Pentax K500 vs. Pentax K50
Comparison
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Pentax K500  Pentax K50  
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Megapixels
16.30
16.30
Max. image resolution
4928 x 3264
4928 x 3264
Sensor
Sensor type
CMOS
CMOS
Sensor size
23.7 x 15.7 mm
23.7 x 15.7 mm
Sensor size comparison
Sensor size is generally a good indicator of the quality of the camera.
Sensors can vary greatly in size. As a general rule, the bigger the
sensor, the better the image quality.
Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older.
Learn more about sensor sizes »
Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older.
Learn more about sensor sizes »
Actual sensor size
Note: Actual size is set to screen → change »

vs 

1  :  1 
(ratio)  
Pentax K500  Pentax K50 
Surface area:
372.09 mm²  vs  372.09 mm² 
Difference: 0 mm² (0%)
K500 and K50 sensors are the same size.
Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next. It tells you how close the pixels are to each other.
The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range.
The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range.
Pixel or photosite area affects how much light per pixel can be gathered.
The larger it is the more light can be collected by a single pixel.
Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size.
Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size.
Relative pixel sizes:
vs
Pixel area difference: 0 µm² (0%)
Pentax K500 and Pentax K50 have the same pixel area.
Pixel density tells you how many million pixels fit or would fit in one
square cm of the sensor.
Higher pixel density means smaller pixels and lower pixel density means larger pixels.
Higher pixel density means smaller pixels and lower pixel density means larger pixels.
To learn about the accuracy of these numbers,
click here.
Specs
Pentax K500
Pentax K50
Total megapixels
16.50
16.50
Effective megapixels
16.30
16.30
Optical zoom
Digital zoom
ISO sensitivity
Auto, 100  51200 (1, 1/2, 1/3 steps)
Auto, 100  51200 (1, 1/2, 1/3 steps)
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Metering
Multi, Centerweighted, Spot
Multi, Centerweighted, Spot
Exposure compensation
±5 EV (in 1/3 EV, 1/2 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
30 sec
30 sec
Max. shutter speed
1/6000 sec
1/6000 sec
Builtin flash
External flash
Viewfinder
Optical (pentaprism)
Optical (pentaprism)
White balance presets
9
9
Screen size
3"
3"
Screen resolution
921,000 dots
921,000 dots
Video capture
Max. video resolution
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
4 x AA batteries (optional LiIon DLI109)
LiIon DLI109
Weight
650 g
650 g
Dimensions
129.5 x 96.5 x 71 mm
129.5 x 96.5 x 71 mm
Year
2013
2013
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
Diagonal = √  w² + h² 
Pentax K500 diagonal
w = 23.70 mm
h = 15.70 mm
h = 15.70 mm
Diagonal = √  23.70² + 15.70²  = 28.43 mm 
Pentax K50 diagonal
w = 23.70 mm
h = 15.70 mm
h = 15.70 mm
Diagonal = √  23.70² + 15.70²  = 28.43 mm 
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
K500 sensor area
Width = 23.70 mm
Height = 15.70 mm
Surface area = 23.70 × 15.70 = 372.09 mm²
Height = 15.70 mm
Surface area = 23.70 × 15.70 = 372.09 mm²
K50 sensor area
Width = 23.70 mm
Height = 15.70 mm
Surface area = 23.70 × 15.70 = 372.09 mm²
Height = 15.70 mm
Surface area = 23.70 × 15.70 = 372.09 mm²
Pixel pitch
Pixel pitch is the distance from the center of one pixel to the center of the
next measured in micrometers (µm). It can be calculated with the following formula:
Pixel pitch =  sensor width in mm  × 1000 
sensor resolution width in pixels 
K500 pixel pitch
Sensor width = 23.70 mm
Sensor resolution width = 4962 pixels
Sensor resolution width = 4962 pixels
Pixel pitch =  23.70  × 1000  = 4.78 µm 
4962 
K50 pixel pitch
Sensor width = 23.70 mm
Sensor resolution width = 4962 pixels
Sensor resolution width = 4962 pixels
Pixel pitch =  23.70  × 1000  = 4.78 µm 
4962 
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
Pixel area =  sensor surface area in mm² 
effective megapixels 
K500 pixel area
Pixel pitch = 4.78 µm
Pixel area = 4.78² = 22.85 µm²
Pixel area = 4.78² = 22.85 µm²
K50 pixel area
Pixel pitch = 4.78 µm
Pixel area = 4.78² = 22.85 µm²
Pixel area = 4.78² = 22.85 µm²
Pixel density
Pixel density can be calculated with the following formula:
One could also use this formula:
Pixel density = (  sensor resolution width in pixels  )² / 1000000 
sensor width in cm 
One could also use this formula:
Pixel density =  effective megapixels × 1000000  / 10000 
sensor surface area in mm² 
K500 pixel density
Sensor resolution width = 4962 pixels
Sensor width = 2.37 cm
Pixel density = (4962 / 2.37)² / 1000000 = 4.38 MP/cm²
Sensor width = 2.37 cm
Pixel density = (4962 / 2.37)² / 1000000 = 4.38 MP/cm²
K50 pixel density
Sensor resolution width = 4962 pixels
Sensor width = 2.37 cm
Pixel density = (4962 / 2.37)² / 1000000 = 4.38 MP/cm²
Sensor width = 2.37 cm
Pixel density = (4962 / 2.37)² / 1000000 = 4.38 MP/cm²
Sensor resolution
Sensor resolution is calculated from sensor size and effective megapixels. It's slightly higher
than maximum (not interpolated) image resolution which is usually stated on camera specifications.
Sensor resolution is used in pixel pitch, pixel area, and pixel density formula.
For sake of simplicity, we're going to calculate it in 3 stages.
1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.
2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.
2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:
(X × r) × X = effective megapixels × 1000000 → 

