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Nikon D90 vs Sony A9

The Nikon D90 and the Sony Alpha A9 are two digital cameras that were announced, respectively, in August 2008 and April 2017. The D90 is a DSLR, while the A9 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (D90) and a full frame (A9) sensor. The Nikon has a resolution of 12.2 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 D90
versus
Sony A9
Nikon D90   Sony A9
Digital single lens reflex Mirrorless system camera
Nikon F mount lenses Sony E mount lenses
12.2 MP – APS-C sensor 24 MP – Full Frame sensor
720/24p Video 4K/30p Video
ISO 200-3,200 (200 - 6,400) ISO 100-51,200 (50 - 204,800)
Optical viewfinder Electronic viewfinder (3686k dots)
3.0" LCD – 920k dots 3.0" LCD – 1440k dots
Fixed screen (not touch-sensitive) Tilting touchscreen
4.5 shutter flaps per second 20 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
850 shots per battery charge650 shots per battery charge
132 x 103 x 77 mm, 703 g 127 x 96 x 63 mm, 673 g
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Check D90 offers at
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Check A9 offers at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Nikon D90 and the Sony Alpha A9? 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

An illustration of the physical size and weight of the Nikon D90 and the Sony A9 is provided in the side-by-side display below. 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 dimensions are rounded to the nearest millimeter.

Size Nikon D90 vs Sony A9
Compare D90 versus A9 top
Comparison D90 or A9 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A9 is notably smaller (10 percent) than the Nikon D90. Moreover, the A9 is slightly lighter (4 percent) than the D90. It is noteworthy in this context that the A9 is splash and dust-proof, while the D90 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 (D90) and the Sony FE Lens Catalog (A9). Mirrorless cameras, such as the A9, 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 D90 gets 850 shots out of its EN-EL3e battery, while the A9 can take 650 images on a single charge of its NP-FZ100 power pack. The power pack in the A9 can be charged via the USB port, which can be very convenient when travelling.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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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 D90 132 mm 103 mm 77 mm 703 g 850 n Aug 2008 1,299ebay.com
2.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499ebay.com
3.
 
Canon 40D 146 mm 108 mm 74 mm 822 g 750 n Aug 2007 1,299ebay.com
4.
 
Nikon D7500 136 mm 104 mm 73 mm 720 g 950 Y Apr 2017 1,299 amazon.com
5.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199ebay.com
6.
 
Nikon D7100 136 mm 107 mm 76 mm 765 g 950 Y Feb 2013 1,199ebay.com
7.
 
Nikon D7000 132 mm 105 mm 77 mm 780 g 1050 Y Sep 2010 1,499ebay.com
8.
 
Nikon D3000 126 mm 97 mm 64 mm 536 g 500 n Jul 2009 599ebay.com
9.
 
Nikon D5000 127 mm 104 mm 80 mm 590 g 510 n Apr 2009 749ebay.com
10.
 
Nikon D60 126 mm 94 mm 64 mm 522 g 500 n Jan 2008 629ebay.com
11.
 
Nikon D40X 124 mm 94 mm 64 mm 522 g 520 n Mar 2007 729ebay.com
12.
 
Nikon D80 132 mm 103 mm 77 mm 668 g 600 n Aug 2006 999ebay.com
13.
 
Panasonic GH5 139 mm 98 mm 87 mm 725 g 410 Y Jan 2017 1,999ebay.com
14.
 
Sony A9 II 129 mm 96 mm 76 mm 678 g 690 Y Oct 2019 4,499 amazon.com
15.
 
Sony A7 III 127 mm 96 mm 74 mm 650 g 610 Y Feb 2018 1,999 amazon.com
16.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199ebay.com
17.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999ebay.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 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 D90 was launched at a markedly lower price (by 71 percent) than the A9, 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. 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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Nikon D90 features an APS-C sensor and the Sony A9 a full frame sensor. The sensor area in the A9 is 127 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 D90 and Sony A9 sensor measures

With 24MP, the A9 offers a higher resolution than the D90 (12.2MP), but the A9 nevertheless has larger individual pixels (pixel pitch of 5.94μm versus 5.53μm for the D90) due to its larger sensor. Moreover, the A9 is a much more recent model (by 8 years and 7 months) than the D90, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units.

