Sony A6400 vs A99
The Sony Alpha A6400 and the Sony Alpha SLT-A99 are two digital cameras that were officially introduced, respectively, in January 2019 and September 2012. The A6400 is a mirrorless interchangeable lens camera, while the A99 is a DSLR. The cameras are based on an APS-C (A6400) and a full frame (A99) sensor. Both cameras offer a resolution of 24 megapixels.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
|Sony A6400||Sony A99|
|Mirrorless system camera||Digital single lens reflex|
|Sony E mount lenses||Sony A mount lenses|
|24 MP, APS-C Sensor||24 MP, Full Frame Sensor|
|4K/30p Video||1080/60p Video|
|ISO 100-32,000 (100 - 102,400)||ISO 100-25,600|
|Electronic viewfinder (2359k dots)||Electronic viewfinder (2359k dots)|
|3.0 LCD, 922k dots||3.0 LCD, 1229k dots|
|Tilting touchscreen||Fully flexible screen (no touchscreen)|
|11 shutter flaps per second||6 shutter flaps per second|
|Lens stabilization only||In-body stabilization|
|not weather sealed||Weathersealed body|
|410 shots per battery charge||500 shots per battery charge|
|120 x 67 x 50 mm, 403 g||147 x 111 x 78 mm, 812 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha A6400 and the Sony Alpha SLT-A99? 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.
The side-by-side display below illustrates the physical size and weight of the Sony A6400 and the Sony A99. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth measures are rounded to the nearest millimeter.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A99 is considerably larger (103 percent) than the Sony A6400. Moreover, the A99 is substantially heavier (101 percent) than the A6400. It is noteworthy in this context that the A99 is splash and dust-proof, while the A6400 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 A6400 gets 410 shots out of its NP-FW50 battery, while the A99 can take 500 images on a single charge of its NP-FM500H power pack. The power pack in the A6400 can be charged via the USB port, so that it is not always necessary to take the battery charger along 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, just click on the right or left arrow next to the camera that you would like to inspect. Alternatively, you can also use the CAM-parator to select your camera combination among a larger number of options.
|Sony A6400||4.7 in||2.6 in||2.0 in||14.2 oz||410||n||Jan 2019||899|
|Sony A99||5.8 in||4.4 in||3.1 in||28.6 oz||500||Y||Sep 2012||2,799|
|Fujifilm X-T30||4.6 in||3.3 in||1.9 in||13.5 oz||380||n||Feb 2019||899|
|Nikon D5300||4.9 in||3.9 in||3.0 in||16.9 oz||600||n||Oct 2013||799|
|Sony A9 II||5.1 in||3.8 in||3.0 in||23.9 oz||690||Y||Oct 2019||4,499|
|Sony A6100||4.7 in||2.6 in||2.3 in||14.0 oz||420||n||Aug 2019||749|
|Sony A99 II||5.6 in||4.1 in||3.0 in||29.9 oz||490||Y||Sep 2016||3,199|
|Sony A6300||4.7 in||2.6 in||1.9 in||14.3 oz||400||Y||Feb 2016||999|
|Sony A5100||4.3 in||2.5 in||1.4 in||10.0 oz||400||n||Aug 2014||549|
|Sony A6000||4.7 in||2.6 in||1.8 in||12.1 oz||360||n||Feb 2014||599|
|Sony A3000||5.0 in||3.6 in||3.3 in||14.5 oz||470||n||Aug 2013||329|
|Sony NEX-5R||4.4 in||2.3 in||1.5 in||9.7 oz||330||n||Aug 2012||749|
|Sony NEX-6||4.7 in||2.6 in||1.7 in||12.2 oz||360||n||Sep 2012||999|
|Sony A77||5.6 in||4.1 in||3.2 in||25.8 oz||470||Y||Aug 2011||1,399|
|Sony NEX-7||4.7 in||2.6 in||1.7 in||14.1 oz||430||n||Aug 2011||1,349|
|Sony A850||6.1 in||4.6 in||3.2 in||31.6 oz||880||Y||Aug 2009||1,999|
|Sony A900||6.1 in||4.6 in||3.2 in||31.6 oz||880||Y||Sep 2008||2,999|
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
(1) Number of images that can be taken on a full battery charge according to the CIPA-standard; (2) Official announcement.
Any camera decision will naturally be influenced heavily by the price. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The A6400 was launched at a markedly lower price (by 68 percent) than the A99, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
The size of the imaging sensor is a crucial determinant of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units 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 Sony A6400 features an APS-C sensor and the Sony A99 a full frame sensor. The sensor area in the A99 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.
Even though the A99 has a larger sensor, both cameras offer the same resolution of 24 megapixels. This implies that the A99 has a lower pixel density and larger individual pixels (with a pixel pitch of 5.96μm versus 3.91μm for the A6400), which gives it a potential advantage in terms of light gathering capacity. It should, however, be noted that the A6400 is much more recent (by 6 years and 4 months) than the A99, and its sensor will have benefitted from technological advances during this time that at least partly compensate for the smaller pixel size.
