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Panasonic GX1 vs Pentax 645Z

The Panasonic Lumix DMC-GX1 and the Pentax 645Z are two digital cameras that were announced, respectively, in November 2011 and April 2014. The GX1 is a mirrorless interchangeable lens camera, while the 645Z is a DSLR. The cameras are based on a Four Thirds (GX1) and a medium format (645Z) sensor. The Panasonic has a resolution of 15.8 megapixels, whereas the Pentax provides 51.1 MP.

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

Headline Specifications
Panasonic GX1   VS Pentax 645Z
Panasonic GX1 Pentax 645Z
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Pentax 645 mount lenses
15.8 MP, Four Thirds Sensor 51.1 MP, Medium Format Sensor
1080/60p Video 1080/60i Video
ISO 160-12800 ISO 100-204800
Viewfinder optional Optical viewfinder
3.0" LCD, 460k dots 3.2" LCD, 1037k dots
Fixed touchscreen Tilting screen (not touch-sensitive)
4.2 shutter flaps per second 3 shutter flaps per second
Not weather sealedWeathersealed body
320 shots per battery charge650 shots per battery charge
116 x 68 x 39 mm, 318 g 156 x 117 x 123 mm, 1550 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Panasonic Lumix DMC-GX1 and the Pentax 645Z? 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.

Body comparison

The physical size and weight of the Panasonic GX1 and the Pentax 645Z 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.

Size Panasonic GX1 vs Pentax 645Z
Compare GX1 versus 645Z top
Comparison GX1 or 645Z rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645Z is considerably larger (131 percent) than the Panasonic GX1. Moreover, the 645Z is substantially heavier (387 percent) than the GX1. It is noteworthy in this context that the 645Z is splash and dust-proof, while the GX1 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 GX1 gets 320 shots out of its DMW-BLD10 battery, while the 645Z can take 650 images on a single charge of its 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, just click on the right or left arrow next to the camera that you would like to inspect. Alternatively, you can also use the CAM-parator to select your camera combination among a larger number of options.

Camera Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Camera
Model
 
Panasonic GX1» 116 mm 68 mm 39 mm 318 g 320 n Nov 2011 699iPanasonic GX1
 
Pentax 645Z« 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 8,499 iPentax 645Z
 
Canon 5DS« » 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699 iCanon 5DS
 
Canon 5DS R« » 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699 iCanon 5DS R
 
Hasselblad X1D« » 150 mm 98 mm 71 mm 725 g .. Y Jun 2016 8,995iHasselblad X1D
 
Leica SL« » 147 mm 104 mm 39 mm 847 g 400 Y Oct 2015 7,450iLeica SL
 
Nikon 1 V2« » 109 mm 82 mm 46 mm 278 g 310 n Oct 2012 799iNikon 1 V2
 
Panasonic GM5« » 99 mm 60 mm 36 mm 211 g 220 n Sep 2014 749iPanasonic GM5
 
Panasonic GF6« » 111 mm 65 mm 38 mm 323 g 340 n Apr 2013 499iPanasonic GF6
 
Panasonic GX7« » 123 mm 71 mm 55 mm 402 g 350 n Aug 2013 999iPanasonic GX7
 
Panasonic GF5« » 108 mm 67 mm 37 mm 267 g 360 n Apr 2012 499iPanasonic GF5
 
Panasonic G3« » 115 mm 84 mm 47 mm 336 g 270 n May 2011 599iPanasonic G3
 
Panasonic GF3« » 108 mm 67 mm 32 mm 264 g 300 n Jun 2011 549iPanasonic GF3
 
Panasonic G10« » 124 mm 84 mm 74 mm 388 g 380 n Mar 2010 499iPanasonic G10
 
Panasonic GF2« » 113 mm 68 mm 33 mm 310 g 300 n Nov 2010 549iPanasonic GF2
 
Panasonic GH2« » 124 mm 90 mm 76 mm 442 g 330 n Sep 2010 899iPanasonic GH2
 
Pentax 645D« » 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 9,995iPentax 645D
Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The GX1 was launched at a markedly lower price (by 92 percent) than the 645Z, 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. 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Panasonic GX1 features a Four Thirds sensor and the Pentax 645Z a medium format sensor. The sensor area in the 645Z is 539 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.

In terms of underlying technology, both cameras are build around CMOS sensors.

