Fujifilm X-A3 vs Pentax K-70
The Fujifilm X-A3 and the Pentax K-70 are two digital cameras that were officially introduced, respectively, in August 2016 and June 2016. The X-A3 is a mirrorless interchangeable lens camera, while the K-70 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.
Going beyond this snapshot of core features and characteristics, what are the differences between the Fujifilm X-A3 and the Pentax K-70? 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 physical size and weight of the Fujifilm X-A3 and the Pentax K-70 are illustrated in the side-by-side display below. 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 X-A3 can be obtained in three different colors (silver, brown, pink), while the K-70 is available in two color-versions (black, silver).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-70 is considerably larger (49 percent) than the Fujifilm X-A3. Moreover, the K-70 is substantially heavier (103 percent) than the X-A3. It is noteworthy in this context that the K-70 is splash and dust-proof, while the X-A3 does not feature any corresponding weather-sealing.
The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.
The power pack in the X-A3 can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.
The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.
|1.||Fujifilm X-A3||117 mm||67 mm||40 mm||339 g||410||n||Aug 2016||399||ebay.com|
|2.||Pentax K-70||126 mm||93 mm||74 mm||688 g||410||Y||Jun 2016||649||amazon.com|
|3.||Fujifilm X-T200||121 mm||84 mm||55 mm||370 g||270||n||Jan 2020||699||amazon.com|
|4.||Fujifilm X-T30||118 mm||83 mm||47 mm||383 g||380||n||Feb 2019||899||ebay.com|
|5.||Fujifilm X-A7||119 mm||68 mm||41 mm||320 g||440||n||Sep 2019||499||amazon.com|
|6.||Fujifilm X-A5||117 mm||68 mm||40 mm||361 g||450||n||Jan 2018||399||ebay.com|
|7.||Fujifilm X-E3||121 mm||74 mm||43 mm||337 g||350||n||Sep 2017||899||ebay.com|
|8.||Fujifilm X-T20||118 mm||83 mm||41 mm||383 g||350||n||Jan 2017||899||ebay.com|
|9.||Fujifilm X-A10||117 mm||67 mm||40 mm||331 g||410||n||Dec 2016||399||ebay.com|
|10.||Fujifilm X-A2||117 mm||67 mm||40 mm||350 g||410||n||Jan 2015||399||ebay.com|
|11.||Fujifilm X-T10||118 mm||83 mm||41 mm||381 g||350||n||May 2015||799||ebay.com|
|12.||Fujifilm X-A1||117 mm||67 mm||39 mm||330 g||350||n||Sep 2013||399||ebay.com|
|13.||Pentax K-3 III||135 mm||104 mm||74 mm||820 g||800||Y||Mar 2021||1,999||amazon.com|
|14.||Pentax KP||132 mm||101 mm||76 mm||703 g||390||Y||Jan 2017||1,099||ebay.com|
|15.||Pentax K-S2||123 mm||91 mm||73 mm||678 g||410||Y||Feb 2015||749||ebay.com|
|16.||Pentax K-3 II||131 mm||100 mm||77 mm||800 g||720||Y||Apr 2015||1,099||ebay.com|
|17.||Pentax K-50||130 mm||97 mm||71 mm||650 g||410||Y||Jun 2013||599||ebay.com|
|Note: 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 X-A3 was launched at a markedly lower price (by 39 percent) than the K-70, which puts it into a different market segment. 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 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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.
Both cameras under consideration feature an APS-C sensor, but their sensors differ slightly in size. The sensor area in the K-70 is 1 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.
Even though the X-A3 has a slightly larger sensor, both cameras offer the same resolution of 24 megapixels. This implies that the X-A3 has a lower pixel density and larger individual pixels (with a pixel pitch of 3.92μm versus 3.91μm for the K-70), which gives it a potential advantage in terms of light gathering capacity. The two cameras were released in close succession, so that their sensors are from the same technological generation. Coming back to sensor resolution, it should be mentioned that the K-70 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
The K-70 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
Unlike the X-A3, the K-70 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).
The Fujifilm X-A3 has a native sensitivity range from ISO 200 to ISO 6400, which can be extended to ISO 100-25600. The corresponding ISO settings for the Pentax K-70 are ISO 100 to ISO 102400 (no boost).
Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.
Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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 following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.
|13.||Pentax K-3 III||APS-C||25.6||6192||4128||4K/30p||24.2||13.7||2083||85|
|16.||Pentax K-3 II||APS-C||24.1||6016||4000||1080/60i||23.6||13.6||1106||80|
|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 two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the X-A3 provides a higher frame rate than the K-70. It can shoot video footage at 1080/60p, while the Pentax is limited to 1080/60i.
Beyond body and sensor, cameras can and do differ across a range of features. For example, the K-70 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the X-A3 relies on live view and the rear LCD for framing. The following table reports on some other key feature differences and similarities of the Fujifilm X-A3, the Pentax K-70, and comparable cameras.
|1.||Fujifilm X-A3||none||n||3.0 / 1040||tilting||Y||1/4000s||6.0/s||Y||n|
|2.||Pentax K-70||optical||n||3.0 / 921||swivel||n||1/6000s||6.0/s||Y||Y|
|3.||Fujifilm X-T200||2360||n||3.5 / 2780||swivel||Y||1/4000s||8.0/s||Y||n|
|4.||Fujifilm X-T30||2360||n||3.0 / 1040||tilting||Y||1/4000s||8.0/s||Y||n|
|5.||Fujifilm X-A7||none||n||3.5 / 2760||swivel||Y||1/4000s||6.0/s||Y||n|
|6.||Fujifilm X-A5||none||n||3.0 / 1040||tilting||Y||1/4000s||6.0/s||Y||n|
|7.||Fujifilm X-E3||2360||n||3.0 / 1040||fixed||Y||1/4000s||8.0/s||n||n|
|8.||Fujifilm X-T20||2360||n||3.0 / 1040||tilting||Y||1/4000s||8.0/s||Y||n|
|9.||Fujifilm X-A10||none||n||3.0 / 1040||tilting||n||1/4000s||6.0/s||Y||n|
|10.||Fujifilm X-A2||none||n||3.0 / 920||tilting||n||1/4000s||5.6/s||Y||n|
|11.||Fujifilm X-T10||2360||n||3.0 / 920||tilting||n||1/4000s||8.0/s||Y||n|
|12.||Fujifilm X-A1||none||n||3.0 / 920||tilting||n||1/4000s||5.6/s||Y||n|
|13.||Pentax K-3 III||optical||Y||3.2 / 1620||fixed||Y||1/8000s||12.0/s||n||Y|
|14.||Pentax KP||optical||n||3.0 / 921||tilting||n||1/6000s||7.0/s||Y||Y|
|15.||Pentax K-S2||optical||n||3.0 / 921||swivel||n||1/6000s||5.4/s||Y||Y|
|16.||Pentax K-3 II||optical||Y||3.2 / 1037||fixed||n||1/8000s||8.3/s||n||Y|
|17.||Pentax K-50||optical||n||3.0 / 921||fixed||n||1/6000s||6.0/s||Y||Y|
|Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.|
One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The X-A3 has a touchscreen, while the K-70 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.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 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 X-A3 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 Fujifilm X-A3 and the Pentax K-70 both have 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 X-A3 and the K-70 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.
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 Fujifilm X-A3 and Pentax K-70 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Mic / Speaker
|1.||Fujifilm X-A3||Y||stereo / mono||-||-||micro||2.0||Y||-||-|
|2.||Pentax K-70||Y||stereo / mono||Y||-||mini||2.0||Y||-||-|
|3.||Fujifilm X-T200||Y||stereo / mono||Y||Y||micro||3.1||Y||-||Y|
|4.||Fujifilm X-T30||Y||stereo / mono||Y||-||micro||3.1||Y||-||Y|
|5.||Fujifilm X-A7||Y||stereo / mono||Y||-||micro||2.0||Y||-||Y|
|6.||Fujifilm X-A5||Y||stereo / mono||Y||-||micro||2.0||Y||-||Y|
|7.||Fujifilm X-E3||Y||stereo / mono||Y||-||micro||2.0||Y||-||Y|
|8.||Fujifilm X-T20||Y||stereo / mono||Y||-||micro||2.0||Y||-||-|
|9.||Fujifilm X-A10||-||stereo / mono||-||-||micro||2.0||Y||-||-|
|10.||Fujifilm X-A2||Y||stereo / mono||-||-||mini||2.0||Y||-||-|
|11.||Fujifilm X-T10||Y||stereo / mono||Y||-||micro||2.0||Y||-||-|
|12.||Fujifilm X-A1||Y||stereo / mono||-||-||mini||2.0||Y||-||-|
|13.||Pentax K-3 III||Y||stereo / mono||Y||Y||micro||3.2||Y||-||Y|
|14.||Pentax KP||Y||stereo / mono||Y||-||-||2.0||Y||-||-|
|15.||Pentax K-S2||Y||mono / mono||Y||-||micro||2.0||Y||Y||-|
|16.||Pentax K-3 II||Y||mono / mono||Y||Y||mini||3.0||-||-||-|
|17.||Pentax K-50||Y||mono / mono||-||-||micro||2.0||-||-||-|
It is notable that the K-70 has a microphone port, which can help to improve the quality of audio recordings by attaching an external microphone. The X-A3 does not feature such a mic input.
