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Canon G1 X Mark III vs T7i

The Canon PowerShot G1 X Mark III and the Canon EOS Rebel T7i (labelled Canon 800D in some countries) are two digital cameras that were announced, respectively, in October 2017 and February 2017. The G1X Mark III is a fixed lens compact, while the T7i is a DSLR. Both cameras are equipped with an APS-C sensor. Both cameras offer a resolution of 24 megapixels.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Canon G1 X Mark III versus Canon T7i
Canon G1 X Mark III Canon T7i
Fixed lens compact camera Digital single lens reflex
24-72mm f/2.8-5.6 Canon EF mount lenses
24 MP, APS-C Sensor 24 MP, APS-C Sensor
1080/60p Video 1080/60p Video
ISO 100-25,600 ISO 100-25,600 (100 - 51,200)
Electronic viewfinder (2360k dots) Optical viewfinder
3.0 LCD, 1040k dots 3.0 LCD, 1040k dots
Swivel touchscreen Swivel touchscreen
9 shutter flaps per second 6 shutter flaps per second
Weathersealed bodynot weather sealed
200 shots per battery charge600 shots per battery charge
115 x 78 x 51 mm, 399 g 131 x 100 x 76 mm, 532 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon PowerShot G1 X Mark III and the Canon EOS Rebel T7i? 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 G1 X Mark III and the Canon T7i. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter.

Size Canon G1 X Mark III vs Canon T7i
Compare G1X Mark III versus T7i top
Comparison G1X Mark III or T7i rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon T7i is considerably larger (46 percent) than the Canon G1 X Mark III. It is worth mentioning in this context that the G1X Mark III 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 and possibly misleading, as the G1X Mark III has a lens built in, whereas the T7i 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 T7i and their specifications in the Canon EF Lens Catalog.

Concerning battery life, the G1X Mark III gets 200 shots out of its NB-13L battery, while the T7i can take 600 images on a single charge of its LP-E17 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you would like to visualize and compare a different camera combination, just use the right or left arrows in the table to switch to the respective camera. Alternatively, you can also navigate to the CAM-parator app and make your selection from the full list of cameras there.

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Body Specifications
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life 1
Weather
Sealing
Camera
Launch 2
Launch
Price (USD)
Street
Price
 
Canon G1 X Mark III 4.5 in 3.1 in 2.0 in 14.1 oz 200 Y Oct 2017 1,299 i
 
Canon T7i 5.2 in 3.9 in 3.0 in 18.8 oz 600 n Feb 2017 749i
 
Canon T8i 5.2 in 4.1 in 3.0 in 18.2 oz 800 n Feb 2020 749 i
 
Canon T7 5.1 in 4.0 in 3.1 in 16.8 oz 500 n Feb 2018 449 i
 
Canon 6D Mark II 5.7 in 4.4 in 3.0 in 27.0 oz 1200 Y Jun 2017 1,999 i
 
Canon 77D 5.2 in 3.9 in 3.0 in 19.0 oz 600 n Feb 2017 899 i
 
Canon 80D 5.5 in 4.1 in 3.1 in 25.8 oz 960 Y Feb 2016 1,199i
 
Canon SX540 4.7 in 3.2 in 3.6 in 15.6 oz 205 n Jan 2016 399 i
 
Canon T6i 5.2 in 4.0 in 3.1 in 19.6 oz 440 n Feb 2015 749i
 
Canon T5i 5.2 in 3.9 in 3.1 in 20.5 oz 440 n Mar 2013 649i
 
Fujifilm X100V 5.0 in 3.0 in 2.1 in 16.9 oz 420 Y Feb 2020 1,399 i
 
Fujifilm X-T3 5.2 in 3.7 in 2.3 in 19.0 oz 390 Y Sep 2018 1,499 i
 
Fujifilm X100F 5.0 in 3.0 in 2.0 in 16.5 oz 390 n Jan 2017 1,299i
 
Nikon D7500 5.4 in 4.1 in 2.9 in 25.4 oz 950 Y Apr 2017 1,299 i
 
Sony A6300 4.7 in 2.6 in 1.9 in 14.3 oz 400 Y Feb 2016 999i
 
Sony A6500 4.7 in 2.6 in 2.1 in 16.0 oz 350 Y Oct 2016 1,399i
 
Sony RX10 III 5.2 in 3.7 in 5.0 in 37.1 oz 420 Y Mar 2016 1,499 i
Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
(1) Number of images that can be taken on a full battery charge according to the CIPA-standard; (2) Official announcement.

