Pentax K-3 II versus Canon G1 X Mark III
The Pentax K-3 II and the Canon PowerShot G1 X Mark III are two enthusiast cameras that were announced, respectively, in April 2015 and October 2017. The K-3 II is a DSLR, while the G1X Mark III is a fixed lens compact. Both cameras are equipped with an APS-C sensor. The Pentax has a resolution of 24.1 megapixel, whereas the Canon provides 24 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.
Body comparison: Pentax K-3 II vs Canon G1 X Mark III
The side-by-side display below illustrates the physical size and weight of the Pentax K-3 II and the Canon G1 X Mark III. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter. If you prefer, you can also use the toggle button to switch to a comparison in percentage terms (in this case, the camera on the left – the K-3 II – represents 100 percent across all the size and weight measures).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon G1 X Mark III is considerably smaller (32 percent) than the Pentax K-3 II. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
The above size and weight comparisons are to some extent incomplete and possibly misleading, as the G1X Mark III has a lens build in, whereas the K-3 II is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you want to switch the focus of the display and review another camera pair, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.
|Camera Body Specifications|
|Pentax K-3 II»||5.2 in||3.9 in||3.0 in||28.2 oz||720||Y||Apr 2015||1,099|
|Canon G1 X Mark III«||4.5 in||3.1 in||2.0 in||14.1 oz||200||Y||Oct 2017||1,299|
|Canon 6D Mark II« »||5.7 in||4.4 in||3.0 in||27.0 oz||1200||Y||Jun 2017||1,999|
|Canon 80D« »||5.5 in||4.1 in||3.1 in||25.8 oz||960||Y||Feb 2016||1,199|
|Canon 1D X Mark II« »||6.2 in||6.6 in||3.3 in||54.0 oz||1210||Y||Feb 2016||5,999|
|Nikon D7500« »||5.4 in||4.1 in||2.9 in||25.4 oz||950||Y||Apr 2017||1,299|
|Nikon D7200« »||5.4 in||4.2 in||3.0 in||27.0 oz||1110||Y||Mar 2015||1,199||-|
|Olympus E-M1 II« »||5.3 in||3.6 in||2.6 in||20.2 oz||440||Y||Sep 2016||1,999|
|Olympus E-M5 II« »||4.9 in||3.3 in||1.8 in||16.5 oz||310||Y||Feb 2015||1,099|
|Panasonic GX8« »||5.2 in||3.1 in||2.5 in||17.2 oz||330||Y||Jul 2015||1,199||-|
|Pentax KP« »||5.2 in||4.0 in||3.0 in||24.8 oz||390||Y||Jan 2017||1,099|
|Pentax K-70« »||5.0 in||3.7 in||2.9 in||24.3 oz||410||Y||Jun 2016||649|
|Pentax K-3« »||5.2 in||3.9 in||3.0 in||28.2 oz||560||Y||Oct 2013||1,299||-|
|Pentax K-5« »||5.2 in||3.8 in||2.9 in||26.8 oz||740||Y||Sep 2010||1,099||-|
|Sony RX10 III« »||5.2 in||3.7 in||5.0 in||37.1 oz||420||Y||Mar 2016||1,499||-|
|Sony RX10 II« »||5.1 in||3.5 in||4.0 in||28.7 oz||400||Y||Jun 2015||1,299||-|
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. 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: Pentax K-3 II vs Canon G1 X Mark III
The size of the imaging sensor is a crucial determinant 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. 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 associated with larger, more expensive camera bodies and lenses.
Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the G1X Mark III is 10 percent smaller. They nevertheless have the same format factor of 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
With 24.1MP, the K-3 II offers a slightly higher resolution than the G1X Mark III (24MP), but the K-3 II nevertheless has larger individual pixels (pixel pitch of 3.90μm versus 3.72μm for the G1X Mark III) due to its larger sensor. However, the G1X Mark III is a somewhat more recent model (by 2 years and 5 months) than the K-3 II, and its sensor might 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 K-3 II has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
Unlike the G1X Mark III, the K-3 II has the capacity to capture high quality composite images by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).
