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Nikon D3100 vs Sony A77

The Nikon D3100 and the Sony Alpha SLT-A77 are two digital cameras that were officially introduced, respectively, in August 2010 and August 2011. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C 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.

Headline Specifications
Nikon D3100
versus
Sony A77
Nikon D3100   Sony A77
Digital single lens reflex Digital single lens reflex
Nikon F mount lenses Sony A mount lenses
14.2 MP – APS-C sensor 24 MP – APS-C sensor
1080/24p Video 1080/60p Video
ISO 100-3,200 (100 - 12,800) ISO 100-16,000 (50 - 25,600)
Optical viewfinder Electronic viewfinder (2359k dots)
3.0" LCD – 230k dots 3.0" LCD – 921k dots
Fixed screen (not touch-sensitive) Fully flexible screen (no touchscreen)
3 shutter flaps per second 12 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
550 shots per battery charge470 shots per battery charge
124 x 96 x 75 mm, 505 g 143 x 104 x 81 mm, 732 g
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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 SLT-A77? 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 side-by-side display below illustrates the physical size and weight of the Nikon D3100 and the Sony A77. 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 measures are rounded to the nearest millimeter.

The D3100 can be obtained in two different colors (black, red), while the A77 is only available in black.

Size Nikon D3100 vs Sony A77
Compare D3100 versus A77 top
Comparison D3100 or A77 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A77 is notably larger (25 percent) than the Nikon D3100. Moreover, the A77 is substantially heavier (45 percent) than the D3100. It is noteworthy in this context that the A77 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.

Concerning battery life, the D3100 gets 550 shots out of its EN-EL14 battery, while the A77 can take 470 images on a single charge of its NP-FM500H power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons 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 599ebay.com
2.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 1,399ebay.com
3.
 
Nikon D3200 125 mm 96 mm 77 mm 505 g 540 n Apr 2012 599ebay.com
4.
 
Nikon D5100 128 mm 97 mm 79 mm 560 g 660 n Apr 2011 749ebay.com
5.
 
Nikon D7000 132 mm 105 mm 77 mm 780 g 1050 Y Sep 2010 1,499ebay.com
6.
 
Nikon D3000 126 mm 97 mm 64 mm 536 g 500 n Jul 2009 599ebay.com
7.
 
Nikon D5000 127 mm 104 mm 80 mm 590 g 510 n Apr 2009 749ebay.com
8.
 
Nikon D60 126 mm 94 mm 64 mm 522 g 500 n Jan 2008 629ebay.com
9.
 
Nikon D40X 124 mm 94 mm 64 mm 522 g 520 n Mar 2007 729ebay.com
10.
 
Nikon D40 124 mm 94 mm 64 mm 522 g 470 n Nov 2006 499ebay.com
11.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299ebay.com
12.
 
Sony A6500 120 mm 67 mm 53 mm 453 g 350 Y Oct 2016 1,399ebay.com
13.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999ebay.com
14.
 
Sony A77 II 143 mm 104 mm 81 mm 647 g 480 Y May 2014 1,199ebay.com
15.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 2,799ebay.com
16.
 
Sony NEX-5N 111 mm 59 mm 38 mm 269 g 460 n Aug 2011 699ebay.com
17.
 
Sony NEX-C3 110 mm 60 mm 33 mm 225 g 400 n Jun 2011 599ebay.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 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 57 percent) than the A77, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down.

Sensor comparison

The 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. 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the A77 is 3 percent bigger. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Nikon D3100 and Sony A77 sensor measures

With 24MP, the A77 offers a higher resolution than the D3100 (14.2MP), but the A77 has smaller individual pixels (pixel pitch of 3.91μm versus 5.01μm for the D3100). Yet, the A77 is a somewhat more recent model (by 1 year) than the D3100, and its sensor might have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.

The resolution advantage of the Sony A77 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A77 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 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 SLT-A77 are ISO 100 to ISO 16000, with the possibility to increase the ISO range to 50-25600.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

D3100 versus A77 MP

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 A77 offers substantially better image quality than the D3100 (overall score 11 points higher). The advantage is based on 1.5 bits higher color depth, 1.9 EV in additional dynamic range, and 0.2 stops of reduced low light sensitivity. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar 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 A77 APS-C 24.0 6000 40001080/60p24.013.280178
3.
 
Nikon D3200 APS-C 24.1 6016 40001080/30p24.113.2113181
4.
 
Nikon D5100 APS-C 16.1 4928 32641080/30p23.513.6118380
5.
 
