Canon PowerShot G7 X Mark III vs. Pentax K-1

Comparison

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PowerShot G7 X Mark III image
vs
K-1 image
Canon PowerShot G7 X Mark III Pentax K-1
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Megapixels
20.10
36.40
Max. image resolution
5472 x 3648
7360 x 4912

Sensor

Sensor type
CMOS
CMOS
Sensor size
13.2 x 8.8 mm
35.9 x 24 mm
Sensor resolution
5492 x 3661
7389 x 4926
Diagonal
15.86 mm
43.18 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 : 7.42
(ratio)
Canon PowerShot G7 X Mark III Pentax K-1
Surface area:
116.16 mm² vs 861.60 mm²
Difference: 745.44 mm² (642%)
K-1 sensor is approx. 7.42x bigger than G7 X Mark III sensor.
Note: You are comparing cameras of different generations. There is a 3 year gap between Canon G7 X Mark III (2019) and Pentax K-1 (2016). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
2.4 µm
4.86 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: 2.46 µm (103%)
Pixel pitch of K-1 is approx. 103% higher than pixel pitch of G7 X Mark III.
Pixel area
5.76 µm²
23.62 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: 17.86 µm² (310%)
A pixel on Pentax K-1 sensor is approx. 310% bigger than a pixel on Canon G7 X Mark III.
Pixel density
17.31 MP/cm²
4.24 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: 13.07 µm (308%)
Canon G7 X Mark III has approx. 308% higher pixel density than Pentax K-1.
To learn about the accuracy of these numbers, click here.



Specs

Canon G7 X Mark III
Pentax K-1
Crop factor
2.73
1
Total megapixels
20.90
36.77
Effective megapixels
20.10
36.40
Optical zoom
4.2x
 
Digital zoom
Yes
ISO sensitivity
Auto, 125-12800 (extends to 25600)
Auto, 100-204800
RAW
Manual focus
Normal focus range
5 cm
Macro focus range
Focal length (35mm equiv.)
24 - 100 mm
Aperture priority
Yes
Yes
Max. aperture
f1.8 - f2.8
Max. aperture (35mm equiv.)
f4.9 - f7.6
n/a
Metering
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±3 EV (in 1/3 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
1/2000 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
None
Optical (pentaprism)
White balance presets
6
8
Screen size
3"
3.2"
Screen resolution
1,040,000 dots
1,036,800 dots
Video capture
Max. video resolution
3840x2160 (30p/​25p)
1920x1080 (60i/50i/30p/25p/24p)
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC (UHS-I)
USB
USB 3.0 (5 GBit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
NB-13L lithium-ion battery
D-LI90 lithium-ion battery
Weight
304 g
1010 g
Dimensions
105.5 x 60.9 x 41.4 mm
136.5 x 110 x 85.5 mm
Year
2019
2016




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Diagonal

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

Canon G7 X Mark III diagonal

w = 13.20 mm
h = 8.80 mm
Diagonal =  13.20² + 8.80²   = 15.86 mm

Pentax K-1 diagonal

w = 35.90 mm
h = 24.00 mm
Diagonal =  35.90² + 24.00²   = 43.18 mm


Surface area

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

G7 X Mark III sensor area

Width = 13.20 mm
Height = 8.80 mm

Surface area = 13.20 × 8.80 = 116.16 mm²

K-1 sensor area

Width = 35.90 mm
Height = 24.00 mm

Surface area = 35.90 × 24.00 = 861.60 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

G7 X Mark III pixel pitch

Sensor width = 13.20 mm
Sensor resolution width = 5492 pixels
Pixel pitch =   13.20  × 1000  = 2.4 µm
5492

K-1 pixel pitch

Sensor width = 35.90 mm
Sensor resolution width = 7389 pixels
Pixel pitch =   35.90  × 1000  = 4.86 µm
7389


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

G7 X Mark III pixel area

Pixel pitch = 2.4 µm

Pixel area = 2.4² = 5.76 µm²

K-1 pixel area

Pixel pitch = 4.86 µm

Pixel area = 4.86² = 23.62 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

G7 X Mark III pixel density

Sensor resolution width = 5492 pixels
Sensor width = 1.32 cm

Pixel density = (5492 / 1.32)² / 1000000 = 17.31 MP/cm²

K-1 pixel density

Sensor resolution width = 7389 pixels
Sensor width = 3.59 cm

Pixel density = (7389 / 3.59)² / 1000000 = 4.24 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

G7 X Mark III sensor resolution

Sensor width = 13.20 mm
Sensor height = 8.80 mm
Effective megapixels = 20.10
r = 13.20/8.80 = 1.5
X =  20.10 × 1000000  = 3661
1.5
Resolution horizontal: X × r = 3661 × 1.5 = 5492
Resolution vertical: X = 3661

Sensor resolution = 5492 x 3661

K-1 sensor resolution

Sensor width = 35.90 mm
Sensor height = 24.00 mm
Effective megapixels = 36.40
r = 35.90/24.00 = 1.5
X =  36.40 × 1000000  = 4926
1.5
Resolution horizontal: X × r = 4926 × 1.5 = 7389
Resolution vertical: X = 4926

Sensor resolution = 7389 x 4926


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


G7 X Mark III crop factor

Sensor diagonal in mm = 15.86 mm
Crop factor =   43.27  = 2.73
15.86

K-1 crop factor

Sensor diagonal in mm = 43.18 mm
Crop factor =   43.27  = 1
43.18

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).

G7 X Mark III equivalent aperture

Crop factor = 2.73
Aperture = f1.8 - f2.8

35-mm equivalent aperture = (f1.8 - f2.8) × 2.73 = f4.9 - f7.6

K-1 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 K-1, take the aperture of the lens you're using and multiply it with crop factor.

Since crop factor for Pentax K-1 is 1, the equivalent aperture is aperture.

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