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What is the crop factor of the Pentax 645D?

The Pentax 645D is equipped with a medium format sensor, whose diagonal measures 55mm. The sensor has a crop factor (or format factor, or focal length multiplier) of 0.79.

The crop factor is defined as the ratio of the 35mm full-frame film diagonal to the diagonal of a digital sensor. This number indicates how a lens behaves in relation to the size of the image sensor.

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Sensor size comparison with a film slide

With a crop factor of 0.79, the sensor in the Pentax 645D is larger than the receptor area of a 35mm film slide or negative. As a result, a lens that is attached to the Pentax 645D will offer a wider angle of view and provide shallower depth of field than a lens of similar focal length and aperture on a film camera. The equivalent focal length is obtained by multiplying the actual focal length of the lens with the crop factor. For example, a 63mm lens on the Pentax 645D will provide the same angle of view and depth of field as a 50mm normal lens on a film camera (63mm * 0.79 = 50mm).

Pentax 645D and Credit Card sensor measures
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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.

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Sensor Characteristics
#   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.
 
Canon 1D X Mark II Full Frame 20.0 5472 36484K/60p24.113.5320788
3.
 
Canon 1D X Full Frame 17.9 5184 34561080/30p23.811.8278682
4.
 
Canon 1D Mark IV APS-H 16.0 4896 32641080/30p22.812.0132074
5.
 
Leica S Typ 006 Medium Format 37.5 7500 5000none23.912.282476
6.
 
Nikon D850 Full Frame 45.4 8256 55044K/30p26.414.82660100
7.
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.3234388
8.
 
Nikon D810 Full Frame 36.2 7360 49121080/60p25.714.8285397
9.
 
Nikon D3S Full Frame 12.1 4256 2832720/24p23.512.0325382
10.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
11.
 
Sony A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
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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.

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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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    Specifications Summary
    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 Aidno Peaking Feature
    Maximum Shutter Speed 1/4000s
    Continuous Shooting 1.1 shutter flaps/s
    Shutter Life Expectancy50 000 actuations
    Silent Shootingno E-Shutter
    Time Lapse PhotographyIntervalometer 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 SealingWeathersealed body
    Battery Type 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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