Sony A7S versus Canon T7i
The Sony Alpha A7S and the Canon EOS Rebel T7i (labelled Canon 800D in some countries) are two digital cameras that were announced, respectively, in April 2014 and February 2017. The A7S is a mirrorless interchangeable lens camera, while the T7i is a DSLR. The cameras are based on a full frame (A7S) and an APS-C (T7i) sensor. The Sony has a resolution of 12 megapixel, whereas the Canon provides 24 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 A7S vs Canon T7i
The physical size and weight of the Sony A7S and the Canon T7i are illustrated 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 measures are rounded to the nearest millimeter. You can also use the toggle button 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 side – the A7S – represents the basis for the calculations 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 Canon T7i is notably larger (10 percent) than the Sony A7S. Moreover, the T7i is markedly heavier (9 percent) than the A7S. It is worth mentioning in this context that the A7S is splash and dust resistant, while the T7i does not feature any corresponding weather-sealing.
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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can find an overview of optics for the two cameras in the Sony FE Lens Catalog (A7S) and the Canon EF Lens Catalog (T7i). Mirrorless cameras, such as the Sony A7S, have moreover the advantage that they have a relatively short flange to focal plane distance and can thus use many lenses from other systems 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 A7S (⇒ rgt)||127 mm||94 mm||48 mm||489 g||380||YES||2014||2,499||discont.||check|
|Canon T7i (⇒ lft)||131 mm||100 mm||76 mm||532 g||600||no||2017||749||latest||check|
|Canon T7 (⇒ lft | rgt)||129 mm||101 mm||78 mm||475 g||500||no||2018||449||latest||check|
|Canon 77D (⇒ lft | rgt)||131 mm||100 mm||76 mm||540 g||600||no||2017||899||latest||check|
|Canon M6 (⇒ lft | rgt)||112 mm||68 mm||45 mm||390 g||295||no||2017||779||latest||check|
|Canon SL2 (⇒ lft | rgt)||122 mm||93 mm||70 mm||453 g||650||no||2017||549||latest||check|
|Canon T5i (⇒ lft | rgt)||133 mm||100 mm||79 mm||580 g||440||no||2013||649||discont.||check|
|Nikon D750 (⇒ lft | rgt)||141 mm||113 mm||78 mm||750 g||1230||YES||2014||2,299||latest||check|
|Nikon Df (⇒ lft | rgt)||144 mm||110 mm||67 mm||760 g||1400||YES||2013||2,749||latest||check|
|Nikon D700 (⇒ lft | rgt)||147 mm||123 mm||77 mm||1074 g||1000||YES||2008||2,999||discont.||check|
|Sony A6300 (⇒ lft | rgt)||120 mm||67 mm||49 mm||404 g||400||YES||2016||999||discont.||check|
|Sony A7R II (⇒ lft | rgt)||127 mm||96 mm||60 mm||625 g||290||YES||2015||3,199||discont.||check|
|Sony A7S II (⇒ lft | rgt)||127 mm||96 mm||60 mm||627 g||370||YES||2015||2,999||latest||check|
|Sony A7 II (⇒ lft | rgt)||127 mm||96 mm||60 mm||599 g||350||YES||2014||1,999||discont.||check|
|Sony A7 (⇒ lft | rgt)||127 mm||94 mm||48 mm||474 g||340||YES||2013||1,699||discont.||check|
|Sony A7R (⇒ lft | rgt)||127 mm||94 mm||48 mm||465 g||340||YES||2013||2,299||discont.||check|
|Sony RX1R (⇒ lft | rgt)||113 mm||65 mm||70 mm||482 g||270||no||2013||2,799||discont.||check|
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 T7i was launched at a markedly lower price (by 70 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 A7S vs Canon T7i
The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color depth than smaller pixel-units in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to 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 Canon T7i an APS-C sensor. The sensor area in the T7i is 61 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 1.6. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
