Canon PowerShot G7 X Mark III vs. Canon PowerShot G9

Comparison

change cameras »
PowerShot G7 X Mark III image
vs
PowerShot G9 image
Canon PowerShot G7 X Mark III Canon PowerShot G9
check price » check price »
Megapixels
20.10
12.10
Max. image resolution
5472 x 3648
4000 x 3000

Sensor

Sensor type
CMOS
CCD
Sensor size
13.2 x 8.8 mm
1/1.7" (~ 7.53 x 5.64 mm)
Sensor resolution
5492 x 3661
4027 x 3005
Diagonal
15.86 mm
9.41 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
2.74 : 1
(ratio)
Canon PowerShot G7 X Mark III Canon PowerShot G9
Surface area:
116.16 mm² vs 42.47 mm²
Difference: 73.69 mm² (174%)
G7 X Mark III sensor is approx. 2.74x bigger than G9 sensor.
Note: You are comparing sensors of vastly different generations. There is a gap of 12 years between Canon G7 X Mark III (2019) and Canon G9 (2007). Twelve years is a huge amount of time, technology wise, resulting in newer sensor being much more efficient than the older one.
Pixel pitch
2.4 µm
1.87 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: 0.53 µm (28%)
Pixel pitch of G7 X Mark III is approx. 28% higher than pixel pitch of G9.
Pixel area
5.76 µm²
3.5 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: 2.26 µm² (65%)
A pixel on Canon G7 X Mark III sensor is approx. 65% bigger than a pixel on Canon G9.
Pixel density
17.31 MP/cm²
28.6 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: 11.29 µm (65%)
Canon G9 has approx. 65% higher pixel density than Canon G7 X Mark III.
To learn about the accuracy of these numbers, click here.



Specs

Canon G7 X Mark III
Canon G9
Crop factor
2.73
4.6
Total megapixels
20.90
12.40
Effective megapixels
20.10
12.10
Optical zoom
4.2x
6x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 125-12800 (extends to 25600)
Auto, 80, 100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
5 cm
45 cm
Macro focus range
1 cm
Focal length (35mm equiv.)
24 - 100 mm
35 - 210 mm
Aperture priority
Yes
Yes
Max. aperture
f1.8 - f2.8
f2.8 - f4.8
Max. aperture (35mm equiv.)
f4.9 - f7.6
f12.9 - f22.1
Metering
Multi, Center-weighted, Spot
Centre weighted, Evaluative, Spot
Exposure compensation
±3 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
30 sec
15 sec
Max. shutter speed
1/2000 sec
1/2500 sec
Built-in flash
External flash
Viewfinder
None
Optical (tunnel)
White balance presets
6
8
Screen size
3"
3"
Screen resolution
1,040,000 dots
230,000 dots
Video capture
Max. video resolution
3840x2160 (30p/‚Äč25p)
Storage types
SD/SDHC/SDXC
MultiMedia, SDHC, Secure Digital
USB
USB 3.0 (5 GBit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
NB-13L lithium-ion battery
Canon Lithium-Ion
Weight
304 g
320 g
Dimensions
105.5 x 60.9 x 41.4 mm
106.4 x 71.9 x 42.5 mm
Year
2019
2007




Choose cameras to compare

vs

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

Canon G9 diagonal

The diagonal of G9 sensor is not 1/1.7 or 0.59" (14.9 mm) as you might expect, but approximately two thirds of that value - 9.41 mm. If you want to know why, see sensor sizes.

w = 7.53 mm
h = 5.64 mm
Diagonal =  7.53² + 5.64²   = 9.41 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

G9 sensor area

Width = 7.53 mm
Height = 5.64 mm

Surface area = 7.53 × 5.64 = 42.47 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

G9 pixel pitch

Sensor width = 7.53 mm
Sensor resolution width = 4027 pixels
Pixel pitch =   7.53  × 1000  = 1.87 µm
4027


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

G9 pixel area

Pixel pitch = 1.87 µm

Pixel area = 1.87² = 3.5 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

G9 pixel density

Sensor resolution width = 4027 pixels
Sensor width = 0.753 cm

Pixel density = (4027 / 0.753)² / 1000000 = 28.6 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

G9 sensor resolution

Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 12.10
r = 7.53/5.64 = 1.34
X =  12.10 × 1000000  = 3005
1.34
Resolution horizontal: X × r = 3005 × 1.34 = 4027
Resolution vertical: X = 3005

Sensor resolution = 4027 x 3005


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

G9 crop factor

Sensor diagonal in mm = 9.41 mm
Crop factor =   43.27  = 4.6
9.41

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

G9 equivalent aperture

Crop factor = 4.6
Aperture = f2.8 - f4.8

35-mm equivalent aperture = (f2.8 - f4.8) × 4.6 = f12.9 - f22.1

Enter your screen size (diagonal)

My screen size is  inches



Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.