Canon 1D Mark III vs Pentax K-3 III
The Canon EOS-1D Mark III and the Pentax K-3 III are two digital cameras that were revealed to the public, respectively, in February 2007 and March 2021. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-H (1D Mark III) and an APS-C (K-3 III) sensor. The Canon has a resolution of 10.1 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.

Check 1D Mark III offers 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-1D Mark III 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.
Body comparison
The side-by-side display below illustrates the physical size and weight of the Canon 1D Mark III and the Pentax K-3 III. 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 1D Mark III is only available in black.



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 considerably smaller (43 percent) than the Canon 1D Mark III. Moreover, the K-3 III is markedly lighter (29 percent) than the 1D Mark III. 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 1D Mark III gets 2200 shots out of its Canon LP-E4 battery, while the K-3 III can take 800 images on a single charge of its Pentax D-LI90 power pack. As can be seen in the images above, the 1D Mark III has a battery grip built in. This facilitates image-taking in portrait orientation and gives it additional battery power. In order to provide similar functionality for the K-3 III, Pentax provides the D-BG8 vertical grip as an optional accessory (see here on ebay).
The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. 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. | Canon 1D Mark III | 156 mm | 157 mm | 80 mm | 1155 g | 2200 | Y | Feb 2007 | US$ 4 499 | ebay.com | |
| 2. | Pentax K-3 III | 135 mm | 104 mm | 74 mm | 820 g | 800 | Y | Mar 2021 | US$ 1 999 | amazon.com | |
| 3. | Canon 1D Mark II | 156 mm | 158 mm | 80 mm | 1535 g | 1200 | Y | Jan 2004 | US$ 4 499 | ebay.com | |
| 4. | Canon 1D Mark IV | 156 mm | 157 mm | 80 mm | 1230 g | 1500 | Y | Oct 2009 | US$ 4 999 | ebay.com | |
| 5. | Canon 1Ds | 156 mm | 158 mm | 80 mm | 1265 g | 600 | Y | Sep 2002 | US$ 8 999 | ebay.com | |
| 6. | Canon 1Ds Mark III | 150 mm | 160 mm | 80 mm | 1385 g | 1800 | Y | Aug 2007 | US$ 7 999 | ebay.com | |
| 7. | Canon 5D Mark II | 152 mm | 114 mm | 75 mm | 850 g | 850 | Y | Sep 2008 | US$ 3 499 | ebay.com | |
| 8. | Canon 5D Mark III | 152 mm | 116 mm | 76 mm | 950 g | 950 | Y | Mar 2012 | US$ 3 499 | ebay.com | |
| 9. | Canon 5DS R | 152 mm | 116 mm | 76 mm | 930 g | 700 | Y | Feb 2015 | US$ 3 699 | ebay.com | |
| 10. | Nikon D2Xs | 158 mm | 150 mm | 86 mm | 1252 g | 3800 | Y | Jun 2006 | US$ 4 699 | ebay.com | |
| 11. | Nikon D3 | 160 mm | 157 mm | 88 mm | 1300 g | 4300 | Y | Aug 2007 | US$ 4 999 | ebay.com | |
| 12. | Nikon D3S | 160 mm | 157 mm | 88 mm | 1240 g | 4200 | Y | Oct 2009 | US$ 5 199 | ebay.com | |
| 13. | Panasonic S5 | 133 mm | 98 mm | 82 mm | 714 g | 440 | Y | Sep 2020 | US$ 1 999 | amazon.com | |
| 14. | Pentax K-3 | 131 mm | 100 mm | 77 mm | 800 g | 560 | Y | Oct 2013 | US$ 1 299 | ebay.com | |
| 15. | Pentax K-3 II | 131 mm | 100 mm | 77 mm | 800 g | 720 | Y | Apr 2015 | US$ 1 099 | ebay.com | |
| 16. | Pentax K-70 | 126 mm | 93 mm | 74 mm | 688 g | 410 | Y | Jun 2016 | US$ 649 | ebay.com | |
| 17. | Pentax KP | 132 mm | 101 mm | 76 mm | 703 g | 390 | Y | Jan 2017 | US$ 1 099 | ebay.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 manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The K-3 III was launched at a markedly lower price (by 56 percent) than the 1D Mark III, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down.
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. 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 Canon 1D Mark III features an APS-H sensor and the Pentax K-3 III an APS-C sensor. The sensor area in the K-3 III is 31 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.3 and 1.5. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Despite having a smaller sensor, the K-3 III offers a higher resolution of 25.6 megapixels, compared with 10.1 MP of the 1D Mark III. 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 7.21μm for the 1D Mark III). However, it should be noted that the K-3 III is much more recent (by 14 years and 1 month) than the 1D Mark III, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. 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 resolution advantage of the Pentax K-3 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-3 III for good quality output (200 dots per inch) amounts to 31 x 20.6 inches or 78.6 x 52.4 cm, for very good quality (250 dpi) 24.8 x 16.5 inches or 62.9 x 41.9 cm, and for excellent quality (300 dpi) 20.6 x 13.8 inches or 52.4 x 35 cm. The corresponding values for the Canon 1D Mark III are 19.4 x 13 inches or 49.4 x 32.9 cm for good quality, 15.6 x 10.4 inches or 39.5 x 26.3 cm for very good quality, and 13 x 8.6 inches or 32.9 x 21.9 cm for excellent quality prints.
Unlike the 1D Mark III, 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-1D Mark III has a native sensitivity range from ISO 100 to ISO 3200, which can be extended to ISO 50-6400. 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.

