Canon G7 X Mark III vs SX420
The Canon PowerShot G7 X Mark III and the Canon PowerShot SX420 IS are two digital cameras that were announced, respectively, in July 2019 and January 2016. Both the G7X Mark III and the SX420 are fixed lens compact cameras that are based on an one-inch (G7X Mark III) and a 1/2.3-inch (SX420) sensor. The G7X Mark III has a resolution of 20 megapixels, whereas the SX420 provides 19.9 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 G7 X Mark III and the Canon PowerShot SX420 IS? 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 G7 X Mark III and the Canon SX420. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth measures are rounded to the nearest millimeter.
The G7X Mark III can be obtained in two different colors (black, silver), while the SX420 is also available in two color-versions, but different ones (black, red).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon SX420 is notably larger (12 percent) than the Canon G7 X Mark III. Moreover, the SX420 is markedly heavier (7 percent) than the G7X Mark III. In this context, it is worth noting that neither the G7X Mark III nor the SX420 are weather-sealed.
Concerning battery life, the G7X Mark III gets 235 shots out of its NB-13L battery, while the SX420 can take 195 images on a single charge of its NB-11LH power pack. The power pack in the G7X Mark III can be charged via the USB port, so that it is not always necessary to take the battery charger along 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 G7 X Mark III||105 mm||61 mm||41 mm||304 g||235||n||Jul 2019||749|
|2.||Canon SX420||104 mm||69 mm||85 mm||325 g||195||n||Jan 2016||299|
|3.||Canon G5 X Mark II||111 mm||61 mm||46 mm||340 g||230||n||Jul 2019||899|
|4.||Canon SX740||110 mm||64 mm||40 mm||299 g||265||n||Jul 2018||399|
|5.||Canon SX430||104 mm||69 mm||85 mm||323 g||195||n||Jan 2017||299|
|6.||Canon SX730||110 mm||64 mm||40 mm||300 g||250||n||Apr 2017||399|
|7.||Canon G7 X Mark II||106 mm||61 mm||42 mm||319 g||265||n||Feb 2016||699|
|8.||Canon G5 X||112 mm||76 mm||44 mm||353 g||210||n||Oct 2015||799|
|9.||Canon SX410||104 mm||69 mm||85 mm||325 g||185||n||Feb 2015||279|
|10.||Canon SX610||105 mm||61 mm||27 mm||191 g||270||n||Jan 2015||249|
|11.||Canon SX710||113 mm||66 mm||35 mm||269 g||230||n||Jan 2015||349|
|12.||Canon G7 X||103 mm||60 mm||40 mm||304 g||210||n||Sep 2014||699|
|13.||Leica C-LUX||113 mm||67 mm||46 mm||340 g||370||n||Jun 2018||1,049|
|14.||Panasonic FZ1000 II||136 mm||97 mm||131 mm||810 g||350||n||Feb 2019||899|
|15.||Panasonic ZS200||111 mm||65 mm||45 mm||340 g||370||n||Feb 2018||799|
|16.||Sony ZV-1||105 mm||60 mm||44 mm||294 g||260||n||May 2020||799|
|17.||Sony RX100 VI||102 mm||58 mm||43 mm||301 g||240||n||Jun 2018||1,199|
|Notes: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.|
Any camera decision will obviously take relative prices into account. 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 SX420 was launched at a markedly lower price (by 60 percent) than the G7X Mark III, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. 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 generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels 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 more expensive and lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Canon G7 X Mark III features an one-inch sensor and the Canon SX420 a 1/2.3-inch sensor. The sensor area in the SX420 is 76 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.7 and 5.6. The sensor in the G7X Mark III has a native 3:2 aspect ratio, while the one in the SX420 offers a 4:3 aspect.
In terms of chip-set technology, the G7X Mark III uses a more advanced image processing engine (DIGIC 8) than the SX420 (DIGIC 4+), with benefits for noise reduction, color accuracy, and processing speed.
