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Sony A77 vs Pentax K-1

The Sony Alpha SLT-A77 and the Pentax K-1 are two enthusiast cameras that were officially introduced, respectively, in August 2011 and February 2016. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (A77) 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
versus
Pentax K-1
Sony A77   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 100-16,000 (50 - 25,600) ISO 100-204,800
Electronic viewfinder (2359k dots) Optical viewfinder
3.0" LCD – 921k 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
470 shots per battery charge760 shots per battery charge
143 x 104 x 81 mm, 732 g 137 x 110 x 86 mm, 1010 g
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Check K-1 offers at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Sony Alpha SLT-A77 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 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 perspectives from the front, the top, and the back are available. All width, height and depth measures are rounded to the nearest millimeter.

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

Size Sony A77 vs Pentax K-1
Compare A77 versus K-1 top
Comparison A77 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. Moreover, the K-1 is substantially heavier (38 percent) than the A77. 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 gets 470 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 following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

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Body Specifications
# image Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 1,399ebay.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.
 
Canon 6D 145 mm 111 mm 71 mm 770 g 1090 Y Sep 2012 2,099ebay.com
5.
 
Nikon D500 147 mm 115 mm 81 mm 860 g 1240 Y Jan 2016 1,999ebay.com
6.
 
Panasonic GH5 139 mm 98 mm 87 mm 725 g 410 Y Jan 2017 1,999ebay.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.
 
Sony A7R IIIA 127 mm 96 mm 74 mm 650 g 650 Y Apr 2021 3,199 amazon.com
10.
 
Sony A6600 120 mm 67 mm 69 mm 503 g 810 Y Aug 2019 1,399 amazon.com
11.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499ebay.com
12.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 3,199ebay.com
13.
 
Sony A6500 120 mm 67 mm 53 mm 453 g 350 Y Oct 2016 1,399ebay.com
14.
 
Sony A68 143 mm 104 mm 81 mm 610 g 540 n Nov 2015 699ebay.com
15.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999ebay.com
16.
 
Sony A77 II 143 mm 104 mm 81 mm 647 g 480 Y May 2014 1,199ebay.com
17.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 2,799ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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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 was launched at a somewhat lower price (by 22 percent) than the K-1, which makes it more attractive for photographers on a tight budget. 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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Sony A77 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 and Pentax K-1 sensor measures

With 36.2MP, the K-1 offers a higher resolution than the A77 (24MP), but the K-1 nevertheless has larger individual pixels (pixel pitch of 4.88μm versus 3.91μm for the A77) due to its larger sensor. Moreover, the K-1 is a much more recent model (by 4 years and 5 months) than the A77, and its sensor will 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 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, 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 has a native sensitivity range from ISO 100 to ISO 16000, which can be extended to ISO 50-25600. 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 versus K-1 MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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"). Of the two cameras under consideration, the K-1 offers substantially better image quality than the A77 (overall score 18 points higher). The advantage is based on 1.4 bits higher color depth, 1.4 EV in additional dynamic range, and 2 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

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Sensor Characteristics
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178
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.
 
Canon 6D Full Frame 20.0 5472 36481080/30p23.812.1234082
5.
 
Nikon D500 APS-C 20.7 5568 37124K/30p24.014.0132483
6.
 
Panasonic GH5 Four Thirds 20.2 5184 38884K/60p23.913.080777
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.
 
Sony A7R IIIA Full Frame 42.2 7952 53044K/30p26.014.73523100
10.
 
Sony A6600 APS-C 24.0 6000 40004K/30p23.813.4149782
11.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.3351792
12.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792
13.
 
Sony A6500 APS-C 24.0 6000 40004K/30p24.513.7140585
14.
 
Sony A68 APS-C 24.0 6000 40001080/60i24.113.570179
15.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
16.
 
Sony A77 II APS-C 24.0 6000 40001080/60p24.413.4101382
17.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the A77 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 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 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 and Pentax K-1 in connection with corresponding information for a sample of similar cameras.

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Core Features
# image 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 A772359 Y3.0 / 921 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.
 
Canon 6Doptical Y3.0 / 1040 fixed n 1/4000s 4.5/s n n
5.
 
Nikon D500optical Y3.2 / 2359 tilting Y 1/8000s 10.0/s n n
6.
 
Panasonic GH53680 n3.2 / 1620 swivel Y 1/8000s 12.0/s n Y
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.
 
Sony A7R IIIA3686 n3.0 / 2340 tilting Y 1/8000s 10.0/s n Y
10.
 
Sony A66002359 n3.0 / 922 tilting Y 1/4000s 11.0/s n Y
11.
 
Sony A93686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
12.
 
Sony A99 II2400 Y3.0 / 1229 full-flex n 1/8000s 12.0/s n Y
13.
 
Sony A65002359 n3.0 / 922 tilting Y 1/4000s 11.0/s Y Y
14.
 
Sony A681440 Y2.7 / 460 tilting n 1/4000s 8.0/s Y Y
15.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
16.
 
Sony A77 II2359 Y3.0 / 1229 full-flex n 1/8000s 12.0/s Y Y
17.
 
Sony A992359 Y3.0 / 1229 full-flex n 1/8000s 6.0/s n Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One difference between the cameras concerns the presence of an on-board flash. The A77 has one, while the K-1 does not. While the built-in flash of the A77 is not very powerful, it can at times be useful as a fill-in light.