The resolution advantage of the Sony A9 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A9 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 D90 are 21.4 x 14.2 inches or 54.5 x 36.2 cm for good quality, 17.2 x 11.4 inches or 43.6 x 28.9 cm for very good quality, and 14.3 x 9.5 inches or 36.3 x 24.1 cm for excellent quality prints.

The A9 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Nikon D90 has a native sensitivity range from ISO 200 to ISO 3200, which can be extended to ISO 200-6400. The corresponding ISO settings for the Sony Alpha A9 are ISO 100 to ISO 51200, with the possibility to increase the ISO range to 50-204800.

In terms of underlying technology, the D90 is build around a CMOS sensor, while the A9 uses a Stacked BSI-CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

D90 versus A9 MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. Of the two cameras under consideration, the A9 offers substantially better image quality than the D90 (overall score 19 points higher). The advantage is based on 2.2 bits higher color depth, 0.8 EV in additional dynamic range, and 1.8 stops in additional 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 D90 APS-C 12.2 4288 2848720/24p22.712.597773
2.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.3351792
3.
 
Canon 40D APS-C 10.1 3888 2592none22.111.370364
4.
 
Nikon D7500 APS-C 20.7 5568 37124K/30p24.314.0148386
5.
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387
6.
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683
7.
 
Nikon D7000 APS-C 16.1 4928 32641080/24p23.513.9116780
8.
 
Nikon D3000 APS-C 10.0 3872 2592none22.311.156362
9.
 
Nikon D5000 APS-C 12.2 4288 2848720/24p22.712.586872
10.
 
Nikon D60 APS-C 10.0 3872 2592none22.511.456265
11.
 
Nikon D40X APS-C 10.0 3872 2592none22.411.451663
12.
 
Nikon D80 APS-C 10.0 3872 2592none22.111.252461
13.
 
Panasonic GH5 Four Thirds 20.2 5184 38884K/60p23.913.080777
14.
 
Sony A9 II Full Frame 24.0 6000 40004K/30p25.014.0343493
15.
 
Sony A7 III Full Frame 24.0 6000 40004K/30p25.014.7373096
16.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
17.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990

Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the A9 provides a better video resolution than the D90. It can shoot movie footage at 4K/30p, while the Nikon is limited to 720/24p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the A9 has an electronic viewfinder (3686k dots), while the D90 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 A9 offers a wider field of view (100%) than the one in the D90 (96%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the A9 has a higher magnification (0.78x vs 0.63x), 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 D90 and Sony A9 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 D90optical Y3.0 / 920 fixed n 1/4000s 4.5/s Y n
2.
 
Sony A93686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
3.
 
Canon 40Doptical Y3.0 / 230 fixed n 1/8000s 6.5/s Y n
4.
 
Nikon D7500optical Y3.2 / 922 tilting Y 1/8000s 8.0/s Y n
5.
 
Nikon D7200optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
6.
 
Nikon D7100optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
7.
 
Nikon D7000optical Y3.0 / 921 fixed n 1/8000s 6.0/s Y n
8.
 
Nikon D3000optical n3.0 / 230 fixed n 1/4000s 3.0/s Y n
9.
 
Nikon D5000optical n2.7 / 230 full-flex n 1/4000s 4.0/s Y n
10.
 
Nikon D60optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
11.
 
Nikon D40Xoptical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
12.
 
Nikon D80optical n2.5 / 230 fixed n 1/4000s 3.0/s Y n
13.
 
Panasonic GH53680 n3.2 / 1620 swivel Y 1/8000s 12.0/s n Y
14.
 
