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Sony A58 versus Pentax K-70

The Sony Alpha SLT-A58 and the Pentax K-70 are two digital cameras that were revealed to the public, respectively, in February 2013 and June 2016. Both are DSLR (Digital Single Lens Reflex) cameras that are equipped with an APS-C sensor. The Sony has a resolution of 19.8 megapixel, whereas the Pentax 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: Sony A58 vs Pentax K-70

The physical size and weight of the Sony A58 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 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 Sony A58 – represents 100 percent across all the size and weight measures).

Compare Sony A58 vs Pentax K-70
Compare Sony A58 versus K-70 top
Compare Sony A58 and K-70 rear

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 somewhat smaller (4 percent) than the Sony A58. However, the K-70 is substantially heavier (40 percent) than the Sony A58. It is noteworthy in this context that the K-70 is splash and dust-proof, while the Sony A58 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 the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the Sony A58 gets 690 shots out of its NP-FM500H battery, while the K-70 can take 410 images on a single charge of its D-LI109 power pack.

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, 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
  Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(yes/no)
Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
Sony A58» 129 mm 95 mm 78 mm 492 g 690 n Feb 2013 599- i Sony A58
Pentax K-70« 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 649 i i Pentax K-70
Canon G7 X« » 103 mm 60 mm 40 mm 304 g 210 n Sep 2014 699- i Canon G7 X
Canon 100D« » 117 mm 91 mm 69 mm 407 g 380 n Mar 2013 549- i Canon 100D
Canon 700D« » 133 mm 100 mm 79 mm 580 g 440 n Mar 2013 649- i Canon 700D
Nikon D3300« » 124 mm 98 mm 76 mm 430 g 700 n Jan 2014 499- i Nikon D3300
Nikon D3200« » 125 mm 96 mm 77 mm 505 g 540 n Apr 2012 599- i Nikon D3200
Olympus E-M1 II« » 134 mm 91 mm 67 mm 574 g 440 Y Sep 2016 1,999 i i Olympus E-M1 II
Panasonic GH5« » 139 mm 98 mm 87 mm 725 g 410 Y Jan 2017 1,999 i i Panasonic GH5
Pentax KP« » 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 1,099 i i Pentax KP
Pentax K-3 II« » 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099 i i Pentax K-3 II
Pentax K-3« » 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299- i Pentax K-3
Sony A7 II« » 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999- i Sony A7 II
Sony A5100« » 110 mm 63 mm 36 mm 283 g 400 n Aug 2014 549 i i Sony A5100
Sony A6000« » 120 mm 67 mm 45 mm 344 g 360 n Feb 2014 599- i Sony A6000
Sony A3000« » 128 mm 91 mm 85 mm 411 g 470 n Aug 2013 329- i Sony A3000
Sony RX100« » 102 mm 58 mm 36 mm 240 g 330 n Jun 2012 649- i Sony RX100

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. The Sony A58 was somewhat cheaper (by 8 percent) than the K-70 at launch, but both cameras fall into the same price category. 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: Sony A58 vs Pentax K-70

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and 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 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.

Sony A58 and Pentax K-70 sensor measures

While the two cameras under review share the same sensor size, the K-70 offers a higher resolution of 24 megapixel, compared with 19.8 MP of the Sony A58. This megapixel advantage translates into a 10 percent gain in linear resolution. On the other hand, these sensor specs imply that the K-70 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.91μm versus 4.31μm for the Sony A58). However, it should be noted that the K-70 is much more recent (by 3 years and 3 months) than the Sony A58, and its sensor will have benefitted from technological advances during this time that compensate for the smaller pixel size. 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 relatively fast and reliable autofocus acquisition during video recording.

Unlike the Sony A58, 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).

Sony A58 versus K-70 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 table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

