Nikon D3100 vs Pentax 645D
The Nikon D3100 and the Pentax 645D are two digital cameras that were officially introduced, respectively, in August 2010 and March 2010. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (D3100) and a medium format (645D) sensor. The Nikon has a resolution of 14.2 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.
|Nikon D3100||Pentax 645D|
|Digital single lens reflex||Digital single lens reflex|
|Nikon F mount lenses||Pentax 645 mount lenses|
|14.2 MP, APS-C Sensor||39.5 MP, Medium Format Sensor|
|1080/24p Video||no Video|
|ISO 100-3200 (100-12800)||ISO 100-1600|
|Optical viewfinder||Optical viewfinder|
|3.0" LCD, 230k dots||3.0" LCD, 921k dots|
|Fixed screen (not touch-sensitive)||Fixed screen (not touch-sensitive)|
|3 shutter flaps per second||1.1 shutter flaps per second|
|Not weather sealed||Weathersealed body|
|550 shots per battery charge||800 shots per battery charge|
|124 x 96 x 75 mm, 505 g||156 x 117 x 119 mm, 1480 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D3100 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.
The side-by-side display below illustrates the physical size and weight of the Nikon D3100 and the Pentax 645D. 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 D3100 can be obtained in two different colors (black, red), while the 645D is only available in black.
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 (53 percent) than the Nikon D3100. Moreover, the 645D is substantially heavier (193 percent) than the D3100. It is noteworthy in this context that the 645D is splash and dust-proof, while the D3100 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 adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you would like to visualize and compare a different camera combination, 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.
|Nikon D3100»||4.9 in||3.8 in||3.0 in||17.8 oz||550||n||Aug 2010||599||-||Nikon D3100|
|Pentax 645D«||6.1 in||4.6 in||4.7 in||52.2 oz||800||Y||Mar 2010||9,995||-||Pentax 645D|
|Canon 1D X« »||6.2 in||6.6 in||3.3 in||54.7 oz||1120||Y||Oct 2011||6,799||-||Canon 1D X|
|Canon 1D Mark IV« »||6.1 in||6.2 in||3.1 in||43.4 oz||1500||Y||Oct 2009||4,999||-||Canon 1D Mark IV|
|Leica S Typ 006« »||6.3 in||4.7 in||3.1 in||44.4 oz||..||Y||Sep 2012||21,950||-||Leica S Typ 006|
|Nikon D3200« »||4.9 in||3.8 in||3.0 in||17.8 oz||540||n||Apr 2012||599||-||Nikon D3200|
|Nikon D5100« »||5.0 in||3.8 in||3.1 in||19.8 oz||660||n||Apr 2011||749||-||Nikon D5100|
|Nikon D7000« »||5.2 in||4.1 in||3.0 in||27.5 oz||1050||Y||Sep 2010||1,499||-||Nikon D7000|
|Nikon D3S« »||6.3 in||6.2 in||3.5 in||43.7 oz||4200||Y||Oct 2009||5,199||-||Nikon D3S|
|Nikon D3000« »||5.0 in||3.8 in||2.5 in||18.9 oz||500||n||Jul 2009||599||-||Nikon D3000|
|Nikon D5000« »||5.0 in||4.1 in||3.1 in||20.8 oz||510||n||Apr 2009||749||-||Nikon D5000|
|Nikon D60« »||5.0 in||3.7 in||2.5 in||18.4 oz||500||n||Jan 2008||629||-||Nikon D60|
|Nikon D40X« »||4.9 in||3.7 in||2.5 in||18.4 oz||520||n||Mar 2007||729||-||Nikon D40X|
|Nikon D40« »||4.9 in||3.7 in||2.5 in||18.4 oz||470||n||Nov 2006||499||-||Nikon D40|
|Pentax 645Z« »||6.1 in||4.6 in||4.8 in||54.7 oz||650||Y||Apr 2014||8,499||Pentax 645Z|
|Sony NEX-5N« »||4.4 in||2.3 in||1.5 in||9.5 oz||460||n||Aug 2011||699||-||Sony NEX-5N|
|Sony NEX-C3« »||4.3 in||2.4 in||1.3 in||7.9 oz||400||n||Jun 2011||599||-||Sony NEX-C3|
|Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.|
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 D3100 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Nikon D3100 features an APS-C sensor and the Pentax 645D a medium format sensor. The sensor area in the 645D is 308 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 0.79. The sensor in the D3100 has a native 3:2 aspect ratio, while the one in the 645D offers a 4:3 aspect.
