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Sony A77 II vs Pentax K-1

The Sony Alpha SLT-A77 II and the Pentax K-1 are two enthusiast cameras that were announced, respectively, in May 2014 and February 2016. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (A77 II) and a full frame (K-1) sensor. The Sony has a resolution of 24 megapixels, whereas the Pentax provides 36.2 MP.

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

Headline Specifications
Sony A77 II
versus
Pentax K-1
Sony A77 II   Pentax K-1
Digital single lens reflex Digital single lens reflex
Sony A mount lenses Pentax K mount lenses
24 MP – APS-C sensor 36.2 MP – Full Frame sensor
1080/60p Video 1080/60i Video
ISO 100-25,600 (50 - 51,200) ISO 100-204,800
Electronic viewfinder (2359k dots) Optical viewfinder
3.0" LCD – 1229k dots 3.2" LCD – 1037k dots
Fully flexible screen (no touchscreen) Fully flexible screen (no touchscreen)
12 shutter flaps per second 4.4 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodyWeathersealed body
480 shots per battery charge760 shots per battery charge
143 x 104 x 81 mm, 647 g 137 x 110 x 86 mm, 1010 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha SLT-A77 II and the Pentax K-1? 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 physical size and weight of the Sony A77 II and the Pentax K-1 are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All size dimensions are rounded to the nearest millimeter.

The K-1 can be obtained in two different colors (black, silver), while the A77 II is only available in black.

Size Sony A77 II vs Pentax K-1
Compare A77 II versus K-1 top
Comparison A77 II or K-1 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-1 is somewhat larger (1 percent) than the Sony A77 II. Moreover, the K-1 is substantially heavier (56 percent) than the A77 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 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 A77 II gets 480 shots out of its Sony NP-FM500H battery, while the K-1 can take 760 images on a single charge of its Pentax D-LI90 power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. 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 A77 II 143 mm 104 mm 81 mm 647 g 480 Y May 2014 1,199ebay.com
2.
 
Pentax K-1 137 mm 110 mm 86 mm 1010 g 760 Y Feb 2016 1,799ebay.com
3.
 
Canon 5D Mark IV 151 mm 116 mm 76 mm 890 g 900 Y Aug 2016 3,499 amazon.com
4.
 
Nikon D500 147 mm 115 mm 81 mm 860 g 1240 Y Jan 2016 1,999ebay.com
5.
 
Nikon D7100 136 mm 107 mm 76 mm 765 g 950 Y Feb 2013 1,199ebay.com
6.
 
Nikon D7200 136 mm 107 mm 76 mm 765 g 1110 Y Mar 2015 1,199ebay.com
7.
 
Pentax K-1 II 137 mm 110 mm 86 mm 1010 g 670 Y Feb 2018 1,999 amazon.com
8.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 1,299ebay.com
9.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 1,099ebay.com
10.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999ebay.com
11.
 
Sony A7R IIIA 127 mm 96 mm 74 mm 650 g 650 Y Apr 2021 3,199 amazon.com
12.
 
Sony A58 129 mm 95 mm 78 mm 492 g 690 n Feb 2013 599ebay.com
13.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699ebay.com
14.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 1,399ebay.com
15.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 3,199ebay.com
16.
 
Sony A6500 120 mm 67 mm 53 mm 453 g 350 Y Oct 2016 1,399ebay.com
17.
 
