How many Megapixels does the Pentax 645D have?
The Pentax 645D is equipped with a a medium format sensor that offers an image resolution of 39.5 megapixels (MP), or 39.5 million pixels. With its native aspect ratio of 4:3, the sensor has 7 264 horizontal pixels and 5 440 vertical pixels.
A 35mm film slide or negative contains 5-15 MP of useful detail, so that the Pentax 645D can be considered to be a high-resolution camera that outresolves any 35mm film camera.
A high megapixel count makes it possible to crop any captured image substantially or to make very large prints from the image file. On the downside, large megapixel files are slower to transfer and take up more storage space on the computer harddisk. Also, high-resolution imaging requires sharper, more expensive lenses than low-res picture taking.
How large can I print with 39.5 MP?
The maximum print size of the Pentax 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. Few people actually print their images that large on a regular basis, but it is nice to have the option to make very large prints of exceptional shots. Also, as mentioned earlier, a key advantage of high-MP cameras is that it is possible to crop an image ex-post and thereby, for example, change the composition of the capture or zoom in on some detail.
Sensor specs and performance
The table below compares the sensor specs of the Pentax 645D to those of several similar cameras. In addition to sensor class and megapixel count, DXO values are reported as indicators of the sensor's imaging quality (higher is better). Three aspects are covered: color depth (DXO Portrait), dynamic range (DXO Landscape), and high-ISO noise (DXO Sports). Larger sensor cameras tend to outperform cameras of the same generation that are equipped with a smaller imager. On the other hand, larger sensors are more expensive and require bigger and heavier lenses than smaller light receptors.
|1.||Pentax 645D||Medium Format||39.5||7264||5440||none||24.6||12.6||1262||82|
|2.||Canon 1D X Mark II||Full Frame||20.0||5472||3648||4K/60p||24.1||13.5||3207||88|
|3.||Canon 1D X||Full Frame||17.9||5184||3456||1080/30p||23.8||11.8||2786||82|
|4.||Canon 1D Mark IV||APS-H||16.0||4896||3264||1080/30p||22.8||12.0||1320||74|
|5.||Leica S Typ 006||Medium Format||37.5||7500||5000||none||23.9||12.2||824||76|
|6.||Nikon D850||Full Frame||45.4||8256||5504||4K/30p||26.4||14.8||2660||100|
|7.||Nikon D5||Full Frame||20.7||5588||3712||4K/30p||25.1||12.3||2343||88|
|8.||Nikon D810||Full Frame||36.2||7360||4912||1080/60p||25.7||14.8||2853||97|
|9.||Nikon D3S||Full Frame||12.1||4256||2832||720/24p||23.5||12.0||3253||82|
|10.||Pentax 645Z||Medium Format||51.1||8256||6192||1080/60i||26.0||14.7||4505||101|
|11.||Sony A7R||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
In the United States, the 645D was initially launched in March 2010 at a price of $9,995.
Camera to camera comparisons
If you would like to see a side-by-side review with another camera, just make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.
|Camera Model||Pentax 645D|
|Camera Type||Digital single lens reflex|
|Camera Lens||Pentax 645 mount lenses|
|Launch Date||March 2010|
|Launch Price||USD 9 995|
|Sensor Format||Medium Format Sensor|
|Sensor Size||44.0 x 33.0 mm|
|Sensor Area||1 452 mm2|
|Sensor Diagonal||55 mm|
|Sensor Resolution||39.5 Megapixels|
|Image Resolution||7 264 x 5 440 pixels|
|Pixel Pitch||6.06 μm|
|Pixel Density||2.72 MP/cm2|
|Moiré control||no AA filter|
|Movie Capability||no Video|
|ISO Setting||100 - 1 600 ISO|
|Image Processor||PRIME II|
|DXO Sensor Quality (score)||82|
|DXO Color Depth (bits)||24.6|
|DXO Dynamic Range (EV)||12.6|
|DXO Low Light (ISO)||1262|
|Viewfinder Type||Optical viewfinder|
|Viewfinder Field of View||98%|
|Top-Level Screen||Control Panel|
|LCD Size||3.0 inch|
|LCD Resolution||921k dots|
|LCD Attachment||Fixed screen|
|Touch Input||No touchscreen|
|Focus System||Phase-detect AF|
|Manual Focusing Aid||no Peaking Feature|
|Maximum Shutter Speed||1/4000s|
|Continuous Shooting||1.1 shutter flaps/s|
|Shutter Life Expectancy||50 000 actuations|
|Silent Shooting||no E-Shutter|
|Time Lapse Photography||Intervalometer Built-in|
|Fill Flash||no On-Board Flash|
|Storage Medium||SDXC cards|
|Single or Dual Card Slots||Dual card slots|
|UHS card support||no|
|Studio Flash||PC Sync socket|
|USB Connector||USB 2.0|
|HDMI Port||no HDMI|
|Wifi Support||no Wifi|
|Environmental Sealing||Weathersealed body|
|Battery Type||D-LI90 power pack|
|Battery Life (CIPA)||800 shots per charge|
156 x 117 x 119 mm
(6.1 x 4.6 x 4.7 in)
|Camera Weight||1 480 g (52.2 oz)|
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