Sensor Characteristics
  Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Camera
Model
Sony A58» APS-C 19.8 5456 36321080/60i23.312.575374Sony A58
Pentax K-70« APS-C 24.0 6000 40001080/60i----Pentax K-70
Canon G7 X« » 1-inch 20.0 5472 36481080/60p23.012.755671Canon G7 X
Canon 100D« » APS-C 17.9 5184 34561080/30p21.811.384363Canon 100D
Canon 700D« » APS-C 17.9 5184 34561080/30p21.711.268161Canon 700D
Nikon D3300« » APS-C 24.0 6000 40001080/60p24.312.8138582Nikon D3300
Nikon D3200« » APS-C 24.1 6016 40001080/30p24.113.2113181Nikon D3200
Olympus E-M1 II« » Four Thirds 20.2 5184 38884K/30p23.712.8131280Olympus E-M1 II
Panasonic GH5« » Four Thirds 20.2 5184 38884K/60p23.913.080777Panasonic GH5
Pentax KP« » APS-C 24.1 6016 40001080/60i----Pentax KP
Pentax K-3 II« » APS-C 24.1 6016 40001080/60i23.613.6110680Pentax K-3 II
Pentax K-3« » APS-C 24.1 6016 40001080/60i23.713.4121680Pentax K-3
Sony A7 II« » Full Frame 24.0 6000 40001080/60p24.913.6244990Sony A7 II
Sony A5100« » APS-C 24.0 6000 40001080/60p23.812.7134780Sony A5100
Sony A6000« » APS-C 24.0 6000 40001080/60p24.113.1134782Sony A6000
Sony A3000« » APS-C 19.8 5456 36321080/60i23.712.8106878Sony A3000
Sony RX100« » 1-inch 20.0 5472 36481080/60p22.612.439066Sony RX100

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, and both provide the same movie specifications (1080/60i).

 

Feature comparison: Sony A58 vs Pentax K-70

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the Sony A58 has an electronic viewfinder (1440k dots), while the K-70 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 adjacent table lists some of the other core features of the Sony A58 and Pentax K-70 along with similar information for a selection of comparators. If you need more detail on the specs, you can find comprehensive listings, for example, in the dpreview camera hub.

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)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec)
Build-in
Flash
(yes/no)
Build-in
Image
Stab
Camera
Model
Sony A58»1440 n 2.7 460 tilting n 4000 5.0 Y Y Sony A58
Pentax K-70«optical n 3.0 921 swivel n 6000 6.0 Y Y Pentax K-70
Canon G7 X« »- n 3.0 1040 tilting Y 2000 6.5 Y Y Canon G7 X
Canon 100D« »optical n 3.0 1040 fixed Y 4000 4.9 Y n Canon 100D
Canon 700D« »optical n 3.0 1040 swivel Y 4000 5.0 Y n Canon 700D
Nikon D3300« »optical n 3.0 921 fixed n 4000 5.0 Y n Nikon D3300
Nikon D3200« »optical n 3.0 921 fixed n 4000 4.0 Y n Nikon D3200
Olympus E-M1 II« »2360 n 3.0 1037 swivel Y 8000 18.0 n Y Olympus E-M1 II
Panasonic GH5« »3680 n 3.2 1620 swivel Y 8000 12.0 n Y Panasonic GH5
Pentax KP« »optical n 3.0 921 tilting n 6000 7.0 Y Y Pentax KP
Pentax K-3 II« »optical Y 3.2 1037 fixed n 8000 8.3 n Y Pentax K-3 II
Pentax K-3« »optical Y 3.2 1037 fixed n 8000 8.3 Y Y Pentax K-3
Sony A7 II« »2400 n 3.0 1230 tilting n 8000 5.0 n Y Sony A7 II
Sony A5100« »- n 3.0 922 tilting Y 4000 6.0 Y n Sony A5100
Sony A6000« »1440 n 3.0 922 tilting n 4000 11.0 Y n Sony A6000
Sony A3000« »202 n 3.0 230 fixed n 4000 2.5 Y n Sony A3000
Sony RX100« »- n 3.0 1229 fixed n 2000 10.0 Y Y Sony RX100

The Sony A58 writes its imaging data to SDXC or Memory Stick PRO Duo cards, while the K-70 uses SDXC cards.

Input-Output Connections
  Camera
Model
Hotshoe
Port
Internal
Microphone
Internal
Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Type
WiFi
Support
NFC
Support
Bluetooth
Support
Camera
Model
Sony A58»YstereomonoY-mini2.0---Sony A58
Pentax K-70«YstereomonoY-mini2.0Y--Pentax K-70
Canon G7 X« »-stereomono--micro2.0YY-Canon G7 X
Canon 100D« »YmonomonoY-mini2.0---Canon 100D
Canon 700D« »YstereomonoY-mini2.0---Canon 700D
Nikon D3300« »YmonomonoY-mini2.0---Nikon D3300
Nikon D3200« »YmonomonoY-mini2.0---Nikon D3200
Olympus E-M1 II« »YstereomonoYYmicro3.0Y--Olympus E-M1 II
Panasonic GH5« »YstereomonoYYfull3.1Y-YPanasonic GH5
Pentax KP« »YstereomonoY--2.0Y--Pentax KP
Pentax K-3 II« »YmonomonoYYmini3.0---Pentax K-3 II
Pentax K-3« »YmonomonoYYmini3.0---Pentax K-3
Sony A7 II« »YstereomonoYYmicro2.0YY-Sony A7 II
Sony A5100« »-stereomono--micro2.0YY-Sony A5100
Sony A6000« »Ystereomono--micro2.0YY-Sony A6000
Sony A3000« »Ystereomono--mini2.0---Sony A3000
Sony RX100« »-stereomono--micro2.0---Sony RX100