The A6400 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
The Sony Alpha A6400 has a native sensitivity range from ISO 100 to ISO 32000, which can be extended to ISO 100-102400. The corresponding ISO settings for the Sony Alpha SLT-A99 are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-25600.
For many cameras, data on sensor performance has been reported by DXO Mark. 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 A99 has a markedly higher DXO score than the A6400 (overall score 6 points higher), which will translate into better image quality. The advantage is based on 1 bits higher color depth, 0.4 EV in additional dynamic range, and 0.1 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Sony A99||Full Frame||24.0||6000||4000||1080/60p||25.0||14.0||1555||89|
|Sony A9 II||Full Frame||24.0||6000||4000||4K/30p||25.0||14.0||3434||93|
|Sony A99 II||Full Frame||42.2||7952||5304||4K/30p||25.4||13.4||2317||92|
|Sony A850||Full Frame||24.4||6048||4032||none||23.8||12.2||1415||79|
|Sony A900||Full Frame||24.4||6048||4032||none||23.7||12.3||1431||79|
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 A6400 provides a higher video resolution than the A99. It can shoot video footage at 4K/30p, while the A99 is limited to 1080/60p.
Apart from body and sensor, cameras can and do differ across a variety of features. The A6400 and the A99 are similar in the sense that both feature an electronic viewfinder, which is helpful when framing images in bright sunlight. Moreover, their viewfinders offer an identical resolution of 2359k dots. The table below summarizes some of the other core capabilities of the Sony A6400 and Sony A99 in connection with corresponding information for a sample of similar cameras.
|Sony A9 II||3686||n||3.0||1440||tilting||Y||1/8000s||10.0||n||Y|
|Sony A99 II||2400||Y||3.0||1229||full-flex||n||1/8000s||12.0||n||Y|
One difference between the cameras concerns the presence of an on-board flash. The A6400 has one, while the A99 does not. While the built-in flash of the A6400 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 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 A6400 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).
Concerning the storage of imaging data, both the A6400 and the A99 write their files to SDXC or Memory Stick PRO Duo cards. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.
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 Sony Alpha A6400 and Sony Alpha SLT-A99 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
|Sony A9 II||Y||stereo||mono||Y||Y||micro||3.1||Y||Y||Y|
|Sony A99 II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||Y|
It is notable that the A6400 offers wifi support, while the A99 does not. Wifi can be a very convenient means to transfer image data to an off-camera location.
Studio photographers will appreciate that the Sony A99 (unlike the A6400) 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 A99 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.
The A6400 is a recent model that features in the current product line-up of Sony. In contrast, the A99 has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the A99 was succeeded by the Sony A99 II. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Sony website.
So what conclusions can be drawn? Which of the two cameras – the Sony A6400 or the Sony A99 – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.
Advantages of the Sony Alpha A6400:
- Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- Faster burst: Shoots at higher frequency (11 vs 6 flaps/sec) to capture the decisive moment.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- More compact: Is smaller (120x67mm vs 147x111mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 409g or 50 percent) and hence easier to carry around.
- Easier travel charging: Can be conveniently charged via its USB port.
- More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- 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.
- More affordable: Was introduced into a lower priced category (68 percent cheaper at launch).
- More modern: Reflects 6 years and 4 months of technical progress since the A99 launch.
Reasons to prefer the Sony Alpha SLT-A99:
- Better image quality: Scores markedly higher (6 points) in the DXO overall evaluation.
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.71x vs 0.70x).
- Easier setting verification: Features a control panel on top to check shooting parameters.
- More detailed LCD: Has a higher resolution rear screen (1229k vs 922k dots).
- More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Longer lasting: Gets more shots (500 versus 410) out of a single battery charge.
- 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.
- More heavily discounted: Has been around for much longer (launched in September 2012).
If the count of relative strengths (bullet points above) is taken as a measure, the A6400 comes out slightly ahead of the A99 (14 : 13 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.
How about other alternatives? Do the specifications of the Sony A6400 and the Sony A99 place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings 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 A6400 and the A99 in practical situations. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.
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 (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.
