Nikon D3100 vs Sony A7 III
The Nikon D3100 and the Sony Alpha A7 III are two digital cameras that were announced, respectively, in August 2010 and February 2018. The D3100 is a DSLR, while the A7 III is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (D3100) and a full frame (A7 III) sensor. The Nikon has a resolution of 14.2 megapixels, whereas the Sony provides 24 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 Nikon D3100 and the Sony Alpha A7 III? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.
The physical size and weight of the Nikon D3100 and the Sony A7 III are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.
The D3100 can be obtained in two different colors (black, red), while the A7 III 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 Sony A7 III is somewhat larger (2 percent) than the Nikon D3100. Moreover, the A7 III is markedly heavier (29 percent) than the D3100. It is noteworthy in this context that the A7 III 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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can compare the optics available for the two cameras in the Nikon Lens Catalog (D3100) and the Sony FE Lens Catalog (A7 III). Mirrorless cameras, such as the A7 III, have moreover the advantage that they can use many lenses from other systems via adapters, as they have a relatively short flange to focal plane distance.
Concerning battery life, the D3100 gets 550 shots out of its EN-EL14 battery, while the A7 III can take 610 images on a single charge of its NP-FZ100 power pack. The power pack in the A7 III can be charged via the USB port, which can be very convenient when travelling.
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, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.
|1.||Nikon D3100||124 mm||96 mm||75 mm||505 g||550||n||Aug 2010||599||ebay.com|
|2.||Sony A7 III||127 mm||96 mm||74 mm||650 g||610||Y||Feb 2018||1,999||amazon.com|
|3.||Nikon Z6||134 mm||101 mm||67 mm||675 g||310||Y||Aug 2018||1,999||ebay.com|
|4.||Nikon D3200||125 mm||96 mm||77 mm||505 g||540||n||Apr 2012||599||ebay.com|
|5.||Nikon D5100||128 mm||97 mm||79 mm||560 g||660||n||Apr 2011||749||ebay.com|
|6.||Nikon D7000||132 mm||105 mm||77 mm||780 g||1050||Y||Sep 2010||1,499||ebay.com|
|7.||Nikon D3000||126 mm||97 mm||64 mm||536 g||500||n||Jul 2009||599||ebay.com|
|8.||Nikon D5000||127 mm||104 mm||80 mm||590 g||510||n||Apr 2009||749||ebay.com|
|9.||Nikon D60||126 mm||94 mm||64 mm||522 g||500||n||Jan 2008||629||ebay.com|
|10.||Nikon D40X||124 mm||94 mm||64 mm||522 g||520||n||Mar 2007||729||ebay.com|
|11.||Nikon D40||124 mm||94 mm||64 mm||522 g||470||n||Nov 2006||499||ebay.com|
|12.||Sony A7R IV||129 mm||96 mm||78 mm||665 g||670||Y||Jul 2019||3,499||amazon.com|
|13.||Sony A7R III||127 mm||96 mm||74 mm||650 g||650||Y||Oct 2017||3,199||ebay.com|
|14.||Sony A9||127 mm||96 mm||63 mm||673 g||650||Y||Apr 2017||4,499||ebay.com|
|15.||Sony A7 II||127 mm||96 mm||60 mm||599 g||350||Y||Nov 2014||1,999||ebay.com|
|16.||Sony NEX-5N||111 mm||59 mm||38 mm||269 g||460||n||Aug 2011||699||ebay.com|
|17.||Sony NEX-C3||110 mm||60 mm||33 mm||225 g||400||n||Jun 2011||599||ebay.com|
|Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
Any camera decision will naturally be influenced heavily by the price. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The D3100 was launched at a markedly lower price (by 70 percent) than the A7 III, 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 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. 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 associated with larger, more expensive camera bodies and lenses.
Of the two cameras under consideration, the Nikon D3100 features an APS-C sensor and the Sony A7 III a full frame sensor. The sensor area in the A7 III is 138 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
With 24MP, the A7 III offers a higher resolution than the D3100 (14.2MP), but the A7 III nevertheless has larger individual pixels (pixel pitch of 5.94μm versus 5.01μm for the D3100) due to its larger sensor. Moreover, the A7 III is a much more recent model (by 7 years and 6 months) than the D3100, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units.
The resolution advantage of the Sony A7 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7 III for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Nikon D3100 are 23 x 15.4 inches or 58.5 x 39 cm for good quality, 18.4 x 12.3 inches or 46.8 x 31.2 cm for very good quality, and 15.4 x 10.2 inches or 39 x 26 cm for excellent quality prints.
The A7 III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
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 Sony Alpha A7 III are ISO 100 to ISO 51200, with the possibility to increase the ISO range to 50-204800.