Sony A9 II3686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
15.
 
Sony A7 III2359 n3.0 / 922 tilting Y 1/8000s 10.0/s n Y
16.
 
Sony A7R III3686 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
17.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
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 D90 has one, while the A9 does not. While the built-in flash of the D90 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 A9 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 D90 writes its imaging data to SDHC cards, while the A9 uses SDXC or Memory Stick PRO Duo cards. The A9 features dual card slots, which can be very useful in case a memory card fails. In contrast, the D90 only has one slot. The A9 supports UHS-II cards on its first slot and UHS-I on its second one, while the D90 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 D90 and Sony Alpha A9 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 D90Ymono / mono--mini2.0---
2.
 
Sony A9Ystereo / monoYYmicro2.0YYY
3.
 
Canon 40DY- / ----2.0---
4.
 
Nikon D7500Ystereo / monoYYmini2.0Y-Y
5.
 
Nikon D7200Ystereo / monoYYmini2.0YY-
6.
 
Nikon D7100Ystereo / monoYYmini2.0---
7.
 
Nikon D7000Ymono / monoY-mini2.0---
8.
 
Nikon D3000Y- / ----2.0---
9.
 
Nikon D5000Ymono / mono--mini2.0---
10.
 
Nikon D60Y- / ----2.0---
11.
 
Nikon D40XY- / ----2.0---
12.
 
Nikon D80Y- / ----2.0---
13.
 
Panasonic GH5Ystereo / monoYYfull3.1Y-Y
14.
 
Sony A9 IIYstereo / monoYYmicro3.1YYY
15.
 
Sony A7 IIIYstereo / monoYYmicro3.1YYY
16.
 
Sony A7R IIIYstereo / monoYYmicro3.1YYY
17.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-

It is notable that the A9 offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the D90 does not provide wifi capability.

Studio photographers will appreciate that the Sony A9 (unlike the D90) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the D90 and the A9 have been discontinued, but can regularly be found used on ebay. The D90 was replaced by the Nikon D7000, while the A9 was followed by the Sony A9 II. Further information on the features and operation of the D90 and A9 can be found, respectively, in the Nikon D90 Manual (free pdf) or the online Sony A9 Manual.

Review summary

So how do things add up? Is there a clear favorite between the Nikon D90 and the Sony A9? Which camera is better? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Nikon D90:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Longer lasting: Can take more shots (850 versus 650) 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 (71 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in August 2008).

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Advantages of the Sony Alpha A9:

  • More detail: Has more megapixels (24 vs 12.2MP), which boosts linear resolution by 40%.
  • Better image quality: Scores substantially higher (19 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (2.2 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (0.8 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1.8 stops ISO advantage).
  • Better video: Provides higher definition movie capture (4K/30p vs 720/24p).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More complete view: Has a viewfinder with a larger field of view (100% vs 96%).
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.63x).
  • More detailed LCD: Has a higher resolution rear screen (1440k vs 920k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (20 vs 4.5 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.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • 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.
  • Faster buffer clearing: Supports Ultra High Speed (UHS-II and UHS-I) SDXC cards.
  • More modern: Reflects 8 years and 7 months of technical progress since the D90 launch.

If the count of relative strengths (bullet points above) is taken as a measure, the A9 is the clear winner of the contest (29 : 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.

D90 06:29 A9

How about other alternatives? Do the specifications of the Nikon D90 and the Sony A9 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the D90 or the A9 perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is where reviews by experts come in. 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 D90..+ +..+ +4/54.5/5 Aug 2008 1,299ebay.com
2.
 
Sony A95/5+ +4.8/589/1005/55/5 Apr 2017 4,499ebay.com
3.
 
Canon 40D..+ +..+ +4.5/54.5/5 Aug 2007 1,299ebay.com
4.
 
Nikon D75004.5/5+ +4.5/586/1005/54.5/5 Apr 2017 1,299 amazon.com
5.
 
