Sony A900 vs RX1R III
The Sony Alpha A900 and the Sony Cyber-shot DSC-RX1R III are two digital cameras that were announced, respectively, in September 2008 and July 2025. The A900 is a DSLR, while the RX1R III is a fixed lens compact. Both cameras are equipped with a full frame sensor. The A900 has a resolution of 24.4 megapixels, whereas the RX1R III provides 60.2 MP.
Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Check A900 offers at
ebay.com

Check RX1R III price at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha A900 and the Sony Cyber-shot DSC-RX1R III? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.
Body comparison
The physical size and weight of the Sony A900 and the Sony RX1R III are illustrated 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 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 RX1R III is considerably smaller (58 percent) than the Sony A900. 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 and possibly misleading, as the RX1R III 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 Sony NP-FM500H battery, while the RX1R III can take 300 images on a single charge of its Sony NP-FW50 power pack. The power pack in the RX1R III can be charged via the USB port, which can be very convenient 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.

| Camera Model |
Camera Width |
Camera Height |
Camera Depth |
Camera Weight |
Battery Life |
Weather Sealing |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Sony A900 | 156 mm | 117 mm | 82 mm | 895 g | 880 | Y | Sep 2008 | US$ 2 999 | ebay.com | |
| 2. | Sony RX1R III | 113 mm | 68 mm | 88 mm | 498 g | 300 | Y | Jul 2025 | US$ 5 099 | amazon.com | |
| 3. | Canon 5D Mark II | 152 mm | 114 mm | 75 mm | 850 g | 850 | Y | Sep 2008 | US$ 3 499 | ebay.com | |
| 4. | Canon 5D Mark III | 152 mm | 116 mm | 76 mm | 950 g | 950 | Y | Mar 2012 | US$ 3 499 | ebay.com | |
| 5. | Leica Q3 | 130 mm | 80 mm | 93 mm | 743 g | 350 | Y | May 2023 | US$ 5 999 | amazon.com | |
| 6. | Nikon D700 | 147 mm | 123 mm | 77 mm | 1074 g | 1000 | Y | Jul 2008 | US$ 2 999 | ebay.com | |
| 7. | Panasonic S1 | 149 mm | 110 mm | 97 mm | 1017 g | 400 | Y | Feb 2019 | US$ 2 499 | ebay.com | |
| 8. | Sony A7 | 127 mm | 94 mm | 48 mm | 474 g | 340 | Y | Oct 2013 | US$ 1 699 | ebay.com | |
| 9. | Sony A7 III | 127 mm | 96 mm | 74 mm | 650 g | 610 | Y | Feb 2018 | US$ 1 999 | amazon.com | |
| 10. | Sony A7R | 127 mm | 94 mm | 48 mm | 465 g | 340 | Y | Oct 2013 | US$ 2 299 | ebay.com | |
| 11. | Sony A7S | 127 mm | 94 mm | 48 mm | 489 g | 380 | Y | Apr 2014 | US$ 2 499 | ebay.com | |
| 12. | Sony A7S II | 127 mm | 96 mm | 60 mm | 627 g | 370 | Y | Sep 2015 | US$ 2 999 | ebay.com | |
| 13. | Sony A9 | 127 mm | 96 mm | 63 mm | 673 g | 650 | Y | Apr 2017 | US$ 4 499 | ebay.com | |
| 14. | Sony A99 | 147 mm | 111 mm | 78 mm | 812 g | 500 | Y | Sep 2012 | US$ 2 799 | ebay.com | |
| 15. | Sony A99 II | 143 mm | 104 mm | 76 mm | 849 g | 490 | Y | Sep 2016 | US$ 3 199 | ebay.com | |
| 16. | Sony A850 | 156 mm | 117 mm | 82 mm | 895 g | 880 | Y | Aug 2009 | US$ 1 999 | ebay.com | |
| 17. | Sony RX1R II | 113 mm | 65 mm | 72 mm | 507 g | 220 | n | Oct 2015 | US$ 3 299 | ebay.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 manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. 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 imaging sensor is a crucial determinant 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. 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 associated with larger, more expensive camera bodies and lenses.