Despite having a smaller sensor, the T7i offers a higher resolution of 24 megapixel, compared with 12 MP of the A7S. This megapixel advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.72μm versus 8.45μm for the A7S). However, it should be noted that the T7i is much more recent (by 2 years and 10 months) than the A7S, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Sony A7S (⇒ rgt)||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87|
|Canon T7i (⇒ lft)||APS-C||24.0||6000||4000||1080/60p||..||..||..||..|
|Canon T7 (⇒ lft | rgt)||APS-C||24.0||6000||4000||1080/30p||..||..||..||..|
|Canon 77D (⇒ lft | rgt)||APS-C||24.0||6000||4000||1080/60p||..||..||..||..|
|Canon M6 (⇒ lft | rgt)||APS-C||24.0||6000||4000||1080/60p||..||..||..||..|
|Canon SL2 (⇒ lft | rgt)||APS-C||24.0||6000||4000||1080/60p||23.6||13.4||1041||79|
|Canon T5i (⇒ lft | rgt)||APS-C||17.9||5184||3456||1080/30p||21.7||11.2||681||61|
|Nikon D750 (⇒ lft | rgt)||Full Frame||24.2||6016||4016||1080/60p||24.8||14.5||2956||93|
|Nikon Df (⇒ lft | rgt)||Full Frame||16.2||4928||3280||no||24.6||13.1||3279||89|
|Nikon D700 (⇒ lft | rgt)||Full Frame||12.1||4256||2832||no||23.5||12.2||2303||80|
|Sony A6300 (⇒ lft | rgt)||APS-C||24.0||6000||4000||4K/30p||24.4||13.7||1437||85|
|Sony A7R II (⇒ lft | rgt)||Full Frame||42.2||7952||5304||4K/30p||26.0||13.9||3434||98|
|Sony A7S II (⇒ lft | rgt)||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|Sony A7 II (⇒ lft | rgt)||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|Sony A7 (⇒ lft | rgt)||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90|
|Sony A7R (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
|Sony RX1R (⇒ lft | rgt)||Full Frame||24.0||6000||4000||1080/60p||25.0||13.6||2537||91|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, and both provide the same movie specifications (1080/60p).
Feature comparison: Sony A7S vs Canon T7i
Beyond body and sensor, cameras can and do differ across a range of features. For example, the A7S has an electronic viewfinder (2400k dots), while the T7i 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 table below summarizes some of the other core capabilities of the Sony A7S and Canon T7i in connection with corresponding information for a sample of similar cameras. If needed, the dpreview camera hub, for example, contains further detail on the cameras' specs.
|Sony A7S (⇒ rgt)||2400||no||3.0||921||tilting||no||8000||5.0||no||no|
|Canon T7i (⇒ lft)||optical||no||3.0||1040||swivel||YES||4000||6.0||12||no|
|Canon T7 (⇒ lft | rgt)||optical||no||3.0||920||fixed||no||4000||3.0||9.2||no|
|Canon 77D (⇒ lft | rgt)||optical||YES||3.0||1040||swivel||YES||4000||6.0||12||no|
|Canon M6 (⇒ lft | rgt)||no||no||3.0||1040||tilting||YES||4000||9.0||5||no|
|Canon SL2 (⇒ lft | rgt)||optical||no||3.0||1040||swivel||YES||4000||5.0||9.8||no|
|Canon T5i (⇒ lft | rgt)||optical||no||3.0||1040||swivel||YES||4000||5.0||13||no|
|Nikon D750 (⇒ lft | rgt)||optical||YES||3.2||1229||tilting||no||4000||6.0||12||no|
|Nikon Df (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||4000||5.5||no||no|
|Nikon D700 (⇒ lft | rgt)||optical||YES||3.0||922||fixed||no||8000||8.0||12||no|
|Sony A6300 (⇒ lft | rgt)||2300||no||3.0||922||tilting||no||4000||11.0||6||no|
|Sony A7R II (⇒ lft | rgt)||2400||no||3.0||1229||tilting||no||8000||5.0||no||YES|
|Sony A7S II (⇒ lft | rgt)||2400||no||3.0||1229||tilting||no||8000||5.0||no||YES|
|Sony A7 II (⇒ lft | rgt)||2400||no||3.0||1230||tilting||no||8000||5.0||no||YES|
|Sony A7 (⇒ lft | rgt)||2400||no||3.0||1230||tilting||no||8000||5.0||no||no|
|Sony A7R (⇒ lft | rgt)||2400||no||3.0||1230||tilting||no||8000||4.0||no||no|
|Sony RX1R (⇒ lft | rgt)||no||no||3.0||1229||fixed||no||4000||5.0||6||no|
The T7i is a current model that online retailers, such as amazon, will have in stock. In contrast, the A7S has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the A7S was succeeded by the Sony A7S II.
