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Sony A7R vs Pentax K-3 II

The Sony Alpha A7R and the Pentax K-3 II are two enthusiast cameras that were announced, respectively, in October 2013 and April 2015. The A7R is a mirrorless interchangeable lens camera, while the K-3 II is a DSLR. The cameras are based on a full frame (A7R) and an APS-C (K-3 II) sensor. The Sony has a resolution of 36.2 megapixels, whereas the Pentax provides 24.1 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Sony A7R
versus
Pentax K-3 II
Sony A7R   Pentax K-3 II
Mirrorless system camera Digital single lens reflex
Sony E mount lenses Pentax K mount lenses
36.2 MP – Full Frame sensor 24.1 MP – APS-C sensor
1080/60p Video 1080/60i Video
ISO 100-25,600 (50 - 51,200) ISO 100-51,200
Electronic viewfinder (2400k dots) Optical viewfinder
3.0" LCD – 1230k dots 3.2" LCD – 1037k dots
Tilting screen (no touchscreen) Fixed screen (not touch-sensitive)
4 shutter flaps per second 8.3 shutter flaps per second
Lens stabilization onlyIn-body stabilization
Weathersealed bodyWeathersealed body
340 shots per battery charge720 shots per battery charge
127 x 94 x 48 mm, 465 g 131 x 100 x 77 mm, 800 g
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Check A7R offers at
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Check K-3 II offers at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha A7R and the Pentax K-3 II? 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.

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Body comparison

The side-by-side display below illustrates the physical size and weight of the Sony A7R and the Pentax K-3 II. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All width, height and depth measures are rounded to the nearest millimeter.

The K-3 II can be obtained in two different colors (black, silver), while the A7R is only available in black.

Size Sony A7R vs Pentax K-3 II
Compare A7R versus K-3 II top
Comparison A7R or K-3 II rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-3 II is notably larger (10 percent) than the Sony A7R. Moreover, the K-3 II is substantially heavier (72 percent) than the A7R. 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 and compare 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 A7R gets 340 shots out of its Sony NP-FW50 battery, while the K-3 II can take 720 images on a single charge of its Pentax D-LI90 power pack. The power pack in the A7R can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Sony A7R 127 mm 94 mm 48 mm 465 g 340 Y Oct 2013 2,299ebay.com
2.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099ebay.com
3.
 
Nikon D810 146 mm 123 mm 82 mm 980 g 1200 Y Jun 2014 3,299ebay.com
4.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199ebay.com
5.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299ebay.com
6.
 
Pentax K-3 III 135 mm 104 mm 74 mm 820 g 800 Y Mar 2021 1,999 amazon.com
7.
 
Pentax K-5 II 131 mm 97 mm 73 mm 760 g 740 Y Sep 2012 1,099ebay.com
8.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 749ebay.com
9.
 
Sony A7 127 mm 94 mm 48 mm 474 g 340 Y Oct 2013 1,699ebay.com
10.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999ebay.com
11.
 
Sony A7 IV 131 mm 96 mm 80 mm 659 g 580 Y Oct 2021 2,499 amazon.com
12.
 
Sony A7C II 124 mm 71 mm 63 mm 514 g 540 Y Aug 2023 2,199 amazon.com
13.
 
Sony A7R II 127 mm 96 mm 60 mm 625 g 290 Y Jun 2015 3,199ebay.com
14.
 
Sony A7S 127 mm 94 mm 48 mm 489 g 380 Y Apr 2014 2,499ebay.com
15.
 
Sony RX1 113 mm 65 mm 70 mm 482 g 270 n Sep 2012 2,799ebay.com
16.
 
Sony RX1R 113 mm 65 mm 70 mm 482 g 270 n Jun 2013 2,799ebay.com
17.
 
Sony RX1R II 113 mm 65 mm 72 mm 507 g 220 n Oct 2015 3,299ebay.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 listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The K-3 II was launched at a markedly lower price (by 52 percent) than the A7R, 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.

Sensor comparison

The size of the imaging sensor is a crucial determinant 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. 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.

