Pentax K-3 II vs Sony A5100
The Pentax K-3 II and the Sony Alpha A5100 are two digital cameras that were announced, respectively, in April 2015 and August 2014. The K-3 II is a DSLR, while the A5100 is a mirrorless interchangeable lens camera. Both cameras are equipped with an APS-C 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.
Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax K-3 II and the Sony Alpha A5100? 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.
Body comparison
The side-by-side display below illustrates the physical size and weight of the Pentax K-3 II and the Sony A5100. 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-3 II can be obtained in two different colors (black, silver), while the A5100 is also available in two color-versions, but different ones (black, white).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A5100 is considerably smaller (47 percent) than the Pentax K-3 II. Moreover, the A5100 is substantially lighter (65 percent) than the K-3 II. It is worth mentioning in this context that the K-3 II is splash and dust resistant, while the A5100 does not feature any corresponding weather-sealing.
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 II gets 720 shots out of its Pentax D-LI90 battery, while the A5100 can take 400 images on a single charge of its Sony NP-FW50 power pack. The power pack in the A5100 can be charged via the USB port, which can be very convenient 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.
Camera Model |
Camera Width |
Camera Height |
Camera Depth |
Camera Weight |
Battery Life |
Weather Sealing |
Camera Launch |
Launch Price |
Street Price |
||
---|---|---|---|---|---|---|---|---|---|---|---|
1. | Pentax K-3 II | 131 mm | 100 mm | 77 mm | 800 g | 720 | Y | Apr 2015 | US$ 1 099 | ebay.com | |
2. | Sony A5100 | 110 mm | 63 mm | 36 mm | 283 g | 400 | n | Aug 2014 | US$ 549 | ebay.com | |
3. | Nikon D7200 | 136 mm | 107 mm | 76 mm | 765 g | 1110 | Y | Mar 2015 | US$ 1 199 | ebay.com | |
4. | Pentax K-3 | 131 mm | 100 mm | 77 mm | 800 g | 560 | Y | Oct 2013 | US$ 1 299 | ebay.com | |
5. | Pentax K-3 III | 135 mm | 104 mm | 74 mm | 820 g | 800 | Y | Mar 2021 | US$ 1 999 | amazon.com | |
6. | Pentax K-5 | 131 mm | 97 mm | 73 mm | 760 g | 740 | Y | Sep 2010 | US$ 1 099 | ebay.com | |
7. | Pentax K-5 II | 131 mm | 97 mm | 73 mm | 760 g | 740 | Y | Sep 2012 | US$ 1 099 | ebay.com | |
8. | Pentax K-70 | 126 mm | 93 mm | 74 mm | 688 g | 410 | Y | Jun 2016 | US$ 649 | ebay.com | |
9. | Pentax KP | 132 mm | 101 mm | 76 mm | 703 g | 390 | Y | Jan 2017 | US$ 1 099 | ebay.com | |
10. | Pentax K-S1 | 121 mm | 93 mm | 70 mm | 558 g | 410 | n | Aug 2014 | US$ 749 | ebay.com | |
11. | Pentax K-S2 | 123 mm | 91 mm | 73 mm | 678 g | 410 | Y | Feb 2015 | US$ 749 | ebay.com | |
12. | Sony A77 II | 143 mm | 104 mm | 81 mm | 647 g | 480 | Y | May 2014 | US$ 1 199 | ebay.com | |
13. | Sony A3000 | 128 mm | 91 mm | 85 mm | 411 g | 470 | n | Aug 2013 | US$ 329 | ebay.com | |
14. | Sony A5000 | 110 mm | 63 mm | 36 mm | 269 g | 420 | n | Jan 2014 | US$ 449 | ebay.com | |
15. | Sony A6000 | 120 mm | 67 mm | 45 mm | 344 g | 360 | n | Feb 2014 | US$ 599 | ebay.com | |
16. | Sony NEX-3 | 117 mm | 62 mm | 33 mm | 297 g | 330 | n | May 2010 | US$ 599 | ebay.com | |
17. | Sony NEX-3N | 110 mm | 62 mm | 35 mm | 269 g | 480 | n | Feb 2013 | US$ 499 | ebay.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 A5100 was launched at a markedly lower price (by 50 percent) than the K-3 II, 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
Sensor comparison
The size of the sensor inside a digital camera is one of the key determinants of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.
Both cameras under consideration feature an APS-C sensor and have a format factor (sometimes also referred to as "crop factor") of 1.5. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.
