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Nikon D5100 vs Sony A99 II

The Nikon D5100 and the Sony Alpha ALT-A99 II are two digital cameras that were announced, respectively, in April 2011 and September 2016. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (D5100) and a full frame (A99 II) sensor. The Nikon has a resolution of 16.1 megapixels, whereas the Sony provides 42.2 MP.

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

Headline Specifications
Nikon D5100
versus
Sony A99 II
Nikon D5100   Sony A99 II
Digital single lens reflex Digital single lens reflex
Nikon F mount lenses Sony A mount lenses
16.1 MP, APS-C Sensor 42.2 MP, Full Frame Sensor
1080/30p Video 4K/30p Video
ISO 100-6,400 (100 - 25,600) ISO 100-25,600
Optical viewfinder Electronic viewfinder (2400k dots)
3.0 LCD, 921k dots 3.0 LCD, 1229k dots
Swivel screen (not touch-sensitive) Fully flexible screen (no touchscreen)
4 shutter flaps per second 12 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
660 shots per battery charge490 shots per battery charge
128 x 97 x 79 mm, 560 g 143 x 104 x 76 mm, 849 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D5100 and the Sony Alpha ALT-A99 II? 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 D5100 and the Sony A99 II. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

Size Nikon D5100 vs Sony A99 II
Compare D5100 versus A99 II top
Comparison D5100 or A99 II rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A99 II is notably larger (20 percent) than the Nikon D5100. Moreover, the A99 II is substantially heavier (52 percent) than the D5100. It is noteworthy in this context that the A99 II is splash and dust-proof, while the D5100 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 D5100 gets 660 shots out of its EN-EL14 battery, while the A99 II can take 490 images on a single charge of its NP-FM500H power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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 D5100 128 mm 97 mm 79 mm 560 g 660 n Apr 2011 749i
2.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 3,199 i
3.
 
Canon 5DS 152 mm 116 mm 76 mm 930 g 700 Y Feb 2015 3,699 i
4.
 
Canon G1 X 117 mm 81 mm 65 mm 534 g 250 n Jan 2012 799i
5.
 
Canon 550D 129 mm 98 mm 62 mm 530 g 440 n Feb 2010 699i
6.
 
Nikon D5600 124 mm 97 mm 70 mm 465 g 970 n Nov 2016 699 i
7.
 
Nikon D5500 124 mm 97 mm 70 mm 420 g 820 n Jan 2015 899i
8.
 
Nikon D5300 125 mm 98 mm 76 mm 480 g 600 n Oct 2013 799i
9.
 
Nikon D3200 125 mm 96 mm 77 mm 505 g 540 n Apr 2012 599i
10.
 
Nikon D5200 129 mm 98 mm 78 mm 555 g 500 n Nov 2012 749i
11.
 
Nikon D7000 132 mm 105 mm 77 mm 780 g 1050 Y Sep 2010 1,499i
12.
 
Nikon D3100 124 mm 96 mm 75 mm 505 g 550 n Aug 2010 599i
13.
 
Nikon D5000 127 mm 104 mm 80 mm 590 g 510 n Apr 2009 749i
14.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199i
15.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 3,199i
16.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 2,799i
17.
 
Sony A900 156 mm 117 mm 82 mm 895 g 880 Y Sep 2008 2,999i
Notes: 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 retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The D5100 was launched at a markedly lower price (by 77 percent) than the A99 II, 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.

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. 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 D5100 features an APS-C sensor and the Sony A99 II a full frame sensor. The sensor area in the A99 II is 132 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.