Panasonic GX1 and Pentax 645Z sensor measures

With 51.1MP, the 645Z offers a higher resolution than the GX1 (15.8MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 3.77μm for the GX1) due to its larger sensor. Moreover, the 645Z is a much more recent model (by 2 years and 5 months) than the GX1, and its sensor will 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 the 645Z has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Pentax 645Z implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645Z for good quality output (200 dots per inch) amounts to 41.3 x 31 inch or 104.9 x 78.6 cm, for very good quality (250 dpi) 33 x 24.8 inch or 83.9 x 62.9 cm, and for excellent quality (300 dpi) 27.5 x 20.6 inch or 69.9 x 52.4 cm. The corresponding values for the Panasonic GX1 are 23 x 17.2 inch or 58.3 x 43.8 cm for good quality, 18.4 x 13.8 inch or 46.7 x 35 cm for very good quality, and 15.3 x 11.5 inch or 38.9 x 29.2 cm for excellent quality prints.

The Panasonic Lumix DMC-GX1 has a native sensitivity range from ISO 160 to ISO 12800. The corresponding ISO settings for the Pentax 645Z are ISO 100 to ISO 204800 (no boost).

GX1 versus 645Z 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 645Z offers substantially better image quality than the GX1 (overall score 46 points higher). The advantage is based on 5.2 bits higher color depth, 4.1 EV in additional dynamic range, and 2.7 stops in additional low light sensitivity. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
 
Panasonic GX1 Four Thirds 15.8 4592 34481080/60p20.810.670355Panasonic GX1
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101Pentax 645Z
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.4238187Canon 5DS
 
Canon 5DS R Full Frame 50.3 8688 57921080/30p24.612.4230886Canon 5DS R
 
Hasselblad X1D Medium Format 51.3 8272 62001080/25p26.214.84489102Hasselblad X1D
 
Leica SL Full Frame 24.0 6000 40004K/30p25.013.4182188Leica SL
 
Nikon 1 V2 1-inch 14.2 4608 30721080/60p20.210.840350Nikon 1 V2
 
Panasonic GM5 Four Thirds 15.8 4592 34481080/60p22.111.772166Panasonic GM5
 
Panasonic GF6 Four Thirds 15.8 4592 34481080/60i20.710.662254Panasonic GF6
 
Panasonic GX7 Four Thirds 15.8 4592 34481080/60p22.612.271870Panasonic GX7
 
Panasonic GF5 Four Thirds 12.0 4000 30001080/60i21.411.661861Panasonic GF5
 
Panasonic G3 Four Thirds 15.8 4592 34481080/60i21.010.666756Panasonic G3
 
Panasonic GF3 Four Thirds 12.0 4000 30001080/60i20.610.045849Panasonic GF3
 
Panasonic G10 Four Thirds 12.0 4000 3000720/30p21.210.141152Panasonic G10
 
Panasonic GF2 Four Thirds 12.0 4000 30001080/60i21.210.350654Panasonic GF2
 
Panasonic GH2 Four Thirds 15.9 4608 34561080/60i21.211.365560Panasonic GH2
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282Pentax 645D

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the GX1 provides a higher frame rate than the 645Z. It can shoot video footage at 1080/60p, while the Pentax is limited to 1080/60i.

 

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the 645Z has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the GX1 relies on live view and the rear LCD for framing. That said, the GX1 can be equipped with an optional viewfinder – the DMW-LVF2. The table below summarizes some of the other core capabilities of the Panasonic GX1 and Pentax 645Z in connection with corresponding information for a sample of similar cameras.

Core Features
  Camera
Model
Viewfinder
(Type or
'000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
('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
Camera
Model
 