Consistent information on actual sensor performance is available from DXO Mark for many cameras. 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.

| Camera Model |
Sensor Class |
Resolution (MP) |
Horiz. Pixels |
Vert. Pixels |
Video Format |
DXO Portrait |
DXO Landscape |
DXO Sports |
DXO Overall |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Canon 1D Mark III | APS-H | 10.1 | 3888 | 2592 | none | 22.7 | 11.7 | 1078 | 71 | |
| 2. | Pentax K-3 III | APS-C | 25.6 | 6192 | 4128 | 4K/30p | 24.2 | 13.7 | 2083 | 85 | |
| 3. | Canon 1D Mark II | APS-H | 8.2 | 3504 | 2336 | none | 22.3 | 11.1 | 1003 | 66 | |
| 4. | Canon 1D Mark IV | APS-H | 16.0 | 4896 | 3264 | 1080/30p | 22.8 | 12.0 | 1320 | 74 | |
| 5. | Canon 1Ds | Full Frame | 11.0 | 4064 | 2704 | none | 21.8 | 11.0 | 954 | 63 | |
| 6. | Canon 1Ds Mark III | Full Frame | 21.0 | 5616 | 3744 | none | 24.0 | 12.0 | 1663 | 80 | |
| 7. | Canon 5D Mark II | Full Frame | 21.0 | 5616 | 3744 | 1080/30p | 23.7 | 11.9 | 1815 | 79 | |
| 8. | Canon 5D Mark III | Full Frame | 22.1 | 5760 | 3840 | 1080/30p | 24.0 | 11.7 | 2293 | 81 | |
| 9. | Canon 5DS R | Full Frame | 50.3 | 8688 | 5792 | 1080/30p | 24.6 | 12.4 | 2308 | 86 | |
| 10. | Nikon D2Xs | APS-C | 12.2 | 4288 | 2848 | none | 22.2 | 10.9 | 489 | 59 | |
| 11. | Nikon D3 | Full Frame | 12.1 | 4256 | 2832 | none | 23.5 | 12.2 | 2290 | 81 | |
| 12. | Nikon D3S | Full Frame | 12.1 | 4256 | 2832 | 720/24p | 23.5 | 12.0 | 3253 | 82 | |
| 13. | Panasonic S5 | Full Frame | 24.0 | 6000 | 4000 | 4K/60p | 25.1 | 14.5 | 2697 | 94 | |
| 14. | Pentax K-3 | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.7 | 13.4 | 1216 | 80 | |
| 15. | Pentax K-3 II | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.6 | 13.6 | 1106 | 80 | |
| 16. | Pentax K-70 | APS-C | 24.0 | 6000 | 4000 | 1080/60i | 23.8 | 13.1 | 1639 | 80 | |
| 17. | Pentax KP | APS-C | 24.1 | 6016 | 4000 | 1080/60i | 23.9 | 13.2 | 1699 | 81 | |
| 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 K-3 III indeed provides for movie recording, while the 1D Mark III does not. The highest resolution format that the K-3 III can use is 4K/30p.
Feature comparison
Apart from body and sensor, cameras can and do differ across a variety of features. The 1D Mark III and the K-3 III are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the K-3 III has a higher magnification than the one of the 1D Mark III (0.70x vs 0.58x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Canon 1D Mark III and Pentax K-3 III along with similar information for a selection of comparators.

