Canon SL1 vs Sony A7S
The Canon EOS Rebel SL1 (called Canon 100D in some regions) and the Sony Alpha A7S are two digital cameras that were officially introduced, respectively, in March 2013 and April 2014. The SL1 is a DSLR, while the A7S is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (SL1) and a full frame (A7S) sensor. The Canon has a resolution of 17.9 megapixels, whereas the Sony provides 12 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 Canon EOS Rebel SL1 and the Sony Alpha A7S? 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 Canon SL1 and the Sony A7S is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.
The SL1 can be obtained in two different colors (black, white), while the A7S is only available in black.
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7S is notably larger (12 percent) than the Canon SL1. Moreover, the A7S is markedly heavier (20 percent) than the SL1. It is noteworthy in this context that the A7S is splash and dust-proof, while the SL1 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 compare the optics available for the two cameras in the Canon EF Lens Catalog (SL1) and the Sony FE Lens Catalog (A7S). Mirrorless cameras, such as the A7S, have moreover the advantage that they can use many lenses from other systems via adapters, as they have a relatively short flange to focal plane distance.
The power pack in the A7S can be charged via the USB port, which can be very convenient when travelling.
The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.
|1.||Canon SL1||117 mm||91 mm||69 mm||407 g||380||n||Mar 2013||549|
|2.||Sony A7S||127 mm||94 mm||48 mm||489 g||380||Y||Apr 2014||2,499|
|3.||Canon T100||129 mm||102 mm||77 mm||436 g||500||n||Feb 2018||399|
|4.||Canon SL2||122 mm||93 mm||70 mm||453 g||650||n||Jun 2017||549|
|5.||Canon T6||129 mm||101 mm||78 mm||485 g||500||n||Mar 2016||449|
|6.||Canon M10||108 mm||67 mm||35 mm||301 g||255||n||Oct 2015||499|
|7.||Canon T5||130 mm||100 mm||78 mm||480 g||500||n||Feb 2014||449|
|8.||Canon G16||109 mm||76 mm||40 mm||356 g||360||n||Aug 2013||549|
|9.||Canon T5i||133 mm||100 mm||79 mm||580 g||440||n||Mar 2013||649|
|10.||Canon M||109 mm||66 mm||32 mm||298 g||230||n||Jul 2012||599|
|11.||Canon T4i||133 mm||100 mm||79 mm||575 g||440||n||Jun 2012||849|
|12.||Canon T3i||133 mm||100 mm||80 mm||570 g||440||n||Feb 2011||599|
|13.||Nikon Df||144 mm||110 mm||67 mm||760 g||1400||Y||Nov 2013||2,749|
|14.||Sony A7S II||127 mm||96 mm||60 mm||627 g||370||Y||Sep 2015||2,999|
|15.||Sony A7 II||127 mm||96 mm||60 mm||599 g||350||Y||Nov 2014||1,999|
|16.||Sony A7||127 mm||94 mm||48 mm||474 g||340||Y||Oct 2013||1,699|
|17.||Sony A7R||127 mm||94 mm||48 mm||465 g||340||Y||Oct 2013||2,299|
|Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
Any camera decision will naturally be influenced heavily by the price. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The SL1 was launched at a markedly lower price (by 78 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.
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 more expensive and lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Canon SL1 features an APS-C sensor and the Sony A7S a full frame sensor. The sensor area in the A7S is 158 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
In terms of underlying technology, both cameras are build around CMOS sensors.
Despite having a smaller sensor, the Canon SL1 offers a higher resolution of 17.9 megapixels, compared with 12 MP of the Sony 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 4.31μm versus 8.45μm for the A7S). Moreover, it should be noted that the A7S is a somewhat more recent model (by 1 year) than the SL1, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units.
The resolution advantage of the Canon SL1 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the SL1 for good quality output (200 dots per inch) amounts to 25.9 x 17.3 inches or 65.8 x 43.9 cm, for very good quality (250 dpi) 20.7 x 13.8 inches or 52.7 x 35.1 cm, and for excellent quality (300 dpi) 17.3 x 11.5 inches or 43.9 x 29.3 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 SL1 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
The Canon EOS Rebel SL1 has a native sensitivity range from ISO 100 to ISO 12800, which can be extended to ISO 100-25600. The corresponding ISO settings for the Sony Alpha A7S are ISO 100 to ISO 102400, with the possibility to increase the ISO range to 50-409600.
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 consideration, the A7S offers substantially better image quality than the SL1 (overall score 24 points higher). The advantage is based on 2.1 bits higher color depth, 1.9 EV in additional dynamic range, and 2.1 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.
|2.||Sony A7S||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87|
|13.||Nikon Df||Full Frame||16.2||4928||3280||none||24.6||13.1||3279||89|
|14.||Sony A7S II||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|15.||Sony A7 II||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|16.||Sony A7||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90|
|17.||Sony A7R||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
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, but the A7S provides a faster frame rate than the SL1. It can shoot movie footage at 1080/60p, while the Canon is limited to 1080/30p.