Both cameras under consideration feature a full frame sensor, but their sensors differ slightly in size. The sensor area in the RX1R III is 1 percent smaller. They nevertheless have the same format factor of 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
Technology-wise, the RX1R III uses a more advanced image processing engine (BIONZ XR) than the A900 (BIONZ), with benefits for noise reduction, color accuracy, and processing speed.

Despite having a slightly smaller sensor, the RX1R III offers a higher resolution of 60.2 megapixels, compared with 24.4 MP of the A900. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.76μm versus 5.94μm for the A900). However, it should be noted that the RX1R III is much more recent (by 16 years and 10 months) than the A900, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. Coming back to sensor resolution, it should be mentioned that the RX1R III has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
The resolution advantage of the Sony RX1R III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the RX1R III for good quality output (200 dots per inch) amounts to 47.5 x 31.7 inches or 120.7 x 80.5 cm, for very good quality (250 dpi) 38 x 25.3 inches or 96.6 x 64.4 cm, and for excellent quality (300 dpi) 31.7 x 21.1 inches or 80.5 x 53.6 cm. The corresponding values for the Sony A900 are 30.2 x 20.2 inches or 76.8 x 51.2 cm for good quality, 24.2 x 16.1 inches or 61.4 x 41 cm for very good quality, and 20.2 x 13.4 inches or 51.2 x 34.1 cm for excellent quality prints.
The RX1R III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
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-RX1R III are ISO 100 to ISO 32000, with the possibility to increase the ISO range to 50-102400.
In terms of underlying technology, the A900 is build around a CMOS sensor, while the RX1R III uses a 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.

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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"). The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

| Camera Model |
Sensor Class |
Resolution (MP) |
Horiz. Pixels |
Vert. Pixels |
Video Format |
DXO Portrait |
DXO Landscape |
DXO Sports |
DXO Overall |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Sony A900 | Full Frame | 24.4 | 6048 | 4032 | none | 23.7 | 12.3 | 1431 | 79 | |
| 2. | Sony RX1R III | Full Frame | 60.2 | 9504 | 6336 | 4K/30p | 25.4 | 14.9 | 3417 | 97 | |
| 3. | Canon 5D Mark II | Full Frame | 21.0 | 5616 | 3744 | 1080/30p | 23.7 | 11.9 | 1815 | 79 | |
| 4. | Canon 5D Mark III | Full Frame | 22.1 | 5760 | 3840 | 1080/30p | 24.0 | 11.7 | 2293 | 81 | |
| 5. | Leica Q3 | Full Frame | 60.3 | 9528 | 6328 | 8K/30p | 25.4 | 14.7 | 3216 | 96 | |
| 6. | Nikon D700 | Full Frame | 12.1 | 4256 | 2832 | none | 23.5 | 12.2 | 2303 | 80 | |
| 7. | Panasonic S1 | Full Frame | 24.0 | 6000 | 4000 | 4K/60p | 25.2 | 14.5 | 3333 | 95 | |
| 8. | Sony A7 | Full Frame | 24.0 | 6000 | 4000 | 1080/60p | 24.8 | 14.2 | 2248 | 90 | |
| 9. | Sony A7 III | Full Frame | 24.0 | 6000 | 4000 | 4K/30p | 25.0 | 14.7 | 3730 | 96 | |
| 10. | Sony A7R | Full Frame | 36.2 | 7360 | 4912 | 1080/60p | 25.6 | 14.1 | 2746 | 95 | |
| 11. | Sony A7S | Full Frame | 12.0 | 4240 | 2832 | 1080/60p | 23.9 | 13.2 | 3702 | 87 | |
| 12. | Sony A7S II | Full Frame | 12.0 | 4240 | 2832 | 4K/30p | 23.6 | 13.3 | 2993 | 85 | |
| 13. | Sony A9 | Full Frame | 24.0 | 6000 | 4000 | 4K/30p | 24.9 | 13.3 | 3517 | 92 | |
| 14. | Sony A99 | Full Frame | 24.0 | 6000 | 4000 | 1080/60p | 25.0 | 14.0 | 1555 | 89 | |
| 15. | Sony A99 II | Full Frame | 42.2 | 7952 | 5304 | 4K/30p | 25.4 | 13.4 | 2317 | 92 | |
| 16. | Sony A850 | Full Frame | 24.4 | 6048 | 4032 | none | 23.8 | 12.2 | 1415 | 79 | |
| 17. | Sony RX1R II | Full Frame | 42.2 | 7952 | 5304 | 1080/60p | 25.8 | 13.9 | 3204 | 97 | |
| Note: DXO values in italics represent estimates based on sensor size and age. | |||||||||||
Many modern cameras are not only capable of taking still images, but can also record movies. The RX1R III indeed provides for movie recording, while the A900 does not. The highest resolution format that the RX1R III can use is 4K/30p.
