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What is the crop factor of the Pentax K-5?

The Pentax K-5 is equipped with an APS-C sensor, whose diagonal measures 28.4mm. The sensor has a crop factor (or format factor, or focal length multiplier) of 1.5.

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 1.5, the sensor in the Pentax K-5 is smaller than the receptor area of a 35mm film slide or negative. As a result, a lens that is attached to the Pentax K-5 will offer a narrower angle of view and provide deeper 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 33mm lens on the Pentax K-5 will provide the same angle of view and depth of field as a 50mm normal lens on a film camera (33mm * 1.5 = 50mm).

Pentax K-5 and Credit Card sensor measures
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Sensor specs and performance

The table below compares the sensor specs of the Pentax K-5 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 K-5 APS-C 16.1 4928 32641080/25p23.714.1116282
2.
 
Nikon D7000 APS-C 16.1 4928 32641080/24p23.513.9116780
3.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
4.
 
Pentax K-70 APS-C 24.0 6000 40001080/60i23.813.1163980
5.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
6.
 
Pentax K-50 APS-C 16.1 4928 32641080/30p23.713.0112079
7.
 
Pentax K-500 APS-C 16.1 4928 32641080/30p23.713.1108779
8.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
9.
 
Pentax K-30 APS-C 16.1 4928 32641080/30p23.713.0112979
10.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
11.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178
Note: DXO values in italics represent estimates based on sensor size and age.
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Further information on the sensor in the Pentax K-5 and the camera's operation can be found in the camera manual.

In the United States, the K-5 was initially launched in September 2010 at a price of $1,099.

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Camera to camera comparisons

If you would like to see a side-by-side review with another camera, just make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications Summary
    Camera Model Pentax K-5
    Camera Type Digital single lens reflex
    Camera Lens Pentax K mount lenses
    Launch Date September 2010
    Launch Price USD 1 099
    Sensor Specs
    Sensor Technology CMOS
    Sensor Format APS-C Sensor
    Sensor Size 23.7 x 15.7 mm
    Sensor Area 372 mm2
    Sensor Diagonal 28.4 mm
    Crop Factor 1.5x
    Sensor Resolution 16.1 Megapixels
    Image Resolution 4 928 x 3 264 pixels
    Pixel Pitch 4.81 μm
    Pixel Density 4.32 MP/cm2
    Moiré control Anti-Alias filter
    Movie Capability 1080/25p Video
    ISO Setting 100 - 12 800 ISO
    ISO Boost 80 - 51 200 ISO
    Image Processor PRIME II
    DXO Sensor Quality (score) 82
    DXO Color Depth (bits) 23.7
    DXO Dynamic Range (EV) 14.1
    DXO Low Light (ISO) 1162
    Screen Specs
    Viewfinder Type Optical viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.61x
    Top-Level Screen Control Panel
    LCD Framing Live View
    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 1/8000s
    Continuous Shooting 7 shutter flaps/s
    Shutter Life Expectancy100 000 actuations
    Silent Shootingno E-Shutter
    Time Lapse PhotographyIntervalometer Built-in
    Image StabilizationIn-body stabilization
    Fill Flash Built-in Flash
    Storage Medium SDXC cards
    Single or Dual Card Slots Single card slot
    UHS card support no
    Connectivity Specs
    External Flash Hotshoe
    Studio Flash PC Sync socket
    USB Connector USB 2.0
    HDMI Port mini HDMI
    Microphone Port External MIC port
    Wifi Support no Wifi
    Body Specs
    Environmental SealingWeathersealed body
    Battery Type Pentax D-LI90 power pack
    Battery Life (CIPA)740 shots per charge
    Body Dimensions 131 x 97 x 73 mm
    (5.2 x 3.8 x 2.9 in)
    Camera Weight 760 g (26.8 oz)

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