Sony A7S vs RX100 IV
The Sony Alpha A7S and the Sony Cyber-shot DSC-RX100 IV are two digital cameras that were officially introduced, respectively, in April 2014 and June 2015. The A7S is a mirrorless interchangeable lens camera, while the RX100 IV is a fixed lens compact. The cameras are based on a full frame (A7S) and an one-inch (RX100 IV) sensor. The A7S has a resolution of 12 megapixels, whereas the RX100 IV provides 20 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 A7S and the Sony Cyber-shot DSC-RX100 IV? 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 A7S and the Sony RX100 IV is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side 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 RX100 IV is considerably smaller (50 percent) than the Sony A7S. It is worth mentioning in this context that the A7S is splash and dust resistant, while the RX100 IV does not feature any corresponding weather-sealing.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the RX100 IV has a lens built in, whereas the A7S is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the A7S and their specifications in the Sony FE Lens Catalog.
Concerning battery life, the A7S gets 380 shots out of its NP-FW50 battery, while the RX100 IV can take 280 images on a single charge of its NP-BX1 power pack. The battery packs of both cameras can be charged via USB, 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. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.
|1.||Sony A7S||5.0 in||3.7 in||1.9 in||17.2 oz||380||Y||Apr 2014||2,499|
|2.||Sony RX100 IV||4.0 in||2.3 in||1.6 in||10.5 oz||280||n||Jun 2015||999|
|3.||Canon G7 X||4.1 in||2.4 in||1.6 in||10.7 oz||210||n||Sep 2014||699|
|4.||Nikon Df||5.7 in||4.3 in||2.6 in||26.8 oz||1400||Y||Nov 2013||2,749|
|5.||Nikon D700||5.8 in||4.8 in||3.0 in||37.9 oz||1000||Y||Jul 2008||2,999|
|6.||Panasonic FZ1000||5.4 in||3.9 in||5.2 in||29.3 oz||360||n||Jun 2014||899|
|7.||Sony RX100 VII||4.0 in||2.3 in||1.7 in||10.7 oz||260||n||Jul 2019||1,199|
|8.||Sony RX100 V||4.0 in||2.3 in||1.6 in||10.5 oz||220||n||Oct 2016||999|
|9.||Sony A7R II||5.0 in||3.8 in||2.4 in||22.0 oz||290||Y||Jun 2015||3,199|
|10.||Sony A7S II||5.0 in||3.8 in||2.4 in||22.1 oz||370||Y||Sep 2015||2,999|
|11.||Sony RX1R II||4.4 in||2.6 in||2.8 in||17.9 oz||220||n||Oct 2015||3,299|
|12.||Sony A7 II||5.0 in||3.8 in||2.4 in||21.1 oz||350||Y||Nov 2014||1,999|
|13.||Sony RX100 III||4.0 in||2.3 in||1.6 in||10.2 oz||320||n||May 2014||799|
|14.||Sony A7||5.0 in||3.7 in||1.9 in||16.7 oz||340||Y||Oct 2013||1,699|
|15.||Sony A7R||5.0 in||3.7 in||1.9 in||16.4 oz||340||Y||Oct 2013||2,299|
|16.||Sony RX1R||4.4 in||2.6 in||2.8 in||17.0 oz||270||n||Jun 2013||2,799|
|17.||Sony RX1||4.4 in||2.6 in||2.8 in||17.0 oz||270||n||Sep 2012||2,799|
|Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
Any camera decision will obviously take relative prices into account. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The RX100 IV was launched at a lower price than the A7S, despite having a lens built in. 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. 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. 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.
Of the two cameras under consideration, the Sony A7S features a full frame sensor and the Sony RX100 IV an one-inch sensor. The sensor area in the RX100 IV is 86 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.
Despite having a smaller sensor, the RX100 IV offers a higher resolution of 20 megapixels, compared with 12 MP of the A7S. 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 2.41μm versus 8.45μm for the A7S). However, it should be noted that the RX100 IV is a somewhat more recent model (by 1 year and 2 months) than the A7S, and its sensor might have benefitted from technological advances during this time that partly offset its pixel-size disadvantage.