| 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 1D Mark III | optical | Y | 3.0 / 230 | fixed | n | 1/8000s | 10.0/s | n | n | |
| 2. | Pentax K-3 III | optical | Y | 3.2 / 1620 | fixed | Y | 1/8000s | 12.0/s | n | Y | |
| 3. | Canon 1D Mark II | optical | Y | 2.0 / 230 | fixed | n | 1/8000s | 8.3/s | n | n | |
| 4. | Canon 1D Mark IV | optical | Y | 3.0 / 920 | fixed | n | 1/8000s | 10.0/s | n | n | |
| 5. | Canon 1Ds | optical | Y | 2.0 / 120 | fixed | n | 1/8000s | 3.0/s | n | n | |
| 6. | Canon 1Ds Mark III | optical | Y | 3.0 / 230 | fixed | n | 1/8000s | 5.0/s | n | n | |
| 7. | Canon 5D Mark II | optical | Y | 3.0 / 920 | fixed | n | 1/8000s | 3.9/s | n | n | |
| 8. | Canon 5D Mark III | optical | Y | 3.2 / 1040 | fixed | n | 1/8000s | 6.0/s | n | n | |
| 9. | Canon 5DS R | optical | Y | 3.2 / 1040 | fixed | n | 1/8000s | 5.0/s | n | n | |
| 10. | Nikon D2Xs | optical | Y | 2.5 / 230 | fixed | n | 1/8000s | 5.0/s | n | n | |
| 11. | Nikon D3 | optical | Y | 3.0 / 922 | fixed | n | 1/8000s | 11.0/s | n | n | |
| 12. | Nikon D3S | optical | Y | 3.0 / 921 | fixed | n | 1/8000s | 11.0/s | n | n | |
| 13. | Panasonic S5 | 2360 | n | 3.0 / 1840 | swivel | Y | 1/8000s | 7.0/s | n | Y | |
| 14. | Pentax K-3 | optical | Y | 3.2 / 1037 | fixed | n | 1/8000s | 8.3/s | Y | Y | |
| 15. | Pentax K-3 II | optical | Y | 3.2 / 1037 | fixed | n | 1/8000s | 8.3/s | n | Y | |
| 16. | Pentax K-70 | optical | n | 3.0 / 921 | swivel | n | 1/6000s | 6.0/s | Y | Y | |
| 17. | Pentax KP | optical | n | 3.0 / 921 | tilting | n | 1/6000s | 7.0/s | Y | Y | |
| Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one. | |||||||||||
One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The K-3 III has a touchscreen, while the 1D Mark III has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.
The Pentax K-3 III 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 1D Mark III writes its imaging data to Compact Flash or SDHC cards, while the K-3 III uses SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. The K-3 III supports UHS-II cards on its first slot and UHS-I on its second one, while the 1D Mark III cannot take advantage of Ultra High Speed SD cards.
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-1D Mark III and Pentax K-3 III 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. | Canon 1D Mark III | Y | - / - | - | - | - | 2.0 | - | - | - | |
| 2. | Pentax K-3 III | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 3. | Canon 1D Mark II | Y | - / - | - | - | - | 1.1 | - | - | - | |
| 4. | Canon 1D Mark IV | Y | stereo / - | Y | - | mini | 2.0 | - | - | - | |
| 5. | Canon 1Ds | Y | - / - | - | - | - | FW | - | - | - | |
| 6. | Canon 1Ds Mark III | Y | mono / - | - | - | - | 2.0 | - | - | - | |
| 7. | Canon 5D Mark II | Y | mono / mono | Y | - | mini | 2.0 | - | - | - | |
| 8. | Canon 5D Mark III | Y | mono / mono | Y | Y | mini | 2.0 | - | - | - | |
| 9. | Canon 5DS R | Y | mono / mono | Y | - | mini | 3.0 | - | - | - | |
| 10. | Nikon D2Xs | Y | - / - | - | - | - | 2.0 | - | - | - | |
| 11. | Nikon D3 | Y | - / - | - | - | mini | 2.0 | - | - | - | |
| 12. | Nikon D3S | Y | stereo / - | - | - | mini | 2.0 | - | - | - | |
| 13. | Panasonic S5 | Y | stereo / mono | Y | Y | micro | 3.2 | Y | - | Y | |
| 14. | Pentax K-3 | Y | mono / mono | Y | Y | mini | 3.0 | - | - | - | |
| 15. | Pentax K-3 II | Y | mono / mono | Y | Y | mini | 3.0 | - | - | - | |
| 16. | Pentax K-70 | Y | stereo / mono | Y | - | mini | 2.0 | Y | - | - | |
| 17. | Pentax KP | Y | stereo / mono | Y | - | - | 2.0 | Y | - | - |
It is notable that the K-3 III offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the 1D Mark III 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 the K-3 III has an internal geolocalization sensor and can record GPS coordinates in its EXIF data.
The K-3 III is a recent model that features in the current product line-up of Pentax. In contrast, the 1D Mark III has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the 1D Mark III was succeeded by the Canon 1D Mark IV. Further information on the features and operation of the 1D Mark III and K-3 III can be found, respectively, in the Canon 1D Mark III Manual (free pdf) or the online Pentax K-3 III Manual.
Review summary
So what conclusions can be drawn? Is the Canon 1D Mark III better than the Pentax K-3 III or vice versa? The listing below highlights the relative strengths of the two models.