The price is, of course, an important factor in any camera decision. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. 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.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants 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. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Both cameras under consideration feature an APS-C sensor and have a format factor (sometimes also referred to as "crop factor") of 1.5. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Canon G1 X Mark III and Canon T7i sensor measures

The two cameras under review do not only share the same sensor size, but also offer an identical resolution of 24 megapixels. This similarity in sensor specs implies that both the G1X Mark III and the T7i have the same pixel density, as well as the same pixel size. It should, however, be noted that the G1X Mark III is a somewhat more recent model (by 7 months) than the T7i, and its sensor might have benefitted from technological advances during this time.

The Canon PowerShot G1 X Mark III has a native sensitivity range from ISO 100 to ISO 25600. The corresponding ISO settings for the Canon EOS Rebel T7i are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 100-51200.

G1X Mark III versus T7i MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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 following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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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
 
Canon G1 X Mark III APS-C 24.0 6000 40001080/60p........
 
Canon T7i APS-C 24.0 6000 40001080/60p........
 
Canon T8i APS-C 24.0 6000 40004K/24p........
 
Canon T7 APS-C 24.0 6000 40001080/30p........
 
Canon 6D Mark II Full Frame 26.0 6240 41601080/60p24.411.9286285
 
Canon 77D APS-C 24.0 6000 40001080/60p23.613.397178
 
Canon 80D APS-C 24.0 6000 40001080/60p23.613.2113579
 
Canon SX540 1/2.3 20.2 5184 38881080/60p........
 
Canon T6i APS-C 24.0 6000 40001080/30p22.712.091971
 
Canon T5i APS-C 17.9 5184 34561080/30p21.711.268161
 
Fujifilm X100V APS-C 26.0 6240 41604K/30p........
 
Fujifilm X-T3 APS-C 26.0 6240 41604K/60p........
 
Fujifilm X100F APS-C 24.0 6000 40001080/60p........
 
Nikon D7500 APS-C 20.7 5568 37124K/30p24.314.0148386
 
Sony A6300 APS-C 24.0 6000 40004K/30p24.413.7143785
 
Sony A6500 APS-C 24.0 6000 40004K/30p24.513.7140585
 
Sony RX10 III 1-inch 20.0 5472 36484K/30p23.112.647270

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, and both provide the same movie specifications (1080/60p).

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the G1X Mark III has an electronic viewfinder (2360k 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 Canon G1 X Mark III and Canon T7i in connection with corresponding information for a sample of similar cameras.

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Core Features
  Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Size
(inch)
LCD
Resolution
(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
 