While the two cameras under review share the same sensor size, the K-3 II offers a slightly higher resolution of 24.1 megapixels, compared with 24 MP of the A5100. This megapixels advantage translates into a 0.3 percent gain in linear resolution. On the other hand, these sensor specs imply that the K-3 II has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.90μm versus 3.91μm for the A5100). In this context, it should be noted, however, that the K-3 II is a somewhat more recent model (by 8 months) than the A5100, and its sensor might have benefitted from technological advances during this time that at least partly compensate for the smaller pixel size. Coming back to sensor resolution, it should be mentioned that the K-3 II has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
The A5100 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.
Unlike the A5100, 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 Pentax K-3 II has a native sensitivity range from ISO 100 to ISO 51200. The corresponding ISO settings for the Sony Alpha A5100 are ISO 100 to ISO 25600 (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.
Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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. The Overall DXO ratings for the two cameras under consideration are close, suggesting that they provide similar imaging performance. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.
Camera Model |
Sensor Class |
Resolution (MP) |
Horiz. Pixels |
Vert. Pixels |
Video Format |
DXO Portrait |
DXO Landscape |
DXO Sports |
DXO Overall |
||
---|---|---|---|---|---|---|---|---|---|---|---|
1. | Pentax K-3 II | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.6 | 13.6 | 1106 | 80 | |
2. | Sony A5100 | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 23.8 | 12.7 | 1347 | 80 | |
3. | Nikon D7200 | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 24.5 | 14.6 | 1333 | 87 | |
4. | Pentax K-3 | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.7 | 13.4 | 1216 | 80 | |
5. | Pentax K-3 III | APS-C | 25.6 | 6192 | 4128 | 4K/30p | 24.2 | 13.7 | 2083 | 85 | |
6. | Pentax K-5 | APS-C | 16.1 | 4928 | 3264 | 1080/25p | 23.7 | 14.1 | 1162 | 82 | |
7. | Pentax K-5 II | APS-C | 16.1 | 4928 | 3264 | 1080/25p | 23.8 | 14.1 | 1235 | 82 | |
8. | Pentax K-70 | APS-C | 24.0 | 6000 | 4000 | 1080/60i | 23.8 | 13.1 | 1639 | 80 | |
9. | Pentax KP | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.9 | 13.2 | 1699 | 81 | |
10. | Pentax K-S1 | APS-C | 20.0 | 5472 | 3648 | 1080/30p | 23.5 | 13.0 | 1061 | 78 | |
11. | Pentax K-S2 | APS-C | 20.0 | 5472 | 3648 | 1080/30p | 23.6 | 12.9 | 1514 | 79 | |
12. | Sony A77 II | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 24.4 | 13.4 | 1013 | 82 | |
13. | Sony A3000 | APS-C | 19.8 | 5456 | 3632 | 1080/60i | 23.7 | 12.8 | 1068 | 78 | |
14. | Sony A5000 | APS-C | 19.8 | 5456 | 3632 | 1080/60i | 23.8 | 13.0 | 1089 | 79 | |
15. | Sony A6000 | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 24.1 | 13.1 | 1347 | 82 | |
16. | Sony NEX-3 | APS-C | 14.0 | 4592 | 3056 | 720/30p | 22.1 | 12.0 | 830 | 68 | |
17. | Sony NEX-3N | APS-C | 16.0 | 4912 | 3264 | 1080/60i | 22.8 | 12.5 | 1067 | 74 | |
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. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the A5100 provides a faster frame rate than the K-3 II. It can shoot movie footage at 1080/60p, while the Pentax is limited to 1080/60i.
Feature comparison
Apart from body and sensor, cameras can and do differ across a range of features. For example, the K-3 II has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the A5100 relies on live view and the rear LCD for framing. The following table reports on some other key feature differences and similarities of the Pentax K-3 II, the Sony A5100, and comparable cameras.