Panasonic GX1optional n 3.0 460 fixed Y 1/4000s 4.2 Y n Panasonic GX1
 
Pentax 645Zoptical Y 3.2 1037 tilting n 1/4000s 3.0 n n Pentax 645Z
 
Canon 5DSoptical Y 3.2 1040 fixed n 1/8000s 5.0 n n Canon 5DS
 
Canon 5DS Roptical Y 3.2 1040 fixed n 1/8000s 5.0 n n Canon 5DS R
 
Hasselblad X1D2360 n 3.0 920 fixed Y 1/2000s 2.3 n n Hasselblad X1D
 
Leica SL4400 Y 3.0 1040 fixed Y 1/8000s 11.0 n n Leica SL
 
Nikon 1 V21440 n 3.0 921 fixed n 1/4000s 15.0 Y n Nikon 1 V2
 
Panasonic GM51166 n 3.0 921 fixed Y 1/500s 5.8 n n Panasonic GM5
 
Panasonic GF6none n 3.0 1040 tilting Y 1/4000s 4.2 Y n Panasonic GF6
 
Panasonic GX72760 n 3.0 1040 tilting Y 1/8000s 5.0 Y Y Panasonic GX7
 
Panasonic GF5none n 3.0 920 fixed Y 1/4000s 4.0 Y n Panasonic GF5
 
Panasonic G31440 n 3.0 460 swivel Y 1/4000s 4.0 Y n Panasonic G3
 
Panasonic GF3none n 3.0 460 fixed Y 1/4000s 3.2 Y n Panasonic GF3
 
Panasonic G10202 n 3.0 460 fixed n 1/4000s 2.6 Y n Panasonic G10
 
Panasonic GF2optional n 3.0 460 fixed Y 1/4000s 2.6 Y n Panasonic GF2
 
Panasonic GH21534 n 3.0 460 swivel n 1/4000s 3.0 Y n Panasonic GH2
 
Pentax 645Doptical Y 3.0 921 fixed n 1/4000s 1.1 n n Pentax 645D

One difference between the cameras concerns the presence of an on-board flash. The GX1 has one, while the 645Z does not. While the built-in flash of the GX1 is not very powerful, it can at times be useful as a fill-in light.

The Pentax 645Z has 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 GX1 and the 645Z write their files to SDXC cards. The 645Z features dual card slots, which can be very useful in case a memory card fails. In contrast, the GX1 only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

 

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-GX1 and Pentax 645Z and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
Camera
Model
 
Panasonic GX1Ystereomono--mini2.0---Panasonic GX1
 
Pentax 645ZYstereomonoY-mini3.0---Pentax 645Z
 
Canon 5DSYmonomonoY-mini3.0---Canon 5DS
 
Canon 5DS RYmonomonoY-mini3.0---Canon 5DS R
 
Hasselblad X1DYstereomonoYYmini3.0Y--Hasselblad X1D
 
Leica SLYstereomonoYYfull3.0Y--Leica SL
 
Nikon 1 V2-stereomono--mini2.0---Nikon 1 V2
 
Panasonic GM5Ystereomono--micro2.0Y--Panasonic GM5
 
Panasonic GF6-stereomono--mini2.0YY-Panasonic GF6
 
Panasonic GX7Ystereomono--mini2.0YY-Panasonic GX7
 
Panasonic GF5-stereomono--mini2.0---Panasonic GF5
 
Panasonic G3Ystereomono--mini2.0---Panasonic G3
 
Panasonic GF3-stereomono--mini2.0---Panasonic GF3
 
Panasonic G10Ymononone--mini2.0---Panasonic G10
 
Panasonic GF2Ystereomono--mini2.0---Panasonic GF2
 
Panasonic GH2YstereomonoY-mini2.0---Panasonic GH2
 
Pentax 645DYstereonone--none2.0---Pentax 645D

It is notable that the 645Z has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The GX1 does not feature such a mic input.

Studio photographers will appreciate that the Pentax 645Z (unlike the GX1) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The 645Z is a recent model that features in the current product line-up of Pentax. In contrast, the GX1 has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the GX1 was succeeded by the Panasonic GX7. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Panasonic and Pentax websites.

Review summary

So what is the bottom line? Which of the two cameras – the Panasonic GX1 or the Pentax 645Z – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

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Advantages of the Panasonic Lumix DMC-GX1:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • Faster burst: Shoots at higher frequency (4.2 vs 3 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (116x68mm vs 156x117mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 1232g or 79 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 (92 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in November 2011).

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Reasons to prefer the Pentax 645Z:

  • More detail: Has more megapixels (51.1 vs 15.8MP), which boosts linear resolution by 80%.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores substantially higher (46 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (5.2 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (4.1 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (2.7 stops ISO advantage).
  • Better sound: Can connect to an external microphone for higher quality sound 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 (1037k vs 460k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Gets more shots (650 versus 320) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Faster data transfer: Supports a more advanced USB protocol (3.0 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.
  • More modern: Reflects 2 years and 5 months of technical progress since the GX1 launch.

If the count of individual advantages (bullet points above) is taken as a guide, the 645Z is the clear winner of the contest (19 : 10 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

GX1 10:19 645Z

How about other alternatives? Do the specifications of the Panasonic GX1 and the Pentax 645Z 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 technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the GX1 or the 645Z. 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 expert reviews are important. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). 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.