Apart from 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 SL1 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 viewfinder in the A7S offers a wider field of view (100%) than the one in the SL1 (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the A7S has a higher magnification (0.71x vs 0.54x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Canon SL1 and Sony A7S along with similar information for a selection of comparators.
|1.||Canon SL1||optical||n||3.0 / 1040||fixed||Y||1/4000s||4.9||Y||n|
|2.||Sony A7S||2400||n||3.0 / 921||tilting||n||1/8000s||5.0||n||n|
|3.||Canon T100||optical||n||2.7 / 230||fixed||n||1/4000s||3.0||Y||n|
|4.||Canon SL2||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0||Y||n|
|5.||Canon T6||optical||n||3.0 / 920||fixed||n||1/4000s||3.0||Y||n|
|6.||Canon M10||none||n||3.0 / 1040||tilting||Y||1/4000s||4.6||Y||n|
|7.||Canon T5||optical||n||3.0 / 460||fixed||n||1/4000s||3.0||Y||n|
|8.||Canon G16||optical||n||3.0 / 922||fixed||n||1/4000s||2.2||Y||Y|
|9.||Canon T5i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0||Y||n|
|10.||Canon M||none||n||3.0 / 1040||fixed||Y||1/4000s||4.3||n||n|
|11.||Canon T4i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0||Y||n|
|12.||Canon T3i||optical||n||3.0 / 1040||swivel||n||1/4000s||3.7||Y||n|
|13.||Nikon Df||optical||Y||3.2 / 921||fixed||n||1/4000s||5.5||n||n|
|14.||Sony A7S II||2400||n||3.0 / 1229||tilting||n||1/8000s||5.0||n||Y|
|15.||Sony A7 II||2400||n||3.0 / 1230||tilting||n||1/8000s||5.0||n||Y|
|16.||Sony A7||2400||n||3.0 / 1230||tilting||n||1/8000s||5.0||n||n|
|17.||Sony A7R||2400||n||3.0 / 1230||tilting||n||1/8000s||4.0||n||n|
One difference between the cameras concerns the presence of an on-board flash. The SL1 has one, while the A7S does not. While the built-in flash of the SL1 is not very powerful, it can at times be useful as a fill-in light.
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).
The SL1 writes its imaging data to SDXC cards, while the A7S uses 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 Canon EOS Rebel SL1 and Sony Alpha A7S and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Canon SL1||Y||mono / mono||Y||-||mini||2.0||-||-||-|
|2.||Sony A7S||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|3.||Canon T100||Y||mono / mono||-||-||mini||2.0||Y||Y||-|
|4.||Canon SL2||Y||stereo / mono||Y||-||mini||2.0||Y||Y||Y|
|5.||Canon T6||Y||mono / mono||-||-||mini||2.0||Y||Y||-|
|6.||Canon M10||-||stereo / mono||-||-||mini||2.0||Y||Y||-|
|7.||Canon T5||Y||mono / mono||-||-||mini||2.0||-||-||-|
|8.||Canon G16||Y||stereo / mono||-||-||mini||2.0||Y||-||-|
|9.||Canon T5i||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|10.||Canon M||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|11.||Canon T4i||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|12.||Canon T3i||Y||mono / mono||Y||-||mini||2.0||-||-||-|
|13.||Nikon Df||Y||- / -||-||-||mini||2.0||-||-||-|
|14.||Sony A7S II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|15.||Sony A7 II||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|16.||Sony A7||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|17.||Sony A7R||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
It is notable that the A7S offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the SL1 does not provide wifi capability.
Both the SL1 and the A7S have been discontinued, but can regularly be found used on eBay. The SL1 was replaced by the Canon SL2, while the A7S was followed by the Sony A7S II. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and Sony websites.
So what is the bottom line? Is the Canon SL1 better than the Sony A7S or vice versa? Below is a summary of the relative strengths of each of the two contestants.
Arguments in favor of the Canon EOS Rebel SL1:
- More detail: Offers more megapixels (17.9 vs 12MP) with a 22% higher linear resolution.
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- More detailed LCD: Has a higher resolution rear screen (1040k vs 921k dots).
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- More compact: Is smaller (117x91mm vs 127x94mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 82g or 17 percent) and hence easier to carry around.
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- More affordable: Was introduced into a lower priced category (78 percent cheaper at launch).
- More heavily discounted: Has been on the market for longer (launched in March 2013).
Advantages of the Sony Alpha A7S:
- Better image quality: Scores substantially higher (24 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (2.1 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (1.9 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (2.1 stops ISO advantage).
- Better video: Provides higher movie framerates (1080/60p versus 1080/30p).
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- More framing info: Has an electronic viewfinder that displays shooting data.
- More complete view: Has a viewfinder with a larger field of view (100% vs 95%).
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.71x vs 0.54x).
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- Easier travel charging: Can be conveniently charged via its USB port.
- Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
- More legacy lens friendly: Can use many non-native lenses via adapters.
- Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
- Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
- More modern: Was introduced somewhat (1 year) more recently.
If the number of relative strengths (bullet points above) is taken as a guide, the A7S is the clear winner of the contest (18 : 10 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. 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 Canon SL1 and the Sony A7S place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings whether the two cameras rank among the cream of the crop.
