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Canon R8 vs Pentax K-3 III

The Canon EOS R8 and the Pentax K-3 III are two digital cameras that were officially introduced, respectively, in February 2023 and March 2021. The R8 is a mirrorless interchangeable lens camera, while the K-3 III is a DSLR. The cameras are based on a full frame (R8) and an APS-C (K-3 III) sensor. The Canon has a resolution of 24 megapixels, whereas the Pentax provides 25.6 MP.

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

Headline Specifications
Canon R8
versus
Pentax K-3 III
Canon R8   Pentax K-3 III
Mirrorless system camera Digital single lens reflex
Canon RF mount lenses Pentax K mount lenses
24 MP – Full Frame sensor 25.6 MP – APS-C sensor
4k/60p Video 4K/30p Video
ISO 100-102,400 (100 - 204,800) ISO 100-160,000
Electronic viewfinder (2360k dots) Optical viewfinder
3.0" LCD – 1620k dots 3.2" LCD – 1620k dots
Swivel touchscreen Fixed touchscreen
6 shutter flaps per second 12 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
220 shots per battery charge800 shots per battery charge
133 x 86 x 70 mm, 461 g 135 x 104 x 74 mm, 820 g
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Check R8 price at
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Check K-3 III price at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS R8 and the Pentax K-3 III? 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

An illustration of the physical size and weight of the Canon R8 and the Pentax K-3 III is provided 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 size dimensions are rounded to the nearest millimeter.

The K-3 III can be obtained in two different colors (black, silver), while the R8 is only available in black.

Size Canon R8 vs Pentax K-3 III
Compare R8 versus K-3 III top
Comparison R8 or K-3 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-3 III is notably larger (23 percent) than the Canon R8. Moreover, the K-3 III is substantially heavier (78 percent) than the R8. It is noteworthy in this context that the K-3 III is splash and dust-proof, while the R8 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 R8 gets 220 shots out of its Canon LP-E17 battery, while the K-3 III can take 800 images on a single charge of its Pentax D-LI90 power pack. The power pack in the R8 can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

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
Street
Price
1.
 
Canon R8 133 mm 86 mm 70 mm 461 g 220 n Feb 2023 EUR 1 799 amazon.com
2.
 
Pentax K-3 III 135 mm 104 mm 74 mm 820 g 800 Y Mar 2021 EUR 1 999 amazon.com
3.
 
Canon 77D 131 mm 100 mm 76 mm 540 g 600 n Feb 2017 EUR 899ebay.com
4.
 
Canon 200D 122 mm 93 mm 70 mm 453 g 650 n Jun 2017 EUR 599ebay.com
5.
 
Canon 2000D 129 mm 101 mm 78 mm 475 g 500 n Feb 2018 EUR 499 amazon.com
6.
 
Canon G1 X Mark III 115 mm 78 mm 51 mm 399 g 200 Y Oct 2017 EUR 1 199ebay.com
7.
 
Canon M5 116 mm 89 mm 61 mm 427 g 295 n Sep 2016 EUR 1 129ebay.com
8.
 
Canon M6 112 mm 68 mm 45 mm 390 g 295 n Feb 2017 EUR 799ebay.com
9.
 
Canon M50 116 mm 88 mm 59 mm 390 g 235 n Feb 2018 EUR 779ebay.com
10.
 
Canon R10 123 mm 88 mm 83 mm 429 g 450 n May 2022 EUR 979 amazon.com
11.
 
Canon RP 133 mm 85 mm 70 mm 485 g 250 n Feb 2019 EUR 1 499 amazon.com
12.
 
Panasonic S5 133 mm 98 mm 82 mm 714 g 440 Y Sep 2020 EUR 1 999 amazon.com
13.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 EUR 1 299ebay.com
14.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 EUR 999ebay.com
15.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 EUR 699ebay.com
16.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 EUR 1 299ebay.com
17.
 