Canon G1 X Mark III2360 n 3.0 1040 swivel Y 1/2000s 9.0 Y Y
 
Canon T7ioptical n 3.0 1040 swivel Y 1/4000s 6.0 Y n
 
Canon T8ioptical n 3.0 1040 swivel Y 1/4000s 7.5 Y n
 
Canon T7optical n 3.0 920 fixed n 1/4000s 3.0 Y n
 
Canon 6D Mark IIoptical Y 3.0 1040 swivel Y 1/4000s 6.5 n n
 
Canon 77Doptical Y 3.0 1040 swivel Y 1/4000s 6.0 Y n
 
Canon 80Doptical Y 3.0 1040 swivel Y 1/8000s 7.0 Y n
 
Canon SX540none n 3.0 461 fixed n 1/2000s 5.9 Y Y
 
Canon T6ioptical n 3.0 1040 swivel Y 1/4000s 5.0 Y n
 
Canon T5ioptical n 3.0 1040 swivel Y 1/4000s 5.0 Y n
 
Fujifilm X100V3690 n 3.0 1620 tilting Y 1/4000s 11.0 Y n
 
Fujifilm X-T33690 n 3.0 1040 tilting Y 1/8000s 11.0 n n
 
Fujifilm X100F2360 n 3.0 1040 fixed n 1/4000s 8.0 Y n
 
Nikon D7500optical Y 3.2 922 tilting Y 1/8000s 8.0 Y n
 
Sony A63002359 n 3.0 922 tilting n 1/4000s 11.0 Y n
 
Sony A65002359 n 3.0 922 tilting Y 1/4000s 11.0 Y Y
 
Sony RX10 III2359 Y 3.0 1229 tilting n 1/2000s 14.0 Y Y
Both cameras have an articulated rear screen that can be turned to be front-facing. This feature will be particularly appreciated by vloggers and photographers who are interested in taking selfies.

The Canon G1 X Mark III has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

Concerning the storage of imaging data, both the G1X Mark III and the T7i write their files to SDXC cards. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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 G1 X Mark III and Canon EOS Rebel T7i 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
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
 
Canon G1 X Mark IIIYstereomono--micro2.0YYY
 
Canon T7iYstereomonoY-mini2.0YYY
 
Canon T8iYstereomonoY-mini2.0Y-Y
 
Canon T7Ymonomono--mini2.0YY-
 
Canon 6D Mark IIYstereomonoY-mini2.0YYY
 
Canon 77DYstereomonoY-mini2.0YYY
 
Canon 80DYstereomonoYYmini2.0YY-
 
Canon SX540-stereomono--mini2.0YY-
 
Canon T6iYstereomonoY-mini2.0YY-
 
Canon T5iYstereomonoY-mini2.0---
 
Fujifilm X100VYstereomonoY-micro3.1Y-Y
 
Fujifilm X-T3YstereomonoYYmicro3.1Y-Y
 
Fujifilm X100FYstereomonoY-micro2.0Y--
 
Nikon D7500YstereomonoYYmini2.0Y-Y
 
Sony A6300YstereomonoY-micro2.0YY-
 
Sony A6500YstereomonoY-micro2.0YY-
 
Sony RX10 IIIYstereomonoYYmicro2.0YY-

It is notable that the T7i has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The G1X Mark III does not feature such a mic input.

The G1X Mark III is a recent model that features in the current product line-up of Canon. In contrast, the T7i has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the T7i was succeeded by the Canon T8i. 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 G1 X Mark III and the Canon T7i? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.


Reasons to prefer the Canon PowerShot G1 X Mark III:

  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Faster burst: Shoots at higher frequency (9 vs 6 flaps/sec) to capture the decisive moment.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Ready to shoot: Comes with a built-in lens, while the T7i requires a separate lens.
  • More compact: Is smaller (115x78mm vs 131x100mm) and thus needs less room in the bag.
  • Less heavy: Is lighter even though it comes with a built-in lens (unlike the T7i).
  • Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
  • Sharper images: Has hand-shake reducing image stabilization built-in.
  • More modern: Is somewhat more recent (announced 7 months after the T7i).


Advantages of the Canon EOS Rebel T7i:

  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Faster shutter: Has higher mechanical shutter speed (1/4000s vs 1/2000s) to freeze action.
  • More flexible: Makes it possible to change lenses and thus to use specialty optics.
  • Longer lasting: Gets more shots (600 versus 200) out of a single battery charge.
  • More heavily discounted: Has been on the market for longer (launched in February 2017).

If the count of relative strengths (bullet points above) is taken as a measure, the G1X Mark III emerges as the winner of the contest (9 : 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 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.

G1X Mark III 09:06 T7i

How about other alternatives? Do the specifications of the Canon G1 X Mark III and the Canon T7i 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the G1X Mark III or the T7i. 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 where reviews by experts come in. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). 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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Review Scores
  Camera
Model
camera
  labs  
dp
review  
ephoto
  zine  
imaging
resource
photography
  blog  
Camera
Launch
Launch
Price (USD)
Street
Price
 
