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Nikon D3100 vs Sony A7S

The Nikon D3100 and the Sony Alpha A7S are two digital cameras that were announced, respectively, in August 2010 and April 2014. The D3100 is a DSLR, while the A7S is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (D3100) and a full frame (A7S) sensor. The Nikon has a resolution of 14.2 megapixels, whereas the Sony provides 12 MP.

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

Headline Specifications
Nikon D3100
versus
Sony A7S
Nikon D3100   Sony A7S
Digital single lens reflex Mirrorless system camera
Nikon F mount lenses Sony E mount lenses
14.2 MP – APS-C sensor 12 MP – Full Frame sensor
1080/24p Video 1080/60p Video
ISO 100-3,200 (100 - 12,800) ISO 100-102,400 (50 - 409,600)
Optical viewfinder Electronic viewfinder (2400k dots)
3.0" LCD – 230k dots 3.0" LCD – 921k dots
Fixed screen (not touch-sensitive) Tilting screen (no touchscreen)
3 shutter flaps per second 5 shutter flaps per second
not weather sealedWeathersealed body
550 shots per battery charge380 shots per battery charge
124 x 96 x 75 mm, 505 g 127 x 94 x 48 mm, 489 g
Nikon D3100:
Check current offers at
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Sony A7S:
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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D3100 and the Sony Alpha A7S? 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 Nikon D3100 and the Sony A7S 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 width, height and depth dimensions are rounded to the nearest millimeter.

The D3100 can be obtained in two different colors (black, red), while the A7S is only available in black.

Size Nikon D3100 vs Sony A7S
Compare D3100 versus A7S top
Comparison D3100 or A7S rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Nikon D3100 and the Sony A7S are of equal size. However, the A7S is slightly lighter (3 percent) than the D3100. It is noteworthy in this context that the A7S 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 (A7S). Mirrorless cameras, such as the A7S, 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 A7S can take 380 images on a single charge of its NP-FW50 power pack. The power pack in the A7S can be charged via the USB port, which can be very convenient when travelling.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Nikon D3100 124 mm 96 mm 75 mm 505 g 550 n Aug 2010 599i
2.
 
Sony A7S 127 mm 94 mm 48 mm 489 g 380 Y Apr 2014 2,499i
3.
 
Nikon Df 144 mm 110 mm 67 mm 760 g 1400 Y Nov 2013 2,749i
4.
 
Nikon D3200 125 mm 96 mm 77 mm 505 g 540 n Apr 2012 599i
5.
 
Nikon D5100 128 mm 97 mm 79 mm 560 g 660 n Apr 2011 749i
6.
 
Nikon D7000 132 mm 105 mm 77 mm 780 g 1050 Y Sep 2010 1,499i
7.
 
Nikon D3000 126 mm 97 mm 64 mm 536 g 500 n Jul 2009 599i
8.
 
Nikon D5000 127 mm 104 mm 80 mm 590 g 510 n Apr 2009 749i
9.
 
Nikon D60 126 mm 94 mm 64 mm 522 g 500 n Jan 2008 629i
10.
 
Nikon D40X 124 mm 94 mm 64 mm 522 g 520 n Mar 2007 729i
11.
 
Nikon D40 124 mm 94 mm 64 mm 522 g 470 n Nov 2006 499i
12.
 
Sony A7S II 127 mm 96 mm 60 mm 627 g 370 Y Sep 2015 2,999i
13.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999i
14.
 
Sony A7 127 mm 94 mm 48 mm 474 g 340 Y Oct 2013 1,699i
15.
 
Sony A7R 127 mm 94 mm 48 mm 465 g 340 Y Oct 2013 2,299i
16.
 
Sony NEX-5N 111 mm 59 mm 38 mm 269 g 460 n Aug 2011 699i
17.
 
Sony NEX-C3 110 mm 60 mm 33 mm 225 g 400 n Jun 2011 599i
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 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 76 percent) than the A7S, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

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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. 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Nikon D3100 features an APS-C sensor and the Sony A7S a full frame sensor. The sensor area in the A7S is 140 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.

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

Nikon D3100 and Sony A7S sensor measures

Despite having a smaller sensor, the Nikon D3100 offers a higher resolution of 14.2 megapixels, compared with 12 MP of the Sony A7S. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 5.01μm versus 8.45μm for the A7S). Moreover, it should be noted that the A7S is much more recent (by 3 years and 7 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 Nikon D3100 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the D3100 for good quality output (200 dots per inch) amounts to 23 x 15.4 inches or 58.5 x 39 cm, for very good quality (250 dpi) 18.4 x 12.3 inches or 46.8 x 31.2 cm, and for excellent quality (300 dpi) 15.4 x 10.2 inches or 39 x 26 cm. The corresponding values for the Sony A7S are 21.2 x 14.2 inches or 53.8 x 36 cm for good quality, 17 x 11.3 inches or 43.1 x 28.8 cm for very good quality, and 14.1 x 9.4 inches or 35.9 x 24 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 Sony Alpha A7S are ISO 100 to ISO 102400, with the possibility to increase the ISO range to 50-409600.

