PW

Sony A7 versus Pentax KP

The Sony Alpha A7 and the Pentax KP are two enthusiast cameras that were announced, respectively, in October 2013 and January 2017. The A7 is a mirrorless interchangeable lens camera, while the KP is a DSLR. The cameras are based on a full frame (A7) and an APS-C (KP) sensor. The Sony has a resolution of 24 megapixel, whereas the Pentax provides 24.1 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 A7 vs Pentax KP

The physical size and weight of the Sony A7 and the Pentax KP are illustrated in the side-by-side display below. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth measures are rounded to the nearest millimeter. You can also toggle the display to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left – the A7 – represents the basis or 100 percent across all the size and weight measures).

Compare Sony A7 vs Pentax KP
A7 versus KP top view
A7 and KP rear side

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax KP is notably larger (12 percent) than the Sony A7. Moreover, the KP is substantially heavier (48 percent) than the A7. 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 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 A7 gets 340 shots out of its NP-FW50 battery, while the KP can take 390 images on a single charge of its D-LI109 power pack.

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
Camera Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(y/n)
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Sony A7 (⇒ rgt) 5.0 in 3.7 in 1.9 in 16.7 oz 340 YES 2013 1,699discont. check
Pentax KP (⇒ lft) 5.2 in 4.0 in 3.0 in 24.8 oz 390 YES 2017 1,099 latest check
Nikon D610 (⇒ lft | rgt) 5.6 in 4.4 in 3.2 in 30.0 oz 900 YES 2013 1,999 latest check
Panasonic GH5 (⇒ lft | rgt) 5.5 in 3.9 in 3.4 in 25.6 oz 410 YES 2017 1,999 latest check
Panasonic GH4 (⇒ lft | rgt) 5.2 in 3.7 in 3.3 in 19.8 oz 500 YES 2014 1,499discont. check
Pentax K-70 (⇒ lft | rgt) 5.0 in 3.7 in 2.9 in 24.3 oz 410 YES 2016 649 latest check
Pentax K-3 II (⇒ lft | rgt) 5.2 in 3.9 in 3.0 in 28.2 oz 720 YES 2015 1,099 latest check
Pentax K-3 (⇒ lft | rgt) 5.2 in 3.9 in 3.0 in 28.2 oz 560 YES 2013 1,299discont. check
Pentax K-5 (⇒ lft | rgt) 5.2 in 3.8 in 2.9 in 26.8 oz 740 YES 2010 1,099discont. check
Sony A6300 (⇒ lft | rgt) 4.7 in 2.6 in 1.9 in 14.3 oz 400 YES 2016 999discont. check
Sony A6500 (⇒ lft | rgt) 4.7 in 2.6 in 2.1 in 16.0 oz 350 YES 2016 1,399 latest check
Sony A7 II (⇒ lft | rgt) 5.0 in 3.8 in 2.4 in 21.1 oz 350 YES 2014 1,999discont. check
Sony A7S (⇒ lft | rgt) 5.0 in 3.7 in 1.9 in 17.2 oz 380 YES 2014 2,499discont. check
Sony A5100 (⇒ lft | rgt) 4.3 in 2.5 in 1.4 in 10.0 oz 400 no 2014 549 latest check
Sony A7R (⇒ lft | rgt) 5.0 in 3.7 in 1.9 in 16.4 oz 340 YES 2013 2,299discont. check
Sony RX1R (⇒ lft | rgt) 4.4 in 2.6 in 2.8 in 17.0 oz 270 no 2013 2,799discont. check
Sony RX1 (⇒ lft | rgt) 4.4 in 2.6 in 2.8 in 17.0 oz 270 no 2012 2,799discont. check

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. The KP was launched at a markedly lower price (by 35 percent) than the A7, 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.

Sensor comparison: Sony A7 vs Pentax KP

The size of the sensor inside a digital camera is one of the key determinants 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Sony A7 features a full frame sensor and the Pentax KP an APS-C sensor. The sensor area in the KP is 57 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Sony A7 and Pentax KP sensor measures

Despite having a smaller sensor, the KP offers a slightly higher resolution of 24.1 megapixel, compared with 24 MP of the A7. This megapixel advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.90μm versus 5.97μm for the A7). However, it should be noted that the KP is much more recent (by 3 years and 3 months) than the A7, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. Coming back to sensor resolution, it should be mentioned that the KP has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

Unlike the A7, the KP 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).

