Canon IXY DIGITAL 900 IS vs. Canon PowerShot G7 X

Comparison

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IXY DIGITAL 900 IS image
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PowerShot G7 X image
Canon IXY DIGITAL 900 IS Canon PowerShot G7 X
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Megapixels
7.10
20.20
Max. image resolution
3072 x 2304
5472 x 3648

Sensor

Sensor type
CCD
CMOS
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
13.2 x 8.8 mm
Sensor resolution
3072 x 2310
5505 x 3670
Diagonal
7.19 mm
15.86 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 : 4.68
(ratio)
Canon IXY DIGITAL 900 IS Canon PowerShot G7 X
Surface area:
24.84 mm² vs 116.16 mm²
Difference: 91.32 mm² (368%)
G7 X sensor is approx. 4.68x bigger than IXY DIGITAL 900 IS sensor.
Note: You are comparing sensors of very different generations. There is a gap of 8 years between Canon IXY DIGITAL 900 IS (2006) and Canon G7 X (2014). Eight years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
1.87 µm
2.4 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 is approx. 28% higher than pixel pitch of IXY DIGITAL 900 IS.
Pixel area
3.5 µm²
5.76 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 sensor is approx. 65% bigger than a pixel on Canon IXY DIGITAL 900 IS.
Pixel density
28.54 MP/cm²
17.39 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: 11.15 µm (64%)
Canon IXY DIGITAL 900 IS has approx. 64% higher pixel density than Canon G7 X.
To learn about the accuracy of these numbers, click here.



Specs

Canon IXY DIGITAL 900 IS
Canon G7 X
Crop factor
6.02
2.73
Total megapixels
20.90
Effective megapixels
7.10
20.20
Optical zoom
3.8x
4.2x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80 ,100, 200, 400, 800, 1600
Auto, 125-12800
RAW
Manual focus
Normal focus range
45 cm
5 cm
Macro focus range
3 cm
5 cm
Focal length (35mm equiv.)
28 - 105 mm
24 - 100 mm
Aperture priority
No
Yes
Max. aperture
f2.8 - f5.8
f1.8 - f2.8
Max. aperture (35mm equiv.)
f16.9 - f34.9
f4.9 - f7.6
Metering
Multi, Center-weighted, Spot
Evaluative, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
15 sec
250 sec
Max. shutter speed
1/1600 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
None
White balance presets
5
8
Screen size
2.5"
3"
Screen resolution
207,000 dots
1,040,000 dots
Video capture
Max. video resolution
1920x1080 (60p/30p)
Storage types
SD/SDHC/MMC card
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion NB-5L battery
Battery Pack NB-13L
Weight
195 g
304 g
Dimensions
90 x 58 x 25 mm
103 x 60.4 x 40.4 mm
Year
2006
2014




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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 IXY DIGITAL 900 IS diagonal

The diagonal of IXY DIGITAL 900 IS sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of that value - 7.19 mm. If you want to know why, see sensor sizes.

w = 5.75 mm
h = 4.32 mm
Diagonal =  5.75² + 4.32²   = 7.19 mm

Canon G7 X diagonal

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


Surface area

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

IXY DIGITAL 900 IS sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

G7 X sensor area

Width = 13.20 mm
Height = 8.80 mm

Surface area = 13.20 × 8.80 = 116.16 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

IXY DIGITAL 900 IS pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 3072 pixels
Pixel pitch =   5.75  × 1000  = 1.87 µm
3072

G7 X pixel pitch

Sensor width = 13.20 mm
Sensor resolution width = 5505 pixels
Pixel pitch =   13.20  × 1000  = 2.4 µm
5505


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

IXY DIGITAL 900 IS pixel area

Pixel pitch = 1.87 µm

Pixel area = 1.87² = 3.5 µm²

G7 X pixel area

Pixel pitch = 2.4 µm

Pixel area = 2.4² = 5.76 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

IXY DIGITAL 900 IS pixel density

Sensor resolution width = 3072 pixels
Sensor width = 0.575 cm

Pixel density = (3072 / 0.575)² / 1000000 = 28.54 MP/cm²

G7 X pixel density

Sensor resolution width = 5505 pixels
Sensor width = 1.32 cm

Pixel density = (5505 / 1.32)² / 1000000 = 17.39 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

IXY DIGITAL 900 IS sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 7.10
r = 5.75/4.32 = 1.33
X =  7.10 × 1000000  = 2310
1.33
Resolution horizontal: X × r = 2310 × 1.33 = 3072
Resolution vertical: X = 2310

Sensor resolution = 3072 x 2310

G7 X sensor resolution

Sensor width = 13.20 mm
Sensor height = 8.80 mm
Effective megapixels = 20.20
r = 13.20/8.80 = 1.5
X =  20.20 × 1000000  = 3670
1.5
Resolution horizontal: X × r = 3670 × 1.5 = 5505
Resolution vertical: X = 3670

Sensor resolution = 5505 x 3670


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


IXY DIGITAL 900 IS crop factor

Sensor diagonal in mm = 7.19 mm
Crop factor =   43.27  = 6.02
7.19

G7 X crop factor

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

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).

IXY DIGITAL 900 IS equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5.8

35-mm equivalent aperture = (f2.8 - f5.8) × 6.02 = f16.9 - f34.9

G7 X 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

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