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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   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 100-6400 (100-25600) ISO 100-25600
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, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

Camera Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Nikon D5100» 5.0 in 3.8 in 3.1 in 19.8 oz 660 n Apr 2011 749- i Nikon D5100
 
Sony A99 II« 5.6 in 4.1 in 3.0 in 29.9 oz 490 Y Sep 2016 3,199 i i Sony A99 II
 
Canon 5DS R« » 6.0 in 4.6 in 3.0 in 32.8 oz 700 Y Feb 2015 3,699 i i Canon 5DS R
 
Canon T2i« » 5.1 in 3.9 in 2.4 in 18.7 oz 440 n Feb 2010 699- i Canon T2i
 
Nikon D850« » 5.7 in 4.9 in 3.1 in 35.5 oz 1840 Y Jul 2017 3,299 i i Nikon D850
 
Nikon D5600« » 4.9 in 3.8 in 2.8 in 16.4 oz 970 n Nov 2016 699 i i Nikon D5600
 
Nikon D5300« » 4.9 in 3.9 in 3.0 in 16.9 oz 600 n Oct 2013 799- i Nikon D5300
 
Nikon D3200« » 4.9 in 3.8 in 3.0 in 17.8 oz 540 n Apr 2012 599- i Nikon D3200
 
Nikon D5200« » 5.1 in 3.9 in 3.1 in 19.6 oz 500 n Nov 2012 749- i Nikon D5200
 
Nikon D7000« » 5.2 in 4.1 in 3.0 in 27.5 oz 1050 Y Sep 2010 1,499- i Nikon D7000
 
Nikon D3100« » 4.9 in 3.8 in 3.0 in 17.8 oz 550 n Aug 2010 599- i Nikon D3100
 
Nikon D5000« » 5.0 in 4.1 in 3.1 in 20.8 oz 510 n Apr 2009 749- i Nikon D5000
 
Sony A7R II« » 5.0 in 3.8 in 2.4 in 22.0 oz 290 Y Jun 2015 3,199- i Sony A7R II
 
Sony A7S II« » 5.0 in 3.8 in 2.4 in 22.1 oz 370 Y Sep 2015 2,999 i i Sony A7S II
 
Sony A99« » 5.8 in 4.4 in 3.1 in 28.6 oz 500 Y Sep 2012 2,799- i Sony A99
 
Sony NEX-5R« » 4.4 in 2.3 in 1.5 in 9.7 oz 330 n Aug 2012 749- i Sony NEX-5R
 
Sony NEX-5N« » 4.4 in 2.3 in 1.5 in 9.5 oz 460 n Aug 2011 699- i Sony NEX-5N
Note: Measurements and pricing do not include easily detachable parts, such as 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 inch or 101 x 67.4 cm, for very good quality (250 dpi) 31.8 x 21.2 inch or 80.8 x 53.9 cm, and for excellent quality (300 dpi) 26.5 x 17.7 inch or 67.3 x 44.9 cm. The corresponding values for the Nikon D5100 are 24.6 x 16.3 inch or 62.6 x 41.5 cm for good quality, 19.7 x 13.1 inch or 50.1 x 33.2 cm for very good quality, and 16.4 x 10.9 inch 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.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
 
Nikon D5100» APS-C 16.1 4928 32641080/30p23.513.6118380Nikon D5100
 
Sony A99 II« Full Frame 42.2 7952 53044K/30p25.413.4231792Sony A99 II
 
Canon 5DS R« » Full Frame 50.3 8688 57921080/30p24.612.4230886Canon 5DS R
 
Canon T2i« » APS-C 17.9 5184 34561080/30p22.111.578466Canon T2i
 
Nikon D850« » Full Frame 45.4 8256 55044K/30p26.414.82660100Nikon D850
 
Nikon D5600« » APS-C 24.0 6000 40001080/60p24.114.0130684Nikon D5600
 
Nikon D5300« » APS-C 24.0 6000 40001080/60p24.013.9133883Nikon D5300
 
Nikon D3200« » APS-C 24.1 6016 40001080/30p24.113.2113181Nikon D3200
 
Nikon D5200« » APS-C 24.0 6000 40001080/60i24.213.9128484Nikon D5200
 
Nikon D7000« » APS-C 16.1 4928 326410800/24p23.513.9116780Nikon D7000
 
Nikon D3100« » APS-C 14.2 4608 30721080/24p22.511.391967Nikon D3100
 
Nikon D5000« » APS-C 12.2 4288 2848720/24p22.712.586872Nikon D5000
 
Sony A7R II« » Full Frame 42.2 7952 53044K/30p26.013.9343498Sony A7R II
 
Sony A7S II« » Full Frame 12.0 4240 28324K/30p23.613.3299385Sony A7S II
 
Sony A99« » Full Frame 24.0 6000 40001080/60p25.014.0155589Sony A99
 
Sony NEX-5R« » APS-C 16.0 4912 32641080/60i23.713.191078Sony NEX-5R
 
Sony NEX-5N« » APS-C 16.0 4912 32641080/60i23.612.7107977Sony NEX-5N

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.