The K-70 is a recent model that features in the current product line-up of Pentax. In contrast, the X-A3 has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the X-A3 was succeeded by the Fujifilm X-A5. Further information on the features and operation of the X-A3 and K-70 can be found, respectively, in the Fujifilm X-A3 Manual (free pdf) or the online Pentax K-70 Manual.
So what is the bottom line? Is the Fujifilm X-A3 better than the Pentax K-70 or vice versa? The listing below highlights the relative strengths of the two models.
Arguments in favor of the Fujifilm X-A3:
- 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 detailed LCD: Has a higher resolution rear screen (1040k vs 921k dots).
- Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
- Less disturbing: Has an electronic shutter option for completely silent shooting.
- More compact: Is smaller (117x67mm vs 126x93mm) and thus needs less room in the bag.
- Less heavy: Is lighter (by 349g or 51 percent) and hence easier to carry around.
- Easier travel charging: Can be conveniently charged via its USB port.
- More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
- More affordable: Was introduced into a lower priced category (39 percent cheaper at launch).
Reasons to prefer the Pentax K-70:
- 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.
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- Better sound: Can connect to an external microphone for higher quality sound recording.
- Easier framing: Has an optical viewfinder for image composition and settings control.
- More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
- Faster shutter: Has higher mechanical shutter speed (1/6000s vs 1/4000s) to freeze action.
- Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
- Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
If the count of individual advantages (bullet points above) is taken as a guide, the X-A3 comes out slightly ahead of the K-70 (10 : 9 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 Fujifilm X-A3 and the Pentax K-70 place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR 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 says little about, for example, the shooting experience and imaging performance of the X-A3 and the K-70 in practical situations. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.
This is why hands-on reviews by experts are important. The following table reports the overall ratings of the cameras as published by some of the major camera 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.||Fujifilm X-A3||..||..||..||74/100||4.5/5||4/5||Aug 2016||399||ebay.com|
|2.||Pentax K-70||4.5/5||..||4/5||79/100||4.5/5||4.5/5||Jun 2016||649||amazon.com|
|3.||Fujifilm X-T200||3.5/5||..||4/5||82/100||4/5||4.5/5||Jan 2020||699||amazon.com|
|4.||Fujifilm X-T30||5/5||+ +||5/5||84/100||4.5/5||4.5/5||Feb 2019||899||ebay.com|
|5.||Fujifilm X-A7||3/5||..||3.5/5||81/100||4/5||3.5/5||Sep 2019||499||amazon.com|
|6.||Fujifilm X-A5||..||+||4.1/5||..||4/5||3.5/5||Jan 2018||399||ebay.com|
|7.||Fujifilm X-E3||4.5/5||+||4.5/5||84/100||4.5/5||4.5/5||Sep 2017||899||ebay.com|
|8.||Fujifilm X-T20||5/5||+ +||5/5||82/100||5/5||4.5/5||Jan 2017||899||ebay.com|
|9.||Fujifilm X-A10||..||..||..||..||4/5||4/5||Dec 2016||399||ebay.com|
|10.||Fujifilm X-A2||4/5||..||..||..||4.5/5||4.5/5||Jan 2015||399||ebay.com|
|11.||Fujifilm X-T10||4.5/5||+ +||..||80/100||5/5||5/5||May 2015||799||ebay.com|
|12.||Fujifilm X-A1||..||..||..||..||4.5/5||4.5/5||Sep 2013||399||ebay.com|
|13.||Pentax K-3 III||4/5||..||3/5||..||4.5/5||..||Mar 2021||1,999||amazon.com|
|14.||Pentax KP||4/5||..||3/5||82/100||5/5||4.5/5||Jan 2017||1,099||ebay.com|
|15.||Pentax K-S2||4.5/5||..||..||..||5/5||4.5/5||Feb 2015||749||ebay.com|
|16.||Pentax K-3 II||4.5/5||..||..||..||5/5||5/5||Apr 2015||1,099||ebay.com|
|17.||Pentax K-50||5/5||..||..||..||5/5||4.5/5||Jun 2013||599||ebay.com|
|Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.|
The above review scores should be interpreted with care, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Thus, a score needs to be put into the context of the launch date and the launch price 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 are interested in seeing how other cameras pair up, just make your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.