In terms of underlying technology, the D3100 is build around a CMOS sensor, while the A7 III uses a BSI-CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 A7 III offers substantially better image quality than the D3100 (overall score 29 points higher). The advantage is based on 2.5 bits higher color depth, 3.4 EV in additional dynamic range, and 2 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.
|2.||Sony A7 III||Full Frame||24.0||6000||4000||4K/30p||25.0||14.7||3730||96|
|3.||Nikon Z6||Full Frame||24.3||6048||4024||4K/30p||25.3||14.3||3299||95|
|12.||Sony A7R IV||Full Frame||60.2||9504||6336||4K/30p||26.0||14.8||3344||99|
|13.||Sony A7R III||Full Frame||42.2||7952||5304||4K/30p||26.0||14.7||3523||100|
|14.||Sony A9||Full Frame||24.0||6000||4000||4K/30p||24.9||13.3||3517||92|
|15.||Sony A7 II||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the A7 III provides a better video resolution than the D3100. It can shoot movie footage at 4K/30p, while the Nikon is limited to 1080/24p.
Beyond body and sensor, cameras can and do differ across a range of features. For example, the A7 III has an electronic viewfinder (2359k dots), while the D3100 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 A7 III offers a wider field of view (100%) 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 A7 III 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 Sony A7 III in connection with corresponding information for a sample of similar cameras.
|1.||Nikon D3100||optical||n||3.0 / 230||fixed||n||1/4000s||3.0/s||Y||n|
|2.||Sony A7 III||2359||n||3.0 / 922||tilting||Y||1/8000s||10.0/s||n||Y|
|3.||Nikon Z6||3690||Y||3.2 / 2100||tilting||Y||1/8000s||12.0/s||n||Y|
|4.||Nikon D3200||optical||n||3.0 / 921||fixed||n||1/4000s||4.0/s||Y||n|
|5.||Nikon D5100||optical||n||3.0 / 921||swivel||n||1/4000s||4.0/s||Y||n|
|6.||Nikon D7000||optical||Y||3.0 / 921||fixed||n||1/8000s||6.0/s||Y||n|
|7.||Nikon D3000||optical||n||3.0 / 230||fixed||n||1/4000s||3.0/s||Y||n|
|8.||Nikon D5000||optical||n||2.7 / 230||full-flex||n||1/4000s||4.0/s||Y||n|
|9.||Nikon D60||optical||n||2.5 / 230||fixed||n||1/4000s||3.0/s||Y||n|
|10.||Nikon D40X||optical||n||2.5 / 230||fixed||n||1/4000s||3.0/s||Y||n|
|11.||Nikon D40||optical||n||2.5 / 230||fixed||n||1/4000s||2.5/s||Y||n|
|12.||Sony A7R IV||5760||n||3.0 / 1440||tilting||Y||1/8000s||10.0/s||n||Y|
|13.||Sony A7R III||3686||n||3.0 / 1440||tilting||Y||1/8000s||10.0/s||n||Y|
|14.||Sony A9||3686||n||3.0 / 1440||tilting||Y||1/8000s||20.0/s||n||Y|
|15.||Sony A7 II||2400||n||3.0 / 1230||tilting||n||1/8000s||5.0/s||n||Y|
|16.||Sony NEX-5N||optional||n||3.0 / 920||tilting||Y||1/4000s||10.0/s||n||n|
|17.||Sony NEX-C3||optional||n||3.0 / 920||tilting||n||1/4000s||5.5/s||n||n|
|Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.|
One difference between the cameras concerns the presence of an on-board flash. The D3100 has one, while the A7 III 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 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 A7 III 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 Sony A7 III 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 D3100 writes its imaging data to SDXC cards, while the A7 III uses SDXC or Memory Stick PRO Duo cards. The A7 III features dual card slots, which can be very useful in case a memory card fails. In contrast, the D3100 only has one slot. The A7 III supports UHS-II cards on its first slot and UHS-I on its second one, while the D3100 cannot take advantage of Ultra High Speed SD cards.
