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Pentax K-3 vs Sony A99

The Pentax K-3 and the Sony Alpha SLT-A99 are two digital cameras that were announced, respectively, in October 2013 and September 2012. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (K-3) and a full frame (A99) sensor. The Pentax has a resolution of 24.1 megapixels, whereas the Sony provides 24 MP.

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

Headline Specifications
Pentax K-3
versus
Sony A99
Pentax K-3   Sony A99
Digital single lens reflex Digital single lens reflex
Pentax K mount lenses Sony A mount lenses
24.1 MP – APS-C sensor 24 MP – Full Frame sensor
1080/60i Video 1080/60p Video
ISO 100-51,200 ISO 100-25,600
Optical viewfinder Electronic viewfinder (2359k dots)
3.2" LCD – 1037k dots 3.0" LCD – 1229k dots
Fixed screen (not touch-sensitive) Fully flexible screen (no touchscreen)
8.3 shutter flaps per second 6 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodyWeathersealed body
560 shots per battery charge500 shots per battery charge
131 x 100 x 77 mm, 800 g 147 x 111 x 78 mm, 812 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-3 and the Sony Alpha SLT-A99? 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 Pentax K-3 and the Sony A99 are illustrated in the side-by-side display below. 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 can be obtained in two different colors (black, silver), while the A99 is only available in black.

Size Pentax K-3 vs Sony A99
Compare K-3 versus A99 top
Comparison K-3 or A99 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A99 is notably larger (25 percent) than the Pentax K-3. Moreover, the A99 is slightly heavier (1 percent) than the K-3. 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 K-3 gets 560 shots out of its Pentax D-LI90 battery, while the A99 can take 500 images on a single charge of its Sony NP-FM500H power pack.

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
Street
Price
1.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 US$ 1 299ebay.com
2.
 
Sony A99 147 mm 111 mm 78 mm 812 g 500 Y Sep 2012 US$ 2 799ebay.com
3.
 
Nikon D7100 136 mm 107 mm 76 mm 765 g 950 Y Feb 2013 US$ 1 199ebay.com
4.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 US$ 1 099ebay.com
5.
 
Pentax K-5 131 mm 97 mm 73 mm 760 g 740 Y Sep 2010 US$ 1 099ebay.com
6.
 
Pentax K-5 II 131 mm 97 mm 73 mm 760 g 740 Y Sep 2012 US$ 1 099ebay.com
7.
 
Pentax K-50 130 mm 97 mm 71 mm 650 g 410 Y Jun 2013 US$ 599ebay.com
8.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 US$ 649ebay.com
9.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 US$ 1 099ebay.com
10.
 
Pentax K-S1 121 mm 93 mm 70 mm 558 g 410 n Aug 2014 US$ 749ebay.com
11.
 
Pentax K-S2 123 mm 91 mm 73 mm 678 g 410 Y Feb 2015 US$ 749ebay.com
12.
 
Sony A9 II 129 mm 96 mm 76 mm 678 g 690 Y Oct 2019 US$ 4 499 amazon.com
13.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 US$ 1 399ebay.com
14.
 
Sony A99 II 143 mm 104 mm 76 mm 849 g 490 Y Sep 2016 US$ 3 199ebay.com
15.
 
Sony A850 156 mm 117 mm 82 mm 895 g 880 Y Aug 2009 US$ 1 999ebay.com
16.
 
Sony A900 156 mm 117 mm 82 mm 895 g 880 Y Sep 2008 US$ 2 999ebay.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 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 K-3 was launched at a markedly lower price (by 54 percent) than the A99, 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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Pentax K-3 features an APS-C sensor and the Sony A99 a full frame sensor. The sensor area in the A99 is 132 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.

Pentax K-3 and Sony A99 sensor measures

Despite having a smaller sensor, the Pentax K-3 offers a higher resolution of 24.1 megapixels, compared with 24 MP of the Sony A99. This megapixels 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 5.96μm for the A99). However, it should be noted that the K-3 is a somewhat more recent model (by 1 year) than the A99, and its sensor might have benefitted from technological advances during this time that partly offset its pixel-size disadvantage. Coming back to sensor resolution, it should be mentioned that the K-3 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The Pentax K-3 has a native sensitivity range from ISO 100 to ISO 51200. The corresponding ISO settings for the Sony Alpha SLT-A99 are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 50-25600.

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.

K-3 versus A99 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 consideration, the A99 has a markedly higher DXO score than the K-3 (overall score 9 points higher), which will translate into better image quality. The advantage is based on 1.3 bits higher color depth, 0.6 EV in additional dynamic range, and 0.4 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.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
2.
 
Sony A99 Full Frame 24.0 6000 40001080/60p25.014.0155589
3.
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683
4.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
5.
 
Pentax K-5 APS-C 16.1 4928 32641080/25p23.714.1116282
6.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
7.
 
Pentax K-50 APS-C 16.1 4928 32641080/30p23.713.0112079
8.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i23.813.1163980
9.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
10.
 