Feature comparison
Apart from body and sensor, cameras can and do differ across a variety of features. For example, the RX1R III has an electronic viewfinder (2360k 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 RX1R III (0.74x vs 0.7x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Sony A900, the Sony RX1R III, and comparable cameras.

| 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. | Sony A900 | optical | Y | 3.0 / 922 | fixed | n | 1/8000s | 5.0/s | n | Y | |
| 2. | Sony RX1R III | 2360 | n | 3.0 / 2360 | fixed | Y | 1/4000s | 5.0/s | n | n | |
| 3. | Canon 5D Mark II | optical | Y | 3.0 / 920 | fixed | n | 1/8000s | 3.9/s | n | n | |
| 4. | Canon 5D Mark III | optical | Y | 3.2 / 1040 | fixed | n | 1/8000s | 6.0/s | n | n | |
| 5. | Leica Q3 | 5760 | n | 3.0 / 1840 | tilting | Y | 1/2000s | 15.0/s | n | Y | |
| 6. | Nikon D700 | optical | Y | 3.0 / 922 | fixed | n | 1/8000s | 8.0/s | Y | n | |
| 7. | Panasonic S1 | 5760 | Y | 3.2 / 2100 | full-flex | Y | 1/8000s | 9.0/s | n | Y | |
| 8. | Sony A7 | 2400 | n | 3.0 / 1230 | tilting | n | 1/8000s | 5.0/s | n | n | |
| 9. | Sony A7 III | 2359 | n | 3.0 / 922 | tilting | Y | 1/8000s | 10.0/s | n | Y | |
| 10. | Sony A7R | 2400 | n | 3.0 / 1230 | tilting | n | 1/8000s | 4.0/s | n | n | |
| 11. | Sony A7S | 2400 | n | 3.0 / 921 | tilting | n | 1/8000s | 5.0/s | n | n | |
| 12. | Sony A7S II | 2400 | n | 3.0 / 1229 | tilting | n | 1/8000s | 5.0/s | n | Y | |
| 13. | Sony A9 | 3686 | n | 3.0 / 1440 | tilting | Y | 1/8000s | 20.0/s | n | Y | |
| 14. | Sony A99 | 2359 | Y | 3.0 / 1229 | full-flex | n | 1/8000s | 6.0/s | n | Y | |
| 15. | Sony A99 II | 2400 | Y | 3.0 / 1229 | full-flex | n | 1/8000s | 12.0/s | n | Y | |
| 16. | Sony A850 | optical | Y | 3.0 / 922 | fixed | n | 1/8000s | 3.0/s | n | Y | |
| 17. | Sony RX1R II | 2360 | n | 3.0 / 1229 | tilting | n | 1/4000s | 5.0/s | n | n | |
| Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one. | |||||||||||
One feature that is present on the A900, but is missing on the RX1R III 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 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 RX1R III 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 Sony RX1R III has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.