The resolution advantage of the Sony RX100 IV implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the RX100 IV for good quality output (200 dots per inch) amounts to 27.4 x 18.2 inches or 69.5 x 46.3 cm, for very good quality (250 dpi) 21.9 x 14.6 inches or 55.6 x 37.1 cm, and for excellent quality (300 dpi) 18.2 x 12.2 inches or 46.3 x 30.9 cm. The corresponding values for the Sony A7S are 21.2 x 14.2 inches or 53.8 x 36 cm for good quality, 17 x 11.3 inches or 43.1 x 28.8 cm for very good quality, and 14.1 x 9.4 inches or 35.9 x 24 cm for excellent quality prints.
The Sony Alpha A7S has a native sensitivity range from ISO 100 to ISO 102400, which can be extended to ISO 50-409600. The corresponding ISO settings for the Sony Cyber-shot DSC-RX100 IV are ISO 125 to ISO 12800, with the possibility to increase the ISO range to 80-25600.
For many cameras, data on sensor performance has been reported by DXO Mark. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under review, the A7S provides substantially higher image quality than the RX100 IV, with an overall score that is 17 points higher. This advantage is based on 1.1 bits higher color depth, 0.6 EV in additional dynamic range, and 2.6 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.
| DXO |
|1.||Sony A7S||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87|
|2.||Sony RX100 IV||1-inch||20.0||5472||3648||4K/30p||22.8||12.6||591||70|
|3.||Canon G7 X||1-inch||20.0||5472||3648||1080/60p||23.0||12.7||556||71|
|4.||Nikon Df||Full Frame||16.2||4928||3280||none||24.6||13.1||3279||89|
|5.||Nikon D700||Full Frame||12.1||4256||2832||none||23.5||12.2||2303||80|
|7.||Sony RX100 VII||1-inch||20.0||5472||3648||4K/30p||21.8||12.4||418||63|
|8.||Sony RX100 V||1-inch||20.0||5472||3648||4K/30p||22.8||12.4||586||70|
|9.||Sony A7R II||Full Frame||42.2||7952||5304||4K/30p||26.0||13.9||3434||98|
|10.||Sony A7S II||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|11.||Sony RX1R II||Full Frame||42.2||7952||5304||1080/60p||25.8||13.9||3204||97|
|12.||Sony A7 II||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|13.||Sony RX100 III||1-inch||20.0||5472||3648||1080/60p||22.4||12.3||495||67|
|14.||Sony A7||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90|
|15.||Sony A7R||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
|16.||Sony RX1R||Full Frame||24.0||6000||4000||1080/60p||25.0||13.6||2537||91|
|17.||Sony RX1||Full Frame||24.0||6000||4000||1080/60p||25.1||14.3||2534||93|
Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the RX100 IV provides a better video resolution than the A7S. It can shoot movie footage at 4K/30p, while the A7S is limited to 1080/60p.
Apart from body and sensor, cameras can and do differ across a range of features. The two cameras under consideration are similar with respect to both having an electronic viewfinder. However, the one in the A7S offers a slightly higher resolution than the one in the RX100 IV (2400k vs 2359k dots). The adjacent table lists some of the other core features of the Sony A7S and Sony RX100 IV along with similar information for a selection of comparators.
