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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.

Headline Specifications
Canon G15
versus
Canon XTi
Canon G15   Canon XTi
Fixed lens compact camera Digital single lens reflex
28-140mm f/1.8-2.8 Canon EF mount lenses
12 MP, 1/1.7" Sensor 10.1 MP, APS-C Sensor
1080/24p Video no Video
ISO 80-12,800 ISO 100-1,600
Optical viewfinder Optical viewfinder
3.0 LCD, 922k dots 2.5 LCD, 230k dots
Fixed screen (not touch-sensitive) Fixed screen (not touch-sensitive)
2.1 shutter flaps per second 3 shutter flaps per second
350 shots per battery charge370 shots per battery charge
107 x 76 x 40 mm, 352 g 127 x 84 x 65 mm, 556 g

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.

Body comparison

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.

Size Canon G15 vs Canon XTi
Compare G15 versus XTi top
Comparison G15 or XTi rear

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.

Concerning battery life, the G15 gets 350 shots out of its NB-10L battery, while the XTi can take 370 images on a single charge of its NB-2LH power pack.

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.

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Body Specifications
    Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Canon G15 107 mm 76 mm 40 mm 352 g 350 n Sep 2012 499i
2.
 
Canon XTi 127 mm 84 mm 65 mm 556 g 370 n Aug 2006 799i
3.
 
Canon T6i 132 mm 101 mm 78 mm 555 g 440 n Feb 2015 749i
4.
 
Canon T6s 132 mm 101 mm 78 mm 565 g 440 n Feb 2015 649i
5.
 
Canon SX60 128 mm 93 mm 114 mm 650 g 340 n Sep 2014 549i
6.
 
Canon G16 109 mm 76 mm 40 mm 356 g 360 n Aug 2013 549 i
7.
 
Canon S120 100 mm 59 mm 29 mm 217 g 230 n Aug 2013 449i
8.
 
Canon SX50 123 mm 87 mm 106 mm 595 g 315 n Sep 2012 429i
9.
 
Canon G12 112 mm 76 mm 48 mm 401 g 370 n Sep 2010 499i
10.
 
Canon XSi 129 mm 98 mm 62 mm 524 g 500 n Jan 2008 799i
11.
 
Canon XT 127 mm 94 mm 64 mm 540 g 400 n Feb 2005 899i
12.
 
Canon Rebel 142 mm 99 mm 72 mm 649 g 400 n Aug 2003 899i
13.
 
Fujifilm X20 117 mm 70 mm 57 mm 353 g 270 n Jan 2013 599i
14.
 
Fujifilm X10 117 mm 70 mm 57 mm 350 g 270 n Sep 2011 599i
15.
 
Nikon P7800 119 mm 78 mm 50 mm 399 g 350 n Sep 2013 549i
16.
 
Panasonic LX7 111 mm 68 mm 46 mm 298 g 330 n Jul 2012 499i
17.
 
Panasonic FZ150 124 mm 82 mm 92 mm 528 g 410 n Aug 2011 499i
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.

Sensor comparison

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.

Canon G15 and Canon XTi sensor measures

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).

G15 versus XTi MP

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.

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Sensor Characteristics
    Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Canon G15 1/1.7 12.0 4000 30001080/24p19.911.516546
2.
 
Canon XTi APS-C 10.1 3888 2592none22.111.066462
3.
 
Canon T6i APS-C 24.0 6000 40001080/30p22.712.091971
4.
 
Canon T6s APS-C 24.0 6000 40001080/30p22.612.091570
5.
 
Canon SX60 1/2.3 14.2 4608 30721080/60p19.210.812739
6.
 
Canon G16 1/1.7 12.0 4000 30001080/60p21.011.723054
7.
 
Canon S120 1/1.7 12.0 4000 30001080/60p21.311.924656
8.
 
Canon SX50 1/2.3 12.0 4000 30001080/24p20.311.217947
9.
 
Canon G12 1/1.7 10.0 3648 2736720/24p20.411.216147
10.
 
Canon XSi APS-C 12.2 4272 2848none21.910.869261
11.
 
Canon XT APS-C 8.0 3456 2304none21.810.863760
12.
 
Canon Rebel APS-C 6.3 3072 2048none21.010.854455
13.
 
Fujifilm X20 2/3 12.0 4000 30001080/60p20.110.9-46246
14.
 
Fujifilm X10 2/3 12.0 4000 30001080/30p20.511.324550
15.
 
Nikon P7800 1/1.7 12.0 4000 30001080/30p21.211.720054
16.
 
Panasonic LX7 1/1.7 10.0 3648 27361080/60p20.711.714750
17.
 
Panasonic FZ150 1/2.3 12.0 4000 30001080/60p19.410.913240
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.

Feature comparison

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.

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Core Features
    Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Mech
Shutter
Speed
Shutter
Flaps
(1/sec)
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Canon G15optical n3.0 / 922 fixed n 1/4000s 2.1 Y Y
2.
 