The A900 writes its imaging data to Compact Flash or Memory Stick PRO Duo cards, while the RX1R III uses SDXC cards. The A900 features dual card slots, which can be very useful in case a memory card fails. In contrast, the RX1R III only has one slot.
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 Sony Alpha A900 and Sony Cyber-shot DSC-RX1R III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

| Camera Model |
Hotshoe Port |
Internal Mic / Speaker |
Microphone Port |
Headphone Port |
HDMI Port |
USB Port |
WiFi Support |
NFC Support |
Bluetooth Support |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Sony A900 | Y | - / - | - | - | mini | 2.0 | - | - | - | |
| 2. | Sony RX1R III | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 3. | Canon 5D Mark II | Y | mono / mono | Y | - | mini | 2.0 | - | - | - | |
| 4. | Canon 5D Mark III | Y | mono / mono | Y | Y | mini | 2.0 | - | - | - | |
| 5. | Leica Q3 | Y | stereo / mono | - | - | micro | 3.1 | Y | - | Y | |
| 6. | Nikon D700 | Y | - / - | - | - | mini | 2.0 | - | - | - | |
| 7. | Panasonic S1 | Y | stereo / mono | Y | Y | full | 3.1 | Y | - | Y | |
| 8. | Sony A7 | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | - | |
| 9. | Sony A7 III | Y | stereo / mono | Y | Y | micro | 3.1 | Y | Y | Y | |
| 10. | Sony A7R | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | - | |
| 11. | Sony A7S | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | - | |
| 12. | Sony A7S II | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | - | |
| 13. | Sony A9 | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | Y | |
| 14. | Sony A99 | Y | stereo / mono | Y | Y | mini | 2.0 | - | - | - | |
| 15. | Sony A99 II | Y | stereo / mono | Y | Y | micro | 2.0 | Y | Y | Y | |
| 16. | Sony A850 | Y | - / - | - | - | mini | 2.0 | - | - | - | |
| 17. | Sony RX1R II | Y | stereo / mono | Y | - | micro | 2.0 | Y | Y | - |
It is notable that the RX1R III offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the A900 does not provide wifi capability.
Studio photographers will appreciate that the Sony A900 (unlike the RX1R III) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.
The RX1R III 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.
Review summary
So what conclusions can be drawn? Is there a clear favorite between the Sony A900 and the Sony RX1R III? 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:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.74x vs 0.7x).
- Easier setting verification: Features an LCD display on top to control shooting parameters.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- More flexible: Can take a variety of interchangeable lenses, including specialty optics.
- Longer lasting: Can take more shots (880 versus 300) on a single battery charge.
- Sharper images: Has hand-shake reducing image stabilization built-in.
- 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).
Arguments in favor of the Sony Cyber-shot DSC-RX1R III:
- More detail: Has more megapixels (60.2 vs 24.4MP), which boosts linear resolution by 57%.
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- Better jpgs: Has a more modern image processing engine (BIONZ XR vs BIONZ).
- Broader imaging potential: Can capture not only stills but also 4K/30p video.
- 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 detailed LCD: Has a higher resolution rear screen (2360k vs 922k dots).
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Ready to shoot: Comes with an integrated lens, while the A900 requires a separate lens.
- More compact: Is smaller (113x68mm 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.
- Faster data transfer: Supports a more advanced USB protocol (3.2 vs 2.0).
- Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
- Easier wireless transfer: Supports Bluetooth for image sharing without cables.
- More modern: Reflects 16 years and 10 months of technical progress since the A900 launch.
If the count of individual advantages (bullet points above) is taken as a guide, the RX1R III is the clear winner of the contest (18 : 11 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.
How about other alternatives? Do the specifications of the Sony A900 and the Sony RX1R III place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Prime Lens Compact 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 partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the A900 or the RX1R III. 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 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], 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.