Sony A6600 120 mm 67 mm 69 mm 503 g 810 Y Aug 2019 1,399 amazon.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 naturally be influenced heavily by the price. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The A77 II was launched at a markedly lower price (by 33 percent) than the K-1, 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

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Sony A77 II features an APS-C sensor and the Pentax K-1 a full frame sensor. The sensor area in the K-1 is 135 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Sony A77 II and Pentax K-1 sensor measures

With 36.2MP, the K-1 offers a higher resolution than the A77 II (24MP), but the K-1 nevertheless has larger individual pixels (pixel pitch of 4.88μm versus 3.91μm for the A77 II) due to its larger sensor. Moreover, the K-1 is a somewhat more recent model (by 1 year and 9 months) than the A77 II, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that the K-1 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Pentax K-1 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-1 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 Sony A77 II are 30 x 20 inches or 76.2 x 50.8 cm for good quality, 24 x 16 inches or 61 x 40.6 cm for very good quality, and 20 x 13.3 inches or 50.8 x 33.9 cm for excellent quality prints.

Unlike the A77 II, the K-1 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 SLT-A77 II 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-1 are ISO 100 to ISO 204800 (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.

A77 II versus K-1 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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. Of the two cameras under consideration, the K-1 offers substantially better image quality than the A77 II (overall score 14 points higher). The advantage is based on 1 bits higher color depth, 1.2 EV in additional dynamic range, and 1.7 stops in additional low light sensitivity. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

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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 A77 II APS-C 24.0 6000 40001080/60p24.413.4101382
2.
 
Pentax K-1 Full Frame 36.2 7360 49121080/60i25.414.6328096
3.
 
Canon 5D Mark IV Full Frame 30.1 6720 44804K/30p24.813.6299591
4.
 
Nikon D500 APS-C 20.7 5568 37124K/30p24.014.0132483
5.
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683
6.
 
Nikon D7200 APS-C 24.0 6000 40001080/60p24.514.6133387
7.
 
Pentax K-1 II Full Frame 36.2 7360 49121080/60i25.114.0269893
8.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
9.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
10.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
11.
 
Sony A7R IIIA Full Frame 42.2 7952 53044K/30p26.014.73523100
12.
 
Sony A58 APS-C 19.8 5456 36321080/60i23.312.575374
13.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
14.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178
15.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792
16.
 
Sony A6500 APS-C 24.0 6000 40004K/30p24.513.7140585
17.
 
Sony A6600 APS-C 24.0 6000 40004K/30p23.813.4149782
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the A77 II provides a higher frame rate than the K-1. 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 variety of features. For example, the A77 II has an electronic viewfinder (2359k dots), while the K-1 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 A77 II has a higher magnification than the one of the K-1 (0.73x vs 0.70x), 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 A77 II and Pentax K-1 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 A77 II2359 Y3.0 / 1229 full-flex n 1/8000s 12.0/s Y Y
2.
 
Pentax K-1optical Y3.2 / 1037 full-flex n 1/8000s 4.4/s n Y
3.
 
Canon 5D Mark IVoptical Y3.2 / 1620 fixed Y 1/8000s 7.0/s n n
4.
 
Nikon D500optical Y3.2 / 2359 tilting Y 1/8000s 10.0/s n n
5.
 
Nikon D7100optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
6.
 
Nikon D7200optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
7.
 
Pentax K-1 IIoptical Y3.2 / 1037 full-flex n 1/8000s 4.4/s n Y
8.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
9.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
10.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
11.
 
Sony A7R IIIA3686 n3.0 / 2340 tilting Y 1/8000s 10.0/s n Y
12.
 
Sony A581440 n2.7 / 460 tilting n 1/4000s 5.0/s Y Y
13.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
14.
 
Sony A772359 Y3.0 / 921 full-flex n 1/8000s 12.0/s Y Y
15.
 
Sony A99 II2400 Y3.0 / 1229 full-flex n 1/8000s 12.0/s n Y
16.
 
Sony A65002359 n3.0 / 922 tilting Y 1/4000s 11.0/s Y Y
17.
 
Sony A66002359 n3.0 / 922 tilting Y 1/4000s 11.0/s n Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The A77 II has one, while the K-1 does not. While the built-in flash of the A77 II is not very powerful, it can at times be useful as a fill-in light.

The A77 II has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the K-1 does not have a selfie-screen.