D3100 versus A7S MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under consideration, the A7S offers substantially better image quality than the D3100 (overall score 20 points higher). The advantage is based on 1.4 bits higher color depth, 1.9 EV in additional dynamic range, and 2 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.

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Sensor Characteristics
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Nikon D3100 APS-C 14.2 4608 30721080/24p22.511.391967
2.
 
Sony A7S Full Frame 12.0 4240 28321080/60p23.913.2370287
3.
 
Nikon Df Full Frame 16.2 4928 3280none24.613.1327989
4.
 
Nikon D3200 APS-C 24.1 6016 40001080/30p24.113.2113181
5.
 
Nikon D5100 APS-C 16.1 4928 32641080/30p23.513.6118380
6.
 
Nikon D7000 APS-C 16.1 4928 32641080/24p23.513.9116780
7.
 
Nikon D3000 APS-C 10.0 3872 2592none22.311.156362
8.
 
Nikon D5000 APS-C 12.2 4288 2848720/24p22.712.586872
9.
 
Nikon D60 APS-C 10.0 3872 2592none22.511.456265
10.
 
Nikon D40X APS-C 10.0 3872 2592none22.411.451663
11.
 
Nikon D40 APS-C 6.0 3008 2000none21.011.056156
12.
 
Sony A7S II Full Frame 12.0 4240 28324K/30p23.613.3299385
13.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
14.
 
Sony A7 Full Frame 24.0 6000 40001080/60p24.814.2224890
15.
 
Sony A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
16.
 
Sony NEX-5N APS-C 16.0 4912 32641080/60i23.612.7107977
17.
 
Sony NEX-C3 APS-C 16.0 4912 3264720/30p22.712.2108373

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the A7S provides a faster frame rate than the D3100. It can shoot movie footage at 1080/60p, while the Nikon is limited to 1080/24p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the A7S has an electronic viewfinder (2400k 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 A7S 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 A7S has a higher magnification (0.71x vs 0.53x), 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 Nikon D3100 and Sony A7S along with similar information for a selection of comparators.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Nikon D3100optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
2.
 
Sony A7S2400 n3.0 / 921 tilting n 1/8000s 5.0/s n n
3.
 
Nikon Dfoptical Y3.2 / 921 fixed n 1/4000s 5.5/s n n
4.
 
Nikon D3200optical n3.0 / 921 fixed n 1/4000s 4.0/s Y n
5.
 
Nikon D5100optical n3.0 / 921 swivel n 1/4000s 4.0/s Y n
6.
 
Nikon D7000optical Y3.0 / 921 fixed n 1/8000s 6.0/s Y n
7.
 
Nikon D3000optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
8.
 
Nikon D5000optical n2.7 / 230 full-flex n 1/4000s 4.0/s Y n
9.
 
Nikon D60optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
10.
 
Nikon D40Xoptical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
11.
 
Nikon D40optical n2.5 / 230 fixed n 1/4000s 2.5/s Y n
12.
 
Sony A7S II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
13.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
14.
 
Sony A72400 n3.0 / 1230 tilting n 1/8000s 5.0/s n n
15.
 
Sony A7R2400 n3.0 / 1230 tilting n 1/8000s 4.0/s n n
16.
 
Sony NEX-5Noptional n3.0 / 920 tilting Y 1/4000s 10.0/s n n
17.
 
Sony NEX-C3optional n3.0 / 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 A7S 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 A7S 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 D3100 writes its imaging data to SDXC cards, while the A7S uses SDXC or Memory Stick PRO Duo cards. The A7S supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the D3100 cannot take advantage of Ultra High Speed SD cards.

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 Nikon D3100 and Sony Alpha A7S and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
    Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Nikon D3100Ymono / mono--mini2.0---
2.
 
Sony A7SYstereo / monoYYmicro2.0YY-
3.
 
Nikon DfY- / ---mini2.0---
4.
 
Nikon D3200Ymono / monoY-mini2.0---
5.
 
Nikon D5100Ymono / monoY-mini2.0---
6.
 
Nikon D7000Ymono / monoY-mini2.0---
7.
 
Nikon D3000Y- / ----2.0---
8.
 
Nikon D5000Ymono / mono--mini2.0---
9.
 
Nikon D60Y- / ----2.0---
10.
 
Nikon D40XY- / ----2.0---
11.
 
Nikon D40Y- / ----2.0---
12.
 
Sony A7S IIYstereo / monoYYmicro2.0YY-
13.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-
14.
 
Sony A7Ystereo / monoYYmicro2.0YY-
15.
 
Sony A7RYstereo / monoYYmicro2.0YY-
16.
 
Sony NEX-5NYstereo / mono--mini2.0---
17.
 
Sony NEX-C3Ystereo / mono--mini2.0---

It is notable that the A7S 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.

Both the D3100 and the A7S have been discontinued, but can regularly be found used on eBay. The D3100 was replaced by the Nikon D3200, while the A7S was followed by the Sony A7S II. 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.

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Review summary

So what conclusions can be drawn? Is the Nikon D3100 better than the Sony A7S or vice versa? The listing below highlights the relative strengths of the two models.

