Sony A900 vs RX100
The Sony Alpha A900 and the Sony Cyber-shot DSC-RX100 are two digital cameras that were announced, respectively, in September 2008 and June 2012. The A900 is a DSLR, while the RX100 is a fixed lens compact. The cameras are based on a full frame (A900) and an one-inch (RX100) sensor. The A900 has a resolution of 24.4 megapixels, whereas the RX100 provides 20 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.
|Sony A900||Sony RX100|
|Digital single lens reflex||Fixed lens compact camera|
|Sony A mount lenses||28-100mm f/1.8-4.9|
|24.4 MP, Full Frame Sensor||20 MP, 1" Sensor|
|no Video||1080/60p Video|
|ISO 200-3200 (100-6400)||ISO 100-6400 (100-25600)|
|Optical viewfinder||No viewfinder, LCD framing|
|3.0" LCD, 922k dots||3.0" LCD, 1229k dots|
|Fixed screen (not touch-sensitive)||Fixed screen (not touch-sensitive)|
|5 shutter flaps per second||10 shutter flaps per second|
|In-body stabilization||Lens-based stabilization|
|Weathersealed body||Not weather sealed|
|880 shots per battery charge||330 shots per battery charge|
|156 x 117 x 82 mm, 895 g||102 x 58 x 36 mm, 240 g|
Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha A900 and the Sony Cyber-shot DSC-RX100? 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 A900 and the Sony RX100. 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 RX100 is considerably smaller (68 percent) than the Sony A900. It is worth mentioning in this context that the A900 is splash and dust resistant, while the RX100 does not feature any corresponding weather-sealing.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the RX100 has a lens built in, whereas the A900 is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup.
Concerning battery life, the A900 gets 880 shots out of its NP-FM500H battery, while the RX100 can take 330 images on a single charge of its NP-BX1 power pack. The power pack in the RX100 can be charged via the USB port, which can be very convenient when travelling.
The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you would like to visualize and compare a different camera combination, just use the right or left arrows in the table to switch to the respective camera. Alternatively, you can also navigate to the CAM-parator app and make your selection from the full list of cameras there.
|Sony A900»||6.1 in||4.6 in||3.2 in||31.6 oz||880||Y||Sep 2008||2,999||Sony A900|
|Sony RX100«||4.0 in||2.3 in||1.4 in||8.5 oz||330||n||Jun 2012||649||Sony RX100|
|Canon G9 X Mark II« »||3.9 in||2.3 in||1.2 in||7.3 oz||235||n||Jan 2017||529||Canon G9 X Mark II|
|Canon G9 X« »||3.9 in||2.3 in||1.2 in||7.4 oz||220||n||Oct 2015||529||Canon G9 X|
|Canon 5D Mark III« »||6.0 in||4.6 in||3.0 in||33.5 oz||950||Y||Mar 2012||3,499||Canon 5D Mark III|
|Canon 5D Mark II« »||6.0 in||4.5 in||3.0 in||30.0 oz||850||Y||Sep 2008||3,499||Canon 5D Mark II|
|Nikon D700« »||5.8 in||4.8 in||3.0 in||37.9 oz||1000||Y||Jul 2008||2,999||Nikon D700|
|Panasonic S1« »||5.9 in||4.3 in||3.8 in||35.9 oz||400||Y||Feb 2019||2,499||Panasonic S1|
|Sony A7 III« »||5.0 in||3.8 in||2.9 in||22.9 oz||610||Y||Feb 2018||1,999||Sony A7 III|
|Sony A9« »||5.0 in||3.8 in||2.5 in||23.7 oz||650||Y||Apr 2017||4,499||Sony A9|
|Sony A99 II« »||5.6 in||4.1 in||3.0 in||29.9 oz||490||Y||Sep 2016||3,199||Sony A99 II|
|Sony A7S II« »||5.0 in||3.8 in||2.4 in||22.1 oz||370||Y||Sep 2015||2,999||Sony A7S II|
|Sony RX100 III« »||4.0 in||2.3 in||1.6 in||10.2 oz||320||n||May 2014||799||Sony RX100 III|
|Sony RX10« »||5.1 in||3.5 in||4.0 in||28.7 oz||420||Y||Oct 2013||1,299||Sony RX10|
|Sony RX100 II« »||4.0 in||2.3 in||1.5 in||9.9 oz||350||n||Jun 2013||749||Sony RX100 II|
|Sony A99« »||5.8 in||4.4 in||3.1 in||28.6 oz||500||Y||Sep 2012||2,799||Sony A99|
|Sony A850« »||6.1 in||4.6 in||3.2 in||31.6 oz||880||Y||Aug 2009||1,999||Sony A850|
|Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.|
Any camera decision will obviously take relative prices into account. 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 RX100 was launched at a lower price than the A900, despite having a lens built in. 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 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. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Sony A900 features a full frame sensor and the Sony RX100 an one-inch sensor. The sensor area in the RX100 is 87 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 2.7. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
With 24.4MP, the A900 offers a higher resolution than the RX100 (20MP), but the A900 nevertheless has larger individual pixels (pixel pitch of 5.94μm versus 2.41μm for the RX100) due to its larger sensor. However, the RX100 is a much more recent model (by 3 years and 8 months) than the A900, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels.