The Pentax K-1 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 A77 II writes its imaging data to SDXC or Memory Stick PRO Duo cards, while the K-1 uses SDXC cards. The K-1 features dual card slots, which can be very useful in case a memory card fails. In contrast, the A77 II 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 SLT-A77 II and Pentax K-1 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 A77 IIYstereo / monoY-mini2.0YY-
2.
 
Pentax K-1Ystereo / monoYYmicro2.0Y--
3.
 
Canon 5D Mark IVYmono / monoYYmini3.0YY-
4.
 
Nikon D500Ystereo / monoYYmini3.0YYY
5.
 
Nikon D7100Ystereo / monoYYmini2.0---
6.
 
Nikon D7200Ystereo / monoYYmini2.0YY-
7.
 
Pentax K-1 IIYstereo / monoYYmicro2.0Y--
8.
 
Pentax K-3Ymono / monoYYmini3.0---
9.
 
Pentax K-3 IIYmono / monoYYmini3.0---
10.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-
11.
 
Sony A7R IIIAYstereo / monoYYmicro3.2YYY
12.
 
Sony A58Ystereo / monoY-mini2.0---
13.
 
Sony A68Ystereo / monoY-micro2.0---
14.
 
Sony A77Ystereo / monoY-mini2.0---
15.
 
Sony A99 IIYstereo / monoYYmicro2.0YYY
16.
 
Sony A6500Ystereo / monoY-micro2.0YY-
17.
 
Sony A6600Ystereo / monoYYYES2.0YYY

It is notable that the K-1 has a headphone jack, which makes it possible to attach external headphones and monitor the quality of sound during the recording process. The A77 II lacks such a headphone port.

Both cameras feature a PC Sync terminal to control professional strobe lights, which will be appreciated by studio photographers.

Travel and landscape photographers will find it useful that the K-1 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the A77 II and the K-1 have been discontinued, but can regularly be found used on ebay. The K-1 was replaced by the Pentax K-1 II, while the A77 II does not have a direct successor. Further information on the features and operation of the A77 II and K-1 can be found, respectively, in the Sony A77 II Manual (free pdf) or the online Pentax K-1 Manual.

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Review summary

So what is the bottom line? Which of the two cameras – the Sony A77 II or the Pentax K-1 – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

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Advantages of the Sony Alpha SLT-A77 II:

  • 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.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.73x vs 0.70x).
  • More detailed LCD: Has a higher resolution rear screen (1229k vs 1037k dots).
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (12 vs 4.4 flaps/sec) to capture the decisive moment.
  • Less heavy: Is lighter (by 363g or 36 percent) and hence easier to carry around.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • More affordable: Was introduced into a lower priced category (33 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in May 2014).

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Reasons to prefer the Pentax K-1:

  • More detail: Has more megapixels (36.2 vs 24MP), which boosts linear resolution by 23%.
  • 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 image quality: Scores substantially higher (14 points) in the DXO overall evaluation.
  • More dynamic range: Captures a broader range of light and dark details (1.2 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (1.7 stops ISO advantage).
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Gets more shots (760 versus 480) out of a single battery charge.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More modern: Was introduced somewhat (1 year and 9 months) more recently.

If the count of individual advantages (bullet points above) is taken as a guide, the K-1 emerges as the winner of the match-up (14 : 12 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. 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.

A77 II 12:14 K-1

How about other alternatives? Do the specifications of the Sony A77 II and the Pentax K-1 place the cameras among the top in their class? Find out in the latest Best DSLR Camera listing whether the two cameras rank among the cream of the crop.

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 shooting experience and imaging performance when actually working with the A77 II or the K-1. 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 expert reviews 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.

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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 A77 II4/5....80/1004.5/55/5 May 2014 1,199ebay.com
2.
 
Pentax K-15/5....84/1005/55/5 Feb 2016 1,799ebay.com
3.
 
