Canon XTi vs Sony A7S
The Canon EOS Rebel XTi (called Canon 400D in some regions) and the Sony Alpha A7S are two digital cameras that were announced, respectively, in August 2006 and April 2014. The XTi is a DSLR, while the A7S is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (XTi) and a full frame (A7S) sensor. The Canon has a resolution of 10.1 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 XTi 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.
The physical size and weight of the Canon XTi and the Sony A7S are illustrated 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 size dimensions are rounded to the nearest millimeter.
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 XTi. However, the A7S is markedly lighter (12 percent) than the XTi. It is noteworthy in this context that the A7S is splash and dust-proof, while the XTi 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 (XTi) 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.
Concerning battery life, the XTi gets 370 shots out of its NB-2LH battery, while the A7S can take 380 images on a single charge of its NP-FW50 power pack. 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 would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.
|1.||Canon XTi||127 mm||84 mm||65 mm||556 g||370||n||Aug 2006||799||ebay.com|
|2.||Sony A7S||127 mm||94 mm||48 mm||489 g||380||Y||Apr 2014||2,499||ebay.com|
|3.||Canon T6i||132 mm||101 mm||78 mm||555 g||440||n||Feb 2015||749||ebay.com|
|4.||Canon T6s||132 mm||101 mm||78 mm||565 g||440||n||Feb 2015||649||ebay.com|
|5.||Canon T4i||133 mm||100 mm||79 mm||575 g||440||n||Jun 2012||849||ebay.com|
|6.||Canon T3||130 mm||100 mm||78 mm||495 g||700||n||Feb 2011||449||ebay.com|
|7.||Canon T2i||129 mm||98 mm||62 mm||530 g||440||n||Feb 2010||699||ebay.com|
|8.||Canon T1i||129 mm||98 mm||62 mm||520 g||400||n||Mar 2009||799||ebay.com|
|9.||Canon XSi||129 mm||98 mm||62 mm||524 g||500||n||Jan 2008||799||ebay.com|
|10.||Canon 40D||146 mm||108 mm||74 mm||822 g||750||n||Aug 2007||1,299||ebay.com|
|11.||Canon XT||127 mm||94 mm||64 mm||540 g||400||n||Feb 2005||899||ebay.com|
|12.||Canon Rebel||142 mm||99 mm||72 mm||649 g||400||n||Aug 2003||899||ebay.com|
|13.||Nikon Df||144 mm||110 mm||67 mm||760 g||1400||Y||Nov 2013||2,749||ebay.com|
|14.||Sony A7S II||127 mm||96 mm||60 mm||627 g||370||Y||Sep 2015||2,999||ebay.com|
|15.||Sony A7 II||127 mm||96 mm||60 mm||599 g||350||Y||Nov 2014||1,999||ebay.com|
|16.||Sony A7||127 mm||94 mm||48 mm||474 g||340||Y||Oct 2013||1,699||ebay.com|
|17.||Sony A7R||127 mm||94 mm||48 mm||465 g||340||Y||Oct 2013||2,299||ebay.com|
|Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
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 XTi was launched at a markedly lower price (by 68 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.
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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Canon XTi features an APS-C sensor and the Sony A7S a full frame sensor. The sensor area in the A7S is 160 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.
With 12MP, the A7S offers a higher resolution than the XTi (10.1MP), but the A7S nevertheless has larger individual pixels (pixel pitch of 8.45μm versus 5.71μm for the XTi) due to its larger sensor. Moreover, the A7S is a much more recent model (by 7 years and 7 months) than the XTi, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units.
The resolution advantage of the Sony A7S implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7S for good quality output (200 dots per inch) amounts to 21.2 x 14.2 inches or 53.8 x 36 cm, for very good quality (250 dpi) 17 x 11.3 inches or 43.1 x 28.8 cm, and for excellent quality (300 dpi) 14.1 x 9.4 inches or 35.9 x 24 cm. The corresponding values for the Canon XTi are 19.4 x 13 inches or 49.4 x 32.9 cm for good quality, 15.6 x 10.4 inches or 39.5 x 26.3 cm for very good quality, and 13 x 8.6 inches or 32.9 x 21.9 cm for excellent quality prints.
The Canon EOS Rebel XTi has a native sensitivity range from ISO 100 to ISO 1600. 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.
Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.
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. Of the two cameras under consideration, the A7S offers substantially better image quality than the XTi (overall score 25 points higher). The advantage is based on 1.8 bits higher color depth, 2.2 EV in additional dynamic range, and 2.5 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 cannot only take still pictures, but also record videos. The A7S indeed provides for movie recording, while the XTi does not. The highest resolution format that the A7S can use is 1080/60p.
