Canon G15 vs XTi
The Canon PowerShot G15 and the Canon EOS Rebel XTi (labelled Canon 400D in some countries) are two digital cameras that were officially introduced, respectively, in September 2012 and August 2006. The G15 is a fixed lens compact, while the XTi is a DSLR. The cameras are based on a 1/1.7-inch (G15) and an APS-C (XTi) sensor. The G15 has a resolution of 12 megapixels, whereas the XTi provides 10.1 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 PowerShot G15 and the Canon EOS Rebel XTi? 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 side-by-side display below illustrates the physical size and weight of the Canon G15 and the Canon XTi. 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 width, height and depth 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 Canon XTi is notably larger (31 percent) than the Canon G15. In this context, it is worth noting that neither the G15 nor the XTi are weather-sealed.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the G15 has a lens built in, whereas the XTi is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the XTi and their specifications in the Canon EF Lens Catalog.
The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. 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 G15||107 mm||76 mm||40 mm||352 g||350||n||Sep 2012||499|
|2.||Canon XTi||127 mm||84 mm||65 mm||556 g||370||n||Aug 2006||799|
|3.||Canon T6i||132 mm||101 mm||78 mm||555 g||440||n||Feb 2015||749|
|4.||Canon T6s||132 mm||101 mm||78 mm||565 g||440||n||Feb 2015||649|
|5.||Canon SX60||128 mm||93 mm||114 mm||650 g||340||n||Sep 2014||549|
|6.||Canon G16||109 mm||76 mm||40 mm||356 g||360||n||Aug 2013||549|
|7.||Canon S120||100 mm||59 mm||29 mm||217 g||230||n||Aug 2013||449|
|8.||Canon SX50||123 mm||87 mm||106 mm||595 g||315||n||Sep 2012||429|
|9.||Canon G12||112 mm||76 mm||48 mm||401 g||370||n||Sep 2010||499|
|10.||Canon XSi||129 mm||98 mm||62 mm||524 g||500||n||Jan 2008||799|
|11.||Canon XT||127 mm||94 mm||64 mm||540 g||400||n||Feb 2005||899|
|12.||Canon Rebel||142 mm||99 mm||72 mm||649 g||400||n||Aug 2003||899|
|13.||Fujifilm X20||117 mm||70 mm||57 mm||353 g||270||n||Jan 2013||599|
|14.||Fujifilm X10||117 mm||70 mm||57 mm||350 g||270||n||Sep 2011||599|
|15.||Nikon P7800||119 mm||78 mm||50 mm||399 g||350||n||Sep 2013||549|
|16.||Panasonic LX7||111 mm||68 mm||46 mm||298 g||330||n||Jul 2012||499|
|17.||Panasonic FZ150||124 mm||82 mm||92 mm||528 g||410||n||Aug 2011||499|
|Notes: 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 G15 was launched at a lower price than the XTi, despite having a lens built in. 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 G15 features a 1/1.7-inch sensor and the Canon XTi an APS-C sensor. The sensor area in the XTi is 665 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 4.6 and 1.6. The sensor in the G15 has a native 4:3 aspect ratio, while the one in the XTi offers a 3:2 aspect.
In terms of chip-set technology, the G15 uses a more advanced image processing engine (DIGIC 5) than the XTi (DIGIC II), with benefits for noise reduction, color accuracy, and processing speed.
Despite having a smaller sensor, the Canon G15 offers a higher resolution of 12 megapixels, compared with 10.1 MP of the Canon XTi. 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 1.89μm versus 5.71μm for the XTi). However, it should be noted that the G15 is much more recent (by 6 years) than the XTi, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.
The resolution advantage of the Canon G15 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the G15 for good quality output (200 dots per inch) amounts to 20 x 15 inches or 50.8 x 38.1 cm, for very good quality (250 dpi) 16 x 12 inches or 40.6 x 30.5 cm, and for excellent quality (300 dpi) 13.3 x 10 inches or 33.9 x 25.4 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 PowerShot G15 has a native sensitivity range from ISO 80 to ISO 12800. The corresponding ISO settings for the Canon EOS Rebel XTi are ISO 100 to ISO 1600 (no boost).
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 XTi offers substantially better image quality than the G15 (overall score 16 points higher). The advantage is based on 2.2 bits higher color depth, 0.5 EV of lower dynamic range, and 2 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.
|Note: DXO values in italics represent estimates based on sensor size and age.|
Many modern cameras cannot only take still pictures, but also record videos. The G15 indeed provides movie recording capabilities, while the XTi does not. The highest resolution format that the G15 can use is 1080/24p.