Pentax K-S1 APS-C 20.0 5472 36481080/30p23.513.0106178
11.
 
Pentax K-S2 APS-C 20.0 5472 36481080/30p23.612.9151479
12.
 
Sony A9 II Full Frame 24.0 6000 40004K/30p25.014.0343493
13.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178
14.
 
Sony A99 II Full Frame 42.2 7952 53044K/30p25.413.4231792
15.
 
Sony A850 Full Frame 24.4 6048 4032none23.812.2141579
16.
 
Sony A900 Full Frame 24.4 6048 4032none23.712.3143179
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 A99 provides a faster frame rate than the K-3. It can shoot movie footage at 1080/60p, while the Pentax is limited to 1080/60i.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the A99 has an electronic viewfinder (2359k dots), while the K-3 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 A99 has a higher magnification than the one of the K-3 (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 Pentax K-3 and Sony A99 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.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
2.
 
Sony A992359 Y3.0 / 1229 full-flex n 1/8000s 6.0/s n Y
3.
 
Nikon D7100optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
4.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
5.
 
Pentax K-5optical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
6.
 
Pentax K-5 IIoptical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
7.
 
Pentax K-50optical n3.0 / 921 fixed n 1/6000s 6.0/s Y Y
8.
 
Pentax K-70optical n3.0 / 921 swivel n 1/6000s 6.0/s Y Y
9.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0/s Y Y
10.
 
Pentax K-S1optical n3.0 / 921 fixed n 1/6000s 5.4/s Y Y
11.
 
Pentax K-S2optical n3.0 / 921 swivel n 1/6000s 5.4/s Y Y
12.
 
Sony A9 II3686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
13.
 
Sony A772359 Y3.0 / 921 full-flex n 1/8000s 12.0/s Y Y
14.
 
Sony A99 II2400 Y3.0 / 1229 full-flex n 1/8000s 12.0/s n Y
15.
 
Sony A850optical Y3.0 / 922 fixed n 1/8000s 3.0/s n Y
16.
 
Sony A900optical Y3.0 / 922 fixed n 1/8000s 5.0/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 K-3 has one, while the A99 does not. While the built-in flash of the K-3 is not very powerful, it can at times be useful as a fill-in light.

The A99 has an articulated screen that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in taking selfies. In contrast, the K-3 does not have a selfie-screen.

The Pentax K-3 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 K-3 writes its imaging data to SDXC cards, while the A99 uses SDXC or Memory Stick PRO Duo cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. 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 Pentax K-3 and Sony Alpha SLT-A99 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.
 
Pentax K-3Ymono / monoYYmini3.0---
2.
 
Sony A99Ystereo / monoYYmini2.0---
3.
 
Nikon D7100Ystereo / monoYYmini2.0---
4.
 
Pentax K-3 IIYmono / monoYYmini3.0---
5.
 
Pentax K-5Ystereo / monoY-mini2.0---
6.
 
Pentax K-5 IIYstereo / monoY-mini2.0---
7.
 
Pentax K-50Ymono / mono--micro2.0---
8.
 
Pentax K-70Ystereo / monoY-mini2.0Y--
9.
 
Pentax KPYstereo / monoY--2.0Y--
10.
 
Pentax K-S1Ystereo / mono--micro2.0---
11.
 
Pentax K-S2Ymono / monoY-micro2.0YY-
12.
 
Sony A9 IIYstereo / monoYYmicro3.1YYY
13.
 
Sony A77Ystereo / monoY-mini2.0---
14.
 
Sony A99 IIYstereo / monoYYmicro2.0YYY
15.
 
Sony A850Y- / ---mini2.0---
16.
 
Sony A900Y- / ---mini2.0---

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 A99 has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the K-3 and the A99 have been discontinued, but can regularly be found used on ebay. The A99 was replaced by the Sony A99, while the K-3 was followed by the Pentax K-3 II. Further information on the features and operation of the K-3 and A99 can be found, respectively, in the Pentax K-3 Manual (free pdf) or the online Sony A99 Manual.

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Review summary

So what is the bottom line? Is there a clear favorite between the Pentax K-3 and the Sony A99? 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 Pentax K-3:

  • Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
  • 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.
  • Faster burst: Shoots at higher frequency (8.3 vs 6 flaps/sec) to capture the decisive moment.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • More compact: Is smaller (131x100mm vs 147x111mm) and thus needs less room in the bag.
  • Longer lasting: Can take more shots (560 versus 500) on a single battery charge.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • Faster data transfer: Supports a more advanced USB protocol (3.0 vs 2.0).
  • More affordable: Was introduced into a lower priced category (54 percent cheaper at launch).
  • More modern: Is somewhat more recent (announced 1 year after the A99).

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Reasons to prefer the Sony Alpha SLT-A99:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better image quality: Scores markedly higher (9 points) in the DXO overall evaluation.
  • Richer colors: Generates noticeably more natural colors (1.3 bits more color depth).
  • More dynamic range: Captures a broader range of light and dark details (0.6 EV of extra DR).
  • Better low-light sensitivity: Can shoot in dim conditions (0.4 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 (1229k vs 1037k dots).
  • More flexible LCD: Has a full-flex screen for odd-angle shots in portrait or landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • More heavily discounted: Has been on the market for longer (launched in September 2012).