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-3 II | optical | Y | 3.2 / 1037 | fixed | n | 1/8000s | 8.3/s | n | Y | |
2. | Sony A5100 | none | n | 3.0 / 922 | tilting | Y | 1/4000s | 6.0/s | Y | n | |
3. | Nikon D7200 | optical | Y | 3.2 / 1229 | fixed | n | 1/8000s | 6.0/s | Y | n | |
4. | Pentax K-3 | optical | Y | 3.2 / 1037 | fixed | n | 1/8000s | 8.3/s | Y | Y | |
5. | Pentax K-3 III | optical | Y | 3.2 / 1620 | fixed | Y | 1/8000s | 12.0/s | n | Y | |
6. | Pentax K-5 | optical | Y | 3.0 / 921 | fixed | n | 1/8000s | 7.0/s | Y | Y | |
7. | Pentax K-5 II | optical | Y | 3.0 / 921 | fixed | n | 1/8000s | 7.0/s | Y | Y | |
8. | Pentax K-70 | optical | n | 3.0 / 921 | swivel | n | 1/6000s | 6.0/s | Y | Y | |
9. | Pentax KP | optical | n | 3.0 / 921 | tilting | n | 1/6000s | 7.0/s | Y | Y | |
10. | Pentax K-S1 | optical | n | 3.0 / 921 | fixed | n | 1/6000s | 5.4/s | Y | Y | |
11. | Pentax K-S2 | optical | n | 3.0 / 921 | swivel | n | 1/6000s | 5.4/s | Y | Y | |
12. | Sony A77 II | 2359 | Y | 3.0 / 1229 | full-flex | n | 1/8000s | 12.0/s | Y | Y | |
13. | Sony A3000 | 202 | n | 3.0 / 230 | fixed | n | 1/4000s | 2.5/s | Y | n | |
14. | Sony A5000 | none | n | 3.0 / 461 | tilting | n | 1/4000s | 3.5/s | Y | n | |
15. | Sony A6000 | 1440 | n | 3.0 / 922 | tilting | n | 1/4000s | 11.0/s | Y | n | |
16. | Sony NEX-3 | optional | n | 3.0 / 920 | tilting | n | 1/4000s | 7.0/s | n | n | |
17. | Sony NEX-3N | optional | n | 3.0 / 460 | tilting | n | 1/4000s | 4.0/s | Y | n | |
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one. |
One feature that is present on the K-3 II, but is missing on the A5100 is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.
The A5100 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 II does not have a selfie-screen.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 K-3 II writes its imaging data to SDXC cards, while the A5100 uses SDXC or Memory Stick PRO Duo cards. The K-3 II features dual card slots, which can be very useful in case a memory card fails. In contrast, the A5100 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.
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 II and Sony Alpha A5100 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.
Camera Model |
Hotshoe Port |
Internal Mic / Speaker |
Microphone Port |
Headphone Port |
HDMI Port |
USB Port |
WiFi Support |
NFC Support |
Bluetooth Support |
||
---|---|---|---|---|---|---|---|---|---|---|---|
1. | Pentax K-3 II | Y | mono / mono | Y | Y | mini | 3.0 | - | - | - | |
2. | Sony A5100 | - | stereo / mono | - | - | micro | 2.0 | Y | Y | - | |
3. | Nikon D7200 | Y | stereo / mono | Y | Y | mini | 2.0 | Y | Y | - | |
4. | Pentax K-3 | Y | mono / mono | Y | Y | mini | 3.0 | - | - | - | |
5. | Pentax K-3 III | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
6. | Pentax K-5 | Y | stereo / mono | Y | - | mini | 2.0 | - | - | - | |
7. | Pentax K-5 II | Y | stereo / mono | Y | - | mini | 2.0 | - | - | - | |
8. | Pentax K-70 | Y | stereo / mono | Y | - | mini | 2.0 | Y | - | - | |
9. | Pentax KP | Y | stereo / mono | Y | - | - | 2.0 | Y | - | - | |
10. | Pentax K-S1 | Y | stereo / mono | - | - | micro | 2.0 | - | - | - | |
11. | Pentax K-S2 | Y | mono / mono | Y | - | micro | 2.0 | Y | Y | - | |
12. | Sony A77 II | Y | stereo / mono | Y | - | mini | 2.0 | Y | Y | - | |
13. | Sony A3000 | Y | stereo / mono | - | - | mini | 2.0 | - | - | - | |
14. | Sony A5000 | - | stereo / mono | - | - | micro | 2.0 | Y | Y | - | |
15. | Sony A6000 | Y | stereo / mono | - | - | micro | 2.0 | Y | Y | - | |
16. | Sony NEX-3 | Y | stereo / mono | - | - | mini | 2.0 | - | - | - | |
17. | Sony NEX-3N | - | stereo / mono | - | - | micro | 2.0 | - | - | - |
It is notable that the K-3 II has a hotshoe, while the A5100 does not. This socket makes it possible to easily attach optional accessories, such as an external flash gun.
Studio photographers will appreciate that the Pentax K-3 II (unlike the A5100) 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 K-3 II and the A5100 have been discontinued, but can regularly be found used on ebay. The K-3 II was replaced by the Pentax K-3 III, while the A5100 does not have a direct successor. Further information on the features and operation of the K-3 II and A5100 can be found, respectively, in the Pentax K-3 II Manual (free pdf) or the online Sony A5100 Manual.