|Sony A6400||+||85/100||4.5/5||..||4/5||Jan 2019||899|
|Sony A99||..||84/100||4.5/5||o||4.5/5||Sep 2012||2,799|
|Fujifilm X-T30||+ +||84/100||4.5/5||5/5||4.5/5||Feb 2019||899|
|Nikon D5300||+ +||79/100||4.5/5||4.5/5||4.5/5||Oct 2013||799|
|Sony A9 II||..||90/100||5/5||..||5/5||Oct 2019||4,499|
|Sony A6100||..||82/100||4/5||..||5/5||Aug 2019||749|
|Sony A99 II||..||85/100||4.5/5||4.5/5||4.5/5||Sep 2016||3,199|
|Sony A6300||+||85/100||5/5||5/5||5/5||Feb 2016||999|
|Sony A5100||+||..||4.5/5||4.5/5||5/5||Aug 2014||549|
|Sony A6000||+||80/100||4.5/5||5/5||5/5||Feb 2014||599|
|Sony A3000||+||..||4/5||4.5/5||4/5||Aug 2013||329|
|Sony NEX-5R||..||..||4.5/5||..||4.5/5||Aug 2012||749|
|Sony NEX-6||+ +||78/100||4.5/5||5/5||4.5/5||Sep 2012||999|
|Sony A77||91/100||81/100||..||4.5/5||5/5||Aug 2011||1,399|
|Sony NEX-7||+ +||81/100||4.5/5||5/5||5/5||Aug 2011||1,349|
|Sony A850||..||75/100||..||4/5||4.5/5||Aug 2009||1,999|
|Sony A900||+ +||+ +||4.5/5||4/5||5/5||Sep 2008||2,999|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The review scores listed above should be treated with care, 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, please note that some of the review sites have changed their methodology and reporting over time.
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.
- Canon 1300D vs Sony A99
- Canon M50 vs Sony A6400
- Canon XT vs Sony A99
- Leica V-LUX 3 vs Sony A6400
- Olympus E-330 vs Sony A99 II
- Panasonic G2 vs Sony A99 II
- Sony A5100 vs Sony A99 II
- Sony A6400 vs Sony A68
- Sony A6400 vs Sony NEX-5T
- Sony A7S II vs Sony A99 II
- Sony A99 II vs Sony RX100 VII
- Sony A99 vs Sony RX10 III
Specifications: Sony A6400 vs Sony A99
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 Model||Sony A6400||Sony A99|
|Camera Type||Mirrorless system camera||Digital single lens reflex|
|Camera Lens||Sony E mount lenses||Sony A mount lenses|
|Launch Date||January 2019||September 2012|
|Launch Price||USD 899||USD 2,799|
|Sensor Specs||Sony A6400||Sony A99|
|Sensor Format||APS-C Sensor||Full Frame Sensor|
|Sensor Size||23.5 x 15.6 mm||35.8 x 23.8 mm|
|Sensor Area||366.6 mm2||852.04 mm2|
|Sensor Diagonal||28.2 mm||43 mm|
|Sensor Resolution||24 Megapixels||24 Megapixels|
|Image Resolution||6000 x 4000 pixels||6000 x 4000 pixels|
|Pixel Pitch||3.91 μm||5.96 μm|
|Pixel Density||6.55 MP/cm2||2.82 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||4K/30p Video||1080/60p Video|
|ISO Setting||100 - 32,000 ISO||100 - 25,600 ISO|
|ISO Boost||100 - 102,400 ISO||50 - 25,600 ISO|
|Image Processor||BIONZ X||BIONZ X|
|DXO Sensor Quality (score)||83||89|
|DXO Color Depth (bits)||24||25.0|
|DXO Dynamic Range (EV)||13.6||14.0|
|DXO Low Light (ISO)||1431||1555|
|Screen Specs||Sony A6400||Sony A99|
|Viewfinder Type||Electronic viewfinder||Electronic viewfinder|
|Viewfinder Field of View||100%||100%|
|Viewfinder Resolution||2359k dots||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||922k dots||1229k dots|
|LCD Attachment||Tilting screen||Fully flexible screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Sony A6400||Sony A99|
|Focus System||On-Sensor Phase-detect||Phase-detect AF|
|Manual Focusing Aid||Focus Peaking||Focus Peaking|
|Max Shutter Speed (mechanical)||1/4000s||1/8000s|
|Continuous Shooting||11 shutter flaps/s||6 shutter flaps/s|
|Shutter Life Expectancy||200 000 actuations||200 000 actuations|
|Electronic Shutter||YES||no E-Shutter|
|Image Stabilization||Lens stabilization only||In-body stabilization|
|Fill Flash||Build-in Flash||no On-Board Flash|
|Storage Medium||MS or SDXC cards||MS or SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|UHS card support||UHS-I||UHS-I|
|Connectivity Specs||Sony A6400||Sony A99|
|Studio Flash||no PC Sync||PC Sync socket|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||micro HDMI||mini HDMI|
|Microphone Port||External MIC port||External MIC port|
|Headphone Socket||no Headphone port||Headphone port|
|Wifi Support||Wifi built-in||no Wifi|
|Near-Field Communication||NFC built-in||no NFC|
|Bluetooth Support||Bluetooth built-in||no Bluetooth|
|Geotagging||no internal GPS||GPS built-in|
|Body Specs||Sony A6400||Sony A99|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||410 shots per charge||500 shots per charge|
|In-Camera Charging||USB charging||no USB charging|
120 x 67 x 50 mm
(4.7 x 2.6 x 2.0 in)
147 x 111 x 78 mm
(5.8 x 4.4 x 3.1 in)
|Camera Weight||403 g (14.2 oz)||812 g (28.6 oz)|
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