Canon PowerShot SD770 IS vs. Canon PowerShot SD990 IS
Comparison
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Canon PowerShot SD770 IS | Canon PowerShot SD990 IS | ||||
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Megapixels
10.00
14.70
Max. image resolution
3648 x 2736
4416 x 3312
Sensor
Sensor type
CCD
CCD
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/1.7" (~ 7.53 x 5.64 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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1 | : | 1.49 |
(ratio) | ||
Canon PowerShot SD770 IS | Canon PowerShot SD990 IS |
Surface area:
28.46 mm² | vs | 42.47 mm² |
Difference: 14.01 mm² (49%)
SD990 IS sensor is approx. 1.49x bigger than SD770 IS sensor.
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: 0.03 µm² (1%)
A pixel on Canon SD990 IS sensor is approx. 1% bigger than a pixel on Canon SD770 IS.
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 SD770 IS
Canon SD990 IS
Total megapixels
10.30
Effective megapixels
10.00
14.70
Optical zoom
3x
3.7x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, High Auto, 80 ,100, 200, 400, 800, 1600
Auto, 80 ,100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
30 cm
50 cm
Macro focus range
3 cm
5 cm
Focal length (35mm equiv.)
35 - 105 mm
36 - 133 mm
Aperture priority
No
No
Max. aperture
f2.8 - f4.9
f2.8 - f5.8
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
1/1500 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/SDHC/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-6L battery
Lithium-Ion NB-5L battery
Weight
170 g
205 g
Dimensions
86 x 54 x 20 mm
98 x 62 x 28 mm
Year
2008
2008
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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 SD770 IS diagonal
The diagonal of SD770 IS 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 |
Canon SD990 IS diagonal
The diagonal of SD990 IS 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
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.
SD770 IS 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
SD990 IS sensor area
Width = 7.53 mm
Height = 5.64 mm
Surface area = 7.53 × 5.64 = 42.47 mm²
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 |
SD770 IS pixel pitch
Sensor width = 6.16 mm
Sensor resolution width = 3647 pixels
Sensor resolution width = 3647 pixels
Pixel pitch = | 6.16 | × 1000 | = 1.69 µm |
3647 |
SD990 IS pixel pitch
Sensor width = 7.53 mm
Sensor resolution width = 4438 pixels
Sensor resolution width = 4438 pixels
Pixel pitch = | 7.53 | × 1000 | = 1.7 µm |
4438 |
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 |
SD770 IS pixel area
Pixel pitch = 1.69 µm
Pixel area = 1.69² = 2.86 µm²
Pixel area = 1.69² = 2.86 µm²
SD990 IS pixel area
Pixel pitch = 1.7 µm
Pixel area = 1.7² = 2.89 µm²
Pixel area = 1.7² = 2.89 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 |
SD770 IS pixel density
Sensor resolution width = 3647 pixels
Sensor width = 0.616 cm
Pixel density = (3647 / 0.616)² / 1000000 = 35.05 MP/cm²
Sensor width = 0.616 cm
Pixel density = (3647 / 0.616)² / 1000000 = 35.05 MP/cm²
SD990 IS pixel density
Sensor resolution width = 4438 pixels
Sensor width = 0.753 cm
Pixel density = (4438 / 0.753)² / 1000000 = 34.74 MP/cm²
Sensor width = 0.753 cm
Pixel density = (4438 / 0.753)² / 1000000 = 34.74 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
SD770 IS sensor resolution
Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 10.00
Resolution horizontal: X × r = 2742 × 1.33 = 3647
Resolution vertical: X = 2742
Sensor resolution = 3647 x 2742
Sensor height = 4.62 mm
Effective megapixels = 10.00
r = 6.16/4.62 = 1.33 |
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Resolution vertical: X = 2742
Sensor resolution = 3647 x 2742
SD990 IS sensor resolution
Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 14.70
Resolution horizontal: X × r = 3312 × 1.34 = 4438
Resolution vertical: X = 3312
Sensor resolution = 4438 x 3312
Sensor height = 5.64 mm
Effective megapixels = 14.70
r = 7.53/5.64 = 1.34 |
|
Resolution vertical: X = 3312
Sensor resolution = 4438 x 3312
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 |
SD770 IS crop factor
Sensor diagonal in mm = 7.70 mm
Crop factor = | 43.27 | = 5.62 |
7.70 |
SD990 IS 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).
SD770 IS equivalent aperture
Crop factor = 5.62
Aperture = f2.8 - f4.9
35-mm equivalent aperture = (f2.8 - f4.9) × 5.62 = f15.7 - f27.5
Aperture = f2.8 - f4.9
35-mm equivalent aperture = (f2.8 - f4.9) × 5.62 = f15.7 - f27.5
SD990 IS equivalent aperture
Crop factor = 4.6
Aperture = f2.8 - f5.8
35-mm equivalent aperture = (f2.8 - f5.8) × 4.6 = f12.9 - f26.7
Aperture = f2.8 - f5.8
35-mm equivalent aperture = (f2.8 - f5.8) × 4.6 = f12.9 - f26.7
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If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.