The A77 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 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 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 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
# image Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Sony A77Ystereo / monoY-mini2.0---
2.
 
Pentax K-1Ystereo / monoYYmicro2.0Y--
3.
 
Canon 5D Mark IVYmono / monoYYmini3.0YY-
4.
 
Canon 6DYmono / monoY-mini2.0Y--
5.
 
Nikon D500Ystereo / monoYYmini3.0YYY
6.
 
Panasonic GH5Ystereo / monoYYfull3.1Y-Y
7.
 
Pentax K-1 IIYstereo / monoYYmicro2.0Y--
8.
 
Pentax K-3Ymono / monoYYmini3.0---
9.
 
Sony A7R IIIAYstereo / monoYYmicro3.2YYY
10.
 
Sony A6600Ystereo / monoYYYES2.0YYY
11.
 
Sony A9Ystereo / monoYYmicro2.0YYY
12.
 
Sony A99 IIYstereo / monoYYmicro2.0YYY
13.
 
Sony A6500Ystereo / monoY-micro2.0YY-
14.
 
Sony A68Ystereo / monoY-micro2.0---
15.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-
16.
 
Sony A77 IIYstereo / monoY-mini2.0YY-
17.
 
Sony A99Ystereo / monoYYmini2.0---
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It is notable that the K-1 offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the A77 does not provide wifi capability.

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 both cameras feature internal geolocalization sensors and can record GPS coordinates in their EXIF data.

Both the A77 and the K-1 have been discontinued, but can regularly be found used on ebay. The A77 was replaced by the Sony A77 II, while the K-1 was followed by the Pentax K-1 II. Further information on the features and operation of the A77 and K-1 can be found, respectively, in the Sony A77 Manual (free pdf) or the online Pentax K-1 Manual.

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Review summary

So how do things add up? Is there a clear favorite between the Sony A77 and the Pentax K-1? Which camera is better? The listing below highlights the relative strengths of the two models.

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Advantages of the Sony Alpha SLT-A77:

  • 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 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 278g or 28 percent) and hence easier to carry around.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced segment (22 percent cheaper at launch).
  • More heavily discounted: Has been available for much longer (launched in August 2011).

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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 (18 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.4 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (1.4 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (2 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.
  • More detailed LCD: Has a higher resolution rear screen (1037k vs 921k dots).
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Longer lasting: Gets more shots (760 versus 470) out of a single battery charge.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More modern: Reflects 4 years and 5 months of technical progress since the A77 launch.

If the count of individual advantages (bullet points above) is taken as a guide, the K-1 is the clear winner of the contest (16 : 10 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 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.

A77 10:16 K-1

How about other alternatives? Do the specifications of the Sony A77 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 the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the A77 or the K-1 perform in practice. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why hands-on reviews by experts are important. The adjacent summary-table relays the overall verdicts of several of the most popular 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
# image  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Sony A775/591/100..81/100..5/5 Aug 2011 1,399ebay.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.
 
Canon 6D5/5+ +..83/1004.5/54.5/5 Sep 2012 2,099ebay.com
5.
 
Nikon D5005/5+ +4.7/591/1004.5/55/5 Jan 2016 1,999ebay.com
6.
 
Panasonic GH54.5/5+ +..85/1004.5/55/5 Jan 2017 1,999ebay.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.
 
Sony A7R IIIA..+ +4/590/1004.5/55/5 Apr 2021 3,199 amazon.com
10.
 
Sony A66004/5+4/583/1004.5/54/5 Aug 2019 1,399 amazon.com
11.
 
Sony A95/5+ +4.8/589/1005/55/5 Apr 2017 4,499ebay.com
12.
 
Sony A99 II....4.5/585/1004.5/54.5/5 Sep 2016 3,199ebay.com
13.
 
Sony A65005/5+ +3.5/585/1004.5/54.5/5 Oct 2016 1,399ebay.com
14.
 
Sony A683/5......4/54/5 Nov 2015 699ebay.com
15.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999ebay.com
16.
 
Sony A77 II4/5....80/1004.5/55/5 May 2014 1,199ebay.com
17.
 
Sony A995/5....84/1004.5/54.5/5 Sep 2012 2,799ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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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. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Sony A77 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 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 August 2011 February 2016
    Launch Price USD 1,399 USD 1,799
    Sensor Specs Sony A77 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 - 16,000 ISO 100 - 204,800 ISO
    ISO Boost 50 - 25,600 ISO no Enhancement
    Image Processor BIONZ X PRIME IV
    DXO Sensor Quality (score) 78 96
    DXO Color Depth (bits) 24.0 25.4
    DXO Dynamic Range (EV) 13.2 14.6
    DXO Low Light (ISO) 801 3280
    Screen Specs Sony A77 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 921k dots 1037k dots
    LCD Attachment Fully flexible screen Fully flexible screen
    Shooting Specs Sony A77 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 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 no Wifi Wifi built-in
    Geotagging GPS built-in GPS built-in
    Body Specs Sony A77 Pentax K-1
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Sony NP-FM500H Pentax D-LI90
    Battery Life (CIPA)470 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 732 g (25.8 oz) 1010 g (35.6 oz)
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