| Camera Model |
AP score |
CL score |
DCW score |
DPR score |
EPZ score |
PB score |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Sony A900 | .. | + + | .. | + + | 4.5/5 | 5/5 | Sep 2008 | US$ 2 999 | ebay.com | |
| 2. | Sony RX1R III | .. | .. | .. | .. | .. | .. | Jul 2025 | US$ 5 099 | amazon.com | |
| 3. | Canon 5D Mark II | 4/5 | 91/100 | .. | 79/100 | 4/5 | .. | Sep 2008 | US$ 3 499 | ebay.com | |
| 4. | Canon 5D Mark III | .. | + + | .. | 82/100 | 4.5/5 | 4.5/5 | Mar 2012 | US$ 3 499 | ebay.com | |
| 5. | Leica Q3 | 5/5 | .. | 4.5/5 | .. | .. | 4.5/5 | May 2023 | US$ 5 999 | amazon.com | |
| 6. | Nikon D700 | .. | 89/100 | .. | + + | 4.5/5 | 4.5/5 | Jul 2008 | US$ 2 999 | ebay.com | |
| 7. | Panasonic S1 | 4.5/5 | + + | 4.5/5 | 88/100 | 4.5/5 | 4/5 | Feb 2019 | US$ 2 499 | ebay.com | |
| 8. | Sony A7 | 5/5 | + + | .. | 80/100 | 5/5 | 5/5 | Oct 2013 | US$ 1 699 | ebay.com | |
| 9. | Sony A7 III | .. | + + | 4.5/5 | 89/100 | 5/5 | 5/5 | Feb 2018 | US$ 1 999 | amazon.com | |
| 10. | Sony A7R | 5/5 | + + | .. | 82/100 | 4.5/5 | 5/5 | Oct 2013 | US$ 2 299 | ebay.com | |
| 11. | Sony A7S | 4/5 | .. | .. | 86/100 | 4.5/5 | 5/5 | Apr 2014 | US$ 2 499 | ebay.com | |
| 12. | Sony A7S II | 5/5 | + | .. | .. | 4.5/5 | 5/5 | Sep 2015 | US$ 2 999 | ebay.com | |
| 13. | Sony A9 | 5/5 | + + | 4.8/5 | 89/100 | 5/5 | 5/5 | Apr 2017 | US$ 4 499 | ebay.com | |
| 14. | Sony A99 | 5/5 | .. | .. | 84/100 | 4.5/5 | 4.5/5 | Sep 2012 | US$ 2 799 | ebay.com | |
| 15. | Sony A99 II | .. | .. | 4.5/5 | 85/100 | 4.5/5 | 4.5/5 | Sep 2016 | US$ 3 199 | ebay.com | |
| 16. | Sony A850 | 3/5 | .. | .. | 75/100 | .. | 4.5/5 | Aug 2009 | US$ 1 999 | ebay.com | |
| 17. | Sony RX1R II | 5/5 | .. | .. | 82/100 | .. | 4.5/5 | Oct 2015 | US$ 3 299 | ebay.com | |
| Note: (+ +) 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 comparisons of ratings among very different cameras or across long time periods have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Check A900 offers at
ebay.com

Check RX1R III price at
amazon.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 make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.