Nikon D5100 and Sony A99 II sensor measures

With 42.2MP, the A99 II offers a higher resolution than the D5100 (16.1MP), but the A99 II has smaller individual pixels (pixel pitch of 4.52μm versus 4.80μm for the D5100). Yet, the A99 II is a much more recent model (by 5 years and 5 months) than the D5100, and its sensor will 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 A99 II has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Sony A99 II implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A99 II for good quality output (200 dots per inch) amounts to 39.8 x 26.5 inches or 101 x 67.4 cm, for very good quality (250 dpi) 31.8 x 21.2 inches or 80.8 x 53.9 cm, and for excellent quality (300 dpi) 26.5 x 17.7 inches or 67.3 x 44.9 cm. The corresponding values for the Nikon D5100 are 24.6 x 16.3 inches or 62.6 x 41.5 cm for good quality, 19.7 x 13.1 inches or 50.1 x 33.2 cm for very good quality, and 16.4 x 10.9 inches or 41.7 x 27.6 cm for excellent quality prints.

The A99 II has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Nikon D5100 has a native sensitivity range from ISO 100 to ISO 6400, which can be extended to ISO 100-25600. The corresponding ISO settings for the Sony Alpha ALT-A99 II are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-25600.

D5100 versus A99 II MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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 A99 II offers substantially better image quality than the D5100 (overall score 12 points higher). The advantage is based on 1.9 bits higher color depth, 0.2 EV of lower dynamic range, and 1 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.

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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 D5100 APS-C 16.1 4928 32641080/30p23.513.6118380
2.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792
3.
 
Canon 5DS Full Frame 50.3 8688 57921080/30p24.712.4238187
4.
 
Canon G1 X 1.5-inch 14.2 4352 32641080/24p21.710.864460
5.
 
Canon 550D APS-C 17.9 5184 34561080/30p22.111.578466
6.
 
Nikon D5600 APS-C 24.0 6000 40001080/60p24.114.0130684
7.
 
Nikon D5500 APS-C 24.0 6000 40001080/60p24.114.0143884
8.
 
Nikon D5300 APS-C 24.0 6000 40001080/60p24.013.9133883
9.
 
Nikon D3200 APS-C 24.1 6016 40001080/30p24.113.2113181
10.
 
Nikon D5200 APS-C 24.0 6000 40001080/60i24.213.9128484
11.
 
Nikon D7000 APS-C 16.1 4928 32641080/24p23.513.9116780
12.
 
Nikon D3100 APS-C 14.2 4608 30721080/24p22.511.391967
13.
 
Nikon D5000 APS-C 12.2 4288 2848720/24p22.712.586872
14.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
15.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498
16.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589
17.
 
Sony A900 Full Frame 24.4 6048 4032none23.712.3143179

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 A99 II provides a better video resolution than the D5100. It can shoot movie footage at 4K/30p, while the Nikon is limited to 1080/30p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the A99 II has an electronic viewfinder (2400k dots), while the D5100 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 A99 II offers a wider field of view (100%) than the one in the D5100 (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the A99 II has a higher magnification (0.78x vs 0.51x), 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 D5100 and Sony A99 II 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)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Nikon D5100optical n3.0 / 921 swivel n 1/4000s 4.0 Y n
2.
 
Sony A99 II2400 Y3.0 / 1229 full-flex n 1/8000s 12.0 n Y
3.
 
Canon 5DSoptical Y3.2 / 1040 fixed n 1/8000s 5.0 n n
4.
 
Canon G1 Xoptical n3.0 / 922 swivel n 1/4000s 1.9 Y Y
5.
 
Canon 550Doptical n3.0 / 1040 fixed n 1/4000s 3.7 Y n
6.
 
Nikon D5600optical n3.2 / 1037 swivel Y 1/4000s 5.0 Y n
7.
 
Nikon D5500optical n3.2 / 1037 swivel Y 1/4000s 5.0 Y n
8.
 
Nikon D5300optical n3.2 / 1037 swivel n 1/4000s 5.0 Y n
9.
 
Nikon D3200optical n3.0 / 921 fixed n 1/4000s 4.0 Y n
10.
 
Nikon D5200optical n3.0 / 921 swivel n 1/4000s 5.0 Y n
11.
 
Nikon D7000optical Y3.0 / 921 fixed n 1/8000s 6.0 Y n
12.
 
Nikon D3100optical n3.0 / 230 fixed n 1/4000s 3.0 Y n
13.
 