Sony NEX-7 120 mm 67 mm 43 mm 400 g 430 n Aug 2011 EUR 1 199ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The R8 was launched at a somewhat lower price (by 25 percent) than the K-3 III, which makes it more attractive for photographers on a tight budget. 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 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. 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 Canon R8 features a full frame sensor and the Pentax K-3 III an APS-C sensor. The sensor area in the K-3 III is 58 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Canon R8 and Pentax K-3 III sensor measures

Despite having a smaller sensor, the K-3 III offers a slightly higher resolution of 25.6 megapixels, compared with 24 MP of the R8. 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 3.76μm versus 5.98μm for the R8). Moreover, it should be noted that the R8 is a somewhat more recent model (by 1 year and 10 months) than the K-3 III, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the K-3 III has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The R8 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

Unlike the R8, the K-3 III has the capacity to capture high quality composite images (YESMP) 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 Canon EOS R8 has a native sensitivity range from ISO 100 to ISO 102400, which can be extended to ISO 100-204800. The corresponding ISO settings for the Pentax K-3 III are ISO 100 to ISO 160000 (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.

R8 versus K-3 III 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"). 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
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Canon R8 Full Frame 24.0 6000 40004k/60p24.514.7329593
2.
 
Pentax K-3 III APS-C 25.6 6192 41284K/30p24.213.7208385
3.
 
Canon 77D APS-C 24.0 6000 40001080/60p23.613.397178
4.
 
Canon 200D APS-C 24.0 6000 40001080/60p23.613.4104179
5.
 
Canon 2000D APS-C 24.0 6000 40001080/30p22.611.9100971
6.
 
Canon G1 X Mark III APS-C 24.0 6000 40001080/60p23.813.2164981
7.
 
Canon M5 APS-C 24.0 6000 40001080/60p23.412.4126277
8.
 
Canon M6 APS-C 24.0 6000 40001080/60p23.412.6131778
9.
 
Canon M50 APS-C 24.0 6000 40004K/24p23.813.3168481
10.
 
Canon R10 APS-C 24.0 6000 40004k/60p24.113.8208584
11.
 
Canon RP Full Frame 26.0 6240 41604K/30p24.311.9297785
12.
 
Panasonic S5 Full Frame 24.0 6000 40004K/60p25.114.5269794
13.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
14.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
15.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i23.813.1163980
16.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
17.
 
Sony NEX-7 APS-C 24.0 6000 40001080/60i24.113.4101681
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 are equipped with sensors that have a sufficiently high read-out speed for moving images, but the R8 provides a higher frame rate than the K-3 III. It can shoot video footage at 4k/60p, while the Pentax is limited to 4K/30p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the R8 has an electronic viewfinder (2360k dots), while the K-3 III 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%), as well as the same magnification (0.70x). The table below summarizes some of the other core capabilities of the Canon R8 and Pentax K-3 III 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.
 
Canon R82360 n3.0 / 1620 swivel Y 1/4000s 6.0/s n n
2.
 
Pentax K-3 IIIoptical Y3.2 / 1620 fixed Y 1/8000s 12.0/s n Y
3.
 
Canon 77Doptical Y3.0 / 1040 swivel Y 1/4000s 6.0/s Y n
4.
 
Canon 200Doptical n3.0 / 1040 swivel Y 1/4000s 5.0/s Y n
5.
 
Canon 2000Doptical n3.0 / 920 fixed n 1/4000s 3.0/s Y n
6.
 
Canon G1 X Mark III2360 n3.0 / 1040 swivel Y 1/2000s 9.0/s Y Y
7.
 
Canon M52360 n3.2 / 1620 tilting Y 1/4000s 9.0/s Y n
8.
 
Canon M6optional n3.0 / 1040 tilting Y 1/4000s 9.0/s Y n
9.
 
Canon M502360 n3.0 / 1040 swivel Y 1/4000s 10.0/s Y n
10.
 
Canon R102360 n3.0 / 1040 swivel Y 1/8000s 15.0/s Y n
11.
 
Canon RP2360 n3.0 / 1040 swivel Y 1/4000s 5.0/s n n
12.
 
Panasonic S52360 n3.0 / 1840 swivel Y 1/8000s 7.0/s n Y
13.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
14.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
15.
 
Pentax K-70optical n3.0 / 921 swivel n 1/6000s 6.0/s Y Y
16.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0/s Y Y
17.
 
Sony NEX-72359 n3.0 / 921 tilting n 1/4000s 10.0/s Y n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that differentiates the K-3 III and the R8 is in-body image stabilization (IBIS). The K-3 III reduces the risk of handshake-induced blur with all attached lenses, while the R8 offers no blur reduction with lenses that themselves do not provide optical image stabilization.

