What is the pixel pitch of the Pentax 645D?
The Pentax 645D provides 39.5 megapixels from a medium format sensor. This pixel density gives rise to a size of the individual pixel of 6.06µm.
The pixel size or pixel pitch can be calculated by dividing the sensor area by the pixel count and then taking the square root. In particular, the sensor in the Pentax 645D measures 44.0mm in width and 33.0mm in height, so that the total imaging area of the sensor amounts to 1 452 mm2. Moreover, the 645D has 7 264 horizontal pixels and 5 440 vertical pixels, for a total of 39.5 megapixels. Then, the size (height or width) of each individual pixel can be calculated as the square root of the ratio of the sensor area (1 452 mm2) to the MP count (39 516 160).
Larger pixels provide advantages with respect to gathering light, particularly in low-light situations. Large pixels notably have a better signal to noise ratio, meaning that they can better differentiate between incoming photons and the noisy signals that the internal processes of the camera create. As a result, big pixels are particularly helpful to the photographer when shooting with high ISO settings.
Sensor specs and performance
The table below compares the sensor specs of the Pentax 645D to those of several similar cameras. The reported DXO values are indicators of the sensor's imaging quality (higher is better), covering 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.
# | 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 | 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 |
Further information on the sensor in the Pentax 645D and the camera's operation can be found in the camera manual.
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.
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- Canon 700D vs Pentax 645D
- Canon R vs Pentax 645D
- Fujifilm X100V vs Nikon Z6
- Nikon D7000 vs Nikon Z6
- Nikon Z6 vs Panasonic FZ82
- Nikon Z6 vs Panasonic GM1
- Nikon Z6 vs Samsung NX30
- Panasonic FZ100 vs Pentax 645D
- Pentax 645D vs Pentax K-3
- Pentax 645D vs Sony HX80
- Pentax 645D vs Sony NEX-3N
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 Specs | ||
Sensor Technology | CCD | |
Sensor Format | Medium Format Sensor | |
Sensor Size | 44.0 x 33.0 mm | |
Sensor Area | 1 452 mm2 | |
Sensor Diagonal | 55 mm | |
Crop Factor | 0.79x | |
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 | |
Screen Specs | ||
Viewfinder Type | Optical viewfinder | |
Viewfinder Field of View | 98% | |
Viewfinder Magnification | 0.78x | |
Top-Level Screen | Control Panel | |
LCD Size | 3.0 inch | |
LCD Resolution | 921k dots | |
LCD Attachment | Fixed screen | |
Touch Input | No touchscreen | |
Shooting Specs | ||
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 | |
Connectivity Specs | ||
External Flash | Hotshoe | |
Studio Flash | PC Sync socket | |
USB Connector | USB 2.0 | |
HDMI Port | no HDMI | |
Wifi Support | no Wifi | |
Body Specs | ||
Environmental Sealing | Weathersealed body | |
Battery Type | Pentax D-LI90 power pack | |
Battery Life (CIPA) | 800 shots per charge | |
Body Dimensions |
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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