- Canon G12 vs Sony A900
- Fujifilm X-T200 vs Sony RX1R III
- Leica X Typ 113 vs Sony A900
- Nikon D3300 vs Sony RX1R III
- Olympus E-450 vs Sony A900
- Olympus E-M1 vs Sony RX1R III
- Olympus XZ-1 vs Sony A900
- Panasonic GX1 vs Sony A900
- Panasonic S1 II vs Sony RX1R III
- Sony A7 vs Sony RX1R III
- Sony A7C vs Sony A900
- Sony A7R V vs Sony RX1R III
Specifications: Sony A900 vs Sony RX1R III
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 RX1R III |
|---|---|---|
| Camera Type | Digital single lens reflex | Fixed lens compact camera |
| Camera Lens | Sony A mount lenses | 35mm f/2.0 |
| Launch Date | September 2008 | July 2025 |
| Launch Price | USD 2,999 | USD 5,099 |
| Sensor Specs | Sony A900 | Sony RX1R III |
| Sensor Technology | CMOS | BSI-CMOS |
| Sensor Format | Full Frame Sensor | Full Frame Sensor |
| Sensor Size | 35.9 x 24.0 mm | 35.7 x 23.8 mm |
| Sensor Area | 861.6 mm2 | 849.66 mm2 |
| Sensor Diagonal | 43.2 mm | 42.9 mm |
| Crop Factor | 1.0x | 1.0x |
| Sensor Resolution | 24.4 Megapixels | 60.2 Megapixels |
| Image Resolution | 6048 x 4032 pixels | 9504 x 6336 pixels |
| Pixel Pitch | 5.94 μm | 3.76 μm |
| Pixel Density | 2.83 MP/cm2 | 7.09 MP/cm2 |
| Moiré control | Anti-Alias filter | no AA filter |
| Movie Capability | no Video | 4K/30p Video |
| ISO Setting | 200 - 3,200 ISO | 100 - 32,000 ISO |
| ISO Boost | 100 - 6,400 ISO | 50 - 102,400 ISO |
| Image Processor | BIONZ | BIONZ XR |
| DXO Sensor Quality (score) | 79 | .. |
| DXO Color Depth (bits) | 23.7 | .. |
| DXO Dynamic Range (EV) | 12.3 | .. |
| DXO Low Light (ISO) | 1431 | .. |
| Screen Specs | Sony A900 | Sony RX1R III |
| Viewfinder Type | Optical viewfinder | Electronic viewfinder |
| Viewfinder Field of View | 100% | 100% |
| Viewfinder Magnification | 0.74x | 0.7x |
| Viewfinder Resolution | 2360k dots | |
| Top-Level Screen | Control Panel | no Top Display |
| LCD Framing | Live View | |
| Rear LCD Size | 3.0inch | 3.0inch |
| LCD Resolution | 922k dots | 2360k dots |
| LCD Attachment | Fixed screen | Fixed screen |
| Touch Input | no Touchscreen | Touchscreen |
| Shooting Specs | Sony A900 | Sony RX1R III |
| Focus System | Phase-detect AF | On-Sensor Phase-detect |
| Manual Focusing Aid | no Peaking Feature | Focus Peaking |
| Max Shutter Speed (mechanical) | 1/8000s | 1/4000s |
| Continuous Shooting | 5 shutter flaps/s | 5 shutter flaps/s |
| Electronic Shutter | no E-Shutter | up to 1/8000s |
| Time-Lapse Photography | no Intervalometer | Intervalometer built-in |
| Image Stabilization | In-body stabilization | no handshake reduction |
| Fill Flash | no On-Board Flash | no On-Board Flash |
| Storage Medium | CF or MS cards | SDXC cards |
| Single or Dual Card Slots | Dual card slots | Single card slot |
| Connectivity Specs | Sony A900 | Sony RX1R III |
| External Flash | Hotshoe | Hotshoe |
| Studio Flash | PC Sync socket | no PC Sync |
| USB Connector | USB 2.0 | USB 3.2 |
| 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 |
| Bluetooth Support | no Bluetooth | Bluetooth built-in |
| Body Specs | Sony A900 | Sony RX1R III |
| Environmental Sealing | Weathersealed body | Weathersealed body |
| Battery Type | Sony NP-FM500H | Sony NP-FW50 |
| Battery Life (CIPA) | 880 shots per charge | 300 shots per charge |
| In-Camera Charging | no USB charging | USB charging |
| Body Dimensions |
156 x 117 x 82 mm (6.1 x 4.6 x 3.2 in) |
113 x 68 x 88 mm (4.4 x 2.7 x 3.5 in) |
| Camera Weight | 895 g (31.6 oz) | 498 g (17.6 oz) |

Check A900 offers at
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Check RX1R III price at
amazon.com
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