Pentax KP vs. Nikon D7500

Comparison

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KP image
vs
D7500 image
Pentax KP Nikon D7500
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Megapixels
24.32
20.90
Max. image resolution
6016 x 4000
5568 x 3712

Sensor

Sensor type
CMOS
CMOS
Sensor size
23.5 x 15.6 mm
23.5 x 15.7 mm
Sensor resolution
6060 x 4013
5600 x 3733
Diagonal
28.21 mm
28.26 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 »

Actual sensor size

Note: Actual size is set to screen → change »
vs
1 : 1.01
(ratio)
Pentax KP Nikon D7500
Surface area:
366.60 mm² vs 368.95 mm²
Difference: 2.35 mm² (0.6%)
D7500 sensor is slightly bigger than KP sensor (only 0.6% difference).
Pixel pitch
3.88 µm
4.2 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.
Difference: 0.32 µm (8%)
Pixel pitch of D7500 is approx. 8% higher than pixel pitch of KP.
Pixel area
15.05 µm²
17.64 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:
vs
Pixel area difference: 2.59 µm² (17%)
A pixel on Nikon D7500 sensor is approx. 17% bigger than a pixel on Pentax KP.
Pixel density
6.65 MP/cm²
5.68 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.
Difference: 0.97 µm (17%)
Pentax KP has approx. 17% higher pixel density than Nikon D7500.
To learn about the accuracy of these numbers, click here.

Specs

Pentax KP
Nikon D7500
Crop factor
1.53
1.53
Total megapixels
24.96
21.51
Effective megapixels
24.32
20.90
Optical zoom
 
 
Digital zoom
ISO sensitivity
Auto, 100-819200
Auto, 100 - 51200 (expandable to 50 - 1640000)
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Max. aperture (35mm equiv.)
n/a
n/a
Metering
Multi, Center-weighted, Spot
Multi, Center-weighted, Highlight-weighted, 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
1/8000 sec
Built-in flash
External flash
Viewfinder
Optical (pentaprism)
Optical (pentaprism)
White balance presets
9
12
Screen size
3"
3.2"
Screen resolution
921,600 dots
921,600 dots
Video capture
Max. video resolution
1920x1080 (60i/50i/30p/25p/24p)
3840x2160 (30p/25p/24p)
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
D-LI109 lithium-ion battery
EN-EL15a lithium-ion rechargeable battery
Weight
699 g
640 g
Dimensions
132 x 101 x 76 mm
135.5 x 104 x 72.5 mm
Year
2017
2017



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vs

Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Pentax KP diagonal

w = 23.50 mm
h = 15.60 mm
Diagonal =  23.50² + 15.60²   = 28.21 mm

Nikon D7500 diagonal

w = 23.50 mm
h = 15.70 mm
Diagonal =  23.50² + 15.70²   = 28.26 mm


Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

KP sensor area

Width = 23.50 mm
Height = 15.60 mm

Surface area = 23.50 × 15.60 = 366.60 mm²

D7500 sensor area

Width = 23.50 mm
Height = 15.70 mm

Surface area = 23.50 × 15.70 = 368.95 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

KP pixel pitch

Sensor width = 23.50 mm
Sensor resolution width = 6060 pixels
Pixel pitch =   23.50  × 1000  = 3.88 µm
6060

D7500 pixel pitch

Sensor width = 23.50 mm
Sensor resolution width = 5600 pixels
Pixel pitch =   23.50  × 1000  = 4.2 µm
5600


Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:
Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:
Pixel area =   sensor surface area in mm²
effective megapixels

KP pixel area

Pixel pitch = 3.88 µm

Pixel area = 3.88² = 15.05 µm²

D7500 pixel area

Pixel pitch = 4.2 µm

Pixel area = 4.2² = 17.64 µm²


Pixel density

Pixel density can be calculated with the following 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

KP pixel density

Sensor resolution width = 6060 pixels
Sensor width = 2.35 cm

Pixel density = (6060 / 2.35)² / 1000000 = 6.65 MP/cm²

D7500 pixel density

Sensor resolution width = 5600 pixels
Sensor width = 2.35 cm

Pixel density = (5600 / 2.35)² / 1000000 = 5.68 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:
(X × r) × X = effective megapixels × 1000000    →   
X =  effective megapixels × 1000000
r
3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

KP sensor resolution

Sensor width = 23.50 mm
Sensor height = 15.60 mm
Effective megapixels = 24.32
r = 23.50/15.60 = 1.51
X =  24.32 × 1000000  = 4013
1.51
Resolution horizontal: X × r = 4013 × 1.51 = 6060
Resolution vertical: X = 4013

Sensor resolution = 6060 x 4013

D7500 sensor resolution

Sensor width = 23.50 mm
Sensor height = 15.70 mm
Effective megapixels = 20.90
r = 23.50/15.70 = 1.5
X =  20.90 × 1000000  = 3733
1.5
Resolution horizontal: X × r = 3733 × 1.5 = 5600
Resolution vertical: X = 3733

Sensor resolution = 5600 x 3733


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


KP crop factor

Sensor diagonal in mm = 28.21 mm
Crop factor =   43.27  = 1.53
28.21

D7500 crop factor

Sensor diagonal in mm = 28.26 mm
Crop factor =   43.27  = 1.53
28.26

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).

KP 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 KP, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Pentax KP is 1.53

D7500 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 Nikon D7500, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Nikon D7500 is 1.53

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