Resolution horizontal: X × r
Resolution vertical: X
K500 sensor resolution
Sensor width = 23.70 mm
Sensor height = 15.70 mm
Effective megapixels = 16.30
Resolution horizontal: X × r = 3286 × 1.51 = 4962
Resolution vertical: X = 3286
Sensor resolution = 4962 x 3286
Sensor height = 15.70 mm
Effective megapixels = 16.30
r = 23.70/15.70 = 1.51 

Resolution vertical: X = 3286
Sensor resolution = 4962 x 3286
K50 sensor resolution
Sensor width = 23.70 mm
Sensor height = 15.70 mm
Effective megapixels = 16.30
Resolution horizontal: X × r = 3286 × 1.51 = 4962
Resolution vertical: X = 3286
Sensor resolution = 4962 x 3286
Sensor height = 15.70 mm
Effective megapixels = 16.30
r = 23.70/15.70 = 1.51 

Resolution vertical: X = 3286
Sensor resolution = 4962 x 3286
Crop factor
Crop factor or focal length multiplier is calculated by dividing the diagonal
of 35 mm film (43.27 mm) with the diagonal of the sensor.
Crop factor =  43.27 mm 
sensor diagonal in mm 
K500 crop factor
Sensor diagonal in mm = 28.43 mm
Crop factor =  43.27  = 1.52 
28.43 
K50 crop factor
Sensor diagonal in mm = 28.43 mm
Crop factor =  43.27  = 1.52 
28.43 
35 mm equivalent aperture
Equivalent aperture (in 135 film terms) is calculated by multiplying lens aperture
with crop factor (a.k.a. focal length multiplier).
K500 equivalent aperture
Aperture is a lens characteristic, so it's calculated only for
fixed lens cameras. If you want to know the equivalent aperture for
Pentax K500, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Pentax K500 is 1.52
Crop factor for Pentax K500 is 1.52
K50 equivalent aperture
Aperture is a lens characteristic, so it's calculated only for
fixed lens cameras. If you want to know the equivalent aperture for
Pentax K50, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Pentax K50 is 1.52
Crop factor for Pentax K50 is 1.52
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