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Sony A7S vs RX100 III

The Sony Alpha A7S and the Sony Cyber-shot DSC-RX100 III are two digital cameras that were officially introduced, respectively, in April 2014 and May 2014. The A7S is a mirrorless interchangeable lens camera, while the RX100 III is a fixed lens compact. The cameras are based on a full frame (A7S) and an one-inch (RX100 III) sensor. The A7S has a resolution of 12 megapixels, whereas the RX100 III provides 20 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Sony A7S   Sony RX100 III
Sony A7S Sony RX100 III
Mirrorless system camera Fixed lens compact camera
Sony E mount lenses 24-70mm f/1.8-2.8
12 MP, Full Frame Sensor 20 MP, 1" Sensor
1080/60p Video 1080/60p Video
ISO 100-102400 (50-409600) ISO 100-12800 (80-25600)
Electronic viewfinder (2400k dots) Electronic viewfinder (1440k dots)
3.0" LCD, 921k dots 3.0" LCD, 1229k dots
Tilting screen (no touchscreen) Tilting screen (not touch-sensitive)
5 shutter flaps per second 10 shutter flaps per second
Weathersealed bodyNot weather sealed
380 shots per battery charge320 shots per battery charge
127 x 94 x 48 mm, 489 g 102 x 58 x 41 mm, 290 g

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 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: Sony A7S vs RX100 III

An illustration of the physical size and weight of the Sony A7S and the Sony RX100 III 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.

Size Sony A7S vs Sony RX100 III
Compare A7S versus RX100 III top
Comparison A7S or RX100 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony RX100 III 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 III does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the RX100 III 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 III can take 320 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, just click on the right or left arrow next to the camera that you would like to inspect. Alternatively, you can also use the CAM-parator to select your camera combination among a larger number of options.

Camera Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Sony A7S» 5.0 in 3.7 in 1.9 in 17.2 oz 380 Y Apr 2014 2,499- i Sony A7S
 
Sony RX100 III« 4.0 in 2.3 in 1.6 in 10.2 oz 320 n May 2014 799- i Sony RX100 III
 
Canon G5 X« » 4.4 in 3.0 in 1.7 in 12.5 oz 210 n Oct 2015 799 i i Canon G5 X
 
Canon G7 X« » 4.1 in 2.4 in 1.6 in 10.7 oz 210 n Sep 2014 699- i Canon G7 X
 
Nikon Df« » 5.7 in 4.3 in 2.6 in 26.8 oz 1400 Y Nov 2013 2,749 i i Nikon Df
 
Nikon D700« » 5.8 in 4.8 in 3.0 in 37.9 oz 1000 Y Jul 2008 2,999- i Nikon D700
 
Sony A7R II« » 5.0 in 3.8 in 2.4 in 22.0 oz 290 Y Jun 2015 3,199- i Sony A7R II
 
Sony A7S II« » 5.0 in 3.8 in 2.4 in 22.1 oz 370 Y Sep 2015 2,999 i i Sony A7S II
 
Sony RX1R II« » 4.4 in 2.6 in 2.8 in 17.9 oz 220 n Oct 2015 3,299 i i Sony RX1R II
 
Sony RX100 IV« » 4.0 in 2.3 in 1.6 in 10.5 oz 280 n Jun 2015 999- i Sony RX100 IV
 
Sony A7 II« » 5.0 in 3.8 in 2.4 in 21.1 oz 350 Y Nov 2014 1,999- i Sony A7 II
 
Sony A7« » 5.0 in 3.7 in 1.9 in 16.7 oz 340 Y Oct 2013 1,699- i Sony A7
 
Sony A7R« » 5.0 in 3.7 in 1.9 in 16.4 oz 340 Y Oct 2013 2,299- i Sony A7R
 
Sony RX1R« » 4.4 in 2.6 in 2.8 in 17.0 oz 270 n Jun 2013 2,799- i Sony RX1R
 
Sony RX100 II« » 4.0 in 2.3 in 1.5 in 9.9 oz 350 n Jun 2013 749- i Sony RX100 II
 
Sony RX1« » 4.4 in 2.6 in 2.8 in 17.0 oz 270 n Sep 2012 2,799- i Sony RX1
 
Sony RX100« » 4.0 in 2.3 in 1.4 in 8.5 oz 330 n Jun 2012 649- i Sony RX100
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 listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The RX100 III 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.