With 20MP, the G7X Mark III offers a slightly higher resolution than the SX420 (19.9MP), but the G7X Mark III nevertheless has larger individual pixels (pixel pitch of 2.41μm versus 1.19μm for the SX420) due to its larger sensor. Moreover, the G7X Mark III is a much more recent model (by 3 years and 6 months) than the SX420, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the SX420 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
The Canon PowerShot G7 X Mark III has a native sensitivity range from ISO 125 to ISO 12800, which can be extended to ISO 125-25600. The corresponding ISO settings for the Canon PowerShot SX420 IS are ISO 100 to ISO 1600 (no boost).
Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.
| DXO |
|1.||Canon G7 X Mark III||1-inch||20.0||5472||3648||4K/30p||..||..||..||..|
|3.||Canon G5 X Mark II||1-inch||20.0||5472||3648||4K/30p||..||..||..||..|
|7.||Canon G7 X Mark II||1-inch||20.0||5472||3648||1080/60p||..||..||..||..|
|8.||Canon G5 X||1-inch||20.0||5472||3648||1080/60p||..||..||..||..|
|12.||Canon G7 X||1-inch||20.0||5472||3648||1080/60p||23.0||12.7||556||71|
|14.||Panasonic FZ1000 II||1-inch||20.0||5472||3648||4K/30p||..||..||..||..|
|17.||Sony RX100 VI||1-inch||20.0||5472||3648||4K/30p||..||..||..||..|
Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the G7X Mark III provides a higher video resolution than the SX420. It can shoot video footage at 4K/30p, while the SX420 is limited to 720/25p.
Apart from body and sensor, cameras can and do differ across a variety of features. The G7X Mark III and the SX420 are similar in the sense that neither of the two has a viewfinder. The images are, thus, framed using live view on the rear LCD. The table below summarizes some of the other core capabilities of the Canon G7 X Mark III and Canon SX420 in connection with corresponding information for a sample of similar cameras.
|1.||Canon G7 X Mark III||none||n||3.0||1040||tilting||Y||1/2000s||30||Y||Y|
|3.||Canon G5 X Mark II||2360||n||3.0||1040||tilting||Y||1/2000s||30||Y||Y|
|7.||Canon G7 X Mark II||none||n||3.0||1040||tilting||Y||1/2000s||8.0||Y||Y|
|8.||Canon G5 X||2360||n||3.0||1040||swivel||Y||1/2000s||5.9||Y||Y|
|12.||Canon G7 X||none||n||3.0||1040||tilting||Y||1/2000s||6.5||Y||Y|
|14.||Panasonic FZ1000 II||2360||n||3.0||1240||swivel||Y||1/4000s||12.0||Y||Y|
|17.||Sony RX100 VI||2359||n||3.0||1229||tilting||Y||1/2000s||24.0||Y||Y|
One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The G7X Mark III has a touchscreen, while the SX420 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.The G7X Mark III has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the SX420 does not have a selfie-screen.
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 G7X Mark III 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 Canon G7 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.
Both the G7X Mark III and the SX420 have zoom lenses built in. The G7X Mark III has a 24-100mm f/1.8-2.8 optic and the SX420 offers a 24-1008mm f/3.5-6.6 (focal lengths in full frame equivalent terms). Hence, the G7X Mark III and SX420 provide the same view at the wide-angle end, but the SX420 has more tele-photo reach at the long end. The G7X Mark III offers the faster maximum aperture.