Review summary
So how do things add up? Which of the two cameras – the Pentax K-3 II or the Sony A5100 – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.
Arguments in favor of the Pentax K-3 II:
- 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.
- More dynamic range: Captures a larger spectrum of light and dark details (0.9 EV of extra DR).
- Better sound: Can connect to an external microphone for higher quality sound recording.
- Better sound control: Has a headphone port that enables audio monitoring while recording.
- Easier framing: Has an optical viewfinder for image composition and settings control.
- Easier setting verification: Features an LCD display on top to control shooting parameters.
- 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 922k dots).
- Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
- 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.
- Longer lasting: Can take more shots (720 versus 400) on a single battery charge.
- Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
- Sharper images: Has hand-shake reducing image stabilization built-in.
- Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
- 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 modern: Is somewhat more recent (announced 8 months after the A5100).
Reasons to prefer the Sony Alpha A5100:
- 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).
- Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
- More compact: Is smaller (110x63mm vs 131x100mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 517g or 65 percent) and is thus easier to take along.
- Easier travel charging: Can be conveniently charged via its USB port.
- More legacy lens friendly: Can use many non-native lenses via adapters.
- Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
- 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 affordable: Was introduced into a lower priced category (50 percent cheaper at launch).
- More heavily discounted: Has been on the market for longer (launched in August 2014).
If the count of relative strengths (bullet points above) is taken as a measure, the K-3 II is the clear winner of the match-up (21 : 15 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.
How about other alternatives? Do the specifications of the Pentax K-3 II and the Sony A5100 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings 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 K-3 II or the A5100 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 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.
Camera Model |
AP score |
CL score |
DCW score |
DPR score |
EPZ score |
PB score |
Camera Launch |
Launch Price |
Street Price |
||
---|---|---|---|---|---|---|---|---|---|---|---|
1. | Pentax K-3 II | 4.5/5 | .. | .. | .. | 5/5 | 5/5 | Apr 2015 | US$ 1 099 | ebay.com | |
2. | Sony A5100 | 4.5/5 | + | .. | .. | 4.5/5 | 5/5 | Aug 2014 | US$ 549 | ebay.com | |
3. | Nikon D7200 | 4/5 | + + | .. | 84/100 | 4.5/5 | 4.5/5 | Mar 2015 | US$ 1 199 | ebay.com | |
4. | Pentax K-3 | 4/5 | .. | .. | 83/100 | 5/5 | 5/5 | Oct 2013 | US$ 1 299 | ebay.com | |
5. | Pentax K-3 III | 4/5 | .. | 3/5 | .. | 4.5/5 | .. | Mar 2021 | US$ 1 999 | amazon.com | |
6. | Pentax K-5 | 4/5 | .. | .. | 83/100 | 5/5 | 4.5/5 | Sep 2010 | US$ 1 099 | ebay.com | |
7. | Pentax K-5 II | 5/5 | .. | .. | 80/100 | 5/5 | 4.5/5 | Sep 2012 | US$ 1 099 | ebay.com | |
8. | Pentax K-70 | 4.5/5 | .. | 4/5 | 79/100 | 4.5/5 | 4.5/5 | Jun 2016 | US$ 649 | ebay.com | |
9. | Pentax KP | 4/5 | .. | 3/5 | 82/100 | 5/5 | 4.5/5 | Jan 2017 | US$ 1 099 | ebay.com | |
10. | Pentax K-S1 | 4/5 | .. | .. | .. | 4.5/5 | 4/5 | Aug 2014 | US$ 749 | ebay.com | |
11. | Pentax K-S2 | 4.5/5 | .. | .. | .. | 5/5 | 4.5/5 | Feb 2015 | US$ 749 | ebay.com | |
12. | Sony A77 II | 4/5 | .. | .. | 80/100 | 4.5/5 | 5/5 | May 2014 | US$ 1 199 | ebay.com | |
13. | Sony A3000 | 3/5 | + | .. | .. | 4/5 | 4/5 | Aug 2013 | US$ 329 | ebay.com | |
14. | Sony A5000 | 3/5 | + | .. | .. | 4.5/5 | 4.5/5 | Jan 2014 | US$ 449 | ebay.com | |
15. | Sony A6000 | 5/5 | + | 4.5/5 | 80/100 | 4.5/5 | 5/5 | Feb 2014 | US$ 599 | ebay.com | |
16. | Sony NEX-3 | .. | .. | .. | 70/100 | 4.5/5 | 4/5 | May 2010 | US$ 599 | ebay.com | |
17. | Sony NEX-3N | 3/5 | .. | .. | .. | 4.5/5 | 4.5/5 | Feb 2013 | US$ 499 | ebay.com | |
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available. |
Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.