Canon G1 X Mark III+79/1004.5/5..4.5/5 Oct 2017 1,299 i
 
Canon T7i..80/1004.5/54/54/5 Feb 2017 749i
 
Canon T8i.......... Feb 2020 749 i
 
Canon T7o..3.5/5..3.5/5 Feb 2018 449 i
 
Canon 6D Mark II+80/1004.5/54/54/5 Jun 2017 1,999 i
 
Canon 77D..82/1004.5/54.5/54/5 Feb 2017 899 i
 
Canon 80D+ +84/1004.5/54.5/54.5/5 Feb 2016 1,199i
 
Canon SX540.......... Jan 2016 399 i
 
Canon T6i..75/1004.5/54.5/54.5/5 Feb 2015 749i
 
Canon T5i..76/1004.5/54.5/54.5/5 Mar 2013 649i
 
Fujifilm X100V+ +86/1005/5..4.5/5 Feb 2020 1,399 i
 
Fujifilm X-T3+ +88/1005/55/55/5 Sep 2018 1,499 i
 
Fujifilm X100F+83/1004.5/5..4.5/5 Jan 2017 1,299i
 
Nikon D7500+ +86/1005/54.5/54.5/5 Apr 2017 1,299 i
 
Sony A6300+85/1005/55/55/5 Feb 2016 999i
 
Sony A6500+ +85/1004.5/55/54.5/5 Oct 2016 1,399i
 
Sony RX10 III+84/1004.5/54.5/54.5/5 Mar 2016 1,499 i
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated with care, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, 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.

Canon G1 X Mark III:
Check Amazon price
Canon T7i:
Check Ebay offers

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 use the search menu below. 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 G1 X Mark III vs Canon T7i

    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 G1 X Mark III Canon T7i
    Camera Type Fixed lens compact camera Digital single lens reflex
    Camera Lens 24-72mm f/2.8-5.6 Canon EF mount lenses
    Launch Date October 2017 February 2017
    Launch Price USD 1,299 USD 749
    Sensor Specs Canon G1 X Mark III Canon T7i
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor APS-C Sensor
    Sensor Size 22.3 x 14.9 mm 22.3 x 14.9 mm
    Sensor Area 332.27 mm2 332.27 mm2
    Sensor Diagonal 26.8 mm 26.8 mm
    Crop Factor 1.5x 1.6x
    Sensor Resolution 24 Megapixels 24 Megapixels
    Image Resolution 6000 x 4000 pixels 6000 x 4000 pixels
    Pixel Pitch 3.72 μm 3.72 μm
    Pixel Density 7.22 MP/cm2 7.22 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability 1080/60p Video 1080/60p Video
    ISO Setting 100 - 25,600 ISO 100 - 25,600 ISO
    ISO Boost no Enhancement 100 - 51,200 ISO
    Image Processor DIGIC 7 DIGIC 7
    Screen Specs Canon G1 X Mark III Canon T7i
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 95%
    Viewfinder Magnification 0.51x
    Viewfinder Resolution 2360k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1040k dots 1040k dots
    LCD Attachment Swivel screen Swivel screen
    Touch Input Touchscreen Touchscreen
    Shooting Specs Canon G1 X Mark III Canon T7i
    Focus System On-Sensor Phase-detect Phase-detect AF
    Manual Focusing AidFocus Peakingno Peaking Feature
    Continuous Shooting 9 shutter flaps/s 6 shutter flaps/s
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Fill Flash Build-in Flash Build-in Flash
    Storage Medium SDXC cards SDXC cards
    Second Storage Option Single card slot Single card slot
    UHS card support UHS-I UHS-I
    Connectivity Specs Canon G1 X Mark III Canon T7i
    External Flash Hotshoe Hotshoe
    USB Connector USB 2.0 USB 2.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support Wifi built-in Wifi built-in
    Near-Field Communication NFC built-in NFC built-in
    Bluetooth Support Bluetooth built-in Bluetooth built-in
    Body Specs Canon G1 X Mark III Canon T7i
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type NB-13L LP-E17
    Battery Life (CIPA)200 shots per charge600 shots per charge
    Body Dimensions 115 x 78 x 51 mm
    (4.5 x 3.1 x 2.0 in)
    131 x 100 x 76 mm
    (5.2 x 3.9 x 3.0 in)
    Camera Weight 399 g (14.1 oz) 532 g (18.8 oz)

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