Pentax K500 vs. Pentax K50

vs. 

Comparison 
Pentax K500  Pentax K50  
Megapixels

16.30  16.30  
Max. resolution

4928 x 3264  4928 x 3264  
Price

Amazon, B&H Photo, Adorama  Amazon, B&H Photo, Adorama  
Sensor 

Sensor type

CMOS  CMOS  
Sensor size

23.7 x 15.7 mm  23.7 x 15.7 mm  
Sensor resolution

4962 x 3286  4962 x 3286  
Diagonal

28.43 mm  28.43 mm  
Surface area

372.09 mm²  372.09 mm²  
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 » 
Actual sensor sizes:
Surface area:
Pentax K500 and Pentax K50 have the same surface area.


Pixel pitch

4.78 µm  4.78 µm  
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. 
Pixel pitch
Pentax K500 and Pentax K50 have the same pixel pitch.


Pixel area

22.85 µm²  22.85 µm²  
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. 
Relative pixel sizes:
Pentax K500 and Pentax K50 have the same pixel area.


Pixel density

4.38 MP/cm²  4.38 MP/cm²  
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. 
Pixel density
Pentax K500 and Pentax K50 have the same pixel density.

To learn about the accuracy of these numbers,
click here.
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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.
Pentax K500 surface 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
Pentax K50 surface 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 
Pentax 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 
Pentax 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 
Pentax K500 pixel area
Pixel pitch = 4.78 µm
Pixel area = 4.78² = 22.85 µm²
Pixel area = 4.78² = 22.85 µm²
Pentax 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:
You could also use this formula:
Pixel density = (  sensor resolution width in pixels  )² / 1000000 
sensor width in cm 
You could also use this formula:
Pixel density =  effective megapixels × 1000000  / 10000 
sensor surface area in mm² 
Pentax 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
Pentax 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. 22.8 × 15.5 sensor for example has a ratio of 1.47.
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. 22.8 × 15.5 sensor for example has a ratio of 1.47.
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
Pentax 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
Pentax 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 
Pentax K500 crop factor
Sensor diagonal in mm = 28.43 mm
Crop factor =  43.27  = 1.52 
28.43 
Pentax 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).
Pentax 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
Pentax 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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