Of the two cameras under consideration, the Sony A7R features a full frame sensor and the Pentax K-3 II an APS-C sensor. The sensor area in the K-3 II 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 A7R and Pentax K-3 II sensor measures

With 36.2MP, the A7R offers a higher resolution than the K-3 II (24.1MP), but the A7R nevertheless has larger individual pixels (pixel pitch of 4.88μm versus 3.90μm for the K-3 II) due to its larger sensor. However, the K-3 II is a somewhat more recent model (by 1 year and 6 months) than the A7R, and its sensor might have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Sony A7R implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7R for good quality output (200 dots per inch) amounts to 36.8 x 24.6 inches or 93.5 x 62.4 cm, for very good quality (250 dpi) 29.4 x 19.6 inches or 74.8 x 49.9 cm, and for excellent quality (300 dpi) 24.5 x 16.4 inches or 62.3 x 41.6 cm. The corresponding values for the Pentax K-3 II are 30.1 x 20 inches or 76.4 x 50.8 cm for good quality, 24.1 x 16 inches or 61.1 x 40.6 cm for very good quality, and 20.1 x 13.3 inches or 50.9 x 33.9 cm for excellent quality prints.

Unlike the A7R, 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).

The Sony Alpha A7R has a native sensitivity range from ISO 100 to ISO 25600, which can be extended to ISO 50-51200. The corresponding ISO settings for the Pentax K-3 II are ISO 100 to ISO 51200 (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.

A7R versus K-3 II 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"). Of the two cameras under review, the A7R provides substantially higher image quality than the K-3 II, with an overall score that is 15 points higher. This advantage is based on 2 bits higher color depth, 0.5 EV in additional dynamic range, and 1.3 stops in additional low light sensitivity. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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Sensor Characteristics
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Sony A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
2.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
3.
 
Nikon D810 Full Frame 36.2 7360 49121080/60p25.714.8285397
4.
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387
5.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
6.
 
Pentax K-3 III APS-C 25.6 6192 41284K/30p24.213.7208385
7.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
8.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p23.612.9151479
9.
 
Sony A7 Full Frame 24.0 6000 40001080/60p24.814.2224890
10.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
11.
 
Sony A7 IV Full Frame 32.7 7008 46724K/60p25.414.7337997
12.
 
Sony A7C II Full Frame 32.7 7008 46724K/60p25.414.7323796
13.
 
Sony A7R II Full Frame 42.2 7952 53044K/30p26.013.9343498
14.
 
Sony A7S Full Frame 12.0 4240 28321080/60p23.913.2370287
15.
 
Sony RX1 Full Frame 24.0 6000 40001080/60p25.114.3253493
16.
 
Sony RX1R Full Frame 24.0 6000 40001080/60p25.013.6253791
17.
 
Sony RX1R II Full Frame 42.2 7952 53041080/60p25.813.9320497
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. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the A7R provides a higher frame rate than the K-3 II. It can shoot video footage at 1080/60p, while the Pentax is limited to 1080/60i.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the A7R has an electronic viewfinder (2400k 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 viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the A7R has a higher magnification than the one of the K-3 II (0.71x vs 0.63x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The table below summarizes some of the other core capabilities of the Sony A7R and Pentax K-3 II in connection with corresponding information for a sample of similar cameras.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Sony A7R2400 n3.0 / 1230 tilting n 1/8000s 4.0/s n n
2.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
3.
 
Nikon D810optical Y3.2 / 1229 fixed n 1/8000s 5.0/s Y n
4.
 
Nikon D7200optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
5.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
6.
 
Pentax K-3 IIIoptical Y3.2 / 1620 fixed Y 1/8000s 12.0/s n Y
7.
 
Pentax K-5 IIoptical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
8.
 
Pentax K-S2optical n3.0 / 921 swivel n 1/6000s 5.4/s Y Y
9.
 
Sony A72400 n3.0 / 1230 tilting n 1/8000s 5.0/s n n
10.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
11.
 
Sony A7 IV3686 n3.0 / 1037 swivel Y 1/8000s 10.0/s n Y
12.
 
Sony A7C II2360 n3.0 / 1037 swivel Y 1/4000s 10.0/s n Y
13.
 
Sony A7R II2400 n3.0 / 1229 tilting n 1/8000s 5.0/s n Y
14.
 
Sony A7S2400 n3.0 / 921 tilting n 1/8000s 5.0/s n n
15.
 
Sony RX1optional n3.0 / 1229 fixed n 1/4000s 5.0/s Y n
16.
 
Sony RX1Roptional n3.0 / 1229 fixed n 1/4000s 5.0/s Y n
17.
 
