Sony A7 versus Sony A7S II
The Sony Alpha A7 and the Sony Alpha 7S II are two digital cameras that were revealed to the public, respectively, in October 2013 and September 2015. Both the A7 and the A7S II are mirrorless interchangeable lens cameras that are equipped with a full frame sensor. The A7 has a resolution of 24 megapixel, whereas the A7S II 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 II
The side-by-side display below illustrates the physical size and weight of the Sony A7 and the Sony A7S II. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter. You can also toggle the display to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left – the A7 – represents the basis or 100 percent across all the size and weight measures).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7S II is somewhat larger (2 percent) than the Sony A7. Moreover, the A7S II is markedly heavier (32 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|
|Sony A7»||5.0 in||3.7 in||1.9 in||16.7 oz||340||Y||Oct 2013||1,699||-|
|Sony A7S II«||5.0 in||3.8 in||2.4 in||22.1 oz||370||Y||Sep 2015||2,999|
|Nikon D610« »||5.6 in||4.4 in||3.2 in||30.0 oz||900||Y||Oct 2013||1,999|
|Panasonic GH4« »||5.2 in||3.7 in||3.3 in||19.8 oz||500||Y||Feb 2014||1,499||-|
|Sony A7 III« »||5.0 in||3.8 in||2.9 in||22.9 oz||610||Y||Feb 2018||1,999|
|Sony A99 II« »||5.6 in||4.1 in||3.0 in||29.9 oz||490||Y||Sep 2016||3,199|
|Sony A6300« »||4.7 in||2.6 in||1.9 in||14.3 oz||400||Y||Feb 2016||999||-|
|Sony A6500« »||4.7 in||2.6 in||2.1 in||16.0 oz||350||Y||Oct 2016||1,399|
|Sony A7R II« »||5.0 in||3.8 in||2.4 in||22.0 oz||290||Y||Jun 2015||3,199||-|
|Sony A7 II« »||5.0 in||3.8 in||2.4 in||21.1 oz||350||Y||Nov 2014||1,999||-|
|Sony A7S« »||5.0 in||3.7 in||1.9 in||17.2 oz||380||Y||Apr 2014||2,499||-|
|Sony A5100« »||4.3 in||2.5 in||1.4 in||10.0 oz||400||n||Aug 2014||549|
|Sony A7R« »||5.0 in||3.7 in||1.9 in||16.4 oz||340||Y||Oct 2013||2,299||-|
|Sony RX1R« »||4.4 in||2.6 in||2.8 in||17.0 oz||270||n||Jun 2013||2,799||-|
|Sony RX1« »||4.4 in||2.6 in||2.8 in||17.0 oz||270||n||Sep 2012||2,799||-|
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 43 percent) than the A7S II, 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 II
The imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Both cameras under consideration feature a full frame sensor, but their sensors differ slightly in size. The sensor area in the A7S II 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.
With 24MP, the A7 offers a higher resolution than the A7S II (12MP), but the A7 has smaller individual pixels (pixel pitch of 5.97μm versus 8.40μm for the A7S II). Moreover, the A7S II is a somewhat more recent model (by 1 year and 10 months) than the A7, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels.
Consistent information on actual sensor performance is available from DXO Mark for most cameras. 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 A7 has a notably higher overall DXO score than the A7S II (overall score 5 points higher), which gives it an advantage in terms of imaging quality. This advantage is based on 1.2 bits higher color depth, 0.9 EV in additional dynamic range, 0.4 stops of reduced 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 A7»||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90|
|Sony A7S II«||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|Nikon D610« »||Full Frame||24.2||6016||4016||1080/30p||25.1||14.4||2925||94|
|Panasonic GH4« »||Four Thirds||15.9||4608||3456||4K/30p||23.2||12.8||791||74|
|Sony A7 III« »||Full Frame||24.0||6000||4000||4K/30p||25.0||14.7||3730||96|
|Sony A99 II« »||Full Frame||42.2||7952||5304||4K/30p||25.4||13.4||2317||92|
|Sony A6300« »||APS-C||24.0||6000||4000||4K/30p||24.4||13.7||1437||85|
|Sony A6500« »||APS-C||24.0||6000||4000||4K/30p||24.5||13.7||1405||85|
|Sony A7R II« »||Full Frame||42.2||7952||5304||4K/30p||26.0||13.9||3434||98|
|Sony A7 II« »||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|Sony A7S« »||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87|
|Sony A5100« »||APS-C||24.0||6000||4000||1080/60p||23.8||12.7||1347||80|
|Sony A7R« »||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
|Sony RX1R« »||Full Frame||24.0||6000||4000||1080/60p||25.0||13.6||2537||91|
|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 also of capturing video footage. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the A7S II provides a better video resolution than the A7. It can shoot movie footage at 4K/30p, while the A7 is limited to 1080/60p.