Advantages of the Canon EOS-1D Mark III:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- More portrait friendly: Features an integrated vertical grip for easier portrait shooting.
- Longer lasting: Can take more shots (2200 versus 800) on a single battery charge.
- More heavily discounted: Has been available for much longer (launched in February 2007).

Arguments in favor of the Pentax K-3 III:
- More detail: Has more megapixels (25.6 vs 10.1MP), which boosts linear resolution by 59%.
- 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.
- Broader imaging potential: Can capture not only stills but also 4K/30p video.
- Larger viewfinder image: Features a viewfinder with a higher magnification (0.70x vs 0.58x).
- 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 (1620k vs 230k dots).
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Faster burst: Shoots at higher frequency (12 vs 10 flaps/sec) to capture the decisive moment.
- Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
- More compact: Is smaller (135x104mm vs 156x157mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 335g or 29 percent) and is thus easier to take along.
- 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.
- Faster data transfer: Supports a more advanced USB protocol (3.2 vs 2.0).
- Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
- Easier wireless transfer: Supports Bluetooth for image sharing without cables.
- Faster buffer clearing: Supports Ultra High Speed (UHS-II and UHS-I) SDXC cards.
- More affordable: Was introduced into a lower priced category (56 percent cheaper at launch).
- More modern: Reflects 14 years and 1 month of technical progress since the 1D Mark III launch.
If the number of relative strengths (bullet points above) is taken as a guide, the K-3 III is the clear winner of the contest (20 : 4 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 Canon 1D Mark III and the Pentax K-3 III 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 says little about, for example, the shooting experience and imaging performance of the 1D Mark III and the K-3 III in practical situations. 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 expert reviews 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.

