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Panasonic G6 vs Pentax 645D

The Panasonic Lumix DMC-G6 and the Pentax 645D are two digital cameras that were revealed to the public, respectively, in April 2013 and March 2010. The G6 is a mirrorless interchangeable lens camera, while the 645D is a DSLR. The cameras are based on a Four Thirds (G6) and a medium format (645D) sensor. The Panasonic has a resolution of 15.9 megapixels, whereas the Pentax provides 39.5 MP.

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

Headline Specifications
Panasonic G6
versus
Pentax 645D
Panasonic G6   Pentax 645D
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Pentax 645 mount lenses
15.9 MP – Four Thirds sensor 39.5 MP – Medium Format sensor
1080/60p Video no Video
ISO 160-12,800 (160 - 25,600) ISO 100-1,600
Electronic viewfinder (1440k dots) Optical viewfinder
3.0" LCD – 1036k dots 3.0" LCD – 921k dots
Swivel touchscreen Fixed screen (not touch-sensitive)
7 shutter flaps per second 1.1 shutter flaps per second
not weather sealedWeathersealed body
340 shots per battery charge800 shots per battery charge
122 x 85 x 71 mm, 390 g 156 x 117 x 119 mm, 1480 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Panasonic Lumix DMC-G6 and the Pentax 645D? 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

An illustration of the physical size and weight of the Panasonic G6 and the Pentax 645D is provided 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 G6 can be obtained in three different colors (black, silver, white), while the 645D is only available in black.

Size Panasonic G6 vs Pentax 645D
Compare G6 versus 645D top
Comparison G6 or 645D rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645D is considerably larger (76 percent) than the Panasonic G6. Moreover, the 645D is substantially heavier (279 percent) than the G6. It is noteworthy in this context that the 645D is splash and dust-proof, while the G6 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 G6 gets 340 shots out of its Panasonic DMW-BLC12 battery, while the 645D 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. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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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 G6 122 mm 85 mm 71 mm 390 g 340 n Apr 2013 599ebay.com
2.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995ebay.com
3.
 
Canon 1D X 158 mm 168 mm 83 mm 1551 g 1120 Y Oct 2011 6,799ebay.com
4.
 
Canon 1D Mark IV 156 mm 157 mm 80 mm 1230 g 1500 Y Oct 2009 4,999ebay.com
5.
 
Leica S Typ 006 160 mm 120 mm 80 mm 1260 g .. Y Sep 2012 21,950ebay.com
6.
 
Nikon D3S 160 mm 157 mm 88 mm 1240 g 4200 Y Oct 2009 5,199ebay.com
7.
 
Olympus E-PL7 115 mm 67 mm 38 mm 357 g 350 n Aug 2014 599ebay.com
8.
 
Olympus E-PL5 111 mm 64 mm 38 mm 325 g 360 n Sep 2012 599ebay.com
9.
 
Panasonic G7 125 mm 86 mm 77 mm 410 g 350 n May 2015 649ebay.com
10.
 
Panasonic GF6 111 mm 65 mm 38 mm 323 g 340 n Apr 2013 499ebay.com
11.
 
Panasonic GX7 123 mm 71 mm 55 mm 402 g 350 n Aug 2013 999ebay.com
12.
 
Panasonic G5 120 mm 83 mm 71 mm 396 g 320 n Jul 2012 599ebay.com
13.
 
Panasonic GF5 108 mm 67 mm 37 mm 267 g 360 n Apr 2012 499ebay.com
14.
 
Panasonic G3 115 mm 84 mm 47 mm 336 g 270 n May 2011 599ebay.com
15.
 
Panasonic G10 124 mm 84 mm 74 mm 388 g 380 n Mar 2010 499ebay.com
16.
 
Panasonic G2 124 mm 84 mm 74 mm 428 g 360 n Mar 2010 599ebay.com
17.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499ebay.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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The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The G6 was launched at a markedly lower price (by 94 percent) than the 645D, 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.