With 39.5MP, the 645D offers a higher resolution than the D3100 (14.2MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 5.01μm for the D3100) due to its larger sensor. However, the D3100 is a somewhat more recent model (by 5 months) than the 645D, and its sensor might 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 inch or 92.3 x 69.1 cm, for very good quality (250 dpi) 29.1 x 21.8 inch or 73.8 x 55.3 cm, and for excellent quality (300 dpi) 24.2 x 18.1 inch or 61.5 x 46.1 cm. The corresponding values for the Nikon D3100 are 23 x 15.4 inch or 58.5 x 39 cm for good quality, 18.4 x 12.3 inch or 46.8 x 31.2 cm for very good quality, and 15.4 x 10.2 inch or 39 x 26 cm for excellent quality prints.
The Nikon D3100 has a native sensitivity range from ISO 100 to ISO 3200, which can be extended to ISO 100-12800. The corresponding ISO settings for the Pentax 645D are ISO 100 to ISO 1600 (no boost).
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 D3100 (overall score 15 points higher). The advantage is based on 2.1 bits higher color depth, 1.3 EV in additional dynamic range, and 0.5 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.
|Nikon D3100»||APS-C||14.2||4608||3072||1080/24p||22.5||11.3||919||67||Nikon D3100|
|Pentax 645D«||Medium Format||39.5||7264||5440||-||24.6||12.6||1262||82||Pentax 645D|
|Canon 1D X« »||Full Frame||17.9||5184||3456||1080/30p||23.8||11.8||2786||82||Canon 1D X|
|Canon 1D Mark IV« »||APS-H||16.0||4896||3264||1080/30p||22.8||12.0||1320||74||Canon 1D Mark IV|
|Leica S Typ 006« »||Medium Format||37.5||7500||5000||-||23.9||12.2||824||76||Leica S Typ 006|
|Nikon D3200« »||APS-C||24.1||6016||4000||1080/30p||24.1||13.2||1131||81||Nikon D3200|
|Nikon D5100« »||APS-C||16.1||4928||3264||1080/30p||23.5||13.6||1183||80||Nikon D5100|
|Nikon D7000« »||APS-C||16.1||4928||3264||10800/24p||23.5||13.9||1167||80||Nikon D7000|
|Nikon D3S« »||Full Frame||12.1||4256||2832||720/24p||23.5||12.0||3253||82||Nikon D3S|
|Nikon D3000« »||APS-C||10.0||3872||2592||-||22.3||11.1||563||62||Nikon D3000|
|Nikon D5000« »||APS-C||12.2||4288||2848||720/24p||22.7||12.5||868||72||Nikon D5000|
|Nikon D60« »||APS-C||10.0||3872||2592||-||22.5||11.4||562||65||Nikon D60|
|Nikon D40X« »||APS-C||10.0||3872||2592||-||22.4||11.4||516||63||Nikon D40X|
|Nikon D40« »||APS-C||6.0||3008||2000||-||21.0||11.0||561||56||Nikon D40|
|Pentax 645Z« »||Medium Format||51.1||8256||6192||1080/60i||26.0||14.7||4505||101||Pentax 645Z|
|Sony NEX-5N« »||APS-C||16.0||4912||3264||1080/60i||23.6||12.7||1079||77||Sony NEX-5N|
|Sony NEX-C3« »||APS-C||16.0||4912||3264||720/30p||22.7||12.2||1083||73||Sony NEX-C3|
Many modern cameras cannot only take still pictures, but also record videos. The D3100 indeed provides movie recording capabilities, while the 645D does not. The highest resolution format that the D3100 can use is 1080/24p.