Other camera comparisons
Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.
- Canon 1000D vs Sony A5100
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- Fujifilm X-T1 vs Sony A5100
- Nikon B600 vs Sony A5100
- Nikon D5300 vs Pentax K-3 II
- Nikon D850 vs Sony A5100
- Olympus E-M1X vs Pentax K-3 II
- Olympus E-P5 vs Pentax K-3 II
- Panasonic GH2 vs Pentax K-3 II
- Panasonic GX800 vs Sony A5100
- Pentax K-3 II vs Sony A7S
- Pentax K-3 II vs Sony ZV-1
Specifications: Pentax K-3 II vs Sony A5100
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 Model | Pentax K-3 II | Sony A5100 |
---|---|---|
Camera Type | Digital single lens reflex | Mirrorless system camera |
Camera Lens | Pentax K mount lenses | Sony E mount lenses |
Launch Date | April 2015 | August 2014 |
Launch Price | USD 1,099 | USD 549 |
Sensor Specs | Pentax K-3 II | Sony A5100 |
Sensor Technology | CMOS | CMOS |
Sensor Format | APS-C Sensor | APS-C Sensor |
Sensor Size | 23.5 x 15.6 mm | 23.5 x 15.6 mm |
Sensor Area | 366.6 mm2 | 366.6 mm2 |
Sensor Diagonal | 28.2 mm | 28.2 mm |
Crop Factor | 1.5x | 1.5x |
Sensor Resolution | 24.1 Megapixels | 24 Megapixels |
Image Resolution | 6016 x 4000 pixels | 6000 x 4000 pixels |
Pixel Pitch | 3.90 μm | 3.91 μm |
Pixel Density | 6.56 MP/cm2 | 6.55 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 |
Image Processor | PRIME III | BIONZ X |
DXO Sensor Quality (score) | 80 | 80 |
DXO Color Depth (bits) | 23.6 | 23.8 |
DXO Dynamic Range (EV) | 13.6 | 12.7 |
DXO Low Light (ISO) | 1106 | 1347 |
Screen Specs | Pentax K-3 II | Sony A5100 |
Viewfinder Type | Optical viewfinder | no viewfinder |
Viewfinder Field of View | 100% | |
Viewfinder Magnification | 0.63x | |
Top-Level Screen | Control Panel | no Top Display |
LCD Framing | Live View | Live View |
Rear LCD Size | 3.2inch | 3.0inch |
LCD Resolution | 1037k dots | 922k dots |
LCD Attachment | Fixed screen | Tilting screen |
Touch Input | no Touchscreen | Touchscreen |
Shooting Specs | Pentax K-3 II | Sony A5100 |
Focus System | Phase-detect AF | On-Sensor Phase-detect |
Manual Focusing Aid | Focus Peaking | Focus Peaking |
Max Shutter Speed (mechanical) | 1/8000s | 1/4000s |
Continuous Shooting | 8.3 shutter flaps/s | 6 shutter flaps/s |
Time-Lapse Photography | Intervalometer built-in | no Intervalometer |
Image Stabilization | In-body stabilization | Lens stabilization only |
Fill Flash | no On-Board Flash | Built-in Flash |
Storage Medium | SDXC cards | MS or SDXC cards |
Single or Dual Card Slots | Dual card slots | Single card slot |
UHS card support | UHS-I | UHS-I |
Connectivity Specs | Pentax K-3 II | Sony A5100 |
External Flash | Hotshoe | no Hotshoe |
Studio Flash | PC Sync socket | no PC Sync |
USB Connector | USB 3.0 | USB 2.0 |
HDMI Port | mini HDMI | micro HDMI |
Microphone Port | External MIC port | no MIC socket |
Headphone Socket | Headphone port | no Headphone port |
Wifi Support | no Wifi | Wifi built-in |
Near-Field Communication | no NFC | NFC built-in |
Geotagging | GPS built-in | no internal GPS |
Body Specs | Pentax K-3 II | Sony A5100 |
Environmental Sealing | Weathersealed body | not weather sealed |
Battery Type | Pentax D-LI90 | Sony NP-FW50 |
Battery Life (CIPA) | 720 shots per charge | 400 shots per charge |
In-Camera Charging | no USB charging | USB charging |
Body Dimensions |
131 x 100 x 77 mm (5.2 x 3.9 x 3.0 in) |
110 x 63 x 36 mm (4.3 x 2.5 x 1.4 in) |
Camera Weight | 800 g (28.2 oz) | 283 g (10.0 oz) |
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