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. 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 more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Panasonic G6 features a Four Thirds sensor and the Pentax 645D a medium format sensor. The sensor area in the 645D is 545 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 0.79. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Panasonic G6 and Pentax 645D sensor measures

With 39.5MP, the 645D offers a higher resolution than the G6 (15.9MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 3.76μm for the G6) due to its larger sensor. However, the G6 is a much more recent model (by 3 years and 1 month) than the 645D, 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 the 645D has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Pentax 645D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645D for good quality output (200 dots per inch) amounts to 36.3 x 27.2 inches or 92.3 x 69.1 cm, for very good quality (250 dpi) 29.1 x 21.8 inches or 73.8 x 55.3 cm, and for excellent quality (300 dpi) 24.2 x 18.1 inches or 61.5 x 46.1 cm. The corresponding values for the Panasonic G6 are 23 x 17.3 inches or 58.5 x 43.9 cm for good quality, 18.4 x 13.8 inches or 46.8 x 35.1 cm for very good quality, and 15.4 x 11.5 inches or 39 x 29.3 cm for excellent quality prints.

The Panasonic Lumix DMC-G6 has a native sensitivity range from ISO 160 to ISO 12800, which can be extended to ISO 160-25600. The corresponding ISO settings for the Pentax 645D are ISO 100 to ISO 1600 (no boost).

In terms of underlying technology, the G6 is build around a CMOS sensor, while the 645D uses a CCD 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.

G6 versus 645D 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. Of the two cameras under consideration, the 645D offers substantially better image quality than the G6 (overall score 21 points higher). The advantage is based on 3.3 bits higher color depth, 1.1 EV in additional dynamic range, and 1 stops in additional low light sensitivity. 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 G6 Four Thirds 15.9 4608 34561080/60p21.311.563961
2.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
3.
 
Canon 1D X Full Frame 17.9 5184 34561080/30p23.811.8278682
4.
 
Canon 1D Mark IV APS-H 16.0 4896 32641080/30p22.812.0132074
5.
 
Leica S Typ 006 Medium Format 37.5 7500 5000none23.912.282476
6.
 
Nikon D3S Full Frame 12.1 4256 2832720/24p23.512.0325382
7.
 
Olympus E-PL7 Four Thirds 15.9 4608 34561080/30p22.712.487372
8.
 
Olympus E-PL5 Four Thirds 15.9 4608 34561080/30p22.812.388972
9.
 
Panasonic G7 Four Thirds 15.8 4592 34484K/30p22.812.490471
10.
 
Panasonic GF6 Four Thirds 15.8 4592 34481080/60i20.710.662254
11.
 
Panasonic GX7 Four Thirds 15.8 4592 34481080/60p22.612.271870
12.
 
Panasonic G5 Four Thirds 15.9 4608 34561080/60p21.411.661861
13.
 
Panasonic GF5 Four Thirds 12.0 4000 30001080/60i20.510.057350
14.
 
Panasonic G3 Four Thirds 15.8 4592 34481080/60i21.010.666756
15.
 
Panasonic G10 Four Thirds 12.0 4000 3000720/30p21.210.141152
16.
 
Panasonic G2 Four Thirds 12.0 4000 3000720/30p21.210.349353
17.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
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. The G6 indeed provides movie recording capabilities, while the 645D does not. The highest resolution format that the G6 can use is 1080/60p.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the G6 has an electronic viewfinder (1440k dots), while the 645D 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 viewfinder in the G6 offers a wider field of view (100%) than the one in the 645D (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the 645D has a higher magnification (0.78x vs 0.70x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Panasonic G6 and Pentax 645D 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 G61440 n3.0 / 1036 swivel Y 1/4000s 7.0/s Y n
2.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
3.
 
Canon 1D Xoptical Y3.2 / 1040 fixed n 1/8000s 14.0/s n n
4.
 
Canon 1D Mark IVoptical Y3.0 / 920 fixed n 1/8000s 10.0/s n n
5.
 
Leica S Typ 006optical Y3.0 / 922 fixed n 1/4000s 1.5/s n n
6.
 
Nikon D3Soptical Y3.0 / 921 fixed n 1/8000s 11.0/s n n
7.
 
Olympus E-PL7optional n3.0 / 1037 tilting Y 1/4000s 8.0/s n Y
8.
 
Olympus E-PL5optional n3.0 / 460 tilting Y 1/4000s 8.0/s n Y
9.
 
Panasonic G72360 n3.0 / 1040 swivel Y 1/4000s 7.0/s Y n
10.
 
Panasonic GF6none n3.0 / 1040 tilting Y 1/4000s 4.2/s Y n
11.
 