Apart from body and sensor, cameras can and do differ across a variety of features. The D3100 and the 645D are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The viewfinder in the 645D offers a wider field of view (98%) than the one in the D3100 (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the 645D has a higher magnification (0.78x vs 0.53x), 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 Nikon D3100 and Pentax 645D in connection with corresponding information for a sample of similar cameras.
|Nikon D3100»||optical||n||3.0||230||fixed||n||1/4000s||3.0||Y||n||Nikon D3100|
|Pentax 645D«||optical||Y||3.0||921||fixed||n||1/4000s||1.1||n||n||Pentax 645D|
|Canon 1D X« »||optical||Y||3.2||1040||fixed||n||1/8000s||14.0||n||n||Canon 1D X|
|Canon 1D Mark IV« »||optical||Y||3.0||920||fixed||n||1/8000s||10.0||n||n||Canon 1D Mark IV|
|Leica S Typ 006« »||optical||Y||3.0||922||fixed||n||1/4000s||1.5||n||n||Leica S Typ 006|
|Nikon D3200« »||optical||n||3.0||921||fixed||n||1/4000s||4.0||Y||n||Nikon D3200|
|Nikon D5100« »||optical||n||3.0||921||swivel||n||1/4000s||4.0||Y||n||Nikon D5100|
|Nikon D7000« »||optical||Y||3.0||921||fixed||n||1/8000s||6.0||Y||n||Nikon D7000|
|Nikon D3S« »||optical||Y||3.0||921||fixed||n||1/8000s||11.0||n||n||Nikon D3S|
|Nikon D3000« »||optical||n||3.0||230||fixed||n||1/4000s||3.0||Y||n||Nikon D3000|
|Nikon D5000« »||optical||n||2.7||230||full-flex||n||1/4000s||4.0||Y||n||Nikon D5000|
|Nikon D60« »||optical||n||2.5||230||fixed||n||1/4000s||3.0||Y||n||Nikon D60|
|Nikon D40X« »||optical||n||2.5||230||fixed||n||1/4000s||3.0||Y||n||Nikon D40X|
|Nikon D40« »||optical||n||2.5||230||fixed||n||1/4000s||2.5||Y||n||Nikon D40|
|Pentax 645Z« »||optical||Y||3.2||1037||tilting||n||1/4000s||3.0||n||n||Pentax 645Z|
|Sony NEX-5N« »||-||n||3.0||920||tilting||Y||1/4000s||10.0||n||n||Sony NEX-5N|
|Sony NEX-C3« »||-||n||3.0||920||tilting||n||1/4000s||5.5||n||n||Sony NEX-C3|
One difference between the cameras concerns the presence of an on-board flash. The D3100 has one, while the 645D does not. While the built-in flash of the D3100 is not very powerful, it can at times be useful as a fill-in light.
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.
Concerning the storage of imaging data, both the D3100 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 D3100 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 Nikon D3100 and Pentax 645D and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
|Nikon D3100»||Y||mono||mono||-||-||mini||2.0||-||-||-||Nikon D3100|
|Pentax 645D«||Y||stereo||-||-||-||-||2.0||-||-||-||Pentax 645D|
|Canon 1D X« »||Y||mono||-||Y||-||mini||2.0||-||-||-||Canon 1D X|
|Canon 1D Mark IV« »||Y||stereo||-||Y||-||mini||2.0||-||-||-||Canon 1D Mark IV|
|Leica S Typ 006« »||Y||-||-||-||-||mini||2.0||-||-||-||Leica S Typ 006|
|Nikon D3200« »||Y||mono||mono||Y||-||mini||2.0||-||-||-||Nikon D3200|
|Nikon D5100« »||Y||mono||mono||Y||-||mini||2.0||-||-||-||Nikon D5100|
|Nikon D7000« »||Y||mono||mono||Y||-||mini||2.0||-||-||-||Nikon D7000|
|Nikon D3S« »||Y||stereo||-||-||-||mini||2.0||-||-||-||Nikon D3S|
|Nikon D3000« »||Y||-||-||-||-||-||2.0||-||-||-||Nikon D3000|
|Nikon D5000« »||Y||mono||mono||-||-||mini||2.0||-||-||-||Nikon D5000|
|Nikon D60« »||Y||-||-||-||-||-||2.0||-||-||-||Nikon D60|
|Nikon D40X« »||Y||-||-||-||-||-||2.0||-||-||-||Nikon D40X|
|Nikon D40« »||Y||-||-||-||-||-||2.0||-||-||-||Nikon D40|
|Pentax 645Z« »||Y||stereo||mono||Y||-||mini||3.0||-||-||-||Pentax 645Z|
|Sony NEX-5N« »||Y||stereo||mono||-||-||mini||2.0||-||-||-||Sony NEX-5N|
|Sony NEX-C3« »||Y||stereo||mono||-||-||mini||2.0||-||-||-||Sony NEX-C3|
Studio photographers will appreciate that the Pentax 645D (unlike the D3100) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the D3100 and the 645D have been discontinued, but can regularly be found used on eBay. The 645D was replaced by the Pentax 645Z, while the D3100 was followed by the Nikon D3200. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Nikon and Pentax websites.
