What is the pixel pitch of the Pentax 645Z?
The Pentax 645Z provides 51.1 megapixels from a medium format sensor. This pixel density gives rise to a size of the individual pixel of 5.30µm.
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 645Z measures 43.8mm in width and 32.8mm in height, so that the total imaging area of the sensor amounts to 1 437 mm2. Moreover, the 645Z has 8 256 horizontal pixels and 6 192 vertical pixels, for a total of 51.1 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 (1 437 mm2) to the MP count (51 121 152).
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 645Z 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 645Z | Medium Format | 51.1 | 8256 | 6192 | 1080/60i | 26.0 | 14.7 | 4505 | 101 | |
2. | Canon 1D X Mark II | Full Frame | 20.0 | 5472 | 3648 | 4K/60p | 24.1 | 13.5 | 3207 | 88 | |
3. | Canon 5DS | Full Frame | 50.3 | 8688 | 5792 | 1080/30p | 24.7 | 12.4 | 2381 | 87 | |
4. | Canon 5DS R | Full Frame | 50.3 | 8688 | 5792 | 1080/30p | 24.6 | 12.4 | 2308 | 86 | |
5. | Hasselblad X1D | Medium Format | 51.3 | 8272 | 6200 | 1080/25p | 26.2 | 14.8 | 4489 | 102 | |
6. | Leica M11 | Full Frame | 60.3 | 9528 | 6328 | none | 26.3 | 14.8 | 3376 | 100 | |
7. | Leica SL | Full Frame | 24.0 | 6000 | 4000 | 4K/30p | 25.0 | 13.4 | 1821 | 88 | |
8. | Nikon D4S | Full Frame | 16.2 | 4928 | 3280 | 1080/60p | 24.4 | 13.3 | 3074 | 89 | |
9. | Nikon D5 | Full Frame | 20.7 | 5588 | 3712 | 4K/30p | 25.1 | 12.3 | 2343 | 88 | |
10. | Nikon D7200 | APS-C | 24.0 | 6000 | 4000 | 1080/60p | 24.5 | 14.6 | 1333 | 87 | |
11. | Pentax 645D | Medium Format | 39.5 | 7264 | 5440 | none | 24.6 | 12.6 | 1262 | 82 |
Further information on the sensor in the Pentax 645Z and the camera's operation can be found in the camera manual.
In the United States, the 645Z was initially launched in April 2014 at a price of $8,499.
Camera to camera comparisons
In case you are interested in seeing how this camera compares to another one, just make your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.
- Canon 10D vs Pentax 645Z
- Fujifilm X100S vs Pentax 645Z
- Fujifilm XQ2 vs Pentax 645Z
- Leica D-LUX Typ 109 vs Pentax 645Z
- Nikon D40X vs Nikon Z6
- Nikon D5300 vs Pentax 645Z
- Nikon Z30 vs Nikon Z6
- Nikon Z6 vs Olympus E-M1 III
- Nikon Z6 vs Panasonic GF7
- Nikon Z6 vs Panasonic GH5s
- Nikon Z6 vs Sigma fp
- Pentax 645Z vs Sony RX100 V
Camera Model | Pentax 645Z | |
---|---|---|
Camera Type | Digital single lens reflex | |
Camera Lens | Pentax 645 mount lenses | |
Launch Date | April 2014 | |
Launch Price | USD 8 499 | |
Sensor Specs | ||
Sensor Technology | CMOS | |
Sensor Format | Medium Format Sensor | |
Sensor Size | 43.8 x 32.8 mm | |
Sensor Area | 1 437 mm2 | |
Sensor Diagonal | 54.7 mm | |
Crop Factor | 0.79x | |
Sensor Resolution | 51.1 Megapixels | |
Image Resolution | 8 256 x 6 192 pixels | |
Pixel Pitch | 5.30 μm | |
Pixel Density | 3.56 MP/cm2 | |
Moiré control | no AA filter | |
Movie Capability | 1080/60i Video | |
ISO Setting | 100 - 204 800 ISO | |
Image Processor | PRIME III | |
DXO Sensor Quality (score) | 101 | |
DXO Color Depth (bits) | 26.0 | |
DXO Dynamic Range (EV) | 14.7 | |
DXO Low Light (ISO) | 4505 | |
Screen Specs | ||
Viewfinder Type | Optical viewfinder | |
Viewfinder Field of View | 98% | |
Viewfinder Magnification | 0.78x | |
Top-Level Screen | Control Panel | |
LCD Framing | Live View | |
LCD Size | 3.2 inch | |
LCD Resolution | 1037k dots | |
LCD Attachment | Tilting screen | |
V-logging Friendliness | No front-flip | |
Touch Input | No touchscreen | |
Shooting Specs | ||
Focus System | Phase-detect AF | |
Manual Focusing Aid | Focus Peaking | |
Maximum Shutter Speed | 1/4000s | |
Continuous Shooting | 3 shutter flaps/s | |
Shutter Life Expectancy | 100 000 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 | UHS-I | |
Connectivity Specs | ||
External Flash | Hotshoe | |
Studio Flash | PC Sync socket | |
USB Connector | USB 3.0 | |
HDMI Port | mini HDMI | |
Microphone Port | External MIC port | |
Wifi Support | no Wifi | |
Body Specs | ||
Environmental Sealing | Weathersealed body | |
Battery Type | Pentax D-LI90 power pack | |
Battery Life (CIPA) | 650 shots per charge | |
Body Dimensions |
156 x 117 x 123 mm (6.1 x 4.6 x 4.8 in) |
|
Camera Weight | 1 550 g (54.7 oz) |
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