Nikon D7000 APS-C 16.1 4928 32641080/24p23.513.9116780
6.
 
Nikon D3000 APS-C 10.0 3872 2592none22.311.156362
7.
 
Nikon D5000 APS-C 12.2 4288 2848720/24p22.712.586872
8.
 
Nikon D60 APS-C 10.0 3872 2592none22.511.456265
9.
 
Nikon D40X APS-C 10.0 3872 2592none22.411.451663
10.
 
Nikon D40 APS-C 6.0 3008 2000none21.011.056156
11.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
12.
 
Sony A6500 APS-C 24.0 6000 40004K/30p24.513.7140585
13.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
14.
 
Sony A77 II APS-C 24.0 6000 40001080/60p23.512.7144277
15.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589
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
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the A77 provides a faster frame rate than the D3100. It can shoot movie footage at 1080/60p, while the Nikon is limited to 1080/24p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the A77 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 A77 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 A77 has a higher magnification (0.73x 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 A77 in connection with corresponding information for a sample of similar cameras.

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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 A772359 Y3.0 / 921 full-flex n 1/8000s 12.0/s Y Y
3.
 
Nikon D3200optical n3.0 / 921 fixed n 1/4000s 4.0/s Y n
4.
 
Nikon D5100optical n3.0 / 921 swivel n 1/4000s 4.0/s Y n
5.
 
Nikon D7000optical Y3.0 / 921 fixed n 1/8000s 6.0/s Y n
6.
 
Nikon D3000optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
7.
 
Nikon D5000optical n2.7 / 230 full-flex n 1/4000s 4.0/s Y n
8.
 
Nikon D60optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
9.
 
Nikon D40Xoptical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
10.
 
Nikon D40optical n2.5 / 230 fixed n 1/4000s 2.5/s Y n
11.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
12.
 
Sony A65002359 n3.0 / 922 tilting Y 1/4000s 11.0/s Y Y
13.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
14.
 
Sony A77 II2359 Y3.0 / 1229 full-flex n 1/8000s 12.0/s Y Y
15.
 
Sony A992359 Y3.0 / 1229 full-flex n 1/8000s 6.0/s n Y
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 feature that differentiates the A77 and the D3100 is in-body image stabilization (IBIS). The A77 reduces the risk of handshake-induced blur with all attached lenses, while the D3100 offers no blur reduction with lenses that themselves do not provide optical image stabilization.

The A77 has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the D3100 does not have a selfie-screen.

The D3100 writes its imaging data to SDXC cards, while the A77 uses SDXC or Memory Stick PRO Duo cards. The A77 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 SLT-A77 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 A77Ystereo / monoY-mini2.0---
3.
 
Nikon D3200Ymono / monoY-mini2.0---
4.
 
Nikon D5100Ymono / monoY-mini2.0---
5.
 
Nikon D7000Ymono / monoY-mini2.0---
6.
 
Nikon D3000Y- / ----2.0---
7.
 
Nikon D5000Ymono / mono--mini2.0---
8.
 
Nikon D60Y- / ----2.0---
9.
 
Nikon D40XY- / ----2.0---
10.
 
Nikon D40Y- / ----2.0---
11.
 
Pentax K-3Ymono / monoYYmini3.0---
12.
 
Sony A6500Ystereo / monoY-micro2.0YY-
13.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-
14.
 
Sony A77 IIYstereo / monoY-mini2.0YY-
15.
 
Sony A99Ystereo / monoYYmini2.0---
16.
 
Sony NEX-5NYstereo / mono--mini2.0---
17.
 
Sony NEX-C3Ystereo / mono--mini2.0---

It is notable that the A77 has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The D3100 does not feature such a mic input.

Studio photographers will appreciate that the Sony A77 (unlike the D3100) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Travel and landscape photographers will find it useful that the A77 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the D3100 and the A77 have been discontinued, but can regularly be found used on ebay. The D3100 was replaced by the Nikon D3200, while the A77 was followed by the Sony A77 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.

Review summary

So how do things add up? Is the Nikon D3100 better than the Sony A77 or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Reasons to prefer the Nikon D3100:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • More compact: Is smaller (124x96mm vs 143x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 227g or 31 percent) and hence easier to carry around.
  • Longer lasting: Can take more shots (550 versus 470) on a single battery charge.
  • More affordable: Was introduced into a lower priced category (57 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in August 2010).