Concerning the storage of imaging data, both the G7X Mark III and the SX420 write their files to SDXC cards. The G7X Mark III supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the SX420 cannot take advantage of Ultra High Speed SD 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 G7 X Mark III and Canon PowerShot SX420 IS and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
| WiFi |
| NFC |
|1.||Canon G7 X Mark III||-||stereo||mono||Y||-||micro||3.1||Y||-||Y|
|3.||Canon G5 X Mark II||-||stereo||mono||-||-||micro||3.1||Y||-||Y|
|7.||Canon G7 X Mark II||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
|8.||Canon G5 X||Y||stereo||mono||-||-||mini||2.0||Y||Y||-|
|12.||Canon G7 X||-||stereo||mono||-||-||micro||2.0||Y||Y||-|
|14.||Panasonic FZ1000 II||Y||stereo||mono||Y||-||micro||2.0||Y||-||Y|
|17.||Sony RX100 VI||-||stereo||mono||-||-||micro||2.0||Y||Y||Y|
It is notable that the G7X Mark III has a microphone port, which is missing on the SX420. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.
The G7X Mark III is a recent model that features in the current product line-up of Canon. In contrast, the SX420 has been discontinued (but can be found pre-owned on eBay). As a replacement in the same line of cameras, the SX420 was succeeded by the Canon SX430. 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 G7 X Mark III and the Canon SX420? Which camera is better? The listing below highlights the relative strengths of the two models.
Reasons to prefer the Canon PowerShot G7 X Mark III:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- Better image quality: Features a larger and more technologically advanced imaging sensor.
- Richer colors: The sensor size advantage translates into images with better, more accurate colors.
- More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
- Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
- Better jpgs: Has a more modern image processing engine (DIGIC 8 vs DIGIC 4+).
- Better video: Provides higher definition movie capture (4K/30p vs 720/25p).
- Better sound: Can connect to an external microphone for higher quality sound recording.
- More detailed LCD: Has a higher resolution rear screen (1040k vs 230k dots).
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- Faster burst: Shoots at higher frequency (30 vs 0.5 flaps/sec) to capture the decisive moment.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- Better light gathering: Has a lens with a wider maximum aperture (f/1.8 vs f/3.5).
- More compact: Is smaller (105x61mm vs 104x69mm) and thus needs less room in the bag.
- Longer lasting: Can take more shots (235 versus 195) on a single battery charge.
- Easier travel charging: Can be conveniently charged via its USB port.
- Faster data transfer: Supports a more advanced USB protocol (3.1 vs 2.0).
- Easier wireless transfer: Supports Bluetooth for image sharing without cables.
- Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
- More modern: Reflects 3 years and 6 months of technical progress since the SX420 launch.
Advantages of the Canon PowerShot SX420 IS:
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- Faster shutter: Has higher mechanical shutter speed (1/4000s vs 1/2000s) to freeze action.
- More tele-reach: Has a longer tele-lens for perspective compression and subject magnification.
- Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
- More affordable: Was introduced into a lower priced category (60 percent cheaper at launch).
- More heavily discounted: Has been around for much longer (launched in January 2016).
If the number of relative strengths (bullet points above) is taken as a guide, the G7X Mark III is the clear winner of the match-up (23 : 6 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 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 G7 X Mark III and the Canon SX420 place the cameras among the top in their class? Find out in the latest Best Travel-Zoom Camera and Best Superzoom Camera listings whether the two cameras rank among the cream of the crop.