|2.||Sony RX100 IV||2359||n||3.0||1228||tilting||n||1/2000s||16.0||Y||Y|
|3.||Canon G7 X||none||n||3.0||1040||tilting||Y||1/2000s||6.5||Y||Y|
|7.||Sony RX100 VII||2359||n||3.0||921||tilting||Y||1/2000s||90.0||Y||Y|
|8.||Sony RX100 V||2359||n||3.0||1229||tilting||n||1/2000s||24.0||Y||Y|
|9.||Sony A7R II||2400||n||3.0||1229||tilting||n||1/8000s||5.0||n||Y|
|10.||Sony A7S II||2400||n||3.0||1229||tilting||n||1/8000s||5.0||n||Y|
|11.||Sony RX1R II||2360||n||3.0||1229||tilting||n||1/4000s||5.0||n||n|
|12.||Sony A7 II||2400||n||3.0||1230||tilting||n||1/8000s||5.0||n||Y|
|13.||Sony RX100 III||1440||n||3.0||1229||tilting||n||1/2000s||10.0||Y||Y|
One difference between the cameras concerns the presence of an on-board flash. The RX100 IV has one, while the A7S does not. While the built-in flash of the RX100 IV is not very powerful, it can at times be useful as a fill-in light.The RX100 IV has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the A7S 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, both cameras under consideration feature an 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 A7S and the RX100 IV 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 A7S and Sony Cyber-shot DSC-RX100 IV and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
| NFC |
|2.||Sony RX100 IV||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
|3.||Canon G7 X||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
|7.||Sony RX100 VII||-||stereo||mono||Y||-||micro||2.0||Y||Y||Y|
|8.||Sony RX100 V||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
|9.||Sony A7R II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-|
|10.||Sony A7S II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-|
|11.||Sony RX1R II||Y||stereo||mono||Y||-||micro||2.0||Y||Y||-|
|12.||Sony A7 II||Y||stereo||mono||Y||Y||micro||2.0||Y||Y||-|
|13.||Sony RX100 III||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
It is notable that the A7S has a hotshoe, while the RX100 IV does not. This socket makes it possible to easily attach optional accessories, such as an external flash gun.
Both the A7S and the RX100 IV have been discontinued, but can regularly be found used on eBay. The A7S was replaced by the Sony A7S II, while the RX100 IV was followed by the Sony RX100 IV. 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 is the bottom line? Is the Sony A7S better than the Sony RX100 IV or vice versa? Below is a summary of the relative strengths of each of the two contestants.
Arguments in favor of the Sony Alpha A7S:
- Better image quality: Scores substantially higher (17 points) in the DXO overall assessment.
- Richer colors: Generates images with noticeably better colors (1.1 bits more color depth).
- More dynamic range: Captures a larger spectrum of light and dark details (0.6 EV of extra DR).
- Better low-light sensitivity: Requires less light for good images (2.6 stops ISO advantage).
- Better sound: Can connect to an external microphone for higher quality sound recording.
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.71x vs 0.22x).
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/2000s) to freeze action.
- More flexible: Accepts interchangeable lenses, so that lens characteristics can be altered.
- Longer lasting: Can take more shots (380 versus 280) 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.
- More heavily discounted: Has been on the market for longer (launched in April 2014).
Advantages of the Sony Cyber-shot DSC-RX100 IV:
- More detail: Has more megapixels (20 vs 12MP), which boosts linear resolution by 29%.
- Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
- More detailed LCD: Has a higher resolution rear screen (1228k vs 921k dots).
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Faster burst: Shoots at higher frequency (16 vs 5 flaps/sec) to capture the decisive moment.
- Ready to shoot: Has an integrated lens, whereas the A7S necessitates an extra lens.
- More compact: Is smaller (102x58mm vs 127x94mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight even though it has a lens built in (unlike the A7S).
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
- 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: Was introduced somewhat (1 year and 2 months) more recently.
If the number of relative strengths (bullet points above) is taken as a guide, the A7S comes out slightly ahead of the RX100 IV (13 : 12 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 A7S and the Sony RX100 IV place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens 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 partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the A7S or the RX100 IV. 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 A7S||4/5||..||86/100||4.5/5||5/5||Apr 2014||2,499|
|2.||Sony RX100 IV||4.5/5||+ +||85/100||4/5||4.5/5||Jun 2015||999|
|3.||Canon G7 X||4/5||+ +||77/100||4.5/5||4.5/5||Sep 2014||699|
|4.||Nikon Df||4/5||..||81/100||4/5||4/5||Nov 2013||2,749|
|5.||Nikon D700||..||89/100||+ +||4.5/5||4.5/5||Jul 2008||2,999|
|6.||Panasonic FZ1000||4/5||+ +||82/100||4.5/5||4.5/5||Jun 2014||899|
|7.||Sony RX100 VII||4.5/5||..||..||4/5||5/5||Jul 2019||1,199|
|8.||Sony RX100 V||4.5/5||+ +||83/100||4/5||4.5/5||Oct 2016||999|
|9.||Sony A7R II||5/5||+ +||90/100||5/5||5/5||Jun 2015||3,199|
|10.||Sony A7S II||5/5||+||..||4.5/5||5/5||Sep 2015||2,999|
|11.||Sony RX1R II||5/5||..||82/100||..||4.5/5||Oct 2015||3,299|
|12.||Sony A7 II||5/5||+||82/100||4.5/5||5/5||Nov 2014||1,999|
|13.||Sony RX100 III||5/5||+ +||82/100||4.5/5||5/5||May 2014||799|
|14.||Sony A7||5/5||+ +||80/100||5/5||5/5||Oct 2013||1,699|
|15.||Sony A7R||5/5||+ +||82/100||4.5/5||5/5||Oct 2013||2,299|
|16.||Sony RX1R||5/5||..||..||4/5||4.5/5||Jun 2013||2,799|
|17.||Sony RX1||5/5||..||79/100||4/5||4.5/5||Sep 2012||2,799|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The above review scores should be interpreted with care, 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.