Canon XTioptical n2.5 / 230 fixed n 1/4000s 3.0 Y n
3.
 
Canon T6ioptical n3.0 / 1040 swivel Y 1/4000s 5.0 Y n
4.
 
Canon T6soptical Y3.0 / 1040 swivel Y 1/4000s 5.0 Y n
5.
 
Canon SX60922 n3.0 / 922 swivel n 1/2000s 6.4 Y Y
6.
 
Canon G16optical n3.0 / 922 fixed n 1/4000s 2.2 Y Y
7.
 
Canon S120none n3.0 / 922 fixed Y 1/2000s 12.1 Y Y
8.
 
Canon SX50202 n3.0 / 461 swivel n 1/2000s 2.2 Y Y
9.
 
Canon G12optical n2.8 / 461 swivel n 1/4000s 1.1 Y Y
10.
 
Canon XSioptical n3.0 / 230 fixed n 1/4000s 3.5 Y n
11.
 
Canon XToptical n1.8 / 115 fixed n 1/4000s 3.0 Y n
12.
 
Canon Rebeloptical n1.8 / 118 fixed n 1/4000s 2.5 Y n
13.
 
Fujifilm X20optical n2.8 / 460 fixed n 1/4000s 12.0 Y Y
14.
 
Fujifilm X10optical n2.8 / 460 fixed n 1/4000s 10.0 Y Y
15.
 
Nikon P7800921 n3.0 / 921 swivel n 1/4000s 8.0 Y Y
16.
 
Panasonic LX7optional n3.0 / 920 fixed n 1/4000s 11.0 Y Y
17.
 
Panasonic FZ150202 n3.0 / 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.

Connectivity comparison

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.

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Input-Output Connections
    Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Canon G15Ystereo / mono--mini2.0---
2.
 
Canon XTiY- / ----2.0---
3.
 
Canon T6iYstereo / monoY-mini2.0YY-
4.
 
Canon T6sYstereo / monoY-mini2.0YY-
5.
 
Canon SX60Ystereo / monoY-mini2.0YY-
6.
 
Canon G16Ystereo / mono--mini2.0Y--
7.
 
Canon S120-stereo / mono--mini2.0Y--
8.
 
Canon SX50Ystereo / mono--mini2.0---
9.
 
Canon G12Ystereo / mono--mini2.0---
10.
 
Canon XSiY- / ---mini2.0---
11.
 
Canon XTY- / ----2.0---
12.
 
Canon RebelY- / ----1.1---
13.
 
Fujifilm X20Ystereo / mono--micro2.0---
14.
 
Fujifilm X10Ystereo / mono--mini2.0---
15.
 
Nikon P7800Ystereo / monoY-mini2.0---
16.
 
Panasonic LX7Ystereo / mono--mini2.0---
17.
 
Panasonic FZ150Ystereo / ---mini2.0---

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.

Review summary

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.

G15 11:06 XTi

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.

Expert reviews

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.

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Expert Camera Reviews
     Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Canon G154/5+..76/1004.5/54.5/5 Sep 2012 499i
2.
 
Canon XTi..+ +..+ +o4/5 Aug 2006 799i
3.
 
Canon T6i5/5....75/1004.5/54.5/5 Feb 2015 749i
4.
 
Canon T6s5/5+..77/1004.5/54.5/5 Feb 2015 649i
5.
 
Canon SX603/5+ +..75/1004/54.5/5 Sep 2014 549i
6.
 
Canon G164/5+....4.5/54.5/5 Aug 2013 549 i
7.
 
Canon S120..+ +....4.5/54.5/5 Aug 2013 449i
8.
 
Canon SX503/5+ +..72/1004.5/54.5/5 Sep 2012 429i
9.
 
Canon G124/5+..73/1004.5/54.5/5 Sep 2010 499i
10.
 
Canon XSi..+ +..+ +4/54.5/5 Jan 2008 799i
11.
 
Canon XT..80/100..+ +o.. Feb 2005 899i
12.
 
Canon Rebel......+ +.... Aug 2003 899i
13.
 
Fujifilm X204/5+ +..77/1004.5/55/5 Jan 2013 599i
14.
 
Fujifilm X10......76/1004/54.5/5 Sep 2011 599i
15.
 
Nikon P78003/5......4/54.5/5 Sep 2013 549i
16.
 
Panasonic LX73/5+ +..75/1004/54.5/5 Jul 2012 499i
17.
 
Panasonic FZ1503/5+ +..76/1004/54.5/5 Aug 2011 499i
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.

Canon G15:
Check Ebay offers
Canon XTi:
Check Ebay offers

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.

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    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 Specifications
    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 Technology CMOS CMOS
    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
    Crop Factor 4.6x 1.6x
    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%
    Viewfinder Magnification 0.49x
    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
    External Flash Hotshoe Hotshoe
    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 Type NB-10L NB-2LH
    Battery Life (CIPA)350 shots per charge370 shots per charge
    Body Dimensions 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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