 

Sensor comparison: Sony A7S vs RX100 III

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 III an one-inch sensor. The sensor area in the RX100 III 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.

Sony A7S and Sony RX100 III sensor measures

Despite having a smaller sensor, the RX100 III 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). It is noteworthy in this context that the two cameras were released in close succession, so that their sensors are from the same technological generation.

The resolution advantage of the Sony RX100 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the RX100 III for good quality output (200 dots per inch) amounts to 27.4 x 18.2 inch or 69.5 x 46.3 cm, for very good quality (250 dpi) 21.9 x 14.6 inch or 55.6 x 37.1 cm, and for excellent quality (300 dpi) 18.2 x 12.2 inch or 46.3 x 30.9 cm. The corresponding values for the Sony A7S are 21.2 x 14.2 inch or 53.8 x 36 cm for good quality, 17 x 11.3 inch or 43.1 x 28.8 cm for very good quality, and 14.1 x 9.4 inch 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 III are ISO 100 to ISO 12800, with the possibility to increase the ISO range to 80-25600.

A7S versus RX100 III MP

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 III, with an overall score that is 20 points higher. This advantage is based on 1.5 bits higher color depth, 0.9 EV in additional dynamic range, and 2.9 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.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
 
Sony A7S» Full Frame 12.0 4240 28321080/60p23.913.2370287Sony A7S
 
Sony RX100 III« 1-inch 20.0 5472 36481080/60p22.412.349567Sony RX100 III
 
Canon G5 X« » 1-inch 20.0 5472 36481080/60p----Canon G5 X
 
Canon G7 X« » 1-inch 20.0 5472 36481080/60p23.012.755671Canon G7 X
 
Nikon Df« » Full Frame 16.2 4928 3280-24.613.1327989Nikon Df
 
Nikon D700« » Full Frame 12.1 4256 2832-23.512.2230380Nikon D700
 
Sony A7R II« » Full Frame 42.2 7952 53044K/30p26.013.9343498Sony A7R II
 
Sony A7S II« » Full Frame 12.0 4240 28324K/30p23.613.3299385Sony A7S II
 
Sony RX1R II« » Full Frame 42.2 7952 53041080/60p25.813.9320497Sony RX1R II
 
Sony RX100 IV« » 1-inch 20.0 5472 36484K/30p22.812.659170Sony RX100 IV
 
Sony A7 II« » Full Frame 24.0 6000 40001080/60p24.913.6244990Sony A7 II
 
Sony A7« » Full Frame 24.0 6000 40001080/60p24.814.2224890Sony A7
 
Sony A7R« » Full Frame 36.2 7360 49121080/60p25.614.1274695Sony A7R
 
Sony RX1R« » Full Frame 24.0 6000 40001080/60p25.013.6253791Sony RX1R
 
Sony RX100 II« » 1-inch 20.0 5472 36481080/60p22.512.448367Sony RX100 II
 
Sony RX1« » Full Frame 24.0 6000 40001080/60p25.114.3253493Sony RX1
 
Sony RX100« » 1-inch 20.0 5472 36481080/60p22.612.439066Sony RX100

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, and both provide the same movie specifications (1080/60p).

 

Feature comparison: Sony A7S vs RX100 III

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 substantially higher resolution than the one in the RX100 III (2400k vs 1440k dots). The adjacent table lists some of the other core features of the Sony A7S and Sony RX100 III along with similar information for a selection of comparators.

Core Features
  Camera
Model
Viewfinder
(Type or
'000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
Camera
Model
 
Sony A7S»2400 n 3.0 921 tilting n 1/8000s 5.0 n n Sony A7S
 
Sony RX100 III«1440 n 3.0 1229 tilting n 1/2000s 10.0 Y Y Sony RX100 III
 
Canon G5 X« »2360 n 3.0 1040 swivel Y 1/2000s 5.9 Y Y Canon G5 X
 
Canon G7 X« »- n 3.0 1040 tilting Y 1/2000s 6.5 Y Y Canon G7 X
 
Nikon Df« »optical Y 3.2 921 fixed n 1/4000s 5.5 n n Nikon Df
 
Nikon D700« »optical Y 3.0 922 fixed n 1/8000s 8.0 Y n Nikon D700
 
Sony A7R II« »2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y Sony A7R II
 
