Panasonic G1 vs Pentax 645D
The Panasonic Lumix DMC-G1 and the Pentax 645D are two digital cameras that were revealed to the public, respectively, in September 2008 and March 2010. The G1 is a mirrorless interchangeable lens camera, while the 645D is a DSLR. The cameras are based on a Four Thirds (G1) and a medium format (645D) sensor. The Panasonic has a resolution of 12 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.
Going beyond this snapshot of core features and characteristics, what are the differences between the Panasonic Lumix DMC-G1 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.
An illustration of the physical size and weight of the Panasonic G1 and the Pentax 645D is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter.
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 (75 percent) than the Panasonic G1. Moreover, the 645D is substantially heavier (311 percent) than the G1. It is noteworthy in this context that the 645D is splash and dust-proof, while the G1 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.
The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you would like to visualize and compare a different camera combination, just use the right or left arrows in the table to switch to the respective camera. Alternatively, you can also navigate to the CAM-parator app and make your selection from the full list of cameras there.
|Panasonic G1||4.9 in||3.3 in||1.8 in||12.7 oz||410||n||Sep 2008||599|
|Pentax 645D||6.1 in||4.6 in||4.7 in||52.2 oz||800||Y||Mar 2010||9,995|
|Canon 1D X||6.2 in||6.6 in||3.3 in||54.7 oz||1120||Y||Oct 2011||6,799|
|Canon 1D Mark IV||6.1 in||6.2 in||3.1 in||43.4 oz||1500||Y||Oct 2009||4,999|
|Leica S Typ 006||6.3 in||4.7 in||3.1 in||44.4 oz||..||Y||Sep 2012||21,950|
|Nikon D3S||6.3 in||6.2 in||3.5 in||43.7 oz||4200||Y||Oct 2009||5,199|
|Olympus E-410||5.1 in||3.6 in||2.1 in||15.3 oz||500||n||Mar 2007||699|
|Panasonic GF6||4.4 in||2.6 in||1.5 in||11.4 oz||340||n||Apr 2013||499|
|Panasonic GF5||4.3 in||2.6 in||1.5 in||9.4 oz||360||n||Apr 2012||499|
|Panasonic GF3||4.3 in||2.6 in||1.3 in||9.3 oz||300||n||Jun 2011||549|
|Panasonic G10||4.9 in||3.3 in||2.9 in||13.7 oz||380||n||Mar 2010||499|
|Panasonic G2||4.9 in||3.3 in||2.9 in||15.1 oz||360||n||Mar 2010||599|
|Panasonic GF2||4.4 in||2.7 in||1.3 in||10.9 oz||300||n||Nov 2010||549|
|Panasonic GF1||4.7 in||2.8 in||1.4 in||13.6 oz||380||n||Sep 2009||749|
|Panasonic GH1||4.9 in||3.5 in||1.8 in||13.6 oz||300||n||Mar 2009||899|
|Panasonic L10||5.3 in||3.8 in||3.1 in||19.6 oz||450||n||Aug 2007||599|
|Pentax 645Z||6.1 in||4.6 in||4.8 in||54.7 oz||650||Y||Apr 2014||8,499|
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
(1) Number of images that can be taken on a full battery charge according to the CIPA-standard; (2) Official announcement.
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 G1 was launched at a markedly lower price (by 94 percent) than the 645D, 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.
The size of the imaging sensor is a crucial determinant of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Panasonic G1 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.
With 39.5MP, the 645D offers a higher resolution than the G1 (12MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 4.33μm for the G1) due to its larger sensor. Moreover, the 645D is a somewhat more recent model (by 1 year and 5 months) than the G1, 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 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 G1 are 20 x 15 inches or 50.8 x 38.1 cm for good quality, 16 x 12 inches or 40.6 x 30.5 cm for very good quality, and 13.3 x 10 inches or 33.9 x 25.4 cm for excellent quality prints.
The Panasonic Lumix DMC-G1 has a native sensitivity range from ISO 100 to ISO 1600, which can be extended to ISO 100-3200. The corresponding ISO settings for the Pentax 645D are ISO 100 to ISO 1600 (no boost).
Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). Of the two cameras under consideration, the 645D offers substantially better image quality than the G1 (overall score 29 points higher). The advantage is based on 3.5 bits higher color depth, 2.3 EV in additional dynamic range, and 1.4 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Panasonic G1||Four Thirds||12.0||4000||3000||none||21.1||10.3||463||53|
|Pentax 645D||Medium Format||39.5||7264||5440||none||24.6||12.6||1262||82|
|Canon 1D X||Full Frame||17.9||5184||3456||1080/30p||23.8||11.8||2786||82|
|Canon 1D Mark IV||APS-H||16.0||4896||3264||1080/30p||22.8||12.0||1320||74|
|Leica S Typ 006||Medium Format||37.5||7500||5000||none||23.9||12.2||824||76|
|Nikon D3S||Full Frame||12.1||4256||2832||720/24p||23.5||12.0||3253||82|
|Olympus E-410||Four Thirds||10.0||3648||2736||none||21.1||10.0||494||51|
|Panasonic GF6||Four Thirds||15.8||4592||3448||1080/60i||20.7||10.6||622||54|
|Panasonic GF5||Four Thirds||12.0||4000||3000||1080/60i||21.4||11.6||618||61|
|Panasonic GF3||Four Thirds||12.0||4000||3000||1080/60i||20.6||10.0||458||49|
|Panasonic G10||Four Thirds||12.0||4000||3000||720/30p||21.2||10.1||411||52|
|Panasonic G2||Four Thirds||12.0||4000||3000||720/30p||21.2||10.3||493||53|
|Panasonic GF2||Four Thirds||12.0||4000||3000||1080/60i||21.2||10.3||506||54|
|Panasonic GF1||Four Thirds||12.0||4000||3000||720/30p||21.2||10.3||513||54|
|Panasonic GH1||Four Thirds||12.0||4000||3000||1080/24p||21.6||11.6||772||64|
|Panasonic L10||Four Thirds||10.0||3648||2736||none||21.3||10.8||429||55|
|Pentax 645Z||Medium Format||51.1||8256||6192||1080/60i||26.0||14.7||4505||101|
Beyond body and sensor, cameras can and do differ across a range of features. For example, the G1 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 G1 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 G1 and Pentax 645D along with similar information for a selection of comparators.
|Canon 1D X||optical||Y||3.2||1040||fixed||n||1/8000s||14.0||n||n|
|Canon 1D Mark IV||optical||Y||3.0||920||fixed||n||1/8000s||10.0||n||n|
|Leica S Typ 006||optical||Y||3.0||922||fixed||n||1/4000s||1.5||n||n|
One difference between the cameras concerns the presence of an on-board flash. The G1 has one, while the 645D does not. While the built-in flash of the G1 is not very powerful, it can at times be useful as a fill-in light.The G1 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 Pentax 645D 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.
The G1 writes its imaging data to SDHC cards, while the 645D uses SDXC cards. The 645D features dual card slots, which can be very useful in case a memory card fails. In contrast, the G1 only has one slot.
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-G1 and Pentax 645D and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
|Canon 1D X||Y||mono||-||Y||-||mini||2.0||-||-||-|
|Canon 1D Mark IV||Y||stereo||-||Y||-||mini||2.0||-||-||-|
|Leica S Typ 006||Y||-||-||-||-||mini||2.0||-||-||-|
Studio photographers will appreciate that the Pentax 645D (unlike the G1) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the G1 and the 645D have been discontinued, but can regularly be found used on eBay. The G1 was replaced by the Panasonic G2, while the 645D was followed by the Pentax 645Z. 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.
So how do things add up? Is there a clear favorite between the Panasonic G1 and the Pentax 645D? Which camera is better? The listing below highlights the relative strengths of the two models.
Arguments in favor of the Panasonic Lumix DMC-G1:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- 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 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.
- Faster burst: Shoots at higher frequency (3 vs 1.1 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (124x84mm vs 156x117mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 1120g or 76 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 (94 percent cheaper at launch).
- More heavily discounted: Has been on the market for longer (launched in September 2008).
Advantages of the Pentax 645D:
- More detail: Has more megapixels (39.5 vs 12MP), which boosts linear resolution by 82%.
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- Better image quality: Scores substantially higher (29 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (3.5 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (2.3 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (1.4 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.
- More detailed LCD: Has a higher resolution rear screen (921k vs 460k dots).
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Longer lasting: Gets more shots (800 versus 410) 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 modern: Was introduced somewhat (1 year and 5 months) more recently.
If the number of relative strengths (bullet points above) is taken as a guide, the 645D is the clear winner of the contest (16 : 12 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 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.
How about other alternatives? Do the specifications of the Panasonic G1 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 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 G1 or the 645D. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.