The K-70 is a recent model that features in the current product line-up of Pentax. In contrast, the Sony A58 has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the Sony A58 was succeeded by the Sony A68.

Review summary: Sony A58 vs Pentax K-70

So how do things add up? Is there a clear favorite between the Sony A58 and the Pentax K-70? The listing below highlights the relative strengths of the two models.

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Advantages of the Sony Alpha SLT-A58:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Less heavy: Is lighter (by 196g or 28 percent) and hence easier to carry around.
  • Longer lasting: Can take more shots (690 versus 410) on a single battery charge.
  • More heavily discounted: Has been available for much longer (launched in February 2013).

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Arguments in favor of the Pentax K-70:

  • More detail: Has more megapixels (24 vs 19.8MP), which boosts linear resolution by 10%.
  • 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 video autofocus: Features on-sensor phase-detection for more confident movie autofocus.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger screen: Has a bigger rear LCD (3.0" vs 2.7") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (921k vs 460k dots).
  • More flexible LCD: Has swivel screen for odd-angle shots in portrait or landscape orientation.
  • Faster shutter: Has higher mechanical shutter speed (6000/sec vs 4000/sec) to freeze action.
  • Faster burst: Shoots at higher frequency (6 vs 5 flaps/sec) to capture the decisive moment.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Easier file upload: Has wifi build in for automatic backup or image transfer to the web.
  • More modern: Reflects 3 years and 3 months of technical progress since the Sony A58 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the K-70 is the clear winner of the contest (13 : 5 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.

Sony A58 05:13 K-70

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 Sony A58 or the K-70. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased. This is where reviews by experts come in. The table below summarizes the assessments of some of the best known camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The detailed reviews can be accessed by clicking on the site logo in the table header.

Review Scores
  Camera
Model
cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(announced)
Launch
Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
Sony A58»--4.5/54.5/54.5/5 Feb 2013 599- i Sony A58
Pentax K-70«-79/1004.5/54/54.5/5 Jun 2016 649 i i Pentax K-70
Canon G7 X« »HiRec77/1004.5/53.5/54.5/5 Sep 2014 699- i Canon G7 X
Canon 100D« »Rec78/1004/54/54/5 Mar 2013 549- i Canon 100D
Canon 700D« »-76/1004.5/54.5/54.5/5 Mar 2013 649- i Canon 700D
Nikon D3300« »Rec77/1004.5/54.5/54.5/5 Jan 2014 499- i Nikon D3300
Nikon D3200« »HiRec73/1004.5/54.5/54.5/5 Apr 2012 599- i Nikon D3200
Olympus E-M1 II« »HiRec85/1004.5/55/54.5/5 Sep 2016 1,999 i i Olympus E-M1 II
Panasonic GH5« »HiRec85/1004.5/55/55/5 Jan 2017 1,999 i i Panasonic GH5
Pentax KP« »-82/1005/5-4.5/5 Jan 2017 1,099 i i Pentax KP
Pentax K-3 II« »--5/54.5/55/5 Apr 2015 1,099 i i Pentax K-3 II
Pentax K-3« »-83/1005/54.5/55/5 Oct 2013 1,299- i Pentax K-3
Sony A7 II« »Rec82/1004.5/55/55/5 Nov 2014 1,999- i Sony A7 II
Sony A5100« »Rec-4.5/54.5/55/5 Aug 2014 549 i i Sony A5100
Sony A6000« »Rec80/1004.5/55/55/5 Feb 2014 599- i Sony A6000
Sony A3000« »Rec-4/54.5/54/5 Aug 2013 329- i Sony A3000
Sony RX100« »HiRec78/1004/55/55/5 Jun 2012 649- i Sony RX100

Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. 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, 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. An an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool. If the camera you are interested in is not available, please send me an email, and I will try to update the database with the necessary infos.

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