Panasonic GX72760 n3.0 / 1040 tilting Y 1/8000s 5.0/s Y Y
12.
 
Panasonic G51440 n3.0 / 920 swivel Y 1/4000s 6.0/s Y n
13.
 
Panasonic GF5none n3.0 / 920 fixed Y 1/4000s 4.0/s Y n
14.
 
Panasonic G31440 n3.0 / 460 swivel Y 1/4000s 4.0/s Y n
15.
 
Panasonic G10202 n3.0 / 460 fixed n 1/4000s 2.6/s Y n
16.
 
Panasonic G21440 n3.0 / 460 swivel Y 1/4000s 2.6/s Y n
17.
 
Pentax 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
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 G6 has one, while the 645D does not. While the built-in flash of the G6 is not very powerful, it can at times be useful as a fill-in light.

The G6 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 645D 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 G6 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 G6 and the Pentax 645D 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 G6 and the 645D write their files to SDXC cards. The 645D features dual card slots, which can be very useful in case a memory card fails. In contrast, the G6 only has one slot. The G6 supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the 645D cannot take advantage of Ultra High Speed SD 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-G6 and Pentax 645D 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 G6Ystereo / monoY-mini2.0YY-
2.
 
Pentax 645DYstereo / ----2.0---
3.
 
Canon 1D XYmono / -Y-mini2.0---
4.
 
Canon 1D Mark IVYstereo / -Y-mini2.0---
5.
 
Leica S Typ 006Y- / ---mini2.0---
6.
 
Nikon D3SYstereo / ---mini2.0---
7.
 
Olympus E-PL7Ystereo / mono--micro2.0Y--
8.
 
Olympus E-PL5Ystereo / mono--mini2.0---
9.
 
Panasonic G7Ystereo / monoY-micro2.0Y--
10.
 
Panasonic GF6-stereo / mono--mini2.0YY-
11.
 
Panasonic GX7Ystereo / mono--mini2.0YY-
12.
 
Panasonic G5Ystereo / mono--mini2.0---
13.
 
Panasonic GF5-stereo / mono--mini2.0---
14.
 
Panasonic G3Ystereo / mono--mini2.0---
15.
 
Panasonic G10Ymono / ---mini2.0---
16.
 
Panasonic G2Ystereo / mono--mini2.0---
17.
 
Pentax 645ZYstereo / monoY-mini3.0---
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It is notable that the G6 offers wifi support, while the 645D does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Studio photographers will appreciate that the Pentax 645D (unlike the G6) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the G6 and the 645D have been discontinued, but can regularly be found used on ebay. The 645D was replaced by the Pentax 645Z, while the G6 was followed by the Panasonic G7. Further information on the features and operation of the G6 and 645D can be found, respectively, in the Panasonic G6 Manual (free pdf) or the online Pentax 645D Manual.

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Review summary

So what is the bottom line? Is the Panasonic G6 better than the Pentax 645D or vice versa? A synthesis of the relative strong points of each of the models is listed below.

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Arguments in favor of the Panasonic Lumix DMC-G6:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Broader imaging potential: Can record not only still images but also 1080/60p movies.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More complete view: Has a viewfinder with a larger field of view (100% vs 98%).
  • More detailed LCD: Has a higher resolution rear screen (1036k vs 921k dots).
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (7 vs 1.1 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (122x85mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 1090g or 74 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.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
  • More affordable: Was introduced into a lower priced category (94 percent cheaper at launch).
  • More modern: Reflects 3 years and 1 month of technical progress since the 645D launch.

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Advantages of the Pentax 645D:

  • More detail: Has more megapixels (39.5 vs 15.9MP), which boosts linear resolution by 58%.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores substantially higher (21 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (3.3 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (1.1 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1 stops ISO advantage).
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.70x).
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • Longer lasting: Gets more shots (800 versus 340) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • 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.
  • More heavily discounted: Has been around for much longer (launched in March 2010).

If the count of individual advantages (bullet points above) is taken as a guide, the G6 is the clear winner of the match-up (19 : 14 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 wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

G6 19:14 645D

How about other alternatives? Do the specifications of the Panasonic G6 and the Pentax 645D 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 incomplete and does no justice, for example, to the way the G6 or the 645D perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why hands-on reviews by experts are important. The following table reports the overall ratings 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]). 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 G64/5+ +....5/54.5/5 Apr 2013 599ebay.com
2.
 