Nikon D5000optical n2.7 / 230 full-flex n 1/4000s 4.0 Y n
14.
 
Sony A7R III3686 n3.0 / 1440 tilting Y 1/8000s 10.0 n Y
15.
 
Sony A7R II2400 n3.0 / 1229 tilting n 1/8000s 5.0 n Y
16.
 
Sony A992359 Y3.0 / 1229 full-flex n 1/8000s 6.0 n Y
17.
 
Sony A900optical Y3.0 / 922 fixed n 1/8000s 5.0 n Y

One difference between the cameras concerns the presence of an on-board flash. The D5100 has one, while the A99 II does not. While the built-in flash of the D5100 is not very powerful, it can at times be useful as a fill-in light.

Both cameras have an articulated rear screen that can be turned to be front-facing. This feature will be particularly appreciated by vloggers and photographers who are interested in taking selfies.

The Nikon D5100 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 D5100 writes its imaging data to SDXC cards, while the A99 II uses SDXC or Memory Stick PRO Duo cards. The A99 II features dual card slots, which can be very useful in case a memory card fails. In contrast, the D5100 only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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 D5100 and Sony Alpha ALT-A99 II 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 D5100Ymono / monoY-mini2.0---
2.
 
Sony A99 IIYstereo / monoYYmicro2.0YYY
3.
 
Canon 5DSYmono / monoY-mini3.0---
4.
 
Canon G1 XYstereo / mono--mini2.0---
5.
 
Canon 550DYstereo / -Y-mini2.0---
6.
 
Nikon D5600Ystereo / monoY-mini2.0YYY
7.
 
Nikon D5500Ystereo / monoY-mini2.0Y--
8.
 
Nikon D5300Ystereo / monoY-mini2.0Y--
9.
 
Nikon D3200Ymono / monoY-mini2.0---
10.
 
Nikon D5200Ystereo / monoY-mini2.0---
11.
 
Nikon D7000Ymono / monoY-mini2.0---
12.
 
Nikon D3100Ymono / mono--mini2.0---
13.
 
Nikon D5000Ymono / mono--mini2.0---
14.
 
Sony A7R IIIYstereo / monoYYmicro3.1YYY
15.
 
Sony A7R IIYstereo / monoYYmicro2.0YY-
16.
 
Sony A99Ystereo / monoYYmini2.0---
17.
 
Sony A900Y- / ---mini2.0---

It is notable that the A99 II offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the D5100 does not provide wifi capability.

Studio photographers will appreciate that the Sony A99 II (unlike the D5100) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The A99 II is a recent model that features in the current product line-up of Sony. In contrast, the D5100 has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the D5100 was succeeded by the Nikon D5200. 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 what is the bottom line? Which of the two cameras – the Nikon D5100 or the Sony A99 II – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Nikon D5100:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • More compact: Is smaller (128x97mm vs 143x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 289g or 34 percent) and hence easier to carry around.
  • Longer lasting: Can take more shots (660 versus 490) 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 (77 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in April 2011).

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Advantages of the Sony Alpha ALT-A99 II:

  • More detail: Has more megapixels (42.2 vs 16.1MP), which boosts linear resolution by 62%.
  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • Better image quality: Scores substantially higher (12 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.9 bits more color depth).
  • Better low-light sensitivity: Can shoot in dim conditions (1 stops ISO advantage).
  • Better video: Provides higher definition movie capture (4K/30p vs 1080/30p).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • 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 0.51x).
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 921k dots).
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 4 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 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.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More modern: Reflects 5 years and 5 months of technical progress since the D5100 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the A99 II is the clear winner of the contest (23 : 9 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.

D5100 09:23 A99 II

How about other alternatives? Do the specifications of the Nikon D5100 and the Sony A99 II 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 says little about, for example, the shooting experience and imaging performance of the D5100 and the A99 II 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 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.

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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 D51005/5+ +..76/1004.5/54.5/5 Apr 2011 749i
2.
 