The resolution advantage of the Sony A900 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A900 for good quality output (200 dots per inch) amounts to 30.2 x 20.2 inch or 76.8 x 51.2 cm, for very good quality (250 dpi) 24.2 x 16.1 inch or 61.4 x 41 cm, and for excellent quality (300 dpi) 20.2 x 13.4 inch or 51.2 x 34.1 cm. The corresponding values for the Sony RX100 are 27.4 x 18.2 inch or 69.5 x 46.3 cm for good quality, 21.9 x 14.6 inch or 55.6 x 37.1 cm for very good quality, and 18.2 x 12.2 inch or 46.3 x 30.9 cm for excellent quality prints.
The Sony Alpha A900 has a native sensitivity range from ISO 200 to ISO 3200, which can be extended to ISO 100-6400. The corresponding ISO settings for the Sony Cyber-shot DSC-RX100 are ISO 100 to ISO 6400, with the possibility to increase the ISO range to 100-25600.
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 A900 provides substantially higher image quality than the RX100, with an overall score that is 13 points higher. This advantage is based on 1.1 bits higher color depth, 0.1 EV of lower dynamic range, and 1.9 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.
|Sony A900||Full Frame||24.4||6048||4032||none||23.7||12.3||1431||79||Sony A900|
|Sony RX100||1-inch||20.0||5472||3648||1080/60p||22.6||12.4||390||66||Sony RX100|
|Canon G9 X Mark II||1-inch||20.0||5472||3648||1080/60p||21.9||12.5||522||65||Canon G9 X Mark II|
|Canon G9 X||1-inch||20.0||5472||3648||1080/60p||21.5||12.3||495||63||Canon G9 X|
|Canon 5D Mark III||Full Frame||22.1||5760||3840||1080/30p||24.0||11.7||2293||81||Canon 5D Mark III|
|Canon 5D Mark II||Full Frame||21.0||5616||3744||1080/30p||23.7||11.9||1815||79||Canon 5D Mark II|
|Nikon D700||Full Frame||12.1||4256||2832||none||23.5||12.2||2303||80||Nikon D700|
|Panasonic S1||Full Frame||24.0||6000||4000||4K/60p||25.2||14.5||3333||95||Panasonic S1|
|Sony A7 III||Full Frame||24.0||6000||4000||4K/30p||25.0||14.7||3730||96||Sony A7 III|
|Sony A9||Full Frame||24.0||6000||4000||4K/30p||24.9||13.3||3517||92||Sony A9|
|Sony A99 II||Full Frame||42.2||7952||5304||4K/30p||25.4||13.4||2317||92||Sony A99 II|
|Sony A7S II||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85||Sony A7S II|
|Sony RX100 III||1-inch||20.0||5472||3648||1080/60p||22.4||12.3||495||67||Sony RX100 III|
|Sony RX10||1-inch||20.0||5472||3648||1080/60p||22.9||12.6||474||69||Sony RX10|
|Sony RX100 II||1-inch||20.0||5472||3648||1080/60p||22.5||12.4||483||67||Sony RX100 II|
|Sony A99||Full Frame||24.0||6000||4000||1080/60p||25.0||14.0||1555||89||Sony A99|
|Sony A850||Full Frame||24.4||6048||4032||none||23.8||12.2||1415||79||Sony A850|
Many modern cameras are not only capable of taking still images, but can also record movies. The RX100 indeed provides for movie recording, while the A900 does not. The highest resolution format that the RX100 can use is 1080/60p.
Apart from body and sensor, cameras can and do differ across a variety of features. For example, the A900 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the RX100 relies on live view and the rear LCD for framing. The table below summarizes some of the other core capabilities of the Sony A900 and Sony RX100 in connection with corresponding information for a sample of similar cameras.