This is why hands-on reviews by experts are important. The adjacent summary-table relays the overall verdicts of several of the most popular 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.
|Panasonic G1||+ +||70/100||4/5||4.5/5||4.5/5||Sep 2008||599|
|Pentax 645D||..||..||..||4.5/5||..||Mar 2010||9,995|
|Canon 1D X||..||..||4.5/5||4.5/5||4.5/5||Oct 2011||6,799|
|Canon 1D Mark IV||..||89/100||..||5/5||..||Oct 2009||4,999|
|Leica S Typ 006||..||..||..||..||..||Sep 2012||21,950|
|Nikon D3S||..||89/100||4.5/5||5/5||5/5||Oct 2009||5,199|
|Olympus E-410||86/100||+ +||4/5||o||4.5/5||Mar 2007||699|
|Panasonic GF6||+ +||..||4.5/5||..||4.5/5||Apr 2013||499|
|Panasonic GF5||..||..||4.5/5||4/5||4.5/5||Apr 2012||499|
|Panasonic GF3||82/100||71/100||4.5/5||4.5/5||4/5||Jun 2011||549|
|Panasonic G10||..||70/100||4/5||..||4/5||Mar 2010||499|
|Panasonic G2||..||72/100||4/5||4/5||4.5/5||Mar 2010||599|
|Panasonic GF2||82/100||70/100||4.5/5||4.5/5||4.5/5||Nov 2010||549|
|Panasonic GF1||85/100||69/100||4.5/5||4.5/5||4.5/5||Sep 2009||749|
|Panasonic GH1||+ +||72/100||4.5/5||5/5||4.5/5||Mar 2009||899|
|Panasonic L10||85/100||+||3.5/5||o||4/5||Aug 2007||599|
|Pentax 645Z||..||..||4.5/5||5/5||5/5||Apr 2014||8,499|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The review scores listed above should be treated 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, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.
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.
- Canon 1300D vs Pentax 645D
- Canon 350D vs Pentax 645D
- Canon 550D vs Pentax 645D
- Canon G5 X Mark II vs Panasonic G1
- Canon G7 X Mark II vs Panasonic G1
- Canon R vs Pentax 645D
- Canon T5 vs Panasonic G1
- Fujifilm X-A3 vs Panasonic G1
- Leica M10 vs Panasonic G1
- Leica M10-P vs Panasonic G1
- Nikon D300S vs Pentax 645D
- Olympus E-M1X vs Pentax 645D
Specifications: Panasonic G1 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 Model||Panasonic G1||Pentax 645D|
|Camera Type||Mirrorless system camera||Digital single lens reflex|
|Camera Lens||Micro Four Thirds lenses||Pentax 645 mount lenses|
|Launch Date||September 2008||March 2010|
|Launch Price||USD 599||USD 9,995|
|Sensor Specs||Panasonic G1||Pentax 645D|
|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|
|Sensor Resolution||12 Megapixels||39.5 Megapixels|
|Image Resolution||4000 x 3000 pixels||7264 x 5440 pixels|
|Pixel Pitch||4.33 μm||6.06 μm|
|Pixel Density||5.34 MP/cm2||2.72 MP/cm2|
|Moiré control||Anti-Alias filter||no AA filter|
|Movie Capability||no Video||no Video|
|ISO Setting||100 - 1,600 ISO||100 - 1,600 ISO|
|ISO Boost||100 - 3,200 ISO||no Enhancement|
|Image Processor||Venus HD||PRIME II|
|DXO Sensor Quality (score)||53||82|
|DXO Color Depth (bits)||21.1||24.6|
|DXO Dynamic Range (EV)||10.3||12.6|
|DXO Low Light (ISO)||463||1262|
|Screen Specs||Panasonic G1||Pentax 645D|
|Viewfinder Type||Electronic viewfinder||Optical viewfinder|
|Viewfinder Field of View||100%||98%|
|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||460k dots||921k dots|
|LCD Attachment||Swivel screen||Fixed screen|
|Shooting Specs||Panasonic G1||Pentax 645D|
|Focus System||Contrast-detect AF||Phase-detect AF|
|Continuous Shooting||3 shutter flaps/s||1.1 shutter flaps/s|
|Time-Lapse Photography||no Intervalometer||Intervalometer built-in|
|Fill Flash||Build-in Flash||no On-Board Flash|
|Storage Medium||SDHC cards||SDXC cards|
|Second Storage Option||Single card slot||Dual card slots|
|UHS card support||no||no|
|Connectivity Specs||Panasonic G1||Pentax 645D|
|Studio Flash||no PC Sync||PC Sync socket|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||no HDMI|
|Wifi Support||no Wifi||no Wifi|
|Body Specs||Panasonic G1||Pentax 645D|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||410 shots per charge||800 shots per charge|
124 x 84 x 45 mm
(4.9 x 3.3 x 1.8 in)
156 x 117 x 119 mm
(6.1 x 4.6 x 4.7 in)
|Camera Weight||360 g (12.7 oz)||1480 g (52.2 oz)|
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