In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the G7X Mark III or the SX420 perform in practice. 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 where reviews by experts come in. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], 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 G7 X Mark III||..||+ +||81/100||4/5||..||Jul 2019||749|
|2.||Canon SX420||..||..||..||..||3/5||Jan 2016||299|
|3.||Canon G5 X Mark II||4/5||+||82/100||..||4/5||Jul 2019||899|
|4.||Canon SX740||..||+||..||4/5||4/5||Jul 2018||399|
|5.||Canon SX430||..||..||..||3.5/5||3.5/5||Jan 2017||299|
|6.||Canon SX730||..||+||..||4/5||4/5||Apr 2017||399|
|7.||Canon G7 X Mark II||4.5/5||+ +||81/100||4.5/5||4.5/5||Feb 2016||699|
|8.||Canon G5 X||5/5||+ +||78/100||4.5/5||4.5/5||Oct 2015||799|
|9.||Canon SX410||..||o||..||..||..||Feb 2015||279|
|10.||Canon SX610||..||..||..||4/5||4/5||Jan 2015||249|
|11.||Canon SX710||..||+||..||4/5||3.5/5||Jan 2015||349|
|12.||Canon G7 X||4/5||+ +||77/100||4.5/5||4.5/5||Sep 2014||699|
|13.||Leica C-LUX||..||..||..||4.5/5||4/5||Jun 2018||1,049|
|14.||Panasonic FZ1000 II||..||..||83/100||4.5/5||4.5/5||Feb 2019||899|
|15.||Panasonic ZS200||..||+ +||81/100||4.5/5||4.5/5||Feb 2018||799|
|16.||Sony ZV-1||4/5||..||85/100||4/5||4.5/5||May 2020||799|
|17.||Sony RX100 VI||4.5/5||+ +||83/100||4/5||4.5/5||Jun 2018||1,199|
|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 G7 X Mark III vs Canon SX420
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 G7 X Mark III||Canon SX420|
|Camera Type||Fixed lens compact camera||Fixed lens compact camera|
|Camera Lens||24-100mm f/1.8-2.8||24-1008mm f/3.5-6.6|
|Launch Date||July 2019||January 2016|
|Launch Price||USD 749||USD 299|
|Sensor Specs||Canon G7 X Mark III||Canon SX420|
|Sensor Format||1" Sensor||1/2.3" Sensor|
|Sensor Size||13.2 x 8.8 mm||6.17 x 4.55 mm|
|Sensor Area||116.16 mm2||28.0735 mm2|
|Sensor Diagonal||15.9 mm||7.7 mm|
|Sensor Resolution||20 Megapixels||19.9 Megapixels|
|Image Resolution||5472 x 3648 pixels||5152 x 3864 pixels|
|Pixel Pitch||2.41 μm||1.19 μm|
|Pixel Density||17.18 MP/cm2||70.91 MP/cm2|
|Moiré control||Anti-Alias filter||no AA filter|
|Movie Capability||4K/30p Video||720/25p Video|
|ISO Setting||125 - 12,800 ISO||100 - 1,600 ISO|
|ISO Boost||125 - 25,600 ISO||no Enhancement|
|Image Processor||DIGIC 8||DIGIC 4+|
|Screen Specs||Canon G7 X Mark III||Canon SX420|
|Viewfinder Type||no viewfinder||no viewfinder|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||1040k dots||230k dots|
|LCD Attachment||Tilting screen||Fixed screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Canon G7 X Mark III||Canon SX420|
|Focus System||Contrast-detect AF||Contrast-detect AF|
|Manual Focusing Aid||Focus Peaking||no Peaking Feature|
|Continuous Shooting||30 shutter flaps/s||0.5 shutter flaps/s|
|Electronic Shutter||up to 1/25600s||no E-Shutter|
|Time-Lapse Photography||Intervalometer built-in||no 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||no|
|Connectivity Specs||Canon G7 X Mark III||Canon SX420|
|External Flash||no Hotshoe||no Hotshoe|
|USB Connector||USB 3.1||USB 2.0|
|HDMI Port||micro HDMI||no HDMI|
|Microphone Port||External MIC port||no MIC socket|
|Wifi Support||Wifi built-in||Wifi built-in|
|Near-Field Communication||no NFC||NFC built-in|
|Bluetooth Support||Bluetooth built-in||no Bluetooth|
|Body Specs||Canon G7 X Mark III||Canon SX420|
|Battery Life (CIPA)||235 shots per charge||195 shots per charge|
|In-Camera Charging||USB charging||no USB charging|
105 x 61 x 41 mm
(4.1 x 2.4 x 1.6 in)
104 x 69 x 85 mm
(4.1 x 2.7 x 3.3 in)
|Camera Weight||304 g (10.7 oz)||325 g (11.5 oz)|
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