Canon Digital IXUS i Zoom vs. Canon PowerShot A75

Comparison

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Digital IXUS i Zoom image
vs
PowerShot A75 image
Canon Digital IXUS i Zoom Canon PowerShot A75
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Megapixels
5.00
3.10
Max. image resolution
2592 x 1944
2048 x 1536

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/2.7" (~ 5.33 x 4 mm)
Sensor resolution
2579 x 1939
2031 x 1527
Diagonal
7.19 mm
6.66 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
1.17 : 1
(ratio)
Canon Digital IXUS i Zoom Canon PowerShot A75
Surface area:
24.84 mm² vs 21.32 mm²
Difference: 3.52 mm² (17%)
IXUS i Zoom sensor is approx. 1.17x bigger than A75 sensor.
Pixel pitch
2.23 µm
2.62 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: 0.39 µm (17%)
Pixel pitch of A75 is approx. 17% higher than pixel pitch of IXUS i Zoom.
Pixel area
4.97 µm²
6.86 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: 1.89 µm² (38%)
A pixel on Canon A75 sensor is approx. 38% bigger than a pixel on Canon IXUS i Zoom.
Pixel density
20.12 MP/cm²
14.52 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: 5.6 µm (39%)
Canon IXUS i Zoom has approx. 39% higher pixel density than Canon A75.
To learn about the accuracy of these numbers, click here.



Specs

Canon IXUS i Zoom
Canon A75
Crop factor
6.02
6.5
Total megapixels
5.00
3.30
Effective megapixels
5.00
3.10
Optical zoom
2.4x
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 50, 100, 200, 400
Auto, 50, 100, 200, 400
RAW
Manual focus
Normal focus range
50 cm
46 cm
Macro focus range
10 cm
5 cm
Focal length (35mm equiv.)
38 - 90 mm
35 - 105 mm
Aperture priority
No
Yes
Max. aperture
f3.2 - f5.4
f2.8 - f4.8
Max. aperture (35mm equiv.)
f19.3 - f32.5
f18.2 - f31.2
Metering
Multi, Center-weighted, Spot
Centre weighted, Evaluative, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
15 sec
15 sec
Max. shutter speed
1/1600 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
Optical (tunnel)
White balance presets
6
6
Screen size
1.8"
1.8"
Screen resolution
118,000 dots
118,000 dots
Video capture
Max. video resolution
Storage types
SD/MMC card
CompactFlash type I
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
Lithium-Ion NB-4L battery
AA (4) batteries (NiMH recommended)
Weight
120 g
200 g
Dimensions
96 x 45 x 24 mm
101 x 64 x 32 mm
Year
2005
2004




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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

Canon IXUS i Zoom diagonal

The diagonal of IXUS i Zoom 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 A75 diagonal

The diagonal of A75 sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of that value - 6.66 mm. If you want to know why, see sensor sizes.

w = 5.33 mm
h = 4.00 mm
Diagonal =  5.33² + 4.00²   = 6.66 mm


Surface area

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

IXUS i Zoom sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

A75 sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 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

IXUS i Zoom pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2579 pixels
Pixel pitch =   5.75  × 1000  = 2.23 µm
2579

A75 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 2031 pixels
Pixel pitch =   5.33  × 1000  = 2.62 µm
2031


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

IXUS i Zoom pixel area

Pixel pitch = 2.23 µm

Pixel area = 2.23² = 4.97 µm²

A75 pixel area

Pixel pitch = 2.62 µm

Pixel area = 2.62² = 6.86 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

IXUS i Zoom pixel density

Sensor resolution width = 2579 pixels
Sensor width = 0.575 cm

Pixel density = (2579 / 0.575)² / 1000000 = 20.12 MP/cm²

A75 pixel density

Sensor resolution width = 2031 pixels
Sensor width = 0.533 cm

Pixel density = (2031 / 0.533)² / 1000000 = 14.52 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

IXUS i Zoom sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 5.00
r = 5.75/4.32 = 1.33
X =  5.00 × 1000000  = 1939
1.33
Resolution horizontal: X × r = 1939 × 1.33 = 2579
Resolution vertical: X = 1939

Sensor resolution = 2579 x 1939

A75 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 3.10
r = 5.33/4.00 = 1.33
X =  3.10 × 1000000  = 1527
1.33
Resolution horizontal: X × r = 1527 × 1.33 = 2031
Resolution vertical: X = 1527

Sensor resolution = 2031 x 1527


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


IXUS i Zoom crop factor

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

A75 crop factor

Sensor diagonal in mm = 6.66 mm
Crop factor =   43.27  = 6.5
6.66

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).

IXUS i Zoom equivalent aperture

Crop factor = 6.02
Aperture = f3.2 - f5.4

35-mm equivalent aperture = (f3.2 - f5.4) × 6.02 = f19.3 - f32.5

A75 equivalent aperture

Crop factor = 6.5
Aperture = f2.8 - f4.8

35-mm equivalent aperture = (f2.8 - f4.8) × 6.5 = f18.2 - f31.2

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