Apart from body and sensor, cameras can and do differ across a range of features. The G15 and the XTi are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The adjacent table lists some of the other core features of the Canon G15 and Canon XTi along with similar information for a selection of comparators.
|1.||Canon G15||optical||n||3.0 / 922||fixed||n||1/4000s||2.1||Y||Y|
|2.||Canon XTi||optical||n||2.5 / 230||fixed||n||1/4000s||3.0||Y||n|
|3.||Canon T6i||optical||n||3.0 / 1040||swivel||Y||1/4000s||5.0||Y||n|
|4.||Canon T6s||optical||Y||3.0 / 1040||swivel||Y||1/4000s||5.0||Y||n|
|5.||Canon SX60||922||n||3.0 / 922||swivel||n||1/2000s||6.4||Y||Y|
|6.||Canon G16||optical||n||3.0 / 922||fixed||n||1/4000s||2.2||Y||Y|
|7.||Canon S120||none||n||3.0 / 922||fixed||Y||1/2000s||12.1||Y||Y|
|8.||Canon SX50||202||n||3.0 / 461||swivel||n||1/2000s||2.2||Y||Y|
|9.||Canon G12||optical||n||2.8 / 461||swivel||n||1/4000s||1.1||Y||Y|
|10.||Canon XSi||optical||n||3.0 / 230||fixed||n||1/4000s||3.5||Y||n|
|11.||Canon XT||optical||n||1.8 / 115||fixed||n||1/4000s||3.0||Y||n|
|12.||Canon Rebel||optical||n||1.8 / 118||fixed||n||1/4000s||2.5||Y||n|
|13.||Fujifilm X20||optical||n||2.8 / 460||fixed||n||1/4000s||12.0||Y||Y|
|14.||Fujifilm X10||optical||n||2.8 / 460||fixed||n||1/4000s||10.0||Y||Y|
|15.||Nikon P7800||921||n||3.0 / 921||swivel||n||1/4000s||8.0||Y||Y|
|16.||Panasonic LX7||optional||n||3.0 / 920||fixed||n||1/4000s||11.0||Y||Y|
|17.||Panasonic FZ150||202||n||3.0 / 460||swivel||n||1/2000s||12.0||Y||Y|
The G15 writes its imaging data to SDXC cards, while the XTi uses Compact Flash 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 PowerShot G15 and Canon EOS Rebel XTi and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Canon G15||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|2.||Canon XTi||Y||- / -||-||-||-||2.0||-||-||-|
|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 SX60||Y||stereo / mono||Y||-||mini||2.0||Y||Y||-|
|6.||Canon G16||Y||stereo / mono||-||-||mini||2.0||Y||-||-|
|7.||Canon S120||-||stereo / mono||-||-||mini||2.0||Y||-||-|
|8.||Canon SX50||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|9.||Canon G12||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|10.||Canon XSi||Y||- / -||-||-||mini||2.0||-||-||-|
|11.||Canon XT||Y||- / -||-||-||-||2.0||-||-||-|
|12.||Canon Rebel||Y||- / -||-||-||-||1.1||-||-||-|
|13.||Fujifilm X20||Y||stereo / mono||-||-||micro||2.0||-||-||-|
|14.||Fujifilm X10||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|15.||Nikon P7800||Y||stereo / mono||Y||-||mini||2.0||-||-||-|
|16.||Panasonic LX7||Y||stereo / mono||-||-||mini||2.0||-||-||-|
|17.||Panasonic FZ150||Y||stereo / -||-||-||mini||2.0||-||-||-|
Both the G15 and the XTi have been discontinued, but can regularly be found used on eBay. The XTi was replaced by the Canon Xsi, while the G15 was followed by the Canon G16. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon website.
So how do things add up? Is there a clear favorite between the Canon G15 and the Canon XTi? Which camera is better? A synthesis of the relative strong points of each of the models is listed below.
Advantages of the Canon PowerShot G15:
- More detail: Offers more megapixels (12 vs 10.1MP) with a 7% higher linear resolution.
- Better jpgs: Has a more modern image processing engine (DIGIC 5 vs DIGIC II).
- Broader imaging potential: Can record not only still images but also 1080/24p movies.
- 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 (922k vs 230k dots).
- Ready to shoot: Comes with a built-in lens, while the XTi requires a separate lens.
- More compact: Is smaller (107x76mm vs 127x84mm) and thus needs less room in the bag.
- Less heavy: Is lighter even though it comes with a built-in lens (unlike the XTi).
- Sharper images: Has hand-shake reducing image stabilization built-in.
- More affordable: Was introduced at a lower price, despite coming with a built-in lens.
- More modern: Reflects 6 years of technical progress since the XTi launch.
Arguments in favor of the Canon EOS Rebel XTi:
- Better image quality: Scores substantially higher (16 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (2.2 bits more color depth).
- Better low-light sensitivity: Can shoot in dim conditions (2 stops ISO advantage).
- Faster burst: Shoots at higher frequency (3 vs 2.1 flaps/sec) to capture the decisive moment.
- More flexible: Makes it possible to change lenses and thus to use specialty optics.
- More heavily discounted: Has been around for much longer (launched in August 2006).