Other camera comparisons
Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes 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 A7S vs Sony RX100 IV
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 A7S||Sony RX100 IV|
|Camera Type||Mirrorless system camera||Fixed lens compact camera|
|Camera Lens||Sony E mount lenses||24-70mm f/1.8-2.8|
|Launch Date||April 2014||June 2015|
|Launch Price||USD 2,499||USD 999|
|Sensor Specs||Sony A7S||Sony RX100 IV|
|Sensor Format||Full Frame Sensor||1" Sensor|
|Sensor Size||35.8 x 23.9 mm||13.2 x 8.8 mm|
|Sensor Area||855.62 mm2||116.16 mm2|
|Sensor Diagonal||43 mm||15.9 mm|
|Sensor Resolution||12 Megapixels||20 Megapixels|
|Image Resolution||4240 x 2832 pixels||5472 x 3648 pixels|
|Pixel Pitch||8.45 μm||2.41 μm|
|Pixel Density||1.40 MP/cm2||17.18 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/60p Video||4K/30p Video|
|ISO Setting||100 - 102,400 ISO||125 - 12,800 ISO|
|ISO Boost||50 - 409,600 ISO||80 - 25,600 ISO|
|Image Processor||BIONZ X||BIONZ X|
|DXO Sensor Quality (score)||87||70|
|DXO Color Depth (bits)||23.9||22.8|
|DXO Dynamic Range (EV)||13.2||12.6|
|DXO Low Light (ISO)||3702||591|
|Screen Specs||Sony A7S||Sony RX100 IV|
|Viewfinder Type||Electronic viewfinder||Electronic viewfinder|
|Viewfinder Field of View||100%||100%|
|Viewfinder Resolution||2400k dots||2359k dots|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||921k dots||1228k dots|
|LCD Attachment||Tilting screen||Tilting screen|
|Shooting Specs||Sony A7S||Sony RX100 IV|
|Focus System||Contrast-detect AF||Contrast-detect AF|
|Manual Focusing Aid||Focus Peaking||Focus Peaking|
|Max Shutter Speed (mechanical)||1/8000s||1/2000s|
|Continuous Shooting||5 shutter flaps/s||16 shutter flaps/s|
|Electronic Shutter||YES||up to 1/32000s|
|Fill Flash||no On-Board Flash||Build-in 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 A7S||Sony RX100 IV|
|External Flash||Hotshoe||no Hotshoe|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||micro HDMI||micro HDMI|
|Microphone Port||External MIC port||no MIC socket|
|Headphone Socket||Headphone port||no Headphone port|
|Wifi Support||Wifi built-in||Wifi built-in|
|Near-Field Communication||NFC built-in||NFC built-in|
|Body Specs||Sony A7S||Sony RX100 IV|
|Environmental Sealing||Weathersealed body||not weather sealed|
|Battery Life (CIPA)||380 shots per charge||280 shots per charge|
|In-Camera Charging||USB charging||USB charging|
127 x 94 x 48 mm
(5.0 x 3.7 x 1.9 in)
102 x 58 x 41 mm
(4.0 x 2.3 x 1.6 in)
|Camera Weight||489 g (17.2 oz)||298 g (10.5 oz)|
Did you notice an error on this page? If so, please get in touch, so that we can correct the information.