|Sony A900||optical||Y||3.0||922||fixed||n||1/8000s||5.0||n||Y||Sony A900|
|Sony RX100||none||n||3.0||1229||fixed||n||1/2000s||10.0||Y||Y||Sony RX100|
|Canon G9 X Mark II||none||n||3.0||1040||fixed||Y||1/2000s||8.2||Y||Y||Canon G9 X Mark II|
|Canon G9 X||none||n||3.0||1040||fixed||Y||1/2000s||6.0||Y||Y||Canon G9 X|
|Canon 5D Mark III||optical||Y||3.2||1040||fixed||n||1/8000s||6.0||n||n||Canon 5D Mark III|
|Canon 5D Mark II||optical||Y||3.0||920||fixed||n||1/8000s||3.9||n||n||Canon 5D Mark II|
|Nikon D700||optical||Y||3.0||922||fixed||n||1/8000s||8.0||Y||n||Nikon D700|
|Panasonic S1||5760||Y||3.2||2100||full-flex||Y||1/8000s||9.0||n||Y||Panasonic S1|
|Sony A7 III||2359||n||3.0||922||tilting||Y||1/8000s||10.0||n||Y||Sony A7 III|
|Sony A9||3686||n||3.0||1440||tilting||Y||1/8000s||20.0||n||Y||Sony A9|
|Sony A99 II||2400||Y||3.0||1229||full-flex||n||1/8000s||12.0||n||Y||Sony A99 II|
|Sony A7S II||2400||n||3.0||1229||tilting||n||1/8000s||5.0||n||Y||Sony A7S II|
|Sony RX100 III||1440||n||3.0||1229||tilting||n||1/2000s||10.0||Y||Y||Sony RX100 III|
|Sony RX10||1440||Y||3.0||1229||tilting||n||1/3200s||10.0||Y||Y||Sony RX10|
|Sony RX100 II||optional||n||3.0||1229||tilting||n||1/2000s||10.0||Y||Y||Sony RX100 II|
|Sony A99||2359||Y||3.0||1229||full-flex||n||1/8000s||6.0||n||Y||Sony A99|
|Sony A850||optical||Y||3.0||922||fixed||n||1/8000s||3.0||n||Y||Sony A850|
One feature that is present on the A900, but is missing on the RX100 is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.
The A900 writes its imaging data to Compact Flash or Memory Stick PRO Duo cards, while the RX100 uses SDXC 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 RX100 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 A900 and Sony Cyber-shot DSC-RX100 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
|Sony A900||Y||none||none||-||-||mini||2.0||-||-||-||Sony A900|
|Sony RX100||-||stereo||mono||-||-||micro||2.0||-||-||-||Sony RX100|
|Canon G9 X Mark II||-||stereo||mono||-||-||micro||2.0||Y||Y||Y||Canon G9 X Mark II|
|Canon G9 X||-||stereo||mono||-||-||micro||2.0||Y||Y||-||Canon G9 X|
|Canon 5D Mark III||Y||mono||mono||Y||Y||mini||2.0||-||-||-||Canon 5D Mark III|
|Canon 5D Mark II||Y||mono||mono||Y||-||mini||2.0||-||-||-||Canon 5D Mark II|
|Nikon D700||Y||none||none||-||-||mini||2.0||-||-||-||Nikon D700|
|Panasonic S1||Y||stereo||mono||Y||Y||full||3.1||Y||-||Y||Panasonic S1|
|Sony A7 III||Y||stereo||mono||Y||Y||micro||3.1||Y||Y||Y||Sony A7 III|
|Sony A9||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||Y||Sony A9|
|Sony A99 II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||Y||Sony A99 II|
|Sony A7S II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony A7S II|
|Sony RX100 III||-||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony RX100 III|
|Sony RX10||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-||Sony RX10|
|Sony RX100 II||Y||stereo||mono||-||-||micro||2.0||Y||Y||-||Sony RX100 II|
|Sony A99||Y||stereo||mono||Y||Y||mini||2.0||-||-||-||Sony A99|
|Sony A850||Y||none||none||-||-||mini||2.0||-||-||-||Sony A850|
It is notable that the A900 has a hotshoe, while the RX100 does not. This socket makes it possible to easily attach optional accessories, such as an external flash gun.
Studio photographers will appreciate that the Sony A900 (unlike the RX100) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
Both the A900 and the RX100 have been discontinued, but can regularly be found used on eBay. The A900 was replaced by the Sony A99, while the RX100 was followed by the Sony RX100 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 how do things add up? Is there a clear favorite between the Sony A900 and the Sony RX100? Which camera is better? A synthesis of the relative strong points of each of the models is listed below.
Reasons to prefer the Sony Alpha A900:
- More detail: Offers more megapixels (24.4 vs 20MP) with a 11% higher linear resolution.
- Better image quality: Scores substantially higher (13 points) in the DXO overall assessment.
- Richer colors: Generates images with noticeably better colors (1.1 bits more color depth).
- Better low-light sensitivity: Requires less light for good images (1.9 stops ISO advantage).
- Easier framing: Has an optical viewfinder for image composition and settings control.
- Easier setting verification: Features an LCD display on top to control shooting parameters.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/2000s) to freeze action.
- More flexible: Can take a variety of interchangeable lenses, including specialty optics.
- Longer lasting: Can take more shots (880 versus 330) on a single battery charge.
- Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
- Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
- 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 available for much longer (launched in September 2008).
