A potelyt.com – Photography & Imaging Resources
quick link 1 quick link 2
quick link 3
quick link 4
ad

When you use links on apotelyt.com to buy products,
the site may earn a commission.

PW

Pentax 645D vs K-3 III

The Pentax 645D and the Pentax K-3 III are two digital cameras that were officially introduced, respectively, in March 2010 and March 2021. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a medium format (645D) and an APS-C (K-3 III) sensor. The 645D has a resolution of 39.5 megapixels, whereas the K-3 III 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
Pentax 645D
versus
Pentax K-3 III
Pentax 645D   Pentax K-3 III
Digital single lens reflex Digital single lens reflex
Pentax 645 mount lenses Pentax K mount lenses
39.5 MP – Medium Format sensor 25.6 MP – APS-C sensor
no Video 4K/30p Video
ISO 100-1,600 ISO 100-160,000
Optical viewfinder Optical viewfinder
3.0" LCD – 921k dots 3.2" LCD – 1620k dots
Fixed screen (not touch-sensitive) Fixed touchscreen
1.1 shutter flaps per second 12 shutter flaps per second
Lens stabilization onlyIn-body stabilization
Weathersealed bodyWeathersealed body
800 shots per battery charge800 shots per battery charge
156 x 117 x 119 mm, 1480 g 135 x 104 x 74 mm, 820 g
logo
Check 645D offers at
ebay.com
logo
Check K-3 III price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645D 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.

ad

Body comparison

An illustration of the physical size and weight of the Pentax 645D 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 width, height and depth dimensions are rounded to the nearest millimeter.

The K-3 III can be obtained in two different colors (black, silver), while the 645D is only available in black.

Size Pentax 645D vs Pentax K-3 III
Compare 645D versus K-3 III top
Comparison 645D 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 smaller (23 percent) than the Pentax 645D. Moreover, the K-3 III is substantially lighter (45 percent) than the 645D. 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.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

scroll hint
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 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 US$ 9 995ebay.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 IV 156 mm 157 mm 80 mm 1230 g 1500 Y Oct 2009 US$ 4 999ebay.com
4.
 
Canon 1D X 158 mm 168 mm 83 mm 1551 g 1120 Y Oct 2011 US$ 6 799ebay.com
5.
 
Canon 1D X Mark II 158 mm 168 mm 83 mm 1530 g 1210 Y Feb 2016 US$ 5 999ebay.com
6.
 
Fujifilm X-H1 140 mm 97 mm 86 mm 673 g 310 Y Feb 2018 US$ 1 899ebay.com
7.
 
Leica S Typ 006 160 mm 120 mm 80 mm 1260 g .. Y Sep 2012 US$ 21 949ebay.com
8.
 
Nikon D3S 160 mm 157 mm 88 mm 1240 g 4200 Y Oct 2009 US$ 5 199ebay.com
9.
 
Nikon D5 160 mm 159 mm 92 mm 1415 g 3780 Y Jan 2016 US$ 6 499ebay.com
10.
 
Nikon D810 146 mm 123 mm 82 mm 980 g 1200 Y Jun 2014 US$ 3 299ebay.com
11.
 
Nikon D850 146 mm 124 mm 79 mm 1005 g 1840 Y Jul 2017 US$ 3 299 amazon.com
12.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 US$ 8 499ebay.com
13.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 US$ 1 299ebay.com
14.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 US$ 1 099ebay.com
15.
 
Pentax K-70 126 mm 93 mm 74 mm 688 g 410 Y Jun 2016 US$ 649ebay.com
16.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 US$ 1 099ebay.com
17.
 
Sony A7R 127 mm 94 mm 48 mm 465 g 340 Y Oct 2013 US$ 2 299ebay.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 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 80 percent) than the 645D, 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. 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 Pentax 645D features a medium format sensor and the Pentax K-3 III an APS-C sensor. The sensor area in the K-3 III is 75 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.5. The sensor in the 645D has a native 4:3 aspect ratio, while the one in the K-3 III offers a 3:2 aspect.

Technology-wise, the K-3 III uses a more advanced image processing engine (PRIME V) than the 645D (PRIME II), with benefits for noise reduction, color accuracy, and processing speed.

Pentax 645D and Pentax K-3 III sensor measures

With 39.5MP, the 645D offers a higher resolution than the K-3 III (25.6MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 3.76μm for the K-3 III) due to its larger sensor. However, the K-3 III is a much more recent model (by 11 years) than the 645D, and its sensor will 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 neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Pentax 645D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645D for good quality output (200 dots per inch) amounts to 36.3 x 27.2 inches or 92.3 x 69.1 cm, for very good quality (250 dpi) 29.1 x 21.8 inches or 73.8 x 55.3 cm, and for excellent quality (300 dpi) 24.2 x 18.1 inches or 61.5 x 46.1 cm. The corresponding values for the Pentax K-3 III are 31 x 20.6 inches or 78.6 x 52.4 cm for good quality, 24.8 x 16.5 inches or 62.9 x 41.9 cm for very good quality, and 20.6 x 13.8 inches or 52.4 x 35 cm for excellent quality prints.

