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Sony A7 versus Sony A7S

The Sony Alpha A7 and the Sony Alpha A7S are two digital cameras that were revealed to the public, respectively, in October 2013 and April 2014. Both the A7 and the A7S are mirrorless interchangeable lens cameras that are equipped with a full frame sensor. The A7 has a resolution of 24 megapixel, whereas the A7S provides 12 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.

Body comparison: Sony A7 vs Sony A7S

An illustration of the physical size and weight of the Sony A7 and the Sony A7S is provided in the side-by-side display below. Three successive views from the front, the top, and the rear are shown. All width, height and depth dimensions are rounded to the nearest millimeter. If you prefer, you can also use the toggle button to switch to a comparison in percentage terms (in this case, the camera on the left – the A7 – represents 100 percent across all the size and weight measures).

Snapsort Sony A7 vs Sony A7S
Compare A7 versus A7S top
Compare A7 and A7S rear

In this particular case, the Sony A7 and the Sony A7S have exactly the same width and height, and, thus, have identically-sized bodies. However, the A7S is slightly heavier (3 percent) than the A7. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. In this particular case, both cameras feature the same lens mount, so that they can use the same lenses. You can find an overview of suitable optics in the Sony FE Lens Catalog. Mirrorless cameras, such as the two under consideration, have the additional advantage of having a short flange to focal plane distance, which makes it possible to mount many lenses from other systems onto the camera via adapters.

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, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

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)
Sony A7» 5.0 in 3.7 in 1.9 in 16.7 oz 340 Y Oct 2013 1,699- i
Sony A7S« 5.0 in 3.7 in 1.9 in 17.2 oz 380 Y Apr 2014 2,499- i
Nikon D750« » 5.6 in 4.4 in 3.1 in 26.5 oz 1230 Y Sep 2014 2,299 i i
Nikon D610« » 5.6 in 4.4 in 3.2 in 30.0 oz 900 Y Oct 2013 1,999 i i
Nikon Df« » 5.7 in 4.3 in 2.6 in 26.8 oz 1400 Y Nov 2013 2,749 i i
Panasonic GH4« » 5.2 in 3.7 in 3.3 in 19.8 oz 500 Y Feb 2014 1,499- i
Sony A6300« » 4.7 in 2.6 in 1.9 in 14.3 oz 400 Y Feb 2016 999- i
Sony A6500« » 4.7 in 2.6 in 2.1 in 16.0 oz 350 Y Oct 2016 1,399 i i
Sony A7S II« » 5.0 in 3.8 in 2.4 in 22.1 oz 370 Y Sep 2015 2,999 i i
Sony A7 II« » 5.0 in 3.8 in 2.4 in 21.1 oz 350 Y Nov 2014 1,999- i
Sony A5100« » 4.3 in 2.5 in 1.4 in 10.0 oz 400 n Aug 2014 549 i i
Sony A7R« » 5.0 in 3.7 in 1.9 in 16.4 oz 340 Y Oct 2013 2,299- i
Sony RX1R« » 4.4 in 2.6 in 2.8 in 17.0 oz 270 n Jun 2013 2,799- i
Sony RX1« » 4.4 in 2.6 in 2.8 in 17.0 oz 270 n Sep 2012 2,799- i

The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The A7 was launched at a markedly lower price (by 32 percent) than the A7S, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

 

Sensor comparison: Sony A7 vs Sony A7S

The size of the sensor inside a digital camera is one of the key determinants 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Both cameras under consideration feature a full frame sensor and have a format factor (sometimes also referred to as "crop factor") of 1.0. Within the spectrum of camera sensors, this places the review cameras among the large-sensor cameras that aim for top notch image quality. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Sony A7 and Sony A7S sensor measures

While the two cameras under review share the same sensor size, the A7 offers a higher resolution of 24 megapixel, compared with 12 MP of the A7S. This megapixel advantage translates into a 42 percent gain in linear resolution. On the other hand, these sensor specs imply that the A7 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 5.97μm versus 8.45μm for the A7S). Moreover, it should be noted that the A7S is a somewhat more recent model (by 5 months) than the A7, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of individual pixels.

A7 versus A7S MP

Consistent information on actual sensor performance is available from DXO Mark for most 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. The Overall DXO ratings for the two cameras under consideration are close, suggesting that they provide similar image quality. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

Sensor Characteristics
  Camera Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Sony A7» Full Frame 24.0 6000 40001080/60p24.814.2224890
Sony A7S« Full Frame 12.0 4240 28321080/60p23.913.2370287
Nikon D750« » Full Frame 24.2 6016 40161080/60p24.814.5295693
Nikon D610« » Full Frame 24.2 6016 40161080/30p25.114.4292594
Nikon Df« » Full Frame 16.2 4928 3280-24.613.1327989
Panasonic GH4« » Four Thirds 15.9 4608 34564K/30p23.212.879174
Sony A6300« » APS-C 24.0 6000 40004K/30p24.413.7143785
Sony A6500« » APS-C 24.0 6000 40004K/30p24.513.7140585
Sony A7S II« » Full Frame 12.0 4240 28324K/30p23.613.3299385
Sony A7 II« » Full Frame 24.0 6000 40001080/60p24.913.6244990
Sony A5100« » APS-C 24.0 6000 40001080/60p23.812.7134780
Sony A7R« » Full Frame 36.2 7360 49121080/60p25.614.1274695
Sony RX1R« » Full Frame 24.0 6000 40001080/60p25.013.6253791
Sony RX1« » Full Frame 24.0 6000 40001080/60p25.114.3253493