Feature comparison: Sony A7 vs Sony A7S II
Apart from body and sensor, cameras can and do differ across a variety of features. The A7 and the A7S II 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 adjacent table lists some of the other core features of the Sony A7 and Sony A7S II along with similar information for a selection of comparators. If needed, the dpreview camera hub, for example, contains further detail on the cameras' specs.
|Sony A7S II«||2400||n||3.0||1229||tilting||n||8000||5.0||n||Y|
|Nikon D610« »||optical||Y||3.2||921||fixed||n||4000||6.0||Y||n|
|Panasonic GH4« »||2359||n||3.0||1036||swivel||Y||8000||12.0||Y||n|
|Sony A7 III« »||2359||n||3.0||922||tilting||Y||8000||10.0||n||Y|
|Sony A99 II« »||2400||Y||3.0||1229||full-flex||n||8000||12.0||n||Y|
|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 A7R 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 A7S« »||2400||n||3.0||921||tilting||n||8000||5.0||n||n|
|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|
The A7S II is a current model that online retailers, such as amazon, will have in stock. In contrast, the A7 has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the A7 was succeeded by the Sony A7 II.
Review summary: Sony A7 vs Sony A7S II
So what is the bottom line? Is the Sony A7 better than the Sony A7S II or vice versa? The listing below highlights the relative strengths of the two models.
Advantages of the Sony Alpha A7:
- More detail: Offers more megapixels (24 vs 12MP) with a 41% higher linear resolution.
- Better image quality: Scores markedly higher (5 points) in the DXO overall assessment.
- Richer colors: Generates images with noticeably better colors (1.2 bits more color depth).
- More dynamic range: Captures a larger spectrum of light and dark details (0.9 EV of extra DR).
- Less heavy: Is lighter (by 153g or 24 percent) and hence easier to carry around.
- More affordable: Was introduced into a lower priced category (43 percent cheaper at launch).
- More heavily discounted: Has been on the market for longer (launched in October 2013).
Arguments in favor of the Sony Alpha 7S II:
- Better low-light sensitivity: Can shoot in dim conditions (0.4 stops ISO advantage).
- Better video: Provides higher definition movie capture (4K/30p vs 1080/60p).
- Sharper images: Has stabilization technology build-in to reduce the impact of hand-shake.
- More modern: Was introduced somewhat (1 year and 10 months) more recently.
If the number of relative strengths (bullet points above) is taken as a guide, the A7 emerges as the winner of the contest (7 : 4 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.
In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it says nothing about, for example, the handling, responsiveness, and overall imaging quality of the A7 and the A7S II in practical situations. 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 why expert reviews are important. 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.
|Sony A7»||HiRec||80/100||5/5||4.5/5||5/5||Oct 2013||1,699||-|
|Sony A7S II«||Rec||-||4.5/5||5/5||5/5||Sep 2015||2,999|
|Nikon D610« »||HiRec||87/100||4.5/5||4.5/5||4.5/5||Oct 2013||1,999|
|Panasonic GH4« »||HiRec||85/100||5/5||5/5||5/5||Feb 2014||1,499||-|
|Sony A7 III« »||HiRec||89/100||5/5||-||5/5||Feb 2018||1,999|
|Sony A99 II« »||-||85/100||4.5/5||4.5/5||4.5/5||Sep 2016||3,199|
|Sony A6300« »||Rec||85/100||5/5||5/5||5/5||Feb 2016||999||-|
|Sony A6500« »||HiRec||85/100||4.5/5||5/5||4.5/5||Oct 2016||1,399|
|Sony A7R II« »||HiRec||90/100||5/5||4.5/5||5/5||Jun 2015||3,199||-|
|Sony A7 II« »||Rec||82/100||4.5/5||5/5||5/5||Nov 2014||1,999||-|
|Sony A7S« »||-||86/100||4.5/5||4.5/5||5/5||Apr 2014||2,499||-|
|Sony A5100« »||Rec||-||4.5/5||4.5/5||5/5||Aug 2014||549|
|Sony A7R« »||HiRec||82/100||4.5/5||5/5||5/5||Oct 2013||2,299||-|
|Sony RX1R« »||-||-||4/5||rev||4.5/5||Jun 2013||2,799||-|
|Sony RX1« »||-||79/100||4/5||4.5/5||4.5/5||Sep 2012||2,799||-|
Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Thus, a score needs to be put into the context of the launch date and the launch price 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.
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