Canon Digital IXUS 900 Ti vs. Canon Digital IXUS 950 IS

Comparison

change cameras » vs Canon Digital IXUS 900 Ti Canon Digital IXUS 950 IS
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Megapixels
10.00
8.00
Max. image resolution
3648 x 2736
3264 x 2448

Sensor

Sensor type
CCD
CCD
Sensor size
1/1.8" (~ 7.11 x 5.33 mm)
1/2.5" (~ 5.75 x 4.32 mm)
Sensor resolution
3647 x 2742
3262 x 2453
Diagonal
8.89 mm
7.19 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.

Actual sensor size

Note: Actual size is set to screen → change »
 vs 1.53 : 1 (ratio) Canon Digital IXUS 900 Ti Canon Digital IXUS 950 IS
Surface area:
 37.90 mm² vs 24.84 mm²
Difference: 13.06 mm² (53%)
IXUS 900 Ti sensor is approx. 1.53x bigger than IXUS 950 IS sensor.
Pixel pitch
1.95 µm
1.76 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: 0.19 µm (11%)
Pixel pitch of IXUS 900 Ti is approx. 11% higher than pixel pitch of IXUS 950 IS.
Pixel area
3.8 µm²
3.1 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: 0.7 µm² (23%)
A pixel on Canon IXUS 900 Ti sensor is approx. 23% bigger than a pixel on Canon IXUS 950 IS.
Pixel density
26.31 MP/cm²
32.18 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: 5.87 µm (22%)
Canon IXUS 950 IS has approx. 22% higher pixel density than Canon IXUS 900 Ti.

Specs

Canon IXUS 900 Ti
Canon IXUS 950 IS
Crop factor
4.87
6.02
Total megapixels
10.30
8.20
Effective megapixels
10.00
8.00
Optical zoom
3x
4x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80 ,100, 200, 400, 800, 1600
Auto, 80 ,100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
45 cm
45 cm
Macro focus range
5 cm
2 cm
Focal length (35mm equiv.)
37 - 111 mm
35 - 140 mm
Aperture priority
No
No
Max. aperture
f2.8 - f4.9
f2.8 - f5.5
Max. aperture (35mm equiv.)
f13.6 - f23.9
f16.9 - f33.1
Metering
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
15 sec
15 sec
Max. shutter speed
1/2000 sec
1/1600 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
Optical (tunnel)
White balance presets
5
5
Screen size
2.5"
2.5"
Screen resolution
230,000 dots
230,000 dots
Video capture
Max. video resolution
Storage types
SD/MMC card
SD/SDHC/MMC card
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion NB-5L battery
Lithium-Ion NB-5L battery
Weight
205 g
195 g
Dimensions
91 x 57 x 28 mm
90 x 57 x 26 mm
Year
2006
2007

 vs

Diagonal

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

Canon IXUS 900 Ti diagonal

The diagonal of IXUS 900 Ti sensor is not 1/1.8 or 0.56" (14.1 mm) as you might expect, but approximately two thirds of that value - 8.89 mm. If you want to know why, see sensor sizes.

w = 7.11 mm
h = 5.33 mm
 Diagonal = √ 7.11² + 5.33² = 8.89 mm

Canon IXUS 950 IS diagonal

The diagonal of IXUS 950 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

Surface area

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

IXUS 900 Ti sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

IXUS 950 IS sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 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 900 Ti pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 3647 pixels
 Pixel pitch = 7.11 × 1000 = 1.95 µm 3647

IXUS 950 IS pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 3262 pixels
 Pixel pitch = 5.75 × 1000 = 1.76 µm 3262

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 900 Ti pixel area

Pixel pitch = 1.95 µm

Pixel area = 1.95² = 3.8 µm²

IXUS 950 IS pixel area

Pixel pitch = 1.76 µm

Pixel area = 1.76² = 3.1 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 900 Ti pixel density

Sensor resolution width = 3647 pixels
Sensor width = 0.711 cm

Pixel density = (3647 / 0.711)² / 1000000 = 26.31 MP/cm²

IXUS 950 IS pixel density

Sensor resolution width = 3262 pixels
Sensor width = 0.575 cm

Pixel density = (3262 / 0.575)² / 1000000 = 32.18 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 900 Ti sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 10.00
r = 7.11/5.33 = 1.33
 X = √ 10.00 × 1000000 = 2742 1.33
Resolution horizontal: X × r = 2742 × 1.33 = 3647
Resolution vertical: X = 2742

Sensor resolution = 3647 x 2742

IXUS 950 IS sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 8.00
r = 5.75/4.32 = 1.33
 X = √ 8.00 × 1000000 = 2453 1.33
Resolution horizontal: X × r = 2453 × 1.33 = 3262
Resolution vertical: X = 2453

Sensor resolution = 3262 x 2453

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 900 Ti crop factor

Sensor diagonal in mm = 8.89 mm
 Crop factor = 43.27 = 4.87 8.89

IXUS 950 IS crop factor

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

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 900 Ti equivalent aperture

Crop factor = 4.87
Aperture = f2.8 - f4.9

35-mm equivalent aperture = (f2.8 - f4.9) × 4.87 = f13.6 - f23.9

IXUS 950 IS equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5.5

35-mm equivalent aperture = (f2.8 - f5.5) × 6.02 = f16.9 - f33.1
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