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 XTi 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 XTi (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 0.49x), 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 XTi and Sony A7S along with similar information for a selection of comparators.
|1.||Canon XTi||optical||n||2.5 / 230||fixed||n||1/4000s||3.0/s||Y||n|
|2.||Sony A7S||2400||n||3.0 / 921||tilting||n||1/8000s||5.0/s||n||n|
|3.||Canon T6i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|4.||Canon T6s||optical||Y||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|5.||Canon T4i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0/s||Y||n|
|6.||Canon T3||optical||n||2.7 / 230||fixed||n||1/4000s||3.0/s||Y||n|
|7.||Canon T2i||optical||n||3.0 / 1040||fixed||n||1/4000s||3.7/s||Y||n|
|8.||Canon T1i||optical||n||3.0 / 920||fixed||n||1/4000s||3.4/s||Y||n|
|9.||Canon XSi||optical||n||3.0 / 230||fixed||n||1/4000s||3.5/s||Y||n|
|10.||Canon 40D||optical||Y||3.0 / 230||fixed||n||1/8000s||6.5/s||Y||n|
|11.||Canon XT||optical||n||1.8 / 115||fixed||n||1/4000s||3.0/s||Y||n|
|12.||Canon Rebel||optical||n||1.8 / 118||fixed||n||1/4000s||2.5/s||Y||n|
|13.||Nikon Df||optical||Y||3.2 / 921||fixed||n||1/4000s||5.5/s||n||n|
|14.||Sony A7S II||2400||n||3.0 / 1229||tilting||n||1/8000s||5.0/s||n||Y|
|15.||Sony A7 II||2400||n||3.0 / 1230||tilting||n||1/8000s||5.0/s||n||Y|
|16.||Sony A7||2400||n||3.0 / 1230||tilting||n||1/8000s||5.0/s||n||n|
|17.||Sony A7R||2400||n||3.0 / 1230||tilting||n||1/8000s||4.0/s||n||n|
|Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.|
One difference between the cameras concerns the presence of an on-board flash. The XTi has one, while the A7S does not. While the built-in flash of the XTi 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 XTi writes its imaging data to Compact Flash cards, while the A7S uses SDXC or Memory Stick PRO Duo cards.
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 XTi 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 XTi||Y||- / -||-||-||-||2.0||-||-||-|
|2.||Sony A7S||Y||stereo / mono||Y||Y||micro||2.0||Y||Y||-|
|3.||Canon T6i||Y||stereo / mono||Y||-||mini||2.0||Y||Y||-|
|4.||Canon T6s||Y||stereo / mono||Y||-||mini||2.0||Y||Y||-|
|5.||Canon T4i||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|6.||Canon T3||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|7.||Canon T2i||Y||stereo / -||Y||-||mini||2.0||-||-||-|
|8.||Canon T1i||Y||mono / mono||-||-||mini||2.0||-||-||-|
|9.||Canon XSi||Y||- / -||-||-||mini||2.0||-||-||-|
|10.||Canon 40D||Y||- / -||-||-||-||2.0||-||-||-|
|11.||Canon XT||Y||- / -||-||-||-||2.0||-||-||-|
|12.||Canon Rebel||Y||- / -||-||-||-||1.1||-||-||-|
|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 XTi does not provide wifi capability.
Both the XTi and the A7S have been discontinued, but can regularly be found used on ebay. The XTi was replaced by the Canon Xsi, 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 XTi better than the Sony A7S or vice versa? A synthesis of the relative strong points of each of the models is listed below.
Advantages of the Canon EOS Rebel XTi:
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- More compact: Is smaller (127x84mm vs 127x94mm) and thus needs less room in the bag.
- Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
- More affordable: Was introduced into a lower priced category (68 percent cheaper at launch).
- More heavily discounted: Has been available for much longer (launched in August 2006).
Arguments in favor of the Sony Alpha A7S:
- More detail: Has more megapixels (12 vs 10.1MP), which boosts linear resolution by 9%.
- Better image quality: Scores substantially higher (25 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (1.8 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (2.2 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (2.5 stops ISO advantage).
- Broader imaging potential: Can capture not only stills but also 1080/60p video.
- 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 0.49x).
- Larger screen: Has a bigger rear LCD (3.0" vs 2.5") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (921k vs 230k dots).
- 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.
- Faster burst: Shoots at higher frequency (5 vs 3 flaps/sec) to capture the decisive moment.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- Less heavy: Has a lower weight (by 67g or 12 percent) and is thus easier to take along.
- 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: Reflects 7 years and 7 months of technical progress since the XTi launch.