Sony A99 II....4.5/585/1004.5/54.5/5 Sep 2016 3,199 i
3.
 
Canon 5DS..+..83/1004.5/54.5/5 Feb 2015 3,699 i
4.
 
Canon G1 X5/5+..76/1004/54.5/5 Jan 2012 799i
5.
 
Canon 550D..+ +..77/1004/54.5/5 Feb 2010 699i
6.
 
Nikon D56004/5..4/579/1004.5/54/5 Nov 2016 699 i
7.
 
Nikon D55005/5+..79/1004.5/54.5/5 Jan 2015 899i
8.
 
Nikon D53004/5+ +..79/1004.5/54.5/5 Oct 2013 799i
9.
 
Nikon D32005/5+ +..73/1004.5/54.5/5 Apr 2012 599i
10.
 
Nikon D52004/5+ +..79/1004.5/54.5/5 Nov 2012 749i
11.
 
Nikon D70004/5....80/1004.5/54.5/5 Sep 2010 1,499i
12.
 
Nikon D31005/5+ +..72/1004.5/54.5/5 Aug 2010 599i
13.
 
Nikon D5000..+ +..75/1004/54.5/5 Apr 2009 749i
14.
 
Sony A7R III..+ +4/590/1004.5/55/5 Oct 2017 3,199i
15.
 
Sony A7R II5/5+ +5/590/1005/55/5 Jun 2015 3,199i
16.
 
Sony A995/5....84/1004.5/54.5/5 Sep 2012 2,799i
17.
 
Sony A900..+ +..+ +4.5/55/5 Sep 2008 2,999i
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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Nikon D5100:
Check Ebay offers
Sony A99 II:
Check Amazon price

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.

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    Specifications: Nikon D5100 vs Sony A99 II

    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 D5100 Sony A99 II
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Nikon F mount lenses Sony A mount lenses
    Launch Date April 2011 September 2016
    Launch Price USD 749 USD 3,199
    Sensor Specs Nikon D5100 Sony A99 II
    Sensor Technology CMOS BSI-CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.6 x 15.7 mm 35.9 x 24.0 mm
    Sensor Area 370.52 mm2 861.6 mm2
    Sensor Diagonal 28.3 mm 43.2 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 16.1 Megapixels 42.2 Megapixels
    Image Resolution 4928 x 3264 pixels 7952 x 5304 pixels
    Pixel Pitch 4.80 μm 4.52 μm
    Pixel Density 4.34 MP/cm2 4.90 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability 1080/30p Video 4K/30p Video
    ISO Setting 100 - 6,400 ISO 100 - 25,600 ISO
    ISO Boost 100 - 25,600 ISO 50 - 25,600 ISO
    Image Processor EXPEED 2 BIONZ X
    DXO Sensor Quality (score) 80 92
    DXO Color Depth (bits) 23.5 25.4
    DXO Dynamic Range (EV) 13.6 13.4
    DXO Low Light (ISO) 1183 2317
    Screen Specs Nikon D5100 Sony A99 II
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 95% 100%
    Viewfinder Magnification 0.51x 0.78x
    Viewfinder Resolution 2400k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 921k dots 1229k dots
    LCD Attachment Swivel screen Fully flexible screen
    Shooting Specs Nikon D5100 Sony A99 II
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 4 shutter flaps/s 12 shutter flaps/s
    Shutter Life Expectancy100 000 actuations300 000 actuations
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationLens stabilization onlyIn-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 UHS-I UHS-I
    Connectivity Specs Nikon D5100 Sony A99 II
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI micro HDMI
    Microphone Port External MIC port 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 D5100 Sony A99 II
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type EN-EL14 NP-FM500H
    Battery Life (CIPA)660 shots per charge490 shots per charge
    Body Dimensions 128 x 97 x 79 mm
    (5.0 x 3.8 x 3.1 in)
    143 x 104 x 76 mm
    (5.6 x 4.1 x 3.0 in)
    Camera Weight 560 g (19.8 oz) 849 g (29.9 oz)

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