Unlike the 645D, 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 Pentax 645D has a native sensitivity range from ISO 100 to ISO 1600. The corresponding ISO settings for the Pentax K-3 III are ISO 100 to ISO 160000 (no boost).

In terms of underlying technology, the 645D is build around a CCD sensor, while the K-3 III uses a CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

645D versus K-3 III MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.

scroll hint
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 645D Medium Format 39.5 7264 5440none24.612.6126282
2.
 
Pentax K-3 III APS-C 25.6 6192 41284K/30p24.213.7208385
3.
 
Canon 1D Mark IV APS-H 16.0 4896 32641080/30p22.812.0132074
4.
 
Canon 1D X Full Frame 17.9 5184 34561080/30p23.811.8278682
5.
 
Canon 1D X Mark II Full Frame 20.0 5472 36484K/60p24.113.5320788
6.
 
Fujifilm X-H1 APS-C 24.0 6000 40004K/30p24.013.3180682
7.
 
Leica S Typ 006 Medium Format 37.5 7500 5000none23.912.282476
8.
 
Nikon D3S Full Frame 12.1 4256 2832720/24p23.512.0325382
9.
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.3234388
10.
 
Nikon D810 Full Frame 36.2 7360 49121080/60p25.714.8285397
11.
 
Nikon D850 Full Frame 45.4 8256 55044K/30p26.414.82660100
12.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
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 A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
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 can also record movies. The K-3 III indeed provides for movie recording, while the 645D 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 range of features. The 645D 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 viewfinder in the K-3 III offers a wider field of view (100%) than the one in the 645D (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the 645D has a higher magnification (0.78x vs 0.70x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Pentax 645D, the Pentax K-3 III, and comparable cameras.

scroll hint
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 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
2.
 
Pentax K-3 IIIoptical Y3.2 / 1620 fixed Y 1/8000s 12.0/s n Y
3.
 
Canon 1D Mark IVoptical Y3.0 / 920 fixed n 1/8000s 10.0/s n n
4.
 
Canon 1D Xoptical Y3.2 / 1040 fixed n 1/8000s 14.0/s n n
5.
 
Canon 1D X Mark IIoptical Y3.2 / 1620 fixed Y 1/8000s 16.0/s n n
6.
 
Fujifilm X-H13690 Y3.0 / 1040 full-flex Y 1/8000s 14.0/s n Y
7.
 
Leica S Typ 006optical Y3.0 / 922 fixed n 1/4000s 1.5/s n n
8.
 
Nikon D3Soptical Y3.0 / 921 fixed n 1/8000s 11.0/s n n
9.
 
Nikon D5optical Y3.2 / 2359 fixed Y 1/8000s 14.0/s n n
10.
 
Nikon D810optical Y3.2 / 1229 fixed n 1/8000s 5.0/s Y n
11.
 
Nikon D850optical Y3.2 / 2359 tilting Y 1/8000s 9.0/s n n
12.
 
Pentax 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
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 A7R2400 n3.0 / 1230 tilting n 1/8000s 4.0/s n n
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 645D has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

The Pentax 645D 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 645D and the K-3 III write their files to 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 645D 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 Pentax 645D and Pentax K-3 III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

scroll hint
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 645DYstereo / ----2.0---
2.
 
Pentax K-3 IIIYstereo / monoYYmicro3.2Y-Y
3.
 
Canon 1D Mark IVYstereo / -Y-mini2.0---
4.
 
Canon 1D XYmono / -Y-mini2.0---
5.
 
Canon 1D X Mark IIYmono / monoYYmini3.0---
6.
 
Fujifilm X-H1Ystereo / monoY-micro3.0Y--
7.
 
Leica S Typ 006Y- / ---mini2.0---
8.
 
Nikon D3SYstereo / ---mini2.0---
9.
 
Nikon D5Ystereo / monoYYmini3.0---
10.
 
Nikon D810Ystereo / monoYYmini3.0Y--
11.
 
Nikon D850Ystereo / monoYYmini3.0YYY
12.
 
Pentax 645ZYstereo / monoY-mini3.0---
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 A7RYstereo / monoYYmicro2.0YY-

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 645D 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 645D has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the 645D was succeeded by the Pentax 645Z. Further information on the features and operation of the 645D and K-3 III can be found, respectively, in the Pentax 645D Manual (free pdf) or the online Pentax K-3 III Manual.

Review summary

So what conclusions can be drawn? Is there a clear favorite between the Pentax 645D and the Pentax K-3 III? Which camera is better? The listing below highlights the relative strengths of the two models.


Arguments in favor of the Pentax 645D:

  • More detail: Offers more megapixels (39.5 vs 25.6MP) with a 22% higher linear resolution.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.78x vs 0.70x).
  • More heavily discounted: Has been available for much longer (launched in March 2010).


Reasons to prefer the Pentax K-3 III:

  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better jpgs: Has a more modern image processing engine (PRIME V vs PRIME II).
  • Broader imaging potential: Can capture not only stills but also 4K/30p video.
  • More complete view: Has a viewfinder with a larger field of view (100% vs 98%).
  • 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 921k dots).
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 1.1 flaps/sec) to capture the decisive moment.
  • More compact: Is smaller (135x104mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 660g or 45 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 (80 percent cheaper at launch).
  • More modern: Reflects 11 years of technical progress since the 645D launch.