If the count of individual advantages (bullet points above) is taken as a guide, the A7S is the clear winner of the contest (22 : 5 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro 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 XTi 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the XTi and the A7S in practical situations. 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 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 XTi||..||+ +||..||+ +||o||4/5||Aug 2006||799||ebay.com|
|2.||Sony A7S||4/5||..||..||86/100||4.5/5||5/5||Apr 2014||2,499||ebay.com|
|3.||Canon T6i||5/5||..||..||75/100||4.5/5||4.5/5||Feb 2015||749||ebay.com|
|4.||Canon T6s||5/5||+||..||77/100||4.5/5||4.5/5||Feb 2015||649||ebay.com|
|5.||Canon T4i||4/5||+ +||..||77/100||4.5/5||4.5/5||Jun 2012||849||ebay.com|
|6.||Canon T3||..||80/100||..||69/100||4/5||4.5/5||Feb 2011||449||ebay.com|
|7.||Canon T2i||..||+ +||..||77/100||4/5||4.5/5||Feb 2010||699||ebay.com|
|8.||Canon T1i||..||+ +||..||74/100||4.5/5||4.5/5||Mar 2009||799||ebay.com|
|9.||Canon XSi||..||+ +||..||+ +||4/5||4.5/5||Jan 2008||799||ebay.com|
|10.||Canon 40D||..||+ +||..||+ +||4.5/5||4.5/5||Aug 2007||1,299||ebay.com|
|11.||Canon XT||..||80/100||..||+ +||o||..||Feb 2005||899||ebay.com|
|12.||Canon Rebel||..||..||..||+ +||..||..||Aug 2003||899||ebay.com|
|13.||Nikon Df||4/5||..||..||81/100||4/5||4/5||Nov 2013||2,749||ebay.com|
|14.||Sony A7S II||5/5||+||..||..||4.5/5||5/5||Sep 2015||2,999||ebay.com|
|15.||Sony A7 II||5/5||+||4/5||82/100||4.5/5||5/5||Nov 2014||1,999||ebay.com|
|16.||Sony A7||5/5||+ +||..||80/100||5/5||5/5||Oct 2013||1,699||ebay.com|
|17.||Sony A7R||5/5||+ +||..||82/100||4.5/5||5/5||Oct 2013||2,299||ebay.com|
|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. 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, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.
Other camera comparisons
Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu 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 XTi 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 XTi||Sony A7S|
|Camera Type||Digital single lens reflex||Mirrorless system camera|
|Camera Lens||Canon EF mount lenses||Sony E mount lenses|
|Launch Date||August 2006||April 2014|
|Launch Price||USD 799||USD 2,499|
|Sensor Specs||Canon XTi||Sony A7S|
|Sensor Format||APS-C Sensor||Full Frame Sensor|
|Sensor Size||22.2 x 14.8 mm||35.8 x 23.9 mm|
|Sensor Area||328.56 mm2||855.62 mm2|
|Sensor Diagonal||26.7 mm||43 mm|
|Sensor Resolution||10.1 Megapixels||12 Megapixels|
|Image Resolution||3888 x 2592 pixels||4240 x 2832 pixels|
|Pixel Pitch||5.71 μm||8.45 μm|
|Pixel Density||3.07 MP/cm2||1.40 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||no Video||1080/60p Video|
|ISO Setting||100 - 1,600 ISO||100 - 102,400 ISO|
|ISO Boost||no Enhancement||50 - 409,600 ISO|
|Image Processor||DIGIC II||BIONZ X|
|DXO Sensor Quality (score)||62||87|
|DXO Color Depth (bits)||22.1||23.9|
|DXO Dynamic Range (EV)||11.0||13.2|
|DXO Low Light (ISO)||664||3702|
|Screen Specs||Canon XTi||Sony A7S|
|Viewfinder Type||Optical viewfinder||Electronic viewfinder|
|Viewfinder Field of View||95%||100%|
|Viewfinder Resolution||2400k dots|
|LCD Framing||Live View|
|Rear LCD Size||2.5inch||3.0inch|
|LCD Resolution||230k dots||921k dots|
|LCD Attachment||Fixed screen||Tilting screen|
|Shooting Specs||Canon XTi||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||3 shutter flaps/s||5 shutter flaps/s|
|Electronic Shutter||no E-Shutter||YES|
|Fill Flash||Built-in Flash||no On-Board Flash|
|Storage Medium||CF cards||MS or SDXC cards|
|Second Storage Option||Single card slot||Single card slot|
|Connectivity Specs||Canon XTi||Sony A7S|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||no HDMI||micro HDMI|
|Microphone Port||no MIC socket||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 XTi||Sony A7S|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||370 shots per charge||380 shots per charge|
|In-Camera Charging||no USB charging||USB charging|
127 x 84 x 65 mm
(5.0 x 3.3 x 2.6 in)
127 x 94 x 48 mm
(5.0 x 3.7 x 1.9 in)
|Camera Weight||556 g (19.6 oz)||489 g (17.2 oz)|
Did you notice an error on this page? If so, please get in touch, so that we can correct the information.