Sony RX1R II2360 n3.0 / 1229 tilting n 1/4000s 5.0/s n n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that differentiates the K-3 II and the A7R is in-body image stabilization (IBIS). The K-3 II reduces the risk of handshake-induced blur with all attached lenses, while the A7R offers no blur reduction with lenses that themselves do not provide optical image stabilization.

The Pentax K-3 II 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.

The A7R writes its imaging data to SDXC or Memory Stick PRO Duo cards, while the K-3 II uses SDXC cards. The K-3 II features dual card slots, which can be very useful in case a memory card fails. In contrast, the A7R only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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Connectivity comparison

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 Sony Alpha A7R and Pentax K-3 II and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Sony A7RYstereo / monoYYmicro2.0YY-
2.
 
Pentax K-3 IIYmono / monoYYmini3.0---
3.
 
Nikon D810Ystereo / monoYYmini3.0Y--
4.
 
Nikon D7200Ystereo / monoYYmini2.0YY-
5.
 
Pentax K-3Ymono / monoYYmini3.0---
6.
 
Pentax K-3 IIIYstereo / monoYYmicro3.2Y-Y
7.
 
Pentax K-5 IIYstereo / monoY-mini2.0---
8.
 
Pentax K-S2Ymono / monoY-micro2.0YY-
9.
 
Sony A7Ystereo / monoYYmicro2.0YY-
10.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-
11.
 
Sony A7 IVYstereo / monoYYfull3.2Y-Y
12.
 
Sony A7C IIYstereo / monoYYmicro3.2Y-Y
13.
 
Sony A7R IIYstereo / monoYYmicro2.0YY-
14.
 
Sony A7SYstereo / monoYYmicro2.0YY-
15.
 
Sony RX1Ystereo / monoY-mini2.0---
16.
 
Sony RX1RYstereo / monoY-mini2.0---
17.
 
Sony RX1R IIYstereo / monoY-micro2.0YY-

It is notable that the A7R offers wifi support, while the K-3 II does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Studio photographers will appreciate that the Pentax K-3 II (unlike the A7R) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Travel and landscape photographers will find it useful that the K-3 II has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the A7R and the K-3 II have been discontinued, but can regularly be found used on ebay. The A7R was replaced by the Sony A7R II, while the K-3 II was followed by the Pentax K-3 III. Further information on the features and operation of the A7R and K-3 II can be found, respectively, in the Sony A7R Manual (free pdf) or the online Pentax K-3 II Manual.

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Review summary

So what is the bottom line? Is there a clear favorite between the Sony A7R and the Pentax K-3 II? Which camera is better? A synthesis of the relative strong points of each of the models is listed below.

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Advantages of the Sony Alpha A7R:

  • More detail: Offers more megapixels (36.2 vs 24.1MP) with a 22% higher linear resolution.
  • Better image quality: Scores substantially higher (15 points) in the DXO overall assessment.
  • Richer colors: Generates images with noticeably better colors (2 bits more color depth).
  • Better low-light sensitivity: Requires less light for good images (1.3 stops ISO advantage).
  • Better video: Provides higher movie framerates (1080/60p versus 1080/60i).
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.71x vs 0.63x).
  • More detailed LCD: Has a higher resolution rear screen (1230k vs 1037k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Less heavy: Is lighter (by 335g or 42 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.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • More heavily discounted: Has been on the market for longer (launched in October 2013).

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Reasons to prefer the Pentax K-3 II:

  • 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: Features a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Faster burst: Shoots at higher frequency (8.3 vs 4 flaps/sec) to capture the decisive moment.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Gets more shots (720 versus 340) out of a single battery charge.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • Faster data transfer: Supports a more advanced USB protocol (3.0 vs 2.0).
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More affordable: Was introduced into a lower priced category (52 percent cheaper at launch).
  • More modern: Was introduced somewhat (1 year and 6 months) more recently.

If the count of relative strengths (bullet points above) is taken as a measure, the A7R comes out slightly ahead of the K-3 II (15 : 14 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

A7R 15:14 K-3 II

How about other alternatives? Do the specifications of the Sony A7R and the Pentax K-3 II 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the A7R or the K-3 II perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why hands-on reviews by experts are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear 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.

