Sony A6400 vs A900
The Sony Alpha A6400 and the Sony Alpha A900 are two digital cameras that were officially introduced, respectively, in January 2019 and September 2008. The A6400 is a mirrorless interchangeable lens camera, while the A900 is a DSLR. The cameras are based on an APS-C (A6400) and a full frame (A900) sensor. The A6400 has a resolution of 24 megapixels, whereas the A900 provides 24.4 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha A6400 and the Sony Alpha A900? 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.
An illustration of the physical size and weight of the Sony A6400 and the Sony A900 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.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A900 is considerably larger (127 percent) than the Sony A6400. Moreover, the A900 is substantially heavier (122 percent) than the A6400. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
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 A900 can take 880 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 table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.
|1.||Sony A6400||120 mm||67 mm||50 mm||403 g||410||Y||Jan 2019||899|
|2.||Sony A900||156 mm||117 mm||82 mm||895 g||880||Y||Sep 2008||2,999|
|3.||Fujifilm X-T30||118 mm||83 mm||47 mm||383 g||380||n||Feb 2019||899|
|4.||Nikon D5300||125 mm||98 mm||76 mm||480 g||600||n||Oct 2013||799|
|5.||Sony A6100||120 mm||67 mm||59 mm||396 g||420||n||Aug 2019||749|
|6.||Sony A9||127 mm||96 mm||63 mm||673 g||650||Y||Apr 2017||4,499|
|7.||Sony A99 II||143 mm||104 mm||76 mm||849 g||490||Y||Sep 2016||3,199|
|8.||Sony A6300||120 mm||67 mm||49 mm||404 g||400||Y||Feb 2016||999|
|9.||Sony A7S II||127 mm||96 mm||60 mm||627 g||370||Y||Sep 2015||2,999|
|10.||Sony A5100||110 mm||63 mm||36 mm||283 g||400||n||Aug 2014||549|
|11.||Sony A6000||120 mm||67 mm||45 mm||344 g||360||n||Feb 2014||599|
|12.||Sony A3000||128 mm||91 mm||85 mm||411 g||470||n||Aug 2013||329|
|13.||Sony A99||147 mm||111 mm||78 mm||812 g||500||Y||Sep 2012||2,799|
|14.||Sony NEX-5R||111 mm||59 mm||39 mm||276 g||330||n||Aug 2012||749|
|15.||Sony NEX-6||120 mm||67 mm||43 mm||345 g||360||n||Sep 2012||999|
|16.||Sony NEX-7||120 mm||67 mm||43 mm||400 g||430||n||Aug 2011||1,349|
|17.||Sony A850||156 mm||117 mm||82 mm||895 g||880||Y||Aug 2009||1,999|
|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 A6400 was launched at a markedly lower price (by 70 percent) than the A900, 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.
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 tend to be associated with larger, more expensive camera bodies and lenses.
Of the two cameras under consideration, the Sony A6400 features an APS-C sensor and the Sony A900 a full frame sensor. The sensor area in the A900 is 135 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.
In terms of chip-set technology, the A6400 uses a more advanced image processing engine (BIONZ X) than the A900 (BIONZ), with benefits for noise reduction, color accuracy, and processing speed.
With 24.4MP, the A900 offers a higher resolution than the A6400 (24MP), but the A900 nevertheless has larger individual pixels (pixel pitch of 5.94μm versus 3.91μm for the A6400) due to its larger sensor. However, the A6400 is a much more recent model (by 10 years and 4 months) than the A900, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.
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 A900 are ISO 200 to ISO 3200, with the possibility to increase the ISO range to 100-6400.
Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 review, the A6400 has a notably higher overall DXO score than the A900 (overall score 4 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 0.3 bits higher color depth, 1.3 EV in additional dynamic range, The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
| DXO |
|2.||Sony A900||Full Frame||24.4||6048||4032||none||23.7||12.3||1431||79|
|6.||Sony A9||Full Frame||24.0||6000||4000||4K/30p||24.9||13.3||3517||92|
|7.||Sony A99 II||Full Frame||42.2||7952||5304||4K/30p||25.4||13.4||2317||92|
|9.||Sony A7S II||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|13.||Sony A99||Full Frame||24.0||6000||4000||1080/60p||25.0||14.0||1555||89|
|17.||Sony A850||Full Frame||24.4||6048||4032||none||23.8||12.2||1415||79|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. The A6400 indeed provides movie recording capabilities, while the A900 does not. The highest resolution format that the A6400 can use is 4K/30p.
Beyond body and sensor, cameras can and do differ across a range of features. For example, the A6400 has an electronic viewfinder (2359k dots), while the A900 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 viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the A900 has a higher magnification than the one of the A6400 (0.74x vs 0.70x), 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 Sony A6400 and Sony A900 along with similar information for a selection of comparators.
|7.||Sony A99 II||2400||Y||3.0||1229||full-flex||n||1/8000s||12.0||n||Y|
|9.||Sony A7S II||2400||n||3.0||1229||tilting||n||1/8000s||5.0||n||Y|
One difference between the cameras concerns the presence of an on-board flash. The A6400 has one, while the A900 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.The A6400 has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the A900 does not have a selfie-screen.
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).
The A6400 writes its imaging data to SDXC or Memory Stick PRO Duo cards, while the A900 uses Compact Flash or Memory Stick PRO Duo cards. The A900 features dual card slots, which can be very useful in case a memory card fails. In contrast, the A6400 only has one slot.
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 A900 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
| NFC |
|7.||Sony A99 II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||Y|
|9.||Sony A7S II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-|
It is notable that the A6400 offers wifi support, while the A900 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 A900 (unlike the A6400) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
The A6400 is a recent model that features in the current product line-up of Sony. In contrast, the A900 has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the A900 was succeeded by the Sony A99. 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? Is the Sony A6400 better than the Sony A900 or vice versa? Below is a summary of the relative strengths of each of the two contestants.
Advantages of the Sony Alpha A6400:
- Better image quality: Scores markedly higher (4 points) in the DXO overall assessment.
- More dynamic range: Captures a larger spectrum of light and dark details (1.3 EV of extra DR).
- Better jpgs: Has a more modern image processing engine (BIONZ X vs BIONZ).
- Broader imaging potential: Can record not only still images but also 4K/30p movies.
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- More framing info: Has an electronic viewfinder that displays shooting data.
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Faster burst: Shoots at higher frequency (11 vs 5 flaps/sec) to capture the decisive moment.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- More compact: Is smaller (120x67mm vs 156x117mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 492g or 55 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 (70 percent cheaper at launch).
- More modern: Reflects 10 years and 4 months of technical progress since the A900 launch.
Arguments in favor of the Sony Alpha A900:
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.74x vs 0.70x).
- Easier setting verification: Features a control panel on top to check shooting parameters.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Longer lasting: Gets more shots (880 versus 410) out of a single battery charge.
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
- 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 heavily discounted: Has been around for much longer (launched in September 2008).
If the count of individual advantages (bullet points above) is taken as a guide, the A6400 is the clear winner of the match-up (21 : 9 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 A900 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 A900 in practical situations. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.
This is why hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], 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.