Core Features
  Camera
Model
Viewfinder
(Type or
'000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
('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
Camera
Model
 
Nikon D5100»optical n 3.0 921 swivel n 1/4000s 4.0 Y n Nikon D5100
 
Sony A99 II«2400 Y 3.0 1229 full-flex n 1/8000s 12.0 n Y Sony A99 II
 
Canon 5DS R« »optical Y 3.2 1040 fixed n 1/8000s 5.0 n n Canon 5DS R
 
Canon T2i« »optical n 3.0 1040 fixed n 1/4000s 3.7 Y n Canon T2i
 
Nikon D850« »optical Y 3.2 2359 tilting Y 1/8000s 9.0 n n Nikon D850
 
Nikon D5600« »optical n 3.2 1037 swivel Y 1/4000s 5.0 Y n Nikon D5600
 
Nikon D5300« »optical n 3.2 1037 swivel n 1/4000s 5.0 Y n Nikon D5300
 
Nikon D3200« »optical n 3.0 921 fixed n 1/4000s 4.0 Y n Nikon D3200
 
Nikon D5200« »optical n 3.0 921 swivel n 1/4000s 5.0 Y n Nikon D5200
 
Nikon D7000« »optical Y 3.0 921 fixed n 1/8000s 6.0 Y n Nikon D7000
 
Nikon D3100« »optical n 3.0 230 fixed n 1/4000s 3.0 Y n Nikon D3100
 
Nikon D5000« »optical n 2.7 230 full-flex n 1/4000s 4.0 Y n Nikon D5000
 
Sony A7R II« »2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y Sony A7R II
 
Sony A7S II« »2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y Sony A7S II
 
Sony A99« »2359 Y 3.0 1229 full-flex n 1/8000s 6.0 n Y Sony A99
 
Sony NEX-5R« »- n 3.0 920 tilting Y 1/4000s 10.0 n n Sony NEX-5R
 
Sony NEX-5N« »- n 3.0 920 tilting Y 1/4000s 10.0 n n Sony NEX-5N

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.

Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Type
WiFi
Support
NFC
Support
Bluetooth
Support
Camera
Model
 
Nikon D5100»YmonomonoY-mini2.0---Nikon D5100
 
Sony A99 II«YstereomonoYYmicro2.0YYYSony A99 II
 
Canon 5DS R« »YmonomonoY-mini3.0---Canon 5DS R
 
Canon T2i« »Ystereo-Y-mini2.0---Canon T2i
 
Nikon D850« »YstereomonoYYmini3.0YYYNikon D850
 
Nikon D5600« »YstereomonoY-mini2.0YYYNikon D5600
 
Nikon D5300« »YstereomonoY-mini2.0Y--Nikon D5300
 
Nikon D3200« »YmonomonoY-mini2.0---Nikon D3200
 
Nikon D5200« »YstereomonoY-mini2.0---Nikon D5200
 
Nikon D7000« »YmonomonoY-mini2.0---Nikon D7000
 
Nikon D3100« »Ymonomono--mini2.0---Nikon D3100
 
Nikon D5000« »Ymonomono--mini2.0---Nikon D5000
 
Sony A7R II« »YstereomonoYYmicro2.0YY-Sony A7R II
 
Sony A7S II« »YstereomonoYYmicro2.0YY-Sony A7S II
 
Sony A99« »YstereomonoYYmini2.0---Sony A99
 
Sony NEX-5R« »Ystereomono--mini2.0Y--Sony NEX-5R
 
Sony NEX-5N« »Ystereomono--mini2.0---Sony NEX-5N

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 offer 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 it 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 (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

Review Scores
  Camera
Model
cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Nikon D5100»+ +76/1004.5/55/54.5/5 Apr 2011 749- i Nikon D5100
 
Sony A99 II«-85/1004.5/54.5/54.5/5 Sep 2016 3,199 i i Sony A99 II
 
Canon 5DS R« »+83/1005/55/54.5/5 Feb 2015 3,699 i i Canon 5DS R
 
Canon T2i« »+ +77/1004/55/54.5/5 Feb 2010 699- i Canon T2i
 
Nikon D850« »+ +89/1004.5/55/55/5 Jul 2017 3,299 i i Nikon D850
 
Nikon D5600« »-79/1004.5/54.5/54/5 Nov 2016 699 i i Nikon D5600
 
Nikon D5300« »+ +79/1004.5/54.5/54.5/5 Oct 2013 799- i Nikon D5300
 
Nikon D3200« »+ +73/1004.5/54.5/54.5/5 Apr 2012 599- i Nikon D3200
 
Nikon D5200« »+ +79/1004.5/54.5/54.5/5 Nov 2012 749- i Nikon D5200
 
Nikon D7000« »-80/1004.5/55/54.5/5 Sep 2010 1,499- i Nikon D7000
 
Nikon D3100« »+ +72/1004.5/55/54.5/5 Aug 2010 599- i Nikon D3100
 
Nikon D5000« »+ +75/1004/55/54.5/5 Apr 2009 749- i Nikon D5000
 
Sony A7R II« »+ +90/1005/54.5/55/5 Jun 2015 3,199- i Sony A7R II
 
Sony A7S II« »+-4.5/55/55/5 Sep 2015 2,999 i i Sony A7S II
 
Sony A99« »-84/1004.5/5o4.5/5 Sep 2012 2,799- i Sony A99
 
Sony NEX-5R« »--4.5/5-4.5/5 Aug 2012 749- i Sony NEX-5R
 
Sony NEX-5N« »+ +79/1004.5/55/54.5/5 Aug 2011 699- i Sony NEX-5N
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 3199
    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 100-6400 ISO 100-25600 ISO
    ISO Boost 100-25600 ISO 50-25600 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 3.0 inch 3.0 inch
    LCD Resolution 921k dots 1229k dots
    LCD Attachment Swivel screen Fully flexible screen
    Shooting Specs Nikon D5100 Sony A99 II
    Autofocus System Phase-detect AF Phase-detect AF
    Manual Focusing AidNo Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000/s 1/8000/s
    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 Build-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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