Canon 5D Mark IV4.5/5+ +4/587/1004.5/54.5/5 Aug 2016 3,499 amazon.com
4.
 
Nikon D5005/5+ +4.7/591/1004.5/55/5 Jan 2016 1,999ebay.com
5.
 
Nikon D71005/5+ +..85/1004.5/54.5/5 Feb 2013 1,199ebay.com
6.
 
Nikon D72004/5+ +..84/1004.5/54.5/5 Mar 2015 1,199ebay.com
7.
 
Pentax K-1 II....4.5/579/1004.5/54.5/5 Feb 2018 1,999 amazon.com
8.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 1,299ebay.com
9.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 1,099ebay.com
10.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999ebay.com
11.
 
Sony A7R IIIA..+ +4/590/1004.5/55/5 Apr 2021 3,199 amazon.com
12.
 
Sony A583/5......4.5/54.5/5 Feb 2013 599ebay.com
13.
 
Sony A683/5......4/54/5 Nov 2015 699ebay.com
14.
 
Sony A775/591/100..81/100..5/5 Aug 2011 1,399ebay.com
15.
 
Sony A99 II....4.5/585/1004.5/54.5/5 Sep 2016 3,199ebay.com
16.
 
Sony A65005/5+ +3.5/585/1004.5/54.5/5 Oct 2016 1,399ebay.com
17.
 
Sony A66004/5+4/583/1004.5/54/5 Aug 2019 1,399 amazon.com
Note: (+ +) 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. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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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 a corresponding selection in the search boxes below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Sony A77 II vs Pentax K-1

    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 A77 II Pentax K-1
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Sony A mount lenses Pentax K mount lenses
    Launch Date May 2014 February 2016
    Launch Price USD 1,199 USD 1,799
    Sensor Specs Sony A77 II Pentax K-1
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.5 x 15.6 mm 35.9 x 24.0 mm
    Sensor Area 366.6 mm2 861.6 mm2
    Sensor Diagonal 28.2 mm 43.2 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 24 Megapixels 36.2 Megapixels
    Image Resolution 6000 x 4000 pixels 7360 x 4912 pixels
    Pixel Pitch 3.91 μm 4.88 μm
    Pixel Density 6.55 MP/cm2 4.20 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability 1080/60p Video 1080/60i Video
    ISO Setting 100 - 25,600 ISO 100 - 204,800 ISO
    ISO Boost 50 - 51,200 ISO no Enhancement
    Image Processor BIONZ X PRIME IV
    DXO Sensor Quality (score) 82 96
    DXO Color Depth (bits) 24.4 25.4
    DXO Dynamic Range (EV) 13.4 14.6
    DXO Low Light (ISO) 1013 3280
    Screen Specs Sony A77 II Pentax K-1
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.73x 0.70x
    Viewfinder Resolution 2359k dots
    Top-Level Screen Control Panel Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 1229k dots 1037k dots
    LCD Attachment Fully flexible screen Fully flexible screen
    Shooting Specs Sony A77 II Pentax K-1
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/8000s
    Continuous Shooting 12 shutter flaps/s 4.4 shutter flaps/s
    Shutter Life Expectancy150 000 actuations300 000 actuations
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Built-in 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 A77 II Pentax K-1
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 2.0 USB 2.0
    HDMI Port mini HDMI micro HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Near-Field Communication NFC built-in no NFC
    Geotagging no internal GPS GPS built-in
    Body Specs Sony A77 II Pentax K-1
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Sony NP-FM500H Pentax D-LI90
    Battery Life (CIPA)480 shots per charge760 shots per charge
    Body Dimensions 143 x 104 x 81 mm
    (5.6 x 4.1 x 3.2 in)
    137 x 110 x 86 mm
    (5.4 x 4.3 x 3.4 in)
    Camera Weight 647 g (22.8 oz) 1010 g (35.6 oz)
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    Check A77 II offers at
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    Check K-1 offers at
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