Pentax 645D5/5.......... Mar 2010 9,995ebay.com
3.
 
Canon 1D X5/5......4.5/54.5/5 Oct 2011 6,799ebay.com
4.
 
Canon 1D Mark IV5/5....89/100.... Oct 2009 4,999ebay.com
5.
 
Leica S Typ 006............ Sep 2012 21,950ebay.com
6.
 
Nikon D3S5/5....89/1004.5/55/5 Oct 2009 5,199ebay.com
7.
 
Olympus E-PL74/5+....5/54/5 Aug 2014 599ebay.com
8.
 
Olympus E-PL53/5+ +....4.5/54.5/5 Sep 2012 599ebay.com
9.
 
Panasonic G74/5+ +3.5/580/1005/54.5/5 May 2015 649ebay.com
10.
 
Panasonic GF6..+ +....4.5/54.5/5 Apr 2013 499ebay.com
11.
 
Panasonic GX74/5+..79/1005/55/5 Aug 2013 999ebay.com
12.
 
Panasonic G53/5+ +....4.5/54.5/5 Jul 2012 599ebay.com
13.
 
Panasonic GF53/5......4.5/54.5/5 Apr 2012 499ebay.com
14.
 
Panasonic G33/5+ +..75/1004.5/55/5 May 2011 599ebay.com
15.
 
Panasonic G103/5....70/1004/54/5 Mar 2010 499ebay.com
16.
 
Panasonic G2......72/1004/54.5/5 Mar 2010 599ebay.com
17.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 8,499ebay.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 were established in reference to similarly priced cameras that were available in the market at the time of the review. 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Panasonic G6 vs Pentax 645D

    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 G6 Pentax 645D
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Pentax 645 mount lenses
    Launch Date April 2013 March 2010
    Launch Price USD 599 USD 9,995
    Sensor Specs Panasonic G6 Pentax 645D
    Sensor Technology CMOS CCD
    Sensor Format Four Thirds Sensor Medium Format Sensor
    Sensor Size 17.3 x 13.0 mm 44.0 x 33.0 mm
    Sensor Area 224.9 mm2 1452 mm2
    Sensor Diagonal 21.6 mm 55 mm
    Crop Factor 2.0x 0.79x
    Sensor Resolution 15.9 Megapixels 39.5 Megapixels
    Image Resolution 4608 x 3456 pixels 7264 x 5440 pixels
    Pixel Pitch 3.76 μm 6.06 μm
    Pixel Density 7.08 MP/cm2 2.72 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability 1080/60p Video no Video
    ISO Setting 160 - 12,800 ISO 100 - 1,600 ISO
    ISO Boost 160 - 25,600 ISO no Enhancement
    Image Processor Venus PRIME II
    DXO Sensor Quality (score) 61 82
    DXO Color Depth (bits) 21.3 24.6
    DXO Dynamic Range (EV) 11.5 12.6
    DXO Low Light (ISO) 639 1262
    Screen Specs Panasonic G6 Pentax 645D
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 98%
    Viewfinder Magnification 0.70x 0.78x
    Viewfinder Resolution 1440k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1036k dots 921k dots
    LCD Attachment Swivel screen Fixed screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Panasonic G6 Pentax 645D
    Focus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidFocus Peakingno Peaking Feature
    Continuous Shooting 7 shutter flaps/s 1.1 shutter flaps/s
    Electronic Shutterup to 1/4000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    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 no
    Connectivity Specs Panasonic G6 Pentax 645D
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI no HDMI
    Microphone Port External MIC port no MIC socket
    Wifi Support Wifi built-in no Wifi
    Near-Field Communication NFC built-in no NFC
    Body Specs Panasonic G6 Pentax 645D
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Panasonic DMW-BLC12 Pentax D-LI90
    Battery Life (CIPA)340 shots per charge800 shots per charge
    Body Dimensions 122 x 85 x 71 mm
    (4.8 x 3.3 x 2.8 in)
    156 x 117 x 119 mm
    (6.1 x 4.6 x 4.7 in)
    Camera Weight 390 g (13.8 oz) 1480 g (52.2 oz)
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