For most 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"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Pentax K-3 II»||APS-C||24.1||6016||4000||1080/60i||23.6||13.6||1106||80|
|Canon G1 X Mark III«||APS-C||24.0||6000||4000||1080/60p||-||-||-||-|
|Canon 6D Mark II« »||Full Frame||26.0||6240||4160||1080/60p||24.4||11.9||2862||85|
|Canon 80D« »||APS-C||24.0||6000||4000||1080/60p||23.6||13.2||1135||79|
|Canon 1D X Mark II« »||Full Frame||20.0||5472||3648||4K/60p||24.1||13.5||3207||88|
|Nikon D7500« »||APS-C||20.7||5568||3712||4K/30p||24.3||14.0||1483||86|
|Nikon D7200« »||APS-C||24.0||6000||4000||1080/60p||24.5||14.6||1333||87|
|Olympus E-M1 II« »||Four Thirds||20.2||5184||3888||4K/30p||23.7||12.8||1312||80|
|Olympus E-M5 II« »||Four Thirds||15.9||4608||3456||1080/60p||23.0||12.5||842||73|
|Panasonic GX8« »||Four Thirds||20.2||5184||3888||4K/30p||23.5||12.6||806||75|
|Pentax KP« »||APS-C||24.1||6016||4000||1080/60i||-||-||-||-|
|Pentax K-70« »||APS-C||24.0||6000||4000||1080/60i||-||-||-||-|
|Pentax K-3« »||APS-C||24.1||6016||4000||1080/60i||23.7||13.4||1216||80|
|Pentax K-5« »||APS-C||16.1||4928||3264||1080/25p||23.7||14.1||1162||82|
|Sony RX10 III« »||1-inch||20.0||5472||3648||4K/30p||23.1||12.6||472||70|
|Sony RX10 II« »||1-inch||20.0||5472||3648||4K/30p||23.0||12.6||531||70|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the G1X Mark III provides a faster frame rate than the K-3 II. It can shoot movie footage at 1080/60p, while the Pentax is limited to 1080/60i.
Feature comparison: Pentax K-3 II vs Canon G1 X Mark III
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 K-3 II 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 Pentax K-3 II and Canon G1 X Mark III in connection with corresponding information for a sample of similar cameras. If you need more detail on the specs, you can find comprehensive listings, for example, in the dpreview camera hub.
|Pentax K-3 II»||optical||Y||3.2||1037||fixed||n||8000||8.3||n||Y|
|Canon G1 X Mark III«||2360||n||3.0||1040||swivel||Y||2000||9.0||Y||Y|
|Canon 6D Mark II« »||optical||Y||3.0||1040||swivel||Y||4000||6.5||n||n|
|Canon 80D« »||optical||Y||3.0||1040||swivel||Y||8000||7.0||Y||n|
|Canon 1D X Mark II« »||optical||Y||3.2||1620||fixed||Y||8000||16.0||n||n|
|Nikon D7500« »||optical||Y||3.2||922||tilting||Y||8000||8.0||Y||n|
|Nikon D7200« »||optical||Y||3.2||1229||fixed||n||8000||6.0||Y||n|
|Olympus E-M1 II« »||2360||n||3.0||1037||swivel||Y||8000||18.0||n||Y|
|Olympus E-M5 II« »||2360||n||3.0||1037||swivel||Y||8000||10.0||n||Y|
|Panasonic GX8« »||2360||n||3.0||1040||swivel||Y||8000||10.0||n||Y|
|Pentax KP« »||optical||n||3.0||921||tilting||n||6000||7.0||Y||Y|
|Pentax K-70« »||optical||n||3.0||921||swivel||n||6000||6.0||Y||Y|
|Pentax K-3« »||optical||Y||3.2||1037||fixed||n||8000||8.3||Y||Y|
|Pentax K-5« »||optical||Y||3.0||921||fixed||n||8000||7.0||Y||Y|
|Sony RX10 III« »||2359||Y||3.0||1229||tilting||n||2000||14.0||Y||Y|
|Sony RX10 II« »||2359||Y||3.0||1229||tilting||n||3200||14.0||Y||Y|
Both the K-3 II and the G1X Mark III are current models that good online retailers will have in stock. You can check the latest prices, for example, at amazon. The K-3 II replaced the earlier Pentax K-3, while the G1X Mark III followed on from the Canon G1 X Mark II.