Many modern cameras cannot only take still pictures, but also record videos. 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 A7 vs Sony A7S

Apart from body and sensor, cameras can and do differ across a range of features. The A7 and the A7S are similar in the sense that both feature an electronic viewfinder, which is helpful when framing images in bright sunlight. Moreover, their viewfinders offer an identical resolution of 2400k dots. The following table reports on some other key feature differences and similarities of the Sony A7, the Sony A7S, and comparable cameras. The full specs-sheets can be found in the camera manual or, for example, in the dpreview camera hub.

Core Features
  Camera Viewfinder
(Type or
'000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec))
Build-in
Flash
(yes/no)
Build-in
Image
Stab
Sony A7»2400 n 3.0 1230 tilting n 8000 5.0 n n
Sony A7S«2400 n 3.0 921 tilting n 8000 5.0 n n
Nikon D750« »optical Y 3.2 1229 tilting n 4000 6.0 Y n
Nikon D610« »optical Y 3.2 921 fixed n 4000 6.0 Y n
Nikon Df« »optical Y 3.2 921 fixed n 4000 5.5 n n
Panasonic GH4« »2359 n 3.0 1036 swivel Y 8000 12.0 Y n
Sony A6300« »2300 n 3.0 922 tilting n 4000 11.0 Y n
Sony A6500« »2300 n 3.0 922 tilting Y 4000 11.0 Y Y
Sony A7S II« »2400 n 3.0 1229 tilting n 8000 5.0 n Y
Sony A7 II« »2400 n 3.0 1230 tilting n 8000 5.0 n Y
Sony A5100« »- n 3.0 922 tilting Y 4000 6.0 Y n
Sony A7R« »2400 n 3.0 1230 tilting n 8000 4.0 n n
Sony RX1R« »- n 3.0 1229 fixed n 4000 5.0 Y n
Sony RX1« »- n 3.0 1229 fixed n 4000 5.0 Y n

Both the A7 and the A7S have been discontinued, but can regularly be found used on eBay. The A7 was replaced by the Sony A7 II, while the A7S was followed by the Sony A7S II.

Review summary: Sony A7 vs Sony A7S

So what is the bottom line? Is there a clear favorite between the Sony A7 and the Sony A7S? The listing below highlights the relative strengths of the two models.


Arguments in favor of the Sony Alpha A7:

  • More detail: Offers more megapixels (24 vs 12MP) with a 41% higher linear resolution.
  • More dynamic range: Captures a larger spectrum of light and dark details (1 EV of extra DR).
  • More detailed LCD: Has a higher resolution rear screen (1230k vs 921k dots).
  • More affordable: Was introduced into a lower priced category (32 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in October 2013).


Reasons to prefer the Sony Alpha A7S:

  • Better low-light sensitivity: Can shoot in dim conditions (0.7 stops ISO advantage).
  • Longer lasting: Gets more shots (380 versus 340) out of a single battery charge.
  • More modern: Was introduced somewhat (5 months) more recently.

If the count of individual advantages (bullet points above) is taken as a guide, the A7 emerges as the winner of the contest (5 : 3 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.

A7 05:03 A7S

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains incomplete and does no justice, for example, to the way the A7 or the A7S handle or perform in practice. 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 where reviews by experts come in. The table below summarizes the assessments of some of the best known camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The detailed reviews can be accessed by clicking on the site logo in the table header.

Review scores
  Camera cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Sony A7»HiRec80/1005/54.5/55/5 Oct 2013 1,699- i
Sony A7S«-86/1004.5/54.5/55/5 Apr 2014 2,499- i
Nikon D750« »HiRec90/1004.5/55/54.5/5 Sep 2014 2,299 i i
Nikon D610« »HiRec87/1004.5/54.5/54.5/5 Oct 2013 1,999 i i
Nikon Df« »-81/1004/54/54/5 Nov 2013 2,749 i i
Panasonic GH4« »HiRec85/1005/55/55/5 Feb 2014 1,499- i
Sony A6300« »Rec85/1005/55/55/5 Feb 2016 999- i
Sony A6500« »HiRec85/1004.5/55/54.5/5 Oct 2016 1,399 i i
Sony A7S II« »Rec-4.5/55/55/5 Sep 2015 2,999 i i
Sony A7 II« »Rec82/1004.5/55/55/5 Nov 2014 1,999- i
Sony A5100« »Rec-4.5/54.5/55/5 Aug 2014 549 i i
Sony A7R« »HiRec82/1004.5/55/55/5 Oct 2013 2,299- i
Sony RX1R« »--4/5rev4.5/5 Jun 2013 2,799- i
Sony RX1« »-79/1004/54.5/54.5/5 Sep 2012 2,799- i

The review scores listed above should be treated with care, 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, please note that some of the review sites have changed their methodology and reporting over time.

 

Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make a corresponding selection in the search boxes below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored. If you do not see the camera that you are looking for, please contact me, and I will try to update the database with the necessary infos.

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