| Camera Model |
AP score |
CL score |
DCW score |
DPR score |
EPZ score |
PB score |
Camera Launch |
Launch Price |
Street Price |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Canon 1D Mark III | .. | .. | .. | .. | .. | .. | Feb 2007 | US$ 4 499 | ebay.com | |
| 2. | Pentax K-3 III | 4/5 | .. | 3/5 | .. | 4.5/5 | .. | Mar 2021 | US$ 1 999 | amazon.com | |
| 3. | Canon 1D Mark II | .. | .. | .. | + + | .. | .. | Jan 2004 | US$ 4 499 | ebay.com | |
| 4. | Canon 1D Mark IV | 5/5 | .. | .. | 89/100 | .. | .. | Oct 2009 | US$ 4 999 | ebay.com | |
| 5. | Canon 1Ds | .. | .. | .. | + + | .. | .. | Sep 2002 | US$ 8 999 | ebay.com | |
| 6. | Canon 1Ds Mark III | .. | .. | .. | + + | 4.5/5 | .. | Aug 2007 | US$ 7 999 | ebay.com | |
| 7. | Canon 5D Mark II | 4/5 | 91/100 | .. | 79/100 | 4/5 | .. | Sep 2008 | US$ 3 499 | ebay.com | |
| 8. | Canon 5D Mark III | .. | + + | .. | 82/100 | 4.5/5 | 4.5/5 | Mar 2012 | US$ 3 499 | ebay.com | |
| 9. | Canon 5DS R | 5/5 | + | .. | 83/100 | 5/5 | 4.5/5 | Feb 2015 | US$ 3 699 | ebay.com | |
| 10. | Nikon D2Xs | .. | .. | .. | .. | .. | .. | Jun 2006 | US$ 4 699 | ebay.com | |
| 11. | Nikon D3 | .. | .. | .. | + + | 5/5 | 4.5/5 | Aug 2007 | US$ 4 999 | ebay.com | |
| 12. | Nikon D3S | 5/5 | .. | .. | 89/100 | 4.5/5 | 5/5 | Oct 2009 | US$ 5 199 | ebay.com | |
| 13. | Panasonic S5 | 4.5/5 | + + | 4.5/5 | 88/100 | 4.5/5 | 4.5/5 | Sep 2020 | US$ 1 999 | amazon.com | |
| 14. | Pentax K-3 | 4/5 | .. | .. | 83/100 | 5/5 | 5/5 | Oct 2013 | US$ 1 299 | ebay.com | |
| 15. | Pentax K-3 II | 4.5/5 | .. | .. | .. | 5/5 | 5/5 | Apr 2015 | US$ 1 099 | ebay.com | |
| 16. | Pentax K-70 | 4.5/5 | .. | 4/5 | 79/100 | 4.5/5 | 4.5/5 | Jun 2016 | US$ 649 | ebay.com | |
| 17. | Pentax KP | 4/5 | .. | 3/5 | 82/100 | 5/5 | 4.5/5 | Jan 2017 | US$ 1 099 | ebay.com | |
| Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available. | |||||||||||
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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, please note that some of the review sites have changed their methodology and reporting over time.