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 Sony Alpha A7 III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Nikon D3100||Y||mono / mono||-||-||mini||2.0||-||-||-|
|2.||Sony A7 III||Y||stereo / mono||Y||Y||micro||3.1||Y||Y||Y|
|3.||Nikon Z6||Y||stereo / mono||Y||Y||micro||3.1||Y||-||Y|
|4.||Nikon D3200||Y||mono / mono||Y||-||mini||2.0||-||-||-|
|5.||Nikon D5100||Y||mono / mono||Y||-||mini||2.0||-||-||-|
|6.||Nikon D7000||Y||mono / mono||Y||-||mini||2.0||-||-||-|
|7.||Nikon D3000||Y||- / -||-||-||-||2.0||-||-||-|
|8.||Nikon D5000||Y||mono / mono||-||-||mini||2.0||-||-||-|
|9.||Nikon D60||Y||- / -||-||-||-||2.0||-||-||-|
|10.||Nikon D40X||Y||- / -||-||-||-||2.0||-||-||-|
|11.||Nikon D40||Y||- / -||-||-||-||2.0||-||-||-|
|12.||Sony A7R IV||Y||stereo / mono||Y||Y||micro||3.1||Y||Y||Y|
|13.||Sony A7R III||Y||stereo / mono||Y||Y||micro||3.1||Y||Y||Y|
|14.||Sony A9||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||Y|
|15.||Sony A7 II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|16.||Sony NEX-5N||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|17.||Sony NEX-C3||Y||stereo / mono||-||-||mini||2.0||-||-||-|
It is notable that the A7 III offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the D3100 does not provide wifi capability.
The A7 III is a recent model that features in the current product line-up of Sony. In contrast, the D3100 has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the D3100 was succeeded 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 Sony websites.
So what conclusions can be drawn? Is the Nikon D3100 better than the Sony A7 III or vice versa? The listing below highlights the relative strengths of the two models.
Reasons to prefer the Nikon D3100:
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- Less heavy: Is lighter (by 145g or 22 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 (70 percent cheaper at launch).
- More heavily discounted: Has been available for much longer (launched in August 2010).
Advantages of the Sony Alpha A7 III:
- More detail: Has more megapixels (24 vs 14.2MP), which boosts linear resolution by 30%.
- Better image quality: Scores substantially higher (29 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (2.5 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (3.4 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (2 stops ISO advantage).
- Better video: Provides higher definition movie capture (4K/30p vs 1080/24p).
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Better sound: Can connect to an external microphone for higher quality sound recording.
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- 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 95%).
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.53x).
- More detailed LCD: Has a higher resolution rear screen (922k vs 230k dots).
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Faster burst: Shoots at higher frequency (10 vs 3 flaps/sec) to capture the decisive moment.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Longer lasting: Gets more shots (610 versus 550) out of a single battery charge.
- Easier travel charging: Can be conveniently charged via its USB port.
- Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
- More legacy lens friendly: Can use many non-native lenses via adapters.
- Faster data transfer: Supports a more advanced USB protocol (3.1 vs 2.0).
- 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.
- Easier wireless transfer: Supports Bluetooth for image sharing without cables.
- Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
- Faster buffer clearing: Supports Ultra High Speed (UHS-II and UHS-I) SDXC cards.
- More modern: Reflects 7 years and 6 months of technical progress since the D3100 launch.
If the count of individual advantages (bullet points above) is taken as a guide, the A7 III is the clear winner of the contest (31 : 5 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.
How about other alternatives? Do the specifications of the Nikon D3100 and the Sony A7 III place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens 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 partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the D3100 or the A7 III. 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 where reviews by experts come in. 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.
|1.||Nikon D3100||5/5||+ +||..||72/100||4.5/5||4.5/5||Aug 2010||599||ebay.com|
|2.||Sony A7 III||..||+ +||4.5/5||89/100||5/5||5/5||Feb 2018||1,999||amazon.com|
|3.||Nikon Z6||5/5||..||5/5||89/100||4.5/5||5/5||Aug 2018||1,999||ebay.com|
|4.||Nikon D3200||5/5||+ +||..||73/100||4.5/5||4.5/5||Apr 2012||599||ebay.com|
|5.||Nikon D5100||5/5||+ +||..||76/100||4.5/5||4.5/5||Apr 2011||749||ebay.com|
|6.||Nikon D7000||4/5||..||..||80/100||4.5/5||4.5/5||Sep 2010||1,499||ebay.com|
|7.||Nikon D3000||..||+||..||72/100||4/5||4.5/5||Jul 2009||599||ebay.com|
|8.||Nikon D5000||..||+ +||..||75/100||4/5||4.5/5||Apr 2009||749||ebay.com|
|9.||Nikon D60||..||80/100||..||+ +||4/5||4.5/5||Jan 2008||629||ebay.com|
|10.||Nikon D40X||..||79/100||..||+ +||4/5||4/5||Mar 2007||729||ebay.com|
|11.||Nikon D40||..||81/100||..||+ +||o||4.5/5||Nov 2006||499||ebay.com|
|12.||Sony A7R IV||5/5||+||4.5/5||91/100||4.5/5||5/5||Jul 2019||3,499||amazon.com|
|13.||Sony A7R III||..||+ +||4/5||90/100||4.5/5||5/5||Oct 2017||3,199||ebay.com|
|14.||Sony A9||5/5||+ +||4.8/5||89/100||5/5||5/5||Apr 2017||4,499||ebay.com|
|15.||Sony A7 II||5/5||+||4/5||82/100||4.5/5||5/5||Nov 2014||1,999||ebay.com|
|16.||Sony NEX-5N||3/5||+ +||..||79/100||4.5/5||4.5/5||Aug 2011||699||ebay.com|
|17.||Sony NEX-C3||3/5||+ +||..||74/100||4.5/5||4/5||Jun 2011||599||ebay.com|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. 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? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes below. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.