Review summary: Sony A7S vs Canon T7i
So what conclusions can be drawn? Is the Sony A7S better than the Canon T7i or vice versa? The listing below highlights the relative strengths of the two models.
Reasons to prefer the Sony Alpha A7S:
- Better low-light imaging: Features bigger pixels on a larger sensor for better high-ISO images.
- More framing info: Has an electronic viewfinder that displays shooting data.
- Faster shutter: Has higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
- Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
- More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
- More heavily discounted: Has been available for much longer (launched in April 2014).
Advantages of the Canon EOS Rebel T7i:
- More detail: Has more megapixels (24 vs 12MP), which boosts linear resolution by 41%.
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- More detailed LCD: Has a higher resolution rear screen (1040k vs 921k dots).
- More flexible LCD: Has swivel screen for odd-angle shots in portrait or landscape orientation.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Faster burst: Shoots at higher frequency (6 vs 5 flaps/sec) to capture the decisive moment.
- Longer lasting: Gets more shots (600 versus 380) out of a single battery charge.
- Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
- More affordable: Was introduced into a lower priced category (70 percent cheaper at launch).
- More modern: Reflects 2 years and 10 months of technical progress since the A7S launch.
If the count of individual advantages (bullet points above) is taken as a guide, the T7i is the clear winner of the contest (10 : 6 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.
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 handling experience and imaging performance when actually working with the A7S or the T7i. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate. This is why hands-on reviews by experts are important. The table below summarizes the assessments of some of the best known camera review sites. The detailed reviews can be accessed, respectively, on the websites of cameralabs.com, dpreview.com, ephotozine.com, imaging-resource.com, and photographyblog.com.
|Sony A7S (⇒ rgt)||-||86/100 Gold||4.5/5||4.5/5||5/5||2014||2,499||discont.||check|
|Canon T7i (⇒ lft)||..||80/100 Gold||4.5/5||4/5||4/5||2017||749||latest||check|
|Canon T7 (⇒ lft | rgt)||reviewed||..||3.5/5||..||3.5/5||2018||449||latest||check|
|Canon 77D (⇒ lft | rgt)||..||82/100 Silver||4.5/5||4.5/5||4/5||2017||899||latest||check|
|Canon M6 (⇒ lft | rgt)||-||80/100 Silver||4/5||4.5/5||4/5||2017||779||latest||check|
|Canon SL2 (⇒ lft | rgt)||HiRec||78/100 Silver||4.5/5||4.5/5||4.5/5||2017||549||latest||check|
|Canon T5i (⇒ lft | rgt)||-||76/100 Silver||4.5/5||4.5/5||4.5/5||2013||649||discont.||check|
|Nikon D750 (⇒ lft | rgt)||HiRec||90/100 Gold||4.5/5||5/5||4.5/5||2014||2,299||latest||check|
|Nikon Df (⇒ lft | rgt)||-||81/100||4/5||4/5||4/5||2013||2,749||latest||check|
|Nikon D700 (⇒ lft | rgt)||89/100||HiRec||4.5/5||5/5||4.5/5||2008||2,999||discont.||check|
|Sony A6300 (⇒ lft | rgt)||Rec||85/100 Gold||5/5||5/5||5/5||2016||999||discont.||check|
|Sony A7R II (⇒ lft | rgt)||HiRec||90/100 Gold||5/5||4.5/5||5/5||2015||3,199||discont.||check|
|Sony A7S II (⇒ lft | rgt)||Rec||-||4.5/5||5/5||5/5||2015||2,999||latest||check|
|Sony A7 II (⇒ lft | rgt)||Rec||82/100 Silver||4.5/5||5/5||5/5||2014||1,999||discont.||check|
|Sony A7 (⇒ lft | rgt)||HiRec||80/100 Silver||5/5||4.5/5||5/5||2013||1,699||discont.||check|
|Sony A7R (⇒ lft | rgt)||HiRec||82/100 Gold||4.5/5||5/5||5/5||2013||2,299||discont.||check|
|Sony RX1R (⇒ lft | rgt)||-||-||4/5||reviewed||4.5/5||2013||2,799||discont.||check|
Care should be taken when interpreting the review scores above, though. The ratings are only valid when refering to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. It should also be noted that some of the review sites have over time altered the way they render their verdicts.
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. An an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool. If you do not see the camera that you are looking for, please send me an email, and I will try to locate and add the respective data to the application.
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