If the count of relative strengths (bullet points above) is taken as a measure, the K-3 III is the clear winner of the contest (19 : 3 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.

645D 03:19 K-3 III

How about other alternatives? Do the specifications of the Pentax 645D 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 specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it says little about, for example, the shooting experience and imaging performance of the 645D 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 hands-on reviews by experts are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

scroll hint
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 645D5/5.......... Mar 2010 US$ 9 995ebay.com
2.
 
Pentax K-3 III4/5..3/5..4.5/5.. Mar 2021 US$ 1 999 amazon.com
3.
 
Canon 1D Mark IV5/5....89/100.... Oct 2009 US$ 4 999ebay.com
4.
 
Canon 1D X5/5......4.5/54.5/5 Oct 2011 US$ 6 799ebay.com
5.
 
Canon 1D X Mark II....4.5/589/1004.5/54.5/5 Feb 2016 US$ 5 999ebay.com
6.
 
Fujifilm X-H1..+5/586/1004.5/54.5/5 Feb 2018 US$ 1 899ebay.com
7.
 
Leica S Typ 006............ Sep 2012 US$ 21 949ebay.com
8.
 
Nikon D3S5/5....89/1004.5/55/5 Oct 2009 US$ 5 199ebay.com
9.
 
Nikon D5....4/589/1004.5/55/5 Jan 2016 US$ 6 499ebay.com
10.
 
Nikon D8105/5..5/586/1005/54.5/5 Jun 2014 US$ 3 299ebay.com
11.
 
Nikon D8504.5/5+ +5/589/1004.5/55/5 Jul 2017 US$ 3 299 amazon.com
12.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 US$ 8 499ebay.com
13.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 US$ 1 299ebay.com
14.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 US$ 1 099ebay.com
15.
 
Pentax K-704.5/5..4/579/1004.5/54.5/5 Jun 2016 US$ 649ebay.com
16.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 US$ 1 099ebay.com
17.
 
Sony A7R5/5+ +..82/1004.5/55/5 Oct 2013 US$ 2 299ebay.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 rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

logo
Check 645D offers at
ebay.com
logo
Check K-3 III price at
amazon.com

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. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

~
    loader
    ad

    Specifications: Pentax 645D 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 Pentax 645D Pentax K-3 III
    Camera Type Digital single lens reflex Digital single lens reflex
    Camera Lens Pentax 645 mount lenses Pentax K mount lenses
    Launch Date March 2010 March 2021
    Launch Price USD 9,995 USD 1,999
    Sensor Specs Pentax 645D Pentax K-3 III
    Sensor Technology CCD CMOS
    Sensor Format Medium Format Sensor APS-C Sensor
    Sensor Size 44.0 x 33.0 mm 23.3 x 15.5 mm
    Sensor Area 1452 mm2 361.15 mm2
    Sensor Diagonal 55 mm 28 mm
    Crop Factor 0.79x 1.5x
    Sensor Resolution 39.5 Megapixels 25.6 Megapixels
    Image Resolution 7264 x 5440 pixels 6192 x 4128 pixels
    Pixel Pitch 6.06 μm 3.76 μm
    Pixel Density 2.72 MP/cm2 7.08 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability no Video 4K/30p Video
    ISO Setting 100 - 1,600 ISO 100 - 160,000 ISO
    Image Processor PRIME II PRIME V
    DXO Sensor Quality (score) 82 ..
    DXO Color Depth (bits) 24.6 ..
    DXO Dynamic Range (EV) 12.6 ..
    DXO Low Light (ISO) 1262 ..
    Screen Specs Pentax 645D Pentax K-3 III
    Viewfinder Type Optical viewfinder Optical viewfinder
    Viewfinder Field of View 98% 100%
    Viewfinder Magnification 0.78x 0.70x
    Top-Level Screen Control Panel Control Panel
    LCD Framing Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 921k dots 1620k dots
    LCD Attachment Fixed screen Fixed screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax 645D Pentax K-3 III
    Focus System Phase-detect AF Phase-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 1.1 shutter flaps/s 12 shutter flaps/s
    Shutter Life Expectancy50 000 actuations200 000 actuations
    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 Dual card slots Dual card slots
    UHS card support no Single UHS-II
    Connectivity Specs Pentax 645D 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 Pentax 645D Pentax K-3 III
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Pentax D-LI90 Pentax D-LI90
    Battery Life (CIPA)800 shots per charge800 shots per charge
    Body Dimensions 156 x 117 x 119 mm
    (6.1 x 4.6 x 4.7 in)
    135 x 104 x 74 mm
    (5.3 x 4.1 x 2.9 in)
    Camera Weight 1480 g (52.2 oz) 820 g (28.9 oz)
    logo
    Check 645D offers at
    ebay.com
    logo
    Check K-3 III price at
    amazon.com

    Did you notice an error on this page? If so, please get in touch, so that we can correct the information.

    You are here Home  »  CAM-parator  »  Pentax 645D vs Pentax K-3 III