- Canon 30D vs Nikon D3100
- Canon 50D vs Sony A7 III
- Fujifilm X-T10 vs Sony A7 III
- Leica S Typ 006 vs Nikon D3100
- Leica X1 vs Sony A7 III
- Nikon B500 vs Nikon D3100
- Nikon D3100 vs Nikon D3200
- Nikon D3100 vs Panasonic FZ100
- Nikon D3100 vs Samsung NX30
- Nikon P950 vs Sony A7 III
- Pentax K-30 vs Sony A7 III
- Sony A7 III vs Sony A99
Specifications: Nikon D3100 vs Sony A7 III
Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.
|Camera Model||Nikon D3100||Sony A7 III|
|Camera Type||Digital single lens reflex||Mirrorless system camera|
|Camera Lens||Nikon F mount lenses||Sony E mount lenses|
|Launch Date||August 2010||February 2018|
|Launch Price||USD 599||USD 1,999|
|Sensor Specs||Nikon D3100||Sony A7 III|
|Sensor Format||APS-C Sensor||Full Frame Sensor|
|Sensor Size||23.1 x 15.4 mm||35.6 x 23.8 mm|
|Sensor Area||355.74 mm2||847.28 mm2|
|Sensor Diagonal||27.8 mm||42.8 mm|
|Sensor Resolution||14.2 Megapixels||24 Megapixels|
|Image Resolution||4608 x 3072 pixels||6000 x 4000 pixels|
|Pixel Pitch||5.01 μm||5.94 μm|
|Pixel Density||3.98 MP/cm2||2.83 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/24p Video||4K/30p Video|
|ISO Setting||100 - 3,200 ISO||100 - 51,200 ISO|
|ISO Boost||100 - 12,800 ISO||50 - 204,800 ISO|
|Image Processor||EXPEED 2||BIONZ X|
|DXO Sensor Quality (score)||67||96|
|DXO Color Depth (bits)||22.5||25.0|
|DXO Dynamic Range (EV)||11.3||14.7|
|DXO Low Light (ISO)||919||3730|
|Screen Specs||Nikon D3100||Sony A7 III|
|Viewfinder Type||Optical viewfinder||Electronic viewfinder|
|Viewfinder Field of View||95%||100%|
|Viewfinder Resolution||2359k dots|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||230k dots||922k dots|
|LCD Attachment||Fixed screen||Tilting screen|
|Touch Input||no Touchscreen||Touchscreen|
|Shooting Specs||Nikon D3100||Sony A7 III|
|Focus System||Phase-detect AF||On-Sensor Phase-detect|
|Manual Focusing Aid||no Peaking Feature||Focus Peaking|
|Max Shutter Speed (mechanical)||1/4000s||1/8000s|
|Continuous Shooting||3 shutter flaps/s||10 shutter flaps/s|
|Shutter Life Expectancy||100 000 actuations||200 000 actuations|
|Electronic Shutter||no E-Shutter||YES|
|Time-Lapse Photography||no Intervalometer||Intervalometer built-in|
|Image Stabilization||Lens stabilization only||In-body stabilization|
|Fill Flash||Built-in Flash||no On-Board Flash|
|Storage Medium||SDXC cards||MS or SDXC cards|
|Second Storage Option||Single card slot||Dual card slots|
|UHS card support||no||Single UHS-II|
|Connectivity Specs||Nikon D3100||Sony A7 III|
|USB Connector||USB 2.0||USB 3.1|
|HDMI Port||mini HDMI||micro HDMI|
|Microphone Port||no MIC socket||External MIC port|
|Headphone Socket||no Headphone port||Headphone port|
|Wifi Support||no Wifi||Wifi built-in|
|Near-Field Communication||no NFC||NFC built-in|
|Bluetooth Support||no Bluetooth||Bluetooth built-in|
|Body Specs||Nikon D3100||Sony A7 III|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||550 shots per charge||610 shots per charge|
|In-Camera Charging||no USB charging||USB charging|
124 x 96 x 75 mm
(4.9 x 3.8 x 3.0 in)
127 x 96 x 74 mm
(5.0 x 3.8 x 2.9 in)
|Camera Weight||505 g (17.8 oz)||650 g (22.9 oz)|
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