Advantages of the Sony Cyber-shot DSC-RX100:
- Broader imaging potential: Can capture not only stills but also 1080/60p video.
- More detailed LCD: Has a higher resolution rear screen (1229k vs 922k dots).
- Faster burst: Shoots at higher frequency (10 vs 5 flaps/sec) to capture the decisive moment.
- Ready to shoot: Comes with an integrated lens, while the A900 requires a separate lens.
- More compact: Is smaller (102x58mm vs 156x117mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight even though it has a lens built in (unlike the A900).
- Easier travel charging: Can be conveniently charged via its USB port.
- Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
- More affordable: Was introduced at a lower price, despite coming with a built-in lens.
- More modern: Reflects 3 years and 8 months of technical progress since the A900 launch.
If the number of relative strengths (bullet points above) is taken as a guide, the A900 is the clear winner of the match-up (14 : 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 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 A900 and the Sony RX100 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Travel-Zoom 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 A900 or the RX100 perform in practice. 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.
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. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.
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 SX720 vs Sony RX100 II
- Nikon D4 vs Sony RX100 V
- Nikon D4S vs Sony RX100
- Olympus E-M10 vs Sony A900
- Olympus TG-4 vs Sony RX100 II
- Olympus TG-5 vs Sony RX100 II
- Panasonic GH1 vs Sony RX100
- Panasonic GH5 vs Sony RX100 VII
- Panasonic LX100 vs Sony RX100
- Sony RX0 vs Sony RX100
- Sony RX100 IV vs Zeiss ZX1
- Sony RX100 V vs YI M1
Specifications: Sony A900 vs Sony RX100
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 A900||Sony RX100|
|Camera Type||Digital single lens reflex||Fixed lens compact camera|
|Camera Lens||Sony A mount lenses||28-100mm f/1.8-4.9|
|Launch Date||September 2008||June 2012|
|Launch Price||USD 2999||USD 649|
|Sensor Specs||Sony A900||Sony RX100|
|Sensor Format||Full Frame Sensor||1" Sensor|
|Sensor Size||35.9 x 24.0 mm||13.2 x 8.8 mm|
|Sensor Area||861.6 mm2||116.16 mm2|
|Sensor Diagonal||43.2 mm||15.9 mm|
|Sensor Resolution||24.4 Megapixels||20 Megapixels|
|Image Resolution||6048 x 4032 pixels||5472 x 3648 pixels|
|Pixel Pitch||5.94 μm||2.41 μm|
|Pixel Density||2.83 MP/cm2||17.18 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||no Video||1080/60p Video|
|ISO Setting||200-3200 ISO||100-6400 ISO|
|ISO Boost||100-6400 ISO||100-25600 ISO|
|Image Processor||BIONZ||BIONZ X|
|DXO Sensor Quality (score)||79||66|
|DXO Color Depth (bits)||23.7||22.6|
|DXO Dynamic Range (EV)||12.3||12.4|
|DXO Low Light (ISO)||1431||390|
|Screen Specs||Sony A900||Sony RX100|
|Viewfinder Type||Optical viewfinder||No viewfinder|
|Viewfinder Field of View||100%|
|Top-Level Screen||Control Panel||no Top Display|
|LCD Framing||Live View|
|Rear LCD Size||3.0 inch||3.0 inch|
|LCD Resolution||922k dots||1229k dots|
|LCD Attachment||Fixed screen||Fixed screen|
|Shooting Specs||Sony A900||Sony RX100|
|Autofocus System||Phase-detect AF||Contrast-detect AF|
|Manual Focusing Aid||No Peaking Feature||Focus Peaking|
|Max Shutter Speed (mechanical)||1/8000/s||1/2000/s|
|Continuous Shooting||5 shutter flaps/s||10 shutter flaps/s|
|Image Stabilization||In-body stabilization||Lens-based stabilization|
|Fill Flash||no On-Board Flash||Build-in Flash|
|Storage Medium||CF or MS cards||MS or SDXC cards|
|Second Storage Option||Dual card slots||Single card slot|
|Connectivity Specs||Sony A900||Sony RX100|
|External Flash||Hotshoe||no Hotshoe|
|Studio Flash||PC Sync socket||no PC Sync|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||micro HDMI|
|Wifi Support||no Wifi||no Wifi|
|Body Specs||Sony A900||Sony RX100|
|Environmental Sealing||Weathersealed body||Not weather sealed|
|Battery Life (CIPA)||880 shots per charge||330 shots per charge|
|In-Camera Charging||no USB charging||USB charging|
156 x 117 x 82 mm
(6.1 x 4.6 x 3.2 in)
102 x 58 x 36 mm
(4.0 x 2.3 x 1.4 in)
|Camera Weight||895 g (31.6 oz)||240 g (8.5 oz)|
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