If the count of relative strengths (bullet points above) is taken as a measure, the G15 is the clear winner of the match-up (11 : 6 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision. 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 G15 and the Canon XTi place the cameras among the top in their class? Find out in the latest Best Travel-Zoom Camera and Best DSLR 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 remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the G15 or the XTi. 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 hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear 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 G15||4/5||+||..||76/100||4.5/5||4.5/5||Sep 2012||499|
|2.||Canon XTi||..||+ +||..||+ +||o||4/5||Aug 2006||799|
|3.||Canon T6i||5/5||..||..||75/100||4.5/5||4.5/5||Feb 2015||749|
|4.||Canon T6s||5/5||+||..||77/100||4.5/5||4.5/5||Feb 2015||649|
|5.||Canon SX60||3/5||+ +||..||75/100||4/5||4.5/5||Sep 2014||549|
|6.||Canon G16||4/5||+||..||..||4.5/5||4.5/5||Aug 2013||549|
|7.||Canon S120||..||+ +||..||..||4.5/5||4.5/5||Aug 2013||449|
|8.||Canon SX50||3/5||+ +||..||72/100||4.5/5||4.5/5||Sep 2012||429|
|9.||Canon G12||4/5||+||..||73/100||4.5/5||4.5/5||Sep 2010||499|
|10.||Canon XSi||..||+ +||..||+ +||4/5||4.5/5||Jan 2008||799|
|11.||Canon XT||..||80/100||..||+ +||o||..||Feb 2005||899|
|12.||Canon Rebel||..||..||..||+ +||..||..||Aug 2003||899|
|13.||Fujifilm X20||4/5||+ +||..||77/100||4.5/5||5/5||Jan 2013||599|
|14.||Fujifilm X10||..||..||..||76/100||4/5||4.5/5||Sep 2011||599|
|15.||Nikon P7800||3/5||..||..||..||4/5||4.5/5||Sep 2013||549|
|16.||Panasonic LX7||3/5||+ +||..||75/100||4/5||4.5/5||Jul 2012||499|
|17.||Panasonic FZ150||3/5||+ +||..||76/100||4/5||4.5/5||Aug 2011||499|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The review scores listed above should be treated with care, though. The ratings are only valid when referring 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? In case you would like to check on the differences and similarities of other camera models, just make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.
Specifications: Canon G15 vs Canon XTi
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 G15||Canon XTi|
|Camera Type||Fixed lens compact camera||Digital single lens reflex|
|Camera Lens||28-140mm f/1.8-2.8||Canon EF mount lenses|
|Launch Date||September 2012||August 2006|
|Launch Price||USD 499||USD 799|
|Sensor Specs||Canon G15||Canon XTi|
|Sensor Format||1/1.7" Sensor||APS-C Sensor|
|Sensor Size||7.6 x 5.7 mm||22.2 x 14.8 mm|
|Sensor Area||43.32 mm2||328.56 mm2|
|Sensor Diagonal||9.5 mm||26.7 mm|
|Sensor Resolution||12 Megapixels||10.1 Megapixels|
|Image Resolution||4000 x 3000 pixels||3888 x 2592 pixels|
|Pixel Pitch||1.89 μm||5.71 μm|
|Pixel Density||27.70 MP/cm2||3.07 MP/cm2|
|Moiré control||Anti-Alias filter||Anti-Alias filter|
|Movie Capability||1080/24p Video||no Video|
|ISO Setting||80 - 12,800 ISO||100 - 1,600 ISO|
|Image Processor||DIGIC 5||DIGIC II|
|DXO Sensor Quality (score)||46||62|
|DXO Color Depth (bits)||19.9||22.1|
|DXO Dynamic Range (EV)||11.5||11.0|
|DXO Low Light (ISO)||165||664|
|Screen Specs||Canon G15||Canon XTi|
|Viewfinder Type||Optical viewfinder||Optical viewfinder|
|Viewfinder Field of View||80%||95%|
|LCD Framing||Live View|
|Rear LCD Size||3.0inch||2.5inch|
|LCD Resolution||922k dots||230k dots|
|LCD Attachment||Fixed screen||Fixed screen|
|Shooting Specs||Canon G15||Canon XTi|
|Focus System||Contrast-detect AF||Phase-detect AF|
|Continuous Shooting||2.1 shutter flaps/s||3 shutter flaps/s|
|Fill Flash||Built-in Flash||Built-in Flash|
|Storage Medium||SDXC cards||CF cards|
|Second Storage Option||Single card slot||Single card slot|
|Connectivity Specs||Canon G15||Canon XTi|
|USB Connector||USB 2.0||USB 2.0|
|HDMI Port||mini HDMI||no HDMI|
|Wifi Support||no Wifi||no Wifi|
|Body Specs||Canon G15||Canon XTi|
|Battery Life (CIPA)||350 shots per charge||370 shots per charge|
107 x 76 x 40 mm
(4.2 x 3.0 x 1.6 in)
127 x 84 x 65 mm
(5.0 x 3.3 x 2.6 in)
|Camera Weight||352 g (12.4 oz)||556 g (19.6 oz)|
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