Review Scores
  Camera
Model
cam
era
  labs  
dp
re
  view  
e
photo
  zine  
ima
ging
resource
photo
graphy
  blog  
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Camera
Model
 
Panasonic GX1+77/1004.5/54.5/54.5/5 Nov 2011 699iPanasonic GX1
 
Pentax 645Z....4.5/55/55/5 Apr 2014 8,499 iPentax 645Z
 
Canon 5DS+83/1004.5/55/54.5/5 Feb 2015 3,699 iCanon 5DS
 
Canon 5DS R+83/1005/55/54.5/5 Feb 2015 3,699 iCanon 5DS R
 
Hasselblad X1Do81/100....4/5 Jun 2016 8,995iHasselblad X1D
 
Leica SL..84/1004.5/54/54/5 Oct 2015 7,450iLeica SL
 
Nikon 1 V2....4.5/5..4/5 Oct 2012 799iNikon 1 V2
 
Panasonic GM5+77/1005/55/54.5/5 Sep 2014 749iPanasonic GM5
 
Panasonic GF6+ +..4.5/5..4.5/5 Apr 2013 499iPanasonic GF6
 
Panasonic GX7+79/1005/54.5/55/5 Aug 2013 999iPanasonic GX7
 
Panasonic GF5....4.5/54/54.5/5 Apr 2012 499iPanasonic GF5
 
Panasonic G3+ +75/1004.5/54.5/55/5 May 2011 599iPanasonic G3
 
Panasonic GF382/10071/1004.5/54.5/54/5 Jun 2011 549iPanasonic GF3
 
Panasonic G10..70/1004/5..4/5 Mar 2010 499iPanasonic G10
 
Panasonic GF282/10070/1004.5/54.5/54.5/5 Nov 2010 549iPanasonic GF2
 
Panasonic GH2+ +79/1004.5/54.5/55/5 Sep 2010 899iPanasonic GH2
 
Pentax 645D......4.5/5.. Mar 2010 9,995iPentax 645D
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, 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 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.

Panasonic GX1:
Check Ebay offers
Pentax 645Z:
Check Amazon price

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 a corresponding selection in the search boxes 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 GX1 vs Pentax 645Z

    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 GX1 Pentax 645Z
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Pentax 645 mount lenses
    Launch Date November 2011 April 2014
    Launch Price USD 699 USD 8499
    Sensor Specs Panasonic GX1 Pentax 645Z
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor Medium Format Sensor
    Sensor Size 17.3 x 13.0 mm 43.8 x 32.8 mm
    Sensor Area 224.9 mm2 1436.64 mm2
    Sensor Diagonal 21.6 mm 54.7 mm
    Crop Factor 2.0x 0.79x
    Sensor Resolution 15.8 Megapixels 51.1 Megapixels
    Image Resolution 4592 x 3448 pixels 8256 x 6192 pixels
    Pixel Pitch 3.77 μm 5.30 μm
    Pixel Density 7.04 MP/cm2 3.56 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability 1080/60p Video 1080/60i Video
    ISO Setting 160-12800 ISO 100-204800 ISO
    Image Processor Venus FHD PRIME III
    DXO Sensor Quality (score) 55 101
    DXO Color Depth (bits) 20.8 26.0
    DXO Dynamic Range (EV) 10.6 14.7
    DXO Low Light (ISO) 703 4505
    Screen Specs Panasonic GX1 Pentax 645Z
    Viewfinder Type Viewfinder optional Optical viewfinder
    Viewfinder Field of View 98%
    Viewfinder Magnification 0.78x
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0 inch 3.2 inch
    LCD Resolution 460k dots 1037k dots
    LCD Attachment Fixed screen Tilting screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Panasonic GX1 Pentax 645Z
    Autofocus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000/s 1/4000/s
    Continuous Shooting 4.2 shutter flaps/s 3 shutter flaps/s
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Fill Flash Build-in Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Second Storage Option Single card slot Dual card slots
    UHS card support UHS-I UHS-I
    Connectivity Specs Panasonic GX1 Pentax 645Z
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 3.0
    HDMI Port mini HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi no Wifi
    Body Specs Panasonic GX1 Pentax 645Z
    Environmental SealingNot weather sealedWeathersealed body
    Battery Type DMW-BLD10 D-LI90
    Battery Life (CIPA)320 shots per charge650 shots per charge
    Body Dimensions 116 x 68 x 39 mm
    (4.6 x 2.7 x 1.5 in)
    156 x 117 x 123 mm
    (6.1 x 4.6 x 4.8 in)
    Camera Weight 318 g (11.2 oz) 1550 g (54.7 oz)

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