A7 versus KP MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Sony A7 (⇒ rgt) Full Frame 24.0 6000 4000 1080/60p 24.8 14.2 2248 90
Pentax KP (⇒ lft) APS-C 24.1 6016 4000 1080/60i - - - -
Nikon D610 (⇒ lft | rgt) Full Frame 24.2 6016 4016 1080/30p 25.1 14.4 2925 94
Panasonic GH5 (⇒ lft | rgt) Four Thirds 20.2 5184 3888 4K/60p 23.9 13.0 807 77
Panasonic GH4 (⇒ lft | rgt) Four Thirds 15.9 4608 3456 4K/30p 23.2 12.8 791 74
Pentax K-70 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60i - - - -
Pentax K-3 II (⇒ lft | rgt) APS-C 24.1 6016 4000 1080/60i 23.6 13.6 1106 80
Pentax K-3 (⇒ lft | rgt) APS-C 24.1 6016 4000 1080/60i 23.7 13.4 1216 80
Pentax K-5 (⇒ lft | rgt) APS-C 16.1 4928 3264 1080/25p 23.7 14.1 1162 82
Sony A6300 (⇒ lft | rgt) APS-C 24.0 6000 4000 4K/30p 24.4 13.7 1437 85
Sony A6500 (⇒ lft | rgt) APS-C 24.0 6000 4000 4K/30p 24.5 13.7 1405 85
Sony A7 II (⇒ lft | rgt) Full Frame 24.0 6000 4000 1080/60p 24.9 13.6 2449 90
Sony A7S (⇒ lft | rgt) Full Frame 12.0 4240 2832 1080/60p 23.9 13.2 3702 87
Sony A5100 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 23.8 12.7 1347 80
Sony A7R (⇒ lft | rgt) Full Frame 36.2 7360 4912 1080/60p 25.6 14.1 2746 95
Sony RX1R (⇒ lft | rgt) Full Frame 24.0 6000 4000 1080/60p 25.0 13.6 2537 91
Sony RX1 (⇒ lft | rgt) Full Frame 24.0 6000 4000 1080/60p 25.1 14.3 2534 93

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 A7 provides a higher frame rate than the KP. It can shoot video footage at 1080/60p, while the Pentax is limited to 1080/60i.

Feature comparison: Sony A7 vs Pentax KP

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the A7 has an electronic viewfinder (2400k dots), while the KP 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 Sony A7 and Pentax KP 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.

Core Features
Camera Viewfinder
(Type or
'000 dots)
Control
Panel
(Y/n)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(Y/n)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec))
Build-in
Flash
(GN)
Build-in
Image
Stab
Sony A7 (⇒ rgt) 2400 no 3.0 1230 tilting no 8000 5.0 no no
Pentax KP (⇒ lft) optical no 3.0 921 tilting no 6000 7.0 YES YES
Nikon D610 (⇒ lft | rgt) optical YES 3.2 921 fixed no 4000 6.0 12 no
Panasonic GH5 (⇒ lft | rgt) 3680 no 3.2 1620 swivel YES 8000 12.0 no YES
Panasonic GH4 (⇒ lft | rgt) 2359 no 3.0 1036 swivel YES 8000 12.0 17 no
Pentax K-70 (⇒ lft | rgt) optical no 3.0 921 swivel no 6000 6.0 YES YES
Pentax K-3 II (⇒ lft | rgt) optical YES 3.2 1037 fixed no 8000 8.3 no YES
Pentax K-3 (⇒ lft | rgt) optical YES 3.2 1037 fixed no 8000 8.3 13 YES
Pentax K-5 (⇒ lft | rgt) optical YES 3.0 921 fixed no 8000 7.0 13 YES
Sony A6300 (⇒ lft | rgt) 2300 no 3.0 922 tilting no 4000 11.0 6 no
Sony A6500 (⇒ lft | rgt) 2300 no 3.0 922 tilting YES 4000 11.0 6 YES
Sony A7 II (⇒ lft | rgt) 2400 no 3.0 1230 tilting no 8000 5.0 no YES
Sony A7S (⇒ lft | rgt) 2400 no 3.0 921 tilting no 8000 5.0 no no
Sony A5100 (⇒ lft | rgt) no no 3.0 922 tilting YES 4000 6.0 4 no
Sony A7R (⇒ lft | rgt) 2400 no 3.0 1230 tilting no 8000 4.0 no no
Sony RX1R (⇒ lft | rgt) no no 3.0 1229 fixed no 4000 5.0 6 no
Sony RX1 (⇒ lft | rgt) no no 3.0 1229 fixed no 4000 5.0 6 no

The KP is a current model that online retailers, such as amazon, will have in stock. In contrast, the A7 has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the A7 was succeeded by the Sony A7 II.