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- Fujifilm X-A3 vs Olympus E-1
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- Fujifilm X-A3 vs Sony NEX-F3
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Specifications: Fujifilm X-A3 vs Pentax K-70
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||Fujifilm X-A3||Pentax K-70|
|Camera Type||Mirrorless system camera||Digital single lens reflex|
|Camera Lens||Fujifilm X mount lenses||Pentax K mount lenses|
|Launch Date||August 2016||June 2016|
|Launch Price||USD 399||USD 649|
|Sensor Specs||Fujifilm X-A3||Pentax K-70|
|Sensor Format||APS-C Sensor||APS-C Sensor|
|Sensor Size||23.5 x 15.7 mm||23.5 x 15.6 mm|
|Sensor Area||368.95 mm2||366.6 mm2|
|Sensor Diagonal||28.3 mm||28.2 mm|
|Sensor Resolution||24 Megapixels||24 Megapixels|
|Image Resolution||6000 x 4000 pixels||6000 x 4000 pixels|
|Pixel Pitch||3.92 μm||3.91 μm|
|Pixel Density||6.50 MP/cm2||6.55 MP/cm2|
|Moiré control||Anti-Alias filter||no AA filter|
|Movie Capability||1080/60p Video||1080/60i Video|
|ISO Setting||200 - 6,400 ISO||100 - 102,400 ISO|
|ISO Boost||100 - 25,600 ISO||no Enhancement|
|Screen Specs||Fujifilm X-A3||Pentax K-70|
|Viewfinder Type||no viewfinder||Optical viewfinder|
|Viewfinder Field of View||100%|
|LCD Framing||Live View||Live View|
|Rear LCD Size||3.0inch||3.0inch|
|LCD Resolution||1040k dots||921k dots|
|LCD Attachment||Tilting screen||Swivel screen|
|Touch Input||Touchscreen||no Touchscreen|
|Shooting Specs||Fujifilm X-A3||Pentax K-70|
|Focus System||Contrast-detect AF||Phase-detect AF|
|Manual Focusing Aid||Focus Peaking||Focus Peaking|
|Max Shutter Speed (mechanical)||1/4000s||1/6000s|
|Continuous Shooting||6 shutter flaps/s||6 shutter flaps/s|
|Electronic Shutter||up to 1/32000s||no E-Shutter|
|Time-Lapse Photography||Intervalometer built-in||Intervalometer built-in|
|Image Stabilization||Lens stabilization only||In-body stabilization|
|Fill Flash||Built-in Flash||Built-in Flash|
|Storage Medium||SDXC cards||SDXC cards|
|Single or Dual Card Slots||Single card slot||Single card slot|
|UHS card support||UHS-I||UHS-I|
|Connectivity Specs||Fujifilm X-A3||Pentax K-70|
|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|
|Body Specs||Fujifilm X-A3||Pentax K-70|
|Environmental Sealing||not weather sealed||Weathersealed body|
|Battery Life (CIPA)||410 shots per charge||410 shots per charge|
|In-Camera Charging||USB charging||no USB charging|
117 x 67 x 40 mm
(4.6 x 2.6 x 1.6 in)
126 x 93 x 74 mm
(5.0 x 3.7 x 2.9 in)
|Camera Weight||339 g (12.0 oz)||688 g (24.3 oz)|
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