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Advantages of the Nikon D3100:

  • More detail: Offers more megapixels (14.2 vs 12MP) with a 9% higher linear resolution.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Longer lasting: Can take more shots (550 versus 380) on a single battery charge.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced category (76 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in August 2010).

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Arguments in favor of the Sony Alpha A7S:

  • Better image quality: Scores substantially higher (20 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.4 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (1.9 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (2 stops ISO advantage).
  • Better video: Provides higher movie framerates (1080/60p versus 1080/24p).
  • 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 (0.71x vs 0.53x).
  • More detailed LCD: Has a higher resolution rear screen (921k vs 230k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (5 vs 3 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
  • More modern: Reflects 3 years and 7 months of technical progress since the D3100 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the A7S is the clear winner of the contest (22 : 6 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 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.

D3100 06:22 A7S

How about other alternatives? Do the specifications of the Nikon D3100 and the Sony A7S 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 technical specifications can provide a useful overview of the capabilities of different cameras, it remains incomplete and does no justice, for example, to the way the D3100 or the A7S 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.

Expert reviews

This is why expert reviews are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

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Expert Camera Reviews
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Nikon D31005/5+ +..72/1004.5/54.5/5 Aug 2010 599i
2.
 
Sony A7S4/5....86/1004.5/55/5 Apr 2014 2,499i
3.
 
Nikon Df4/5....81/1004/54/5 Nov 2013 2,749i
4.
 
Nikon D32005/5+ +..73/1004.5/54.5/5 Apr 2012 599i
5.
 
Nikon D51005/5+ +..76/1004.5/54.5/5 Apr 2011 749i
6.
 
Nikon D70004/5....80/1004.5/54.5/5 Sep 2010 1,499i
7.
 
Nikon D3000..+..72/1004/54.5/5 Jul 2009 599i
8.
 
Nikon D5000..+ +..75/1004/54.5/5 Apr 2009 749i
9.
 
Nikon D60..80/100..+ +4/54.5/5 Jan 2008 629i
10.
 
Nikon D40X..79/100..+ +4/54/5 Mar 2007 729i
11.
 
Nikon D40..81/100..+ +o4.5/5 Nov 2006 499i
12.
 
Sony A7S II5/5+....4.5/55/5 Sep 2015 2,999i
13.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999i
14.
 
Sony A75/5+ +..80/1005/55/5 Oct 2013 1,699i
15.
 
Sony A7R5/5+ +..82/1004.5/55/5 Oct 2013 2,299i
16.
 
Sony NEX-5N3/5+ +..79/1004.5/54.5/5 Aug 2011 699i
17.
 
Sony NEX-C33/5+ +..74/1004.5/54/5 Jun 2011 599i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated with care, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

Nikon D3100:
Check current offers at
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Sony A7S:
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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 use the search menu 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: Nikon D3100 vs Sony A7S

    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 Nikon D3100 Sony A7S
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Nikon F mount lenses Sony E mount lenses
    Launch Date August 2010 April 2014
    Launch Price USD 599 USD 2,499
    Sensor Specs Nikon D3100 Sony A7S
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.1 x 15.4 mm 35.8 x 23.9 mm
    Sensor Area 355.74 mm2 855.62 mm2
    Sensor Diagonal 27.8 mm 43 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 14.2 Megapixels 12 Megapixels
    Image Resolution 4608 x 3072 pixels 4240 x 2832 pixels
    Pixel Pitch 5.01 μm 8.45 μm
    Pixel Density 3.98 MP/cm2 1.40 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 1080/24p Video 1080/60p Video
    ISO Setting 100 - 3,200 ISO 100 - 102,400 ISO
    ISO Boost 100 - 12,800 ISO 50 - 409,600 ISO
    Image Processor EXPEED 2 BIONZ X
    DXO Sensor Quality (score) 67 87
    DXO Color Depth (bits) 22.5 23.9
    DXO Dynamic Range (EV) 11.3 13.2
    DXO Low Light (ISO) 919 3702
    Screen Specs Nikon D3100 Sony A7S
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 95% 100%
    Viewfinder Magnification 0.53x 0.71x
    Viewfinder Resolution 2400k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 230k dots 921k dots
    LCD Attachment Fixed screen Tilting screen
    Shooting Specs Nikon D3100 Sony A7S
    Focus System Phase-detect AF Contrast-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 3 shutter flaps/s 5 shutter flaps/s
    Electronic Shutterno E-ShutterYES
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium SDXC cards MS or SDXC cards
    Second Storage Option Single card slot Single card slot
    UHS card support no UHS-I
    Connectivity Specs Nikon D3100 Sony A7S
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    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
    Body Specs Nikon D3100 Sony A7S
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type EN-EL14 NP-FW50
    Battery Life (CIPA)550 shots per charge380 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 124 x 96 x 75 mm
    (4.9 x 3.8 x 3.0 in)
    127 x 94 x 48 mm
    (5.0 x 3.7 x 1.9 in)
    Camera Weight 505 g (17.8 oz) 489 g (17.2 oz)
    Nikon D3100:
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    Sony A7S:
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