Review summary: Pentax K-3 II vs Canon G1 X Mark III
So how do things add up? Is there a clear favorite between the Pentax K-3 II and the Canon G1 X Mark III? Below is a summary of the relative strengths of each of the two contestants.
Reasons to prefer the Pentax K-3 II:
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- High quality composites: Can combine several shots after pixel-shifting its sensor.
- Brighter framing: Features an optical viewfinder for clear, lag-free composition.
- Easier setting verification: Has an LCD display on top to control shooting parameters.
- Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
- Faster shutter: Has higher mechanical shutter speed (8000/sec vs 2000/sec) to freeze action.
- More flexible: Can take a variety of interchangeable lenses, including specialty optics.
- Longer lasting: Can take more shots (720 versus 200) on a single battery charge.
- More heavily discounted: Has been available for much longer (launched in April 2015).
Advantages of the Canon PowerShot G1 X Mark III:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
- More framing info: Has an electronic viewfinder that displays shooting data.
- More flexible LCD: Has swivel screen for odd-angle shots in portrait or landscape orientation.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Ready to shoot: Comes with an integrated lens, while the K-3 II requires a separate lens.
- More compact: Is smaller (115x78mm vs 131x100mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight even though it has a lens build in (unlike the K-3 II).
- Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
- More modern: Reflects 2 years and 5 months of technical progress since the K-3 II launch.
If the count of relative strengths (bullet points above) is taken as a measure, the G1X Mark III comes out slightly ahead of the K-3 II (10 : 9 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.
In any case, while the specs-based evaluation of cameras is instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the K-3 II or the G1X Mark III. 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 adjacent table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The full reviews are available by clicking on the site logo in the table header.
|Pentax K-3 II»||-||-||5/5||4.5/5||5/5||Apr 2015||1,099|
|Canon G1 X Mark III«||Rec||79/100||4.5/5||-||4.5/5||Oct 2017||1,299|
|Canon 6D Mark II« »||Rec||80/100||4.5/5||4/5||4/5||Jun 2017||1,999|
|Canon 80D« »||HiRec||84/100||4.5/5||4.5/5||4.5/5||Feb 2016||1,199|
|Canon 1D X Mark II« »||-||89/100||4.5/5||5/5||4.5/5||Feb 2016||5,999|
|Nikon D7500« »||HiRec||86/100||5/5||4.5/5||4.5/5||Apr 2017||1,299|
|Nikon D7200« »||HiRec||84/100||4.5/5||4/5||4.5/5||Mar 2015||1,199||-|
|Olympus E-M1 II« »||HiRec||85/100||4.5/5||5/5||4.5/5||Sep 2016||1,999|
|Olympus E-M5 II« »||HiRec||81/100||5/5||4.5/5||5/5||Feb 2015||1,099|
|Panasonic GX8« »||Rec||82/100||4.5/5||5/5||4.5/5||Jul 2015||1,199||-|
|Pentax KP« »||-||82/100||5/5||-||4.5/5||Jan 2017||1,099|
|Pentax K-70« »||-||79/100||4.5/5||4/5||4.5/5||Jun 2016||649|
|Pentax K-3« »||-||83/100||5/5||4.5/5||5/5||Oct 2013||1,299||-|
|Pentax K-5« »||-||83/100||5/5||4.5/5||4.5/5||Sep 2010||1,099||-|
|Sony RX10 III« »||Rec||84/100||4.5/5||4.5/5||4.5/5||Mar 2016||1,499||-|
|Sony RX10 II« »||HiRec||82/100||4.5/5||4.5/5||4/5||Jun 2015||1,299||-|
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 rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.
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