Nikon D72004/5+ +..84/1004.5/54.5/5 Mar 2015 1,199ebay.com
6.
 
Nikon D71005/5+ +..85/1004.5/54.5/5 Feb 2013 1,199ebay.com
7.
 
Nikon D70004/5....80/1004.5/54.5/5 Sep 2010 1,499ebay.com
8.
 
Nikon D3000..+..72/1004/54.5/5 Jul 2009 599ebay.com
9.
 
Nikon D5000..+ +..75/1004/54.5/5 Apr 2009 749ebay.com
10.
 
Nikon D60..80/100..+ +4/54.5/5 Jan 2008 629ebay.com
11.
 
Nikon D40X..79/100..+ +4/54/5 Mar 2007 729ebay.com
12.
 
Nikon D80..+..+ +o4.5/5 Aug 2006 999ebay.com
13.
 
Panasonic GH54.5/5+ +..85/1004.5/55/5 Jan 2017 1,999ebay.com
14.
 
Sony A9 II....5/590/1005/55/5 Oct 2019 4,499 amazon.com
15.
 
Sony A7 III..+ +4.5/589/1005/55/5 Feb 2018 1,999 amazon.com
16.
 
Sony A7R III..+ +4/590/1004.5/55/5 Oct 2017 3,199ebay.com
17.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999ebay.com
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Check D90 offers at
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Check A9 offers at
ebay.com

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 use the search menu below. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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    Specifications: Nikon D90 vs Sony A9

    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 D90 Sony A9
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Nikon F mount lenses Sony E mount lenses
    Launch Date August 2008 April 2017
    Launch Price USD 1,299 USD 4,499
    Sensor Specs Nikon D90 Sony A9
    Sensor Technology CMOS Stacked BSI-CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.6 x 15.8 mm 35.6 x 23.8 mm
    Sensor Area 372.88 mm2 847.28 mm2
    Sensor Diagonal 28.4 mm 42.8 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 12.2 Megapixels 24 Megapixels
    Image Resolution 4288 x 2848 pixels 6000 x 4000 pixels
    Pixel Pitch 5.53 μm 5.94 μm
    Pixel Density 3.28 MP/cm2 2.83 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 720/24p Video 4K/30p Video
    ISO Setting 200 - 3,200 ISO 100 - 51,200 ISO
    ISO Boost 200 - 6,400 ISO 50 - 204,800 ISO
    Image Processor EXPEED BIONZ X
    DXO Sensor Quality (score) 73 92
    DXO Color Depth (bits) 22.7 24.9
    DXO Dynamic Range (EV) 12.5 13.3
    DXO Low Light (ISO) 977 3517
    Screen Specs Nikon D90 Sony A9
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 96% 100%
    Viewfinder Magnification 0.63x 0.78x
    Viewfinder Resolution 3686k dots
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 920k dots 1440k dots
    LCD Attachment Fixed screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Nikon D90 Sony A9
    Focus System Phase-detect AF On-Sensor Phase-detect
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 4.5 shutter flaps/s 20 shutter flaps/s
    Shutter Life Expectancy100 000 actuations500 000 actuations
    Electronic Shutterno E-Shutterup to 1/32000s
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium SDHC cards MS or SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support no Single UHS-II
    Connectivity Specs Nikon D90 Sony A9
    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 no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support no Wifi Wifi built-in
    Near-Field Communication no NFC NFC built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Nikon D90 Sony A9
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type EN-EL3e NP-FZ100
    Battery Life (CIPA)850 shots per charge650 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 132 x 103 x 77 mm
    (5.2 x 4.1 x 3.0 in)
    127 x 96 x 63 mm
    (5.0 x 3.8 x 2.5 in)
    Camera Weight 703 g (24.8 oz) 673 g (23.7 oz)
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    Check D90 offers at
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    Check A9 offers at
    ebay.com

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