The R8 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-3 III does not have a selfie-screen.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the R8 is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Canon R8 and the Pentax K-3 III both have 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.

Concerning the storage of imaging data, both the R8 and the K-3 III write their files to SDXC cards. The K-3 III features dual card slots, which can be very useful in case a memory card fails. In contrast, the R8 only has one slot. Both the R8 and the K-3 III support UHS-II cards, which provide for Ultra High Speed data transfer of up to 312 MB/s (the second slot of the K-3 III only offers slower UHS-I transfer rates, though).

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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 Canon EOS R8 and Pentax K-3 III 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.
 
Canon R8Ystereo / monoYYmicro3.2Y-Y
2.
 
Pentax K-3 IIIYstereo / monoYYmicro3.2Y-Y
3.
 
Canon 77DYstereo / monoY-mini2.0YYY
4.
 
Canon 200DYstereo / monoY-mini2.0YYY
5.
 
Canon 2000DYmono / mono--mini2.0YY-
6.
 
Canon G1 X Mark IIIYstereo / mono--micro2.0YYY
7.
 
Canon M5Ystereo / monoY-mini2.0YYY
8.
 
Canon M6Ystereo / monoY-mini2.0YYY
9.
 
Canon M50Ystereo / monoY-micro2.0Y-Y
10.
 
Canon R10Ystereo / monoY-micro2.0Y-Y
11.
 
Canon RPYstereo / monoYYmicro2.0Y-Y
12.
 
Panasonic S5Ystereo / monoYYmicro3.2Y-Y
13.
 
Pentax K-3Ymono / monoYYmini3.0---
14.
 
Pentax K-3 IIYmono / monoYYmini3.0---
15.
 
Pentax K-70Ystereo / monoY-mini2.0Y--
16.
 
Pentax KPYstereo / monoY--2.0Y--
17.
 
Sony NEX-7Ystereo / monoY-mini2.0---

Studio photographers will appreciate that the Pentax K-3 III (unlike the R8) 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 III has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.

Both the R8 and the K-3 III are recent models that are part of the current product line-up. The K-3 III replaced the earlier Pentax K-3 II, while the R8 does not have a direct predecessor. Further information on the features and operation of the R8 and K-3 III can be found, respectively, in the Canon R8 Manual (free pdf) or the online Pentax K-3 III Manual.

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Review summary

So what conclusions can be drawn? Which of the two cameras – the Canon R8 or the Pentax K-3 III – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.

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Reasons to prefer the Canon EOS R8:

  • Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
  • Better image quality: Features a larger and more technologically advanced imaging sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Better video: Provides higher movie framerates (4k/60p versus 4K/30p).
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • More flexible LCD: Has a swivel 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.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (133x86mm vs 135x104mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 359g or 44 percent) and hence easier to carry around.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • More affordable: Was introduced into a lower priced segment (25 percent cheaper at launch).
  • More modern: Is somewhat more recent (announced 1 year and 10 months after the K-3 III).

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Advantages of the Pentax K-3 III:

  • 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.
  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 6 flaps/sec) to capture the decisive moment.
  • Longer lasting: Gets more shots (800 versus 220) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Easier geotagging: Features an internal GPS sensor to log localization data.
  • 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 heavily discounted: Has been on the market for longer (launched in March 2021).

If the count of relative strengths (bullet points above) is taken as a measure, the R8 emerges as the winner of the contest (17 : 14 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding 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.

R8 17:14 K-3 III

How about other alternatives? Do the specifications of the Canon R8 and the Pentax K-3 III place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the 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 R8 or the K-3 III. 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 where reviews by experts come in. 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.
 
Canon R84.5/5+ +4.5/587/1004/54.5/5 Feb 2023 EUR 1 799 amazon.com
2.
 
Pentax K-3 III4/5..3/5..4.5/5.. Mar 2021 EUR 1 999 amazon.com
3.
 
Canon 77D4.5/5..4/582/1004.5/54/5 Feb 2017 EUR 899ebay.com
4.
 
Canon 200D4/5+ +4/578/1004.5/54.5/5 Jun 2017 EUR 599ebay.com
5.
 