If the count of relative strengths (bullet points above) is taken as a measure, the A99 emerges as the winner of the match-up (13 : 11 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.

K-3 11:13 A99

How about other alternatives? Do the specifications of the Pentax K-3 and the Sony A99 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 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 K-3 or the A99 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
Street
Price
1.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 US$ 1 299ebay.com
2.
 
Sony A995/5....84/1004.5/54.5/5 Sep 2012 US$ 2 799ebay.com
3.
 
Nikon D71005/5+ +..85/1004.5/54.5/5 Feb 2013 US$ 1 199ebay.com
4.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 US$ 1 099ebay.com
5.
 
Pentax K-54/5....83/1005/54.5/5 Sep 2010 US$ 1 099ebay.com
6.
 
Pentax K-5 II5/5....80/1005/54.5/5 Sep 2012 US$ 1 099ebay.com
7.
 
Pentax K-505/5......5/54.5/5 Jun 2013 US$ 599ebay.com
8.
 
Pentax K-704.5/5..4/579/1004.5/54.5/5 Jun 2016 US$ 649ebay.com
9.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 US$ 1 099ebay.com
10.
 
Pentax K-S14/5......4.5/54/5 Aug 2014 US$ 749ebay.com
11.
 
Pentax K-S24.5/5......5/54.5/5 Feb 2015 US$ 749ebay.com
12.
 
Sony A9 II....5/590/1005/55/5 Oct 2019 US$ 4 499 amazon.com
13.
 
Sony A775/591/100..81/100..5/5 Aug 2011 US$ 1 399ebay.com
14.
 
Sony A99 II....4.5/585/1004.5/54.5/5 Sep 2016 US$ 3 199ebay.com
15.
 
Sony A8503/5....75/100..4.5/5 Aug 2009 US$ 1 999ebay.com
16.
 
Sony A900..+ +..+ +4.5/55/5 Sep 2008 US$ 2 999ebay.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 comparisons of ratings among very different cameras or across long time periods 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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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: Pentax K-3 vs Sony A99

    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 Pentax K-3 Sony A99
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Pentax K mount lenses Sony A mount lenses
    Launch Date October 2013 September 2012
    Launch Price USD 1,299 USD 2,799
    Sensor Specs Pentax K-3 Sony A99
    Sensor Technology CMOS CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.5 x 15.6 mm 35.8 x 23.8 mm
    Sensor Area 366.6 mm2 852.04 mm2
    Sensor Diagonal 28.2 mm 43 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 24.1 Megapixels 24 Megapixels
    Image Resolution 6016 x 4000 pixels 6000 x 4000 pixels
    Pixel Pitch 3.90 μm 5.96 μm
    Pixel Density 6.56 MP/cm2 2.82 MP/cm2
    Moiré control no AA filter Anti-Alias filter
    Movie Capability 1080/60i Video 1080/60p Video
    ISO Setting 100 - 51,200 ISO 100 - 25,600 ISO
    ISO Boost no Enhancement 50 - 25,600 ISO
    Image Processor PRIME III BIONZ X
    DXO Sensor Quality (score) 80 89
    DXO Color Depth (bits) 23.7 25.0
    DXO Dynamic Range (EV) 13.4 14.0
    DXO Low Light (ISO) 1216 1555
    Screen Specs Pentax K-3 Sony A99
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.63x 0.71x
    Viewfinder Resolution 2359k dots
    Top-Level Screen Control Panel Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.2inch 3.0inch
    LCD Resolution 1037k dots 1229k dots
    LCD Attachment Fixed screen Fully flexible screen
    Shooting Specs Pentax K-3 Sony A99
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/8000s
    Continuous Shooting 8.3 shutter flaps/s 6 shutter flaps/s
    Shutter Life Expectancy200 000 actuations200 000 actuations
    Time-Lapse PhotographyIntervalometer built-inno Intervalometer
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash Built-in Flash no On-Board Flash
    Storage Medium SDXC cards MS or SDXC cards
    Single or Dual Card Slots Dual card slots Dual card slots
    UHS card support UHS-I UHS-I
    Connectivity Specs Pentax K-3 Sony A99
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket PC Sync socket
    USB Connector USB 3.0 USB 2.0
    HDMI Port mini HDMI mini HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket Headphone port Headphone port
    Wifi Support no Wifi no Wifi
    Geotagging no internal GPS GPS built-in
    Body Specs Pentax K-3 Sony A99
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Pentax D-LI90 Sony NP-FM500H
    Battery Life (CIPA)560 shots per charge500 shots per charge
    Body Dimensions 131 x 100 x 77 mm
    (5.2 x 3.9 x 3.0 in)
    147 x 111 x 78 mm
    (5.8 x 4.4 x 3.1 in)
    Camera Weight 800 g (28.2 oz) 812 g (28.6 oz)
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