Canon Digital IXUS i7 vs. Canon IXUS 285 HS
Comparison
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Canon Digital IXUS i7 | Canon IXUS 285 HS | ||||
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Megapixels
7.10
20.20
Max. image resolution
3072 x 2304
5184 x 3888
Sensor
Sensor type
CCD
CMOS
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/2.3" (~ 6.16 x 4.62 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 »
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 »
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Canon Digital IXUS i7 | Canon IXUS 285 HS |
Surface area:
24.84 mm² | vs | 28.46 mm² |
Difference: 3.62 mm² (15%)
IXUS 285 HS sensor is approx. 1.15x bigger than IXUS i7 sensor.
Note: You are comparing sensors of very different generations.
There is a gap of 10 years between Canon IXUS i7 (2006) and Canon IXUS 285 HS (2016).
Ten years is a lot of time in terms
of technology, meaning newer sensors are overall much more
efficient than the older ones.
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.
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.
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.
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: 2.08 µm² (146%)
A pixel on Canon IXUS i7 sensor is approx. 146% bigger than a pixel on Canon IXUS 285 HS.
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.
Higher pixel density means smaller pixels and lower pixel density means larger pixels.
To learn about the accuracy of these numbers,
click here.
Specs
Canon IXUS i7
Canon IXUS 285 HS
Total megapixels
7.10
21.10
Effective megapixels
7.10
20.20
Optical zoom
2.4x
12x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400, 800, 1600
Auto, 80-3200
RAW
Manual focus
Normal focus range
45 cm
5 cm
Macro focus range
10 cm
1 cm
Focal length (35mm equiv.)
38 - 90 mm
25 - 300 mm
Aperture priority
No
No
Max. aperture
f3.2 - f5.4
f3.6 - f7
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
1/1600 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
6
5
Screen size
1.8"
3"
Screen resolution
118,000 dots
460,800 dots
Video capture
Max. video resolution
1920x1080 (30p)
Storage types
SD/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-4L battery
NB-11LH lithium-ion battery
Weight
120 g
147 g
Dimensions
96 x 45 x 24 mm
99.6 x 58 x 22.8 mm
Year
2006
2016
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
Diagonal = √ | w² + h² |
Canon IXUS i7 diagonal
The diagonal of IXUS i7 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
w = 5.75 mm
h = 4.32 mm
Diagonal = √ | 5.75² + 4.32² | = 7.19 mm |
Canon IXUS 285 HS diagonal
The diagonal of IXUS 285 HS sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of
that value - 7.7 mm. If you want to know why, see
sensor sizes.
w = 6.16 mm
h = 4.62 mm
w = 6.16 mm
h = 4.62 mm
Diagonal = √ | 6.16² + 4.62² | = 7.70 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
IXUS i7 sensor area
Width = 5.75 mm
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 mm²
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 mm²
IXUS 285 HS sensor area
Width = 6.16 mm
Height = 4.62 mm
Surface area = 6.16 × 4.62 = 28.46 mm²
Height = 4.62 mm
Surface area = 6.16 × 4.62 = 28.46 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 i7 pixel pitch
Sensor width = 5.75 mm
Sensor resolution width = 3072 pixels
Sensor resolution width = 3072 pixels
Pixel pitch = | 5.75 | × 1000 | = 1.87 µm |
3072 |
IXUS 285 HS pixel pitch
Sensor width = 6.16 mm
Sensor resolution width = 5183 pixels
Sensor resolution width = 5183 pixels
Pixel pitch = | 6.16 | × 1000 | = 1.19 µm |
5183 |
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
Pixel area = | sensor surface area in mm² |
effective megapixels |
IXUS i7 pixel area
Pixel pitch = 1.87 µm
Pixel area = 1.87² = 3.5 µm²
Pixel area = 1.87² = 3.5 µm²
IXUS 285 HS pixel area
Pixel pitch = 1.19 µm
Pixel area = 1.19² = 1.42 µm²
Pixel area = 1.19² = 1.42 µm²
Pixel density
Pixel density can be calculated with the following formula:
One could also use this 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 i7 pixel density
Sensor resolution width = 3072 pixels
Sensor width = 0.575 cm
Pixel density = (3072 / 0.575)² / 1000000 = 28.54 MP/cm²
Sensor width = 0.575 cm
Pixel density = (3072 / 0.575)² / 1000000 = 28.54 MP/cm²
IXUS 285 HS pixel density
Sensor resolution width = 5183 pixels
Sensor width = 0.616 cm
Pixel density = (5183 / 0.616)² / 1000000 = 70.79 MP/cm²
Sensor width = 0.616 cm
Pixel density = (5183 / 0.616)² / 1000000 = 70.79 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:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
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 → |
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Resolution horizontal: X × r
Resolution vertical: X
IXUS i7 sensor resolution
Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 7.10
Resolution horizontal: X × r = 2310 × 1.33 = 3072
Resolution vertical: X = 2310
Sensor resolution = 3072 x 2310
Sensor height = 4.32 mm
Effective megapixels = 7.10
r = 5.75/4.32 = 1.33 |
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Resolution vertical: X = 2310
Sensor resolution = 3072 x 2310
IXUS 285 HS sensor resolution
Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 20.20
Resolution horizontal: X × r = 3897 × 1.33 = 5183
Resolution vertical: X = 3897
Sensor resolution = 5183 x 3897
Sensor height = 4.62 mm
Effective megapixels = 20.20
r = 6.16/4.62 = 1.33 |
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Resolution vertical: X = 3897
Sensor resolution = 5183 x 3897
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 i7 crop factor
Sensor diagonal in mm = 7.19 mm
Crop factor = | 43.27 | = 6.02 |
7.19 |
IXUS 285 HS crop factor
Sensor diagonal in mm = 7.70 mm
Crop factor = | 43.27 | = 5.62 |
7.70 |
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 i7 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
Aperture = f3.2 - f5.4
35-mm equivalent aperture = (f3.2 - f5.4) × 6.02 = f19.3 - f32.5
IXUS 285 HS equivalent aperture
Crop factor = 5.62
Aperture = f3.6 - f7
35-mm equivalent aperture = (f3.6 - f7) × 5.62 = f20.2 - f39.3
Aperture = f3.6 - f7
35-mm equivalent aperture = (f3.6 - f7) × 5.62 = f20.2 - f39.3
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