So what conclusions can be drawn? Which of the two cameras – the Nikon D3100 or the Pentax 645D – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.
Reasons to prefer the Nikon D3100:
- 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 1080/24p movies.
- Faster burst: Shoots at higher frequency (3 vs 1.1 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (124x96mm vs 156x117mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 975g or 66 percent) and hence easier to carry around.
- 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 modern: Is somewhat more recent (announced 5 months after the 645D).
Advantages of the Pentax 645D:
- More detail: Has more megapixels (39.5 vs 14.2MP), which boosts linear resolution by 64%.
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- Better image quality: Scores substantially higher (15 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (2.1 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (1.3 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (0.5 stops ISO advantage).
- More complete view: Has a viewfinder with a larger field of view (98% vs 95%).
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.53x).
- Easier setting verification: Features a control panel on top to check shooting parameters.
- More detailed LCD: Has a higher resolution rear screen (921k vs 230k dots).
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Longer lasting: Gets more shots (800 versus 550) 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 on the market for longer (launched in March 2010).
If the count of individual advantages (bullet points above) is taken as a guide, the 645D is the clear winner of the contest (16 : 8 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 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.
How about other alternatives? Do the specifications of the Nikon D3100 and the Pentax 645D place the cameras among the top in their class? Find out in the latest Best DSLR Camera listing 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 incomplete and does no justice, for example, to the way the D3100 or the 645D perform in practice. 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.
This is why expert reviews 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.
|Nikon D3100»||+ +||72/100||4.5/5||5/5||4.5/5||Aug 2010||599||-||Nikon D3100|
|Pentax 645D«||-||-||-||4.5/5||-||Mar 2010||9,995||-||Pentax 645D|
|Canon 1D X« »||-||-||4.5/5||4.5/5||4.5/5||Oct 2011||6,799||-||Canon 1D X|
|Canon 1D Mark IV« »||-||89/100||-||5/5||-||Oct 2009||4,999||-||Canon 1D Mark IV|
|Leica S Typ 006« »||-||-||-||-||-||Sep 2012||21,950||-||Leica S Typ 006|
|Nikon D3200« »||+ +||73/100||4.5/5||4.5/5||4.5/5||Apr 2012||599||-||Nikon D3200|
|Nikon D5100« »||+ +||76/100||4.5/5||5/5||4.5/5||Apr 2011||749||-||Nikon D5100|
|Nikon D7000« »||-||80/100||4.5/5||5/5||4.5/5||Sep 2010||1,499||-||Nikon D7000|
|Nikon D3S« »||-||89/100||4.5/5||5/5||5/5||Oct 2009||5,199||-||Nikon D3S|
|Nikon D3000« »||+||72/100||4/5||3.5/5||4.5/5||Jul 2009||599||-||Nikon D3000|
|Nikon D5000« »||+ +||75/100||4/5||5/5||4.5/5||Apr 2009||749||-||Nikon D5000|
|Nikon D60« »||80/100||+ +||4/5||o||4.5/5||Jan 2008||629||-||Nikon D60|
|Nikon D40X« »||79/100||+ +||4/5||o||4/5||Mar 2007||729||-||Nikon D40X|
|Nikon D40« »||81/100||+ +||o||5/5||4.5/5||Nov 2006||499||-||Nikon D40|
|Pentax 645Z« »||-||-||4.5/5||5/5||5/5||Apr 2014||8,499||Pentax 645Z|
|Sony NEX-5N« »||+ +||79/100||4.5/5||5/5||4.5/5||Aug 2011||699||-||Sony NEX-5N|
|Sony NEX-C3« »||+ +||74/100||4.5/5||4.5/5||4/5||Jun 2011||599||-||Sony NEX-C3|
|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. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.