Sony A7S II« »2400 n 3.0 1229 tilting n 1/8000s 5.0 n Y Sony A7S II
 
Sony RX1R II« »2360 n 3.0 1229 tilting n 1/4000s 5.0 n n Sony RX1R II
 
Sony RX100 IV« »2359 n 3.0 1228 tilting n 1/2000s 16.0 Y Y Sony RX100 IV
 
Sony A7 II« »2400 n 3.0 1230 tilting n 1/8000s 5.0 n Y Sony A7 II
 
Sony A7« »2400 n 3.0 1230 tilting n 1/8000s 5.0 n n Sony A7
 
Sony A7R« »2400 n 3.0 1230 tilting n 1/8000s 4.0 n n Sony A7R
 
Sony RX1R« »- n 3.0 1229 fixed n 1/4000s 5.0 Y n Sony RX1R
 
Sony RX100 II« »- n 3.0 1229 tilting n 1/2000s 10.0 Y Y Sony RX100 II
 
Sony RX1« »- n 3.0 1229 fixed n 1/4000s 5.0 Y n Sony RX1
 
Sony RX100« »- n 3.0 1229 fixed n 1/2000s 10.0 Y Y Sony RX100

One difference between the cameras concerns the presence of an on-board flash. The RX100 III has one, while the A7S does not. While the built-in flash of the RX100 III is not very powerful, it can at times be useful as a fill-in light.

The RX100 III 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, the A7S is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

Concerning the storage of imaging data, both the A7S and the RX100 III 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.

 

Connectivity comparison: Sony A7S vs RX100 III

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 III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Type
WiFi
Support
NFC
Support
Bluetooth
Support
Camera
Model
 
Sony A7S»YstereomonoYYmicro2.0YY-Sony A7S
 
Sony RX100 III«-stereomono--micro2.0YY-Sony RX100 III
 
Canon G5 X« »Ystereomono--mini2.0YY-Canon G5 X
 
Canon G7 X« »-stereomono--micro2.0YY-Canon G7 X
 
Nikon Df« »Y----mini2.0---Nikon Df
 
Nikon D700« »Y----mini2.0---Nikon D700
 
Sony A7R II« »YstereomonoYYmicro2.0YY-Sony A7R II
 
Sony A7S II« »YstereomonoYYmicro2.0YY-Sony A7S II
 
Sony RX1R II« »YstereomonoY-micro2.0YY-Sony RX1R II
 
Sony RX100 IV« »-stereomono--micro2.0YY-Sony RX100 IV
 
Sony A7 II« »YstereomonoYYmicro2.0YY-Sony A7 II
 
Sony A7« »YstereomonoYYmicro2.0YY-Sony A7
 
Sony A7R« »YstereomonoYYmicro2.0YY-Sony A7R
 
Sony RX1R« »YstereomonoY-mini2.0---Sony RX1R
 
Sony RX100 II« »Ystereomono--micro2.0YY-Sony RX100 II
 
Sony RX1« »YstereomonoY-mini2.0---Sony RX1
 
Sony RX100« »-stereomono--micro2.0---Sony RX100

It is notable that the A7S has a hotshoe, while the RX100 III does not. This socket makes it possible to easily attach optional accessories, such as an external flash gun.

Both the A7S and the RX100 III have been discontinued, but can regularly be found used on eBay. The A7S was replaced by the Sony A7S II, while the RX100 III 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.


Review summary: Sony A7S vs RX100 III

So what is the bottom line? Is the Sony A7S better than the Sony RX100 III 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 (20 points) in the DXO overall assessment.
  • Richer colors: Generates images with noticeably better colors (1.5 bits more color depth).
  • More dynamic range: Captures a larger spectrum of light and dark details (0.9 EV of extra DR).
  • Better low-light sensitivity: Requires less light for good images (2.9 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.
  • More detailed viewfinder: Has higher resolution electronic viewfinder (2400k vs 1440k dots).
  • 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.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More flexible: Accepts interchangeable lenses, so that lens characteristics can be altered.
  • Longer lasting: Can take more shots (380 versus 320) 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.