|1.||Sony A6400||4/5||+||85/100||4.5/5||4/5||Jan 2019||899|
|2.||Sony A900||..||+ +||+ +||4.5/5||5/5||Sep 2008||2,999|
|3.||Fujifilm X-T30||5/5||+ +||84/100||4.5/5||4.5/5||Feb 2019||899|
|4.||Nikon D5300||4/5||+ +||79/100||4.5/5||4.5/5||Oct 2013||799|
|5.||Sony A6100||..||..||82/100||4/5||5/5||Aug 2019||749|
|6.||Sony A9||5/5||+ +||89/100||5/5||5/5||Apr 2017||4,499|
|7.||Sony A99 II||..||..||85/100||4.5/5||4.5/5||Sep 2016||3,199|
|8.||Sony A6300||4.5/5||+||85/100||5/5||5/5||Feb 2016||999|
|9.||Sony A7S II||5/5||+||..||4.5/5||5/5||Sep 2015||2,999|
|10.||Sony A5100||4.5/5||+||..||4.5/5||5/5||Aug 2014||549|
|11.||Sony A6000||5/5||+||80/100||4.5/5||5/5||Feb 2014||599|
|12.||Sony A3000||3/5||+||..||4/5||4/5||Aug 2013||329|
|13.||Sony A99||5/5||..||84/100||4.5/5||4.5/5||Sep 2012||2,799|
|14.||Sony NEX-5R||..||..||..||4.5/5||4.5/5||Aug 2012||749|
|15.||Sony NEX-6||5/5||+ +||78/100||4.5/5||4.5/5||Sep 2012||999|
|16.||Sony NEX-7||5/5||+ +||81/100||4.5/5||5/5||Aug 2011||1,349|
|17.||Sony A850||3/5||..||75/100||..||4.5/5||Aug 2009||1,999|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.
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.
Specifications: Sony A6400 vs Sony A900
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 A900|
|Camera Type||Mirrorless system camera||Digital single lens reflex|
|Camera Lens||Sony E mount lenses||Sony A mount lenses|
|Launch Date||January 2019||September 2008|
|Launch Price||USD 899||USD 2,999|
|Sensor Specs||Sony A6400||Sony A900|
|Sensor Format||APS-C Sensor||Full Frame Sensor|
|Sensor Size||23.5 x 15.6 mm||35.9 x 24.0 mm|
|Sensor Area||366.6 mm2||861.6 mm2|
|Sensor Diagonal||28.2 mm||43.2 mm|
|Sensor Resolution||24 Megapixels||24.4 Megapixels|
|Image Resolution||6000 x 4000 pixels||6048 x 4032 pixels|
|Pixel Pitch||3.91 μm||5.94 μm|
|Pixel Density||6.55 MP/cm2||2.83 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||4K/30p Video||no Video|
|ISO Setting||100 - 32,000 ISO||200 - 3,200 ISO|
|ISO Boost||100 - 102,400 ISO||100 - 6,400 ISO|
|Image Processor||BIONZ X||BIONZ|
|DXO Sensor Quality (score)||83||79|
|DXO Color Depth (bits)||24||23.7|
|DXO Dynamic Range (EV)||13.6||12.3|
|DXO Low Light (ISO)||1431||1431|
|Screen Specs||Sony A6400||Sony A900|
|Viewfinder Type||Electronic viewfinder||Optical viewfinder|
|Viewfinder Field of View||100%||100%|
|Viewfinder Resolution||2359k dots|
|Top-Level Screen||no Top Display||Control Panel|
|LCD Framing||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||922k dots||922k dots|
|LCD Attachment||Tilting screen||Fixed screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Sony A6400||Sony A900|
|Focus System||On-Sensor Phase-detect||Phase-detect AF|
|Manual Focusing Aid||Focus Peaking||no Peaking Feature|
|Continuous Shooting||11 shutter flaps/s||5 shutter flaps/s|
|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||CF or MS cards|
|Second Storage Option||Single card slot||Dual card slots|
|Connectivity Specs||Sony A6400||Sony A900|
|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||no MIC socket|
|Wifi Support||Wifi built-in||no Wifi|
|Near-Field Communication||NFC built-in||no NFC|
|Bluetooth Support||Bluetooth built-in||no Bluetooth|
|Body Specs||Sony A6400||Sony A900|
|Environmental Sealing||Weathersealed body||Weathersealed body|
|Battery Life (CIPA)||410 shots per charge||880 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)
156 x 117 x 82 mm
(6.1 x 4.6 x 3.2 in)
|Camera Weight||403 g (14.2 oz)||895 g (31.6 oz)|
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