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 make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.
- Canon D60 vs Nikon D3100
- Canon SX620 vs Nikon D3100
- Canon T5 vs Nikon D3100
- Nikon 1 V3 vs Nikon D3100
- Nikon D2H vs Pentax 645D
- Nikon D3100 vs Nikon D40X
- Nikon D3100 vs Olympus XZ-2
- Nikon D3100 vs Panasonic G7
- Nikon D3100 vs Panasonic GH1
- Nikon D3100 vs Sony RX1
- Olympus E-P1 vs Pentax 645D
- Panasonic FZ82 vs Pentax 645D
Specifications: Nikon D3100 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||Nikon D3100||Pentax 645D|
|Camera Type||Digital single lens reflex||Digital single lens reflex|
|Camera Lens||Nikon F mount lenses||Pentax 645 mount lenses|
|Launch Date||August 2010||March 2010|
|Launch Price||USD 599||USD 9995|
|Sensor Specs||Nikon D3100||Pentax 645D|
|Sensor Format||APS-C Sensor||Medium Format Sensor|
|Sensor Size||23.1 x 15.4 mm||44.0 x 33.0 mm|
|Sensor Area||355.74 mm2||1452 mm2|
|Sensor Diagonal||27.8 mm||55 mm|
|Sensor Resolution||14.2 Megapixels||39.5 Megapixels|
|Image Resolution||4608 x 3072 pixels||7264 x 5440 pixels|
|Pixel Pitch||5.01 μm||6.06 μm|
|Pixel Density||3.98 MP/cm2||2.72 MP/cm2|
|Moiré control||Anti-Alias filter||no AA filter|
|Movie Capability||1080/24p Video||no Video|
|ISO Setting||100-3200 ISO||100-1600 ISO|
|ISO Boost||100-12800 ISO||no Enhancement|
|Image Processor||EXPEED 2||PRIME II|
|DXO Sensor Quality (score)||67||82|
|DXO Color Depth (bits)||22.5||24.6|
|DXO Dynamic Range (EV)||11.3||12.6|
|DXO Low Light (ISO)||919||1262|
|Screen Specs||Nikon D3100||Pentax 645D|
|Viewfinder Type||Optical viewfinder||Optical viewfinder|
|Viewfinder Field of View||95%||98%|
|Top-Level Screen||no Top Display||Control Panel|
|LCD Framing||Live View|
|Rear LCD Size||3.0 inch||3.0 inch|
|LCD Resolution||230k dots||921k dots|
|LCD Attachment||Fixed screen||Fixed screen|
|Shooting Specs||Nikon D3100||Pentax 645D|
|Autofocus System||Phase-detect AF||Phase-detect AF|
|Continuous Shooting||3 shutter flaps/s||1.1 shutter flaps/s|
|Shutter Life Expectancy||100 000 actuations||50 000 actuations|
|Time-Lapse Photography||no Intervalometer||Intervalometer 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||no||no|
|Connectivity Specs||Nikon D3100||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||Nikon D3100||Pentax 645D|
|Environmental Sealing||Not weather sealed||Weathersealed body|
|Battery Life (CIPA)||550 shots per charge||800 shots per charge|
124 x 96 x 75 mm
(4.9 x 3.8 x 3.0 in)
156 x 117 x 119 mm
(6.1 x 4.6 x 4.7 in)
|Camera Weight||505 g (17.8 oz)||1480 g (52.2 oz)|
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