Check 1D Mark III offers at
ebay.com

Check K-3 III price at
amazon.com
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 use the search menu below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.
- Canon 1D Mark II vs Canon 1D Mark III
- Canon 1D Mark III vs Nikon D3300
- Canon 1D Mark III vs Nikon D3400
- Canon 1D Mark III vs Panasonic LX15
- Canon 1D Mark III vs Pentax KP
- Canon 1D Mark III vs Ricoh GR IIIx
- Canon 1Ds Mark III vs Pentax K-3 III
- Canon 5DS R vs Pentax K-3 III
- Canon M6 vs Pentax K-3 III
- Fujifilm X-T3 vs Pentax K-3 III
- Nikon Df vs Pentax K-3 III
- Panasonic TZ200 vs Pentax K-3 III
Specifications: Canon 1D Mark III 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 Model | Canon 1D Mark III | Pentax K-3 III |
|---|---|---|
| Camera Type | Digital single lens reflex | Digital single lens reflex |
| Camera Lens | Canon EF mount lenses | Pentax K mount lenses |
| Launch Date | February 2007 | March 2021 |
| Launch Price | USD 4,499 | USD 1,999 |
| Sensor Specs | Canon 1D Mark III | Pentax K-3 III |
| Sensor Technology | CMOS | CMOS |
| Sensor Format | APS-H Sensor | APS-C Sensor |
| Sensor Size | 28.1 x 18.7 mm | 23.3 x 15.5 mm |
| Sensor Area | 525.47 mm2 | 361.15 mm2 |
| Sensor Diagonal | 33.8 mm | 28 mm |
| Crop Factor | 1.3x | 1.5x |
| Sensor Resolution | 10.1 Megapixels | 25.6 Megapixels |
| Image Resolution | 3888 x 2592 pixels | 6192 x 4128 pixels |
| Pixel Pitch | 7.21 μm | 3.76 μm |
| Pixel Density | 1.92 MP/cm2 | 7.08 MP/cm2 |
| Moiré control | Anti-Alias filter | no AA filter |
| Movie Capability | no Video | 4K/30p Video |
| ISO Setting | 100 - 3,200 ISO | 100 - 160,000 ISO |
| ISO Boost | 50 - 6,400 ISO | no Enhancement |
| Image Processor | DIGIC III | PRIME V |
| DXO Sensor Quality (score) | 71 | .. |
| DXO Color Depth (bits) | 22.7 | .. |
| DXO Dynamic Range (EV) | 11.7 | .. |
| DXO Low Light (ISO) | 1078 | .. |
| Screen Specs | Canon 1D Mark III | Pentax K-3 III |
| Viewfinder Type | Optical viewfinder | Optical viewfinder |
| Viewfinder Field of View | 100% | 100% |
| Viewfinder Magnification | 0.58x | 0.70x |
| Top-Level Screen | Control Panel | Control Panel |
| LCD Framing | Live View | Live View |
| Rear LCD Size | 3.0inch | 3.2inch |
| LCD Resolution | 230k dots | 1620k dots |
| LCD Attachment | Fixed screen | Fixed screen |
| Touch Input | no Touchscreen | Touchscreen |
| Shooting Specs | Canon 1D Mark III | Pentax K-3 III |
| Focus System | Phase-detect AF | Phase-detect AF |
| Manual Focusing Aid | no Peaking Feature | Focus Peaking |
| Max Shutter Speed (mechanical) | 1/8000s | 1/8000s |
| Continuous Shooting | 10 shutter flaps/s | 12 shutter flaps/s |
| Shutter Life Expectancy | 300 000 actuations | 200 000 actuations |
| Time-Lapse Photography | no Intervalometer | Intervalometer built-in |
| Image Stabilization | Lens stabilization only | In-body stabilization |
| Fill Flash | no On-Board Flash | no On-Board Flash |
| Storage Medium | CF or SDHC cards | SDXC cards |
| Single or Dual Card Slots | Dual card slots | Dual card slots |
| UHS card support | no | Single UHS-II |
| Connectivity Specs | Canon 1D Mark III | Pentax K-3 III |
| External Flash | Hotshoe | Hotshoe |
| Studio Flash | PC Sync socket | PC Sync socket |
| USB Connector | USB 2.0 | USB 3.2 |
| HDMI Port | no HDMI | micro HDMI |
| Microphone Port | no MIC socket | External MIC port |
| Headphone Socket | no Headphone port | Headphone port |
| Wifi Support | no Wifi | Wifi built-in |
| Bluetooth Support | no Bluetooth | Bluetooth built-in |
| Geotagging | no internal GPS | GPS built-in |
| Body Specs | Canon 1D Mark III | Pentax K-3 III |
| Environmental Sealing | Weathersealed body | Weathersealed body |
| Battery Type | Canon LP-E4 | Pentax D-LI90 |
| Battery Life (CIPA) | 2200 shots per charge | 800 shots per charge |
| Body Dimensions |
156 x 157 x 80 mm (6.1 x 6.2 x 3.1 in) |
135 x 104 x 74 mm (5.3 x 4.1 x 2.9 in) |
| Camera Weight | 1155 g (40.7 oz) | 820 g (28.9 oz) |

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