Advantages of the Sony Cyber-shot DSC-RX100 III:

  • More detail: Has more megapixels (20 vs 12MP), which boosts linear resolution by 29%.
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 921k dots).
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (10 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.

If the number of relative strengths (bullet points above) is taken as a guide, the A7S is the clear winner of the match-up (14 : 10 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.

A7S 14:10 RX100 III

How about other alternatives? Do the specifications of the Sony A7S and the Sony RX100 III 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 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: Sony A7S vs RX100 III

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 (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.

Review Scores
  Camera
Model
cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
 
Sony A7S»-86/1004.5/54.5/55/5 Apr 2014 2,499- i Sony A7S
 
Sony RX100 III«+ +82/1004.5/54.5/55/5 May 2014 799- i Sony RX100 III
 
Canon G5 X« »+ +78/1004.5/54/54.5/5 Oct 2015 799 i i Canon G5 X
 
Canon G7 X« »+ +77/1004.5/53.5/54.5/5 Sep 2014 699- i Canon G7 X
 
Nikon Df« »-81/1004/54/54/5 Nov 2013 2,749 i i Nikon Df
 
Nikon D700« »89/100+ +4.5/55/54.5/5 Jul 2008 2,999- i Nikon D700
 
Sony A7R II« »+ +90/1005/54.5/55/5 Jun 2015 3,199- i Sony A7R II
 
Sony A7S II« »+-4.5/55/55/5 Sep 2015 2,999 i i Sony A7S II
 
Sony RX1R II« »-82/100-o4.5/5 Oct 2015 3,299 i i Sony RX1R II
 
Sony RX100 IV« »+ +85/1004/54.5/54.5/5 Jun 2015 999- i Sony RX100 IV
 
Sony A7 II« »+82/1004.5/55/55/5 Nov 2014 1,999- i Sony A7 II
 
Sony A7« »+ +80/1005/54.5/55/5 Oct 2013 1,699- i Sony A7
 
Sony A7R« »+ +82/1004.5/55/55/5 Oct 2013 2,299- i Sony A7R
 
Sony RX1R« »--4/5o4.5/5 Jun 2013 2,799- i Sony RX1R
 
Sony RX100 II« »+ +79/1004.5/55/54.5/5 Jun 2013 749- i Sony RX100 II
 
Sony RX1« »-79/1004/54.5/54.5/5 Sep 2012 2,799- i Sony RX1
 
Sony RX100« »+ +78/1004/55/55/5 Jun 2012 649- i Sony RX100
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.

Sony A7S:
Check Ebay offers
Sony RX100 III:
Check Ebay offers

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.

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    Specifications: Sony A7S vs Sony RX100 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 Specifications
    Camera Model Sony A7S Sony RX100 III
    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 May 2014
    Launch Price USD 2499 USD 799
    Sensor Specs Sony A7S Sony RX100 III
    Sensor Technology CMOS BSI-CMOS
    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
    Crop Factor 1.0x 2.7x
    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 1080/60p Video
    ISO Setting 100-102400 ISO 100-12800 ISO
    ISO Boost 50-409600 ISO 80-25600 ISO
    Image Processor BIONZ X BIONZ X
    DXO Sensor Quality (score) 87 67
    DXO Color Depth (bits) 23.9 22.4
    DXO Dynamic Range (EV) 13.2 12.3
    DXO Low Light (ISO) 3702 495
    Screen Specs Sony A7S Sony RX100 III
    Viewfinder Type Electronic viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.71x 0.22x
    Viewfinder Resolution 2400k dots 1440k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0 inch 3.0 inch
    LCD Resolution 921k dots 1229k dots
    LCD Attachment Tilting screen Tilting screen
    Shooting Specs Sony A7S Sony RX100 III
    Autofocus System Contrast-detect AF Contrast-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000/s 1/2000/s
    Continuous Shooting 5 shutter flaps/s 10 shutter flaps/s
    Electronic ShutterYESno E-Shutter
    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 III
    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 III
    Environmental SealingWeathersealed bodyNot weather sealed
    Battery Type NP-FW50 power pack NP-BX1 power pack
    Battery Life (CIPA)380 shots per charge320 shots per charge
    In-Camera Charging USB charging USB charging
    Body Dimensions 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) 290 g (10.2 oz)

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