ystereo / mono--mini2.0---
11.
 
Panasonic GF2Ystereo / mono--mini2.0---
12.
 
Panasonic GF1Ymono / mono--mini2.0---
13.
 
Panasonic G1Y- / ---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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Studio photographers will appreciate that the Pentax K-3 III (unlike the G100) 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.

Both the G100 and the K-3 III are recent models that are part of the current product line-up. The G100 replaced the earlier Panasonic G95, while the K-3 III followed on from the Pentax K-3 II. Further information on the features and operation of the G100 and K-3 III can be found, respectively, in the Panasonic G100 Manual (free pdf) or the online Pentax K-3 III Manual.

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Review summary

So what is the bottom line? Is there a clear favorite between the Panasonic G100 and the Pentax K-3 III? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.

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Reasons to prefer the Panasonic Lumix DC-G100:

  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.73x vs 0.70x).
  • More detailed LCD: Has a higher resolution rear screen (1840k vs 1620k dots).
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or 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 (116x83mm vs 135x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 468g or 57 percent) and hence easier to carry around.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • 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 (68 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in June 2020).

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Arguments in favor of the Pentax K-3 III:

  • More detail: Has more megapixels (25.6 vs 20.2MP), which boosts linear resolution by 15%.
  • 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.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • 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.
  • 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 270) 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.
  • 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).
  • 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: Was introduced somewhat (9 months) more recently.

If the count of relative strengths (bullet points above) is taken as a measure, the K-3 III is the clear winner of the contest (20 : 13 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision. 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.

G100 13:20 K-3 III

How about other alternatives? Do the specifications of the Panasonic G100 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the G100 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 where reviews by experts come in. 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 G1004/5..4/578/1004/54/5 Jun 2020 649 amazon.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.
 
Panasonic G954.5/5+4.5/583/1004.5/54.5/5 Apr 2019 999ebay.com
5.
 
Panasonic G74/5+ +3.5/580/1005/54.5/5 May 2015 649ebay.com
6.
 
Panasonic G64/5+ +....5/54.5/5 Apr 2013 599ebay.com
7.
 
Panasonic G53/5+ +....4.5/54.5/5 Jul 2012 599ebay.com
8.
 
Panasonic G33/5+ +..75/1004.5/55/5 May 2011 599ebay.com
9.
 
Panasonic GX13/5+..77/1004.5/54.5/5 Nov 2011 699ebay.com
10.
 
Panasonic G2......72/1004/54.5/5 Mar 2010 599ebay.com
11.
 
Panasonic GF23/582/100..70/1004.5/54.5/5 Nov 2010 549ebay.com
12.
 
Panasonic GF1..85/100..69/1004.5/54.5/5 Sep 2009 749ebay.com
13.
 
Panasonic G1..+ +..70/1004/54.5/5 Sep 2008 599ebay.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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The review scores listed above should be treated with care, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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Check G100 price at
amazon.com
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Check K-3 III price at
amazon.com

Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just use the search menu below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Panasonic G100 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 G100 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 June 2020 March 2021
    Launch Price USD 649 USD 1,999
    Sensor Specs Panasonic G100 Pentax K-3 III
    Sensor Technology Live MOS 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 20.2 Megapixels 25.6 Megapixels
    Image Resolution 5184 x 3888 pixels 6192 x 4128 pixels
    Pixel Pitch 3.34 μm 3.76 μm
    Pixel Density 8.96 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
    Screen Specs Panasonic G100 Pentax K-3 III
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.73x 0.70x
    Viewfinder Resolution 3680k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 1840k dots 1620k dots
    LCD Attachment Swivel screen Fixed screen
    Touch Input Touchscreen Touchscreen
    Shooting Specs Panasonic G100 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 G100 Pentax K-3 III
    External Flash 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 External MIC port External MIC port
    Headphone Socket Headphone port Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Bluetooth Support Bluetooth built-in Bluetooth built-in
    Geotagging no internal GPS GPS built-in
    Body Specs Panasonic G100 Pentax K-3 III
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Panasonic DMW-BLG10 Pentax D-LI90
    Battery Life (CIPA)270 shots per charge800 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 116 x 83 x 54 mm
    (4.6 x 3.3 x 2.1 in)
    135 x 104 x 74 mm
    (5.3 x 4.1 x 2.9 in)
    Camera Weight 352 g (12.4 oz) 820 g (28.9 oz)
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