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Advantages of the Sony Alpha SLT-A77:

  • More detail: Has more megapixels (24 vs 14.2MP), which boosts linear resolution by 30%.
  • Better image quality: Scores substantially higher (11 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.5 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (1.9 EV of extra DR).
  • Better video: Provides higher movie framerates (1080/60p versus 1080/24p).
  • Better sound: Can connect to an external microphone for higher quality sound 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 (0.73x 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).
  • More flexible LCD: Has a full-flex 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 shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 3 flaps/sec) to capture the decisive moment.
  • 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.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
  • More modern: Was introduced somewhat (1 year) more recently.

If the count of individual advantages (bullet points above) is taken as a guide, the A77 is the clear winner of the contest (21 : 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

D3100 06:21 A77

How about other alternatives? Do the specifications of the Nikon D3100 and the Sony A77 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the D3100 and the A77 in practical situations. 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.

Expert reviews

This is why expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular 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.

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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 599ebay.com
2.
 
Sony A775/591/100..81/100..5/5 Aug 2011 1,399ebay.com
3.
 
Nikon D32005/5+ +..73/1004.5/54.5/5 Apr 2012 599ebay.com
4.
 
Nikon D51005/5+ +..76/1004.5/54.5/5 Apr 2011 749ebay.com
5.
 
Nikon D70004/5....80/1004.5/54.5/5 Sep 2010 1,499ebay.com
6.
 
Nikon D3000..+..72/1004/54.5/5 Jul 2009 599ebay.com
7.
 
Nikon D5000..+ +..75/1004/54.5/5 Apr 2009 749ebay.com
8.
 
Nikon D60..80/100..+ +4/54.5/5 Jan 2008 629ebay.com
9.
 
Nikon D40X..79/100..+ +4/54/5 Mar 2007 729ebay.com
10.
 
Nikon D40..81/100..+ +o4.5/5 Nov 2006 499ebay.com
11.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299ebay.com
12.
 
Sony A65005/5+ +3.5/585/1004.5/54.5/5 Oct 2016 1,399ebay.com
13.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999ebay.com
14.
 
Sony A77 II4/5....80/1004.5/55/5 May 2014 1,199ebay.com
15.
 
Sony A995/5....84/1004.5/54.5/5 Sep 2012 2,799ebay.com
16.
 
Sony NEX-5N3/5+ +..79/1004.5/54.5/5 Aug 2011 699ebay.com
17.
 
Sony NEX-C33/5+ +..74/1004.5/54/5 Jun 2011 599ebay.com
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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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 make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Nikon D3100 vs Sony A77

    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 A77
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Nikon F mount lenses Sony A mount lenses
    Launch Date August 2010 August 2011
    Launch Price USD 599 USD 1,399
    Sensor Specs Nikon D3100 Sony A77
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor APS-C Sensor
    Sensor Size 23.1 x 15.4 mm 23.5 x 15.6 mm
    Sensor Area 355.74 mm2 366.6 mm2
    Sensor Diagonal 27.8 mm 28.2 mm
    Crop Factor 1.5x 1.5x
    Sensor Resolution 14.2 Megapixels 24 Megapixels
    Image Resolution 4608 x 3072 pixels 6000 x 4000 pixels
    Pixel Pitch 5.01 μm 3.91 μm
    Pixel Density 3.98 MP/cm2 6.55 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 - 16,000 ISO
    ISO Boost 100 - 12,800 ISO 50 - 25,600 ISO
    Image Processor EXPEED 2 BIONZ X
    DXO Sensor Quality (score) 67 78
    DXO Color Depth (bits) 22.5 24.0
    DXO Dynamic Range (EV) 11.3 13.2
    DXO Low Light (ISO) 919 801
    Screen Specs Nikon D3100 Sony A77
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 95% 100%
    Viewfinder Magnification 0.53x 0.73x
    Viewfinder Resolution 2359k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 230k dots 921k dots
    LCD Attachment Fixed screen Fully flexible screen
    Shooting Specs Nikon D3100 Sony A77
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 3 shutter flaps/s 12 shutter flaps/s
    Shutter Life Expectancy100 000 actuations150 000 actuations
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash Built-in 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 A77
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi no Wifi
    Geotagging no internal GPS GPS built-in
    Body Specs Nikon D3100 Sony A77
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type EN-EL14 NP-FM500H
    Battery Life (CIPA)550 shots per charge470 shots per charge
    Body Dimensions 124 x 96 x 75 mm
    (4.9 x 3.8 x 3.0 in)
    143 x 104 x 81 mm
    (5.6 x 4.1 x 3.2 in)
    Camera Weight 505 g (17.8 oz) 732 g (25.8 oz)
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