Review summary: Sony A7 vs Pentax KP

So what conclusions can be drawn? Which of the two cameras – the Sony A7 or the Pentax KP – has the upper hand? A synthesis of the relative strong points of each of the models is listed below.


logo checkmark

Reasons to prefer the Sony Alpha A7:

  • 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 detailed LCD: Has a higher resolution rear screen (1230k vs 921k dots).
  • Faster shutter: Has higher mechanical shutter speed (8000/sec vs 6000/sec) to freeze action.
  • More compact: Is smaller (127x94mm vs 132x101mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 229g or 33 percent) and hence easier to carry around.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • More heavily discounted: Has been available for much longer (launched in October 2013).

logo checkmark

Advantages of the Pentax KP:

  • 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.
  • Faster burst: Shoots at higher frequency (7 vs 5 flaps/sec) to capture the decisive moment.
  • Longer lasting: Gets more shots (390 versus 340) out of a single battery charge.
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • Sharper images: Has stabilization technology build-in to reduce the impact of hand-shake.
  • More affordable: Was introduced into a lower priced category (35 percent cheaper at launch).
  • More modern: Reflects 3 years and 3 months of technical progress since the A7 launch.

If the count of relative strengths (bullet points above) is taken as a measure, the match-up finishes in a tie (9 points each). 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.

A7 09:09 KP

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the A7 or the KP. 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 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 detailed reviews can be accessed by clicking on the site logo in the table header.

Review scores
Camera cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Sony A7 (⇒ rgt) HiRec 80/100 Silver 5/5 4.5/5 5/5 2013 1,699discont. check
Pentax KP (⇒ lft) - 82/100 Silver 5/5 - 4.5/5 2017 1,099 latest check
Nikon D610 (⇒ lft | rgt) HiRec 87/100 Gold 4.5/5 4.5/5 4.5/5 2013 1,999 latest check
Panasonic GH5 (⇒ lft | rgt) HiRec 85/100 Gold 4.5/5 5/5 5/5 2017 1,999 latest check
Panasonic GH4 (⇒ lft | rgt) HiRec 85/100 Gold 5/5 5/5 5/5 2014 1,499discont. check
Pentax K-70 (⇒ lft | rgt) - 79/100 Silver 4.5/5 4/5 4.5/5 2016 649 latest check
Pentax K-3 II (⇒ lft | rgt) - - 5/5 4.5/5 5/5 2015 1,099 latest check
Pentax K-3 (⇒ lft | rgt) - 83/100 Gold 5/5 4.5/5 5/5 2013 1,299discont. check
Pentax K-5 (⇒ lft | rgt) - 83/100 Gold 5/5 4.5/5 4.5/5 2010 1,099discont. check
Sony A6300 (⇒ lft | rgt) Rec 85/100 Gold 5/5 5/5 5/5 2016 999discont. check
Sony A6500 (⇒ lft | rgt) HiRec 85/100 Silver 4.5/5 5/5 4.5/5 2016 1,399 latest check
Sony A7 II (⇒ lft | rgt) Rec 82/100 Silver 4.5/5 5/5 5/5 2014 1,999discont. check
Sony A7S (⇒ lft | rgt) - 86/100 Gold 4.5/5 4.5/5 5/5 2014 2,499discont. check
Sony A5100 (⇒ lft | rgt) Rec - 4.5/5 4.5/5 5/5 2014 549 latest check
Sony A7R (⇒ lft | rgt) HiRec 82/100 Gold 4.5/5 5/5 5/5 2013 2,299discont. check
Sony RX1R (⇒ lft | rgt) - - 4/5 reviewed 4.5/5 2013 2,799discont. check
Sony RX1 (⇒ lft | rgt) - 79/100 Gold 4/5 4.5/5 4.5/5 2012 2,799discont. check

The above review scores should be interpreted with care, though. The ratings are only valid when refering to cameras in the same category and of the same age. 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. If the camera you are interested in is not available, kindly get in touch, and I will try to add information on that model to the database.

vs

    You are here  »   »