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Expert Camera Reviews
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Sony A7R5/5+ +..82/1004.5/55/5 Oct 2013 2,299ebay.com
2.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 1,099ebay.com
3.
 
Nikon D8105/5..5/586/1005/54.5/5 Jun 2014 3,299ebay.com
4.
 
Nikon D72004/5+ +..84/1004.5/54.5/5 Mar 2015 1,199ebay.com
5.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299ebay.com
6.
 
Pentax K-3 III4/5..3/5..4.5/5.. Mar 2021 1,999 amazon.com
7.
 
Pentax K-5 II5/5....80/1005/54.5/5 Sep 2012 1,099ebay.com
8.
 
Pentax K-S24.5/5......5/54.5/5 Feb 2015 749ebay.com
9.
 
Sony A75/5+ +..80/1005/55/5 Oct 2013 1,699ebay.com
10.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999ebay.com
11.
 
Sony A7 IV5/5+ +4.5/589/1004.5/54.5/5 Oct 2021 2,499 amazon.com
12.
 
Sony A7C II4/5..4/587/1004.5/54.5/5 Aug 2023 2,199 amazon.com
13.
 
Sony A7R II5/5+ +5/590/1005/55/5 Jun 2015 3,199ebay.com
14.
 
Sony A7S4/5....86/1004.5/55/5 Apr 2014 2,499ebay.com
15.
 
Sony RX15/5....79/1004/54.5/5 Sep 2012 2,799ebay.com
16.
 
Sony RX1R5/5......4/54.5/5 Jun 2013 2,799ebay.com
17.
 
Sony RX1R II5/5....82/100..4.5/5 Oct 2015 3,299ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated 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. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, 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.

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Check K-3 II offers at
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Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes 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.

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    Specifications: Sony A7R vs Pentax K-3 II

    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 Specifications
    Camera Model Sony A7R Pentax K-3 II
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Sony E mount lenses Pentax K mount lenses
    Launch Date October 2013 April 2015
    Launch Price USD 2,299 USD 1,099
    Sensor Specs Sony A7R Pentax K-3 II
    Sensor Technology CMOS CMOS
    Sensor Format Full Frame Sensor APS-C Sensor
    Sensor Size 35.9 x 24.0 mm 23.5 x 15.6 mm
    Sensor Area 861.6 mm2 366.6 mm2
    Sensor Diagonal 43.2 mm 28.2 mm
    Crop Factor 1.0x 1.5x
    Sensor Resolution 36.2 Megapixels 24.1 Megapixels
    Image Resolution 7360 x 4912 pixels 6016 x 4000 pixels
    Pixel Pitch 4.88 μm 3.90 μm
    Pixel Density 4.20 MP/cm2 6.56 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 1080/60p Video 1080/60i Video
    ISO Setting 100 - 25,600 ISO 100 - 51,200 ISO
    ISO Boost 50 - 51,200 ISO no Enhancement
    Image Processor BIONZ X PRIME III
    DXO Sensor Quality (score) 95 80
    DXO Color Depth (bits) 25.6 23.6
    DXO Dynamic Range (EV) 14.1 13.6
    DXO Low Light (ISO) 2746 1106
    Screen Specs Sony A7R Pentax K-3 II
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.71x 0.63x
    Viewfinder Resolution 2400k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 1230k dots 1037k dots
    LCD Attachment Tilting screen Fixed screen
    Shooting Specs Sony A7R Pentax K-3 II
    Focus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/8000s
    Continuous Shooting 4 shutter flaps/s 8.3 shutter flaps/s
    Shutter Life Expectancy250 000 actuations200 000 actuations
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium MS or SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support UHS-I UHS-I
    Connectivity Specs Sony A7R Pentax K-3 II
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 3.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket Headphone port Headphone port
    Wifi Support Wifi built-in no Wifi
    Near-Field Communication NFC built-in no NFC
    Geotagging no internal GPS GPS built-in
    Body Specs Sony A7R Pentax K-3 II
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Sony NP-FW50 Pentax D-LI90
    Battery Life (CIPA)340 shots per charge720 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 127 x 94 x 48 mm
    (5.0 x 3.7 x 1.9 in)
    131 x 100 x 77 mm
    (5.2 x 3.9 x 3.0 in)
    Camera Weight 465 g (16.4 oz) 800 g (28.2 oz)
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    Check K-3 II offers at
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