Canon 2000D3/5o3.5/5..3.5/53.5/5 Feb 2018 EUR 499 amazon.com
6.
 
Canon G1 X Mark III5/5+4/579/1004.5/54.5/5 Oct 2017 EUR 1 199ebay.com
7.
 
Canon M54/5+4/582/1004/54/5 Sep 2016 EUR 1 129ebay.com
8.
 
Canon M6......80/1004/54/5 Feb 2017 EUR 799ebay.com
9.
 
Canon M50..+4/579/100..3.5/5 Feb 2018 EUR 779ebay.com
10.
 
Canon R104/5..4.5/587/1004/54.5/5 May 2022 EUR 979 amazon.com
11.
 
Canon RP4/5+4/5..4.5/54/5 Feb 2019 EUR 1 499 amazon.com
12.
 
Panasonic S54.5/5+ +4.5/588/1004.5/54.5/5 Sep 2020 EUR 1 999 amazon.com
13.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 EUR 1 299ebay.com
14.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 EUR 999ebay.com
15.
 
Pentax K-704.5/5..4/579/1004.5/54.5/5 Jun 2016 EUR 699ebay.com
16.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 EUR 1 299ebay.com
17.
 
Sony NEX-75/5+ +..81/1004.5/55/5 Aug 2011 EUR 1 199ebay.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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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Check R8 price at
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Check K-3 III price at
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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 your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Canon R8 vs Pentax K-3 III

    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 Canon R8 Pentax K-3 III
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Canon RF mount lenses Pentax K mount lenses
    Launch Date February 2023 March 2021
    Launch Price USD 1,499 USD 1,999
    Sensor Specs Canon R8 Pentax K-3 III
    Sensor Technology CMOS CMOS
    Sensor Format Full Frame Sensor APS-C Sensor
    Sensor Size 35.9 x 23.9 mm 23.3 x 15.5 mm
    Sensor Area 858.01 mm2 361.15 mm2
    Sensor Diagonal 43.1 mm 28 mm
    Crop Factor 1.0x 1.5x
    Sensor Resolution 24 Megapixels 25.6 Megapixels
    Image Resolution 6000 x 4000 pixels 6192 x 4128 pixels
    Pixel Pitch 5.98 μm 3.76 μm
    Pixel Density 2.80 MP/cm2 7.08 MP/cm2
    Moiré control Anti-Alias filter no AA filter
    Movie Capability 4k/60p Video 4K/30p Video
    ISO Setting 100 - 102,400 ISO 100 - 160,000 ISO
    ISO Boost 100 - 204,800 ISO no Enhancement
    Image Processor DIGIC X PRIME V
    DXO Sensor Quality (score) 93 ..
    DXO Color Depth (bits) 24.5 ..
    DXO Dynamic Range (EV) 14.7 ..
    DXO Low Light (ISO) 3295 ..
    Screen Specs Canon R8 Pentax K-3 III
    Viewfinder Type Electronic viewfinder Optical viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.70x 0.70x
    Viewfinder Resolution 2360k dots
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 1620k dots 1620k dots
    LCD Attachment Swivel screen Fixed screen
    Touch Input Touchscreen Touchscreen
    Shooting Specs Canon R8 Pentax K-3 III
    Focus System On-Sensor Phase-detect Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 6 shutter flaps/s 12 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support UHS-II Single UHS-II
    Connectivity Specs Canon R8 Pentax K-3 III
    External Flash Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 3.2 USB 3.2
    HDMI Port micro HDMI micro HDMI
    Microphone Port External MIC port External MIC port
    Headphone Socket Headphone port Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Bluetooth Support Bluetooth built-in Bluetooth built-in
    Geotagging no internal GPS GPS built-in
    Body Specs Canon R8 Pentax K-3 III
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Canon LP-E17 Pentax D-LI90
    Battery Life (CIPA)220 shots per charge800 shots per charge
    In-Camera Charging USB charging no USB charging
    Body Dimensions 133 x 86 x 70 mm
    (5.2 x 3.4 x 2.8 in)
    135 x 104 x 74 mm
    (5.3 x 4.1 x 2.9 in)
    Camera Weight 461 g (16.3 oz) 820 g (28.9 oz)
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