In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the SL1 or the A7S perform in practice. 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 expert reviews are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], 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.||Canon SL1||4/5||+||..||78/100||4/5||4/5||Mar 2013||549|
|2.||Sony A7S||4/5||..||..||86/100||4.5/5||5/5||Apr 2014||2,499|
|3.||Canon T100||..||o||3/5||..||3.5/5||3.5/5||Feb 2018||399|
|4.||Canon SL2||4/5||+ +||4/5||78/100||4.5/5||4.5/5||Jun 2017||549|
|5.||Canon T6||4/5||o||4/5||73/100||4/5||4/5||Mar 2016||449|
|6.||Canon M10||..||..||..||..||..||4/5||Oct 2015||499|
|7.||Canon T5||3/5||+||..||..||4/5||4.5/5||Feb 2014||449|
|8.||Canon G16||4/5||+||..||..||4.5/5||4.5/5||Aug 2013||549|
|9.||Canon T5i||..||..||..||76/100||4.5/5||4.5/5||Mar 2013||649|
|10.||Canon M||3/5||+||..||..||4/5||4/5||Jul 2012||599|
|11.||Canon T4i||4/5||+ +||..||77/100||4.5/5||4.5/5||Jun 2012||849|
|12.||Canon T3i||3/5||o||..||77/100||4.5/5||4.5/5||Feb 2011||599|
|13.||Nikon Df||4/5||..||..||81/100||4/5||4/5||Nov 2013||2,749|
|14.||Sony A7S II||5/5||+||..||..||4.5/5||5/5||Sep 2015||2,999|
|15.||Sony A7 II||5/5||+||4/5||82/100||4.5/5||5/5||Nov 2014||1,999|
|16.||Sony A7||5/5||+ +||..||80/100||5/5||5/5||Oct 2013||1,699|
|17.||Sony A7R||5/5||+ +||..||82/100||4.5/5||5/5||Oct 2013||2,299|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The review scores listed above should be treated with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. 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? 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: Canon SL1 vs Sony A7S
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||Canon SL1||Sony A7S|
|Camera Type||Digital single lens reflex||Mirrorless system camera|
|Camera Lens||Canon EF mount lenses||Sony E mount lenses|
|Launch Date||March 2013||April 2014|
|Launch Price||USD 549||USD 2,499|
|Sensor Specs||Canon SL1||Sony A7S|
|Sensor Format||APS-C Sensor||Full Frame Sensor|
|Sensor Size||22.3 x 14.9 mm||35.8 x 23.9 mm|
|Sensor Area||332.27 mm2||855.62 mm2|
|Sensor Diagonal||26.8 mm||43 mm|
|Sensor Resolution||17.9 Megapixels||12 Megapixels|
|Image Resolution||5184 x 3456 pixels||4240 x 2832 pixels|
|Pixel Pitch||4.31 μm||8.45 μm|
|Pixel Density||5.39 MP/cm2||1.40 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/30p Video||1080/60p Video|
|ISO Setting||100 - 12,800 ISO||100 - 102,400 ISO|
|ISO Boost||100 - 25,600 ISO||50 - 409,600 ISO|
|Image Processor||DIGIC 5||BIONZ X|
|DXO Sensor Quality (score)||63||87|
|DXO Color Depth (bits)||21.8||23.9|
|DXO Dynamic Range (EV)||11.3||13.2|
|DXO Low Light (ISO)||843||3702|
|Screen Specs||Canon SL1||Sony A7S|
|Viewfinder Type||Optical viewfinder||Electronic viewfinder|
|Viewfinder Field of View||95%||100%|
|Viewfinder Resolution||2400k dots|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||1040k dots||921k dots|
|LCD Attachment||Fixed screen||Tilting screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Canon SL1||Sony A7S|
|Focus System||Phase-detect AF||Contrast-detect AF|
|Manual Focusing Aid||no Peaking Feature||Focus Peaking|
|Max Shutter Speed (mechanical)||1/4000s||1/8000s|
|Continuous Shooting||4.9 shutter flaps/s||5 shutter flaps/s|
|Electronic Shutter||no E-Shutter||YES|
|Fill Flash||Built-in Flash||no On-Board Flash|
|Storage Medium||SDXC cards||MS or SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|UHS card support||UHS-I||UHS-I|
|Connectivity Specs||Canon SL1||Sony A7S|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||micro HDMI|
|Microphone Port||External MIC port||External MIC port|
|Headphone Socket||no Headphone port||Headphone port|
|Wifi Support||no Wifi||Wifi built-in|
|Near-Field Communication||no NFC||NFC built-in|
|Body Specs||Canon SL1||Sony A7S|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||380 shots per charge||380 shots per charge|
|In-Camera Charging||no USB charging||USB charging|
117 x 91 x 69 mm
(4.6 x 3.6 x 2.7 in)
127 x 94 x 48 mm
(5.0 x 3.7 x 1.9 in)
|Camera Weight||407 g (14.4 oz)||489 g (17.2 oz)|
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