Samsung SL310W vs. Canon PowerShot G7
Comparison
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Megapixels
13.60
10.00
Max. image resolution
3648 x 2736
Sensor
Sensor type
CCD
CCD
Sensor size
1/1.72" (~ 7.44 x 5.58 mm)
1/1.8" (~ 7.11 x 5.33 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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| Samsung SL310W | Canon PowerShot G7 | |
Surface area:
| 41.52 mm² | vs | 37.90 mm² |
Difference: 3.62 mm² (10%)
SL310W sensor is approx. 1.1x bigger than G7 sensor.
Note: You are comparing cameras of different generations.
There is a 2 year gap between Samsung SL310W (2008) and Canon G7 (2006).
All things being equal, newer sensor generations generally outperform the older.
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: 0.74 µm² (24%)
A pixel on Canon G7 sensor is approx. 24% bigger than a pixel on Samsung SL310W.
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
Samsung SL310W
Canon G7
Total megapixels
10.30
Effective megapixels
10.00
Optical zoom
Yes
6x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400, 800, 1600, 3200
Auto, 80 , 100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
1 cm
Focal length (35mm equiv.)
28 - 100 mm
35 - 210 mm
Aperture priority
No
Yes
Max. aperture
f2.8 - f4.8
Metering
Centre weighted, Multi-segment, 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
8 sec
15 sec
Max. shutter speed
1/1500 sec
1/2500 sec
Built-in flash
External flash
Viewfinder
None
Optical (tunnel)
White balance presets
6
7
Screen size
2.7"
2.5"
Screen resolution
207,000 dots
Video capture
Max. video resolution
Storage types
MultiMedia, SDHC, Secure Digital
Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Li-Ion
Canon Lithium-Ion
Weight
320 g
Dimensions
106.4 x 71.9 x 42.5 mm
Year
2008
2006
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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 |
Samsung SL310W diagonal
The diagonal of SL310W sensor is not 1/1.72 or 0.58" (14.8 mm) as you might expect, but approximately two thirds of
that value - 9.3 mm. If you want to know why, see
sensor sizes.
w = 7.44 mm
h = 5.58 mm
w = 7.44 mm
h = 5.58 mm
| Diagonal = √ | 7.44² + 5.58² | = 9.30 mm |
Canon G7 diagonal
The diagonal of G7 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
w = 7.11 mm
h = 5.33 mm
| Diagonal = √ | 7.11² + 5.33² | = 8.89 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
SL310W sensor area
Width = 7.44 mm
Height = 5.58 mm
Surface area = 7.44 × 5.58 = 41.52 mm²
Height = 5.58 mm
Surface area = 7.44 × 5.58 = 41.52 mm²
G7 sensor area
Width = 7.11 mm
Height = 5.33 mm
Surface area = 7.11 × 5.33 = 37.90 mm²
Height = 5.33 mm
Surface area = 7.11 × 5.33 = 37.90 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 |
SL310W pixel pitch
Sensor width = 7.44 mm
Sensor resolution width = 4253 pixels
Sensor resolution width = 4253 pixels
| Pixel pitch = | 7.44 | × 1000 | = 1.75 µm |
| 4253 |
G7 pixel pitch
Sensor width = 7.11 mm
Sensor resolution width = 3647 pixels
Sensor resolution width = 3647 pixels
| Pixel pitch = | 7.11 | × 1000 | = 1.95 µm |
| 3647 |
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 |
SL310W pixel area
Pixel pitch = 1.75 µm
Pixel area = 1.75² = 3.06 µm²
Pixel area = 1.75² = 3.06 µm²
G7 pixel area
Pixel pitch = 1.95 µm
Pixel area = 1.95² = 3.8 µm²
Pixel area = 1.95² = 3.8 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 |
SL310W pixel density
Sensor resolution width = 4253 pixels
Sensor width = 0.744 cm
Pixel density = (4253 / 0.744)² / 1000000 = 32.68 MP/cm²
Sensor width = 0.744 cm
Pixel density = (4253 / 0.744)² / 1000000 = 32.68 MP/cm²
G7 pixel density
Sensor resolution width = 3647 pixels
Sensor width = 0.711 cm
Pixel density = (3647 / 0.711)² / 1000000 = 26.31 MP/cm²
Sensor width = 0.711 cm
Pixel density = (3647 / 0.711)² / 1000000 = 26.31 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 → |
|
Resolution horizontal: X × r
Resolution vertical: X
SL310W sensor resolution
Sensor width = 7.44 mm
Sensor height = 5.58 mm
Effective megapixels = 13.60
Resolution horizontal: X × r = 3198 × 1.33 = 4253
Resolution vertical: X = 3198
Sensor resolution = 4253 x 3198
Sensor height = 5.58 mm
Effective megapixels = 13.60
| r = 7.44/5.58 = 1.33 |
|
Resolution vertical: X = 3198
Sensor resolution = 4253 x 3198
G7 sensor resolution
Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 10.00
Resolution horizontal: X × r = 2742 × 1.33 = 3647
Resolution vertical: X = 2742
Sensor resolution = 3647 x 2742
Sensor height = 5.33 mm
Effective megapixels = 10.00
| r = 7.11/5.33 = 1.33 |
|
Resolution vertical: X = 2742
Sensor resolution = 3647 x 2742
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 |
SL310W crop factor
Sensor diagonal in mm = 9.30 mm
| Crop factor = | 43.27 | = 4.65 |
| 9.30 |
G7 crop factor
Sensor diagonal in mm = 8.89 mm
| Crop factor = | 43.27 | = 4.87 |
| 8.89 |
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).
SL310W equivalent aperture
Aperture is a lens characteristic, so it's calculated only for
fixed lens cameras. If you want to know the equivalent aperture for
Samsung SL310W, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Samsung SL310W is 4.65
Crop factor for Samsung SL310W is 4.65
G7 equivalent aperture
Crop factor = 4.87
Aperture = f2.8 - f4.8
35-mm equivalent aperture = (f2.8 - f4.8) × 4.87 = f13.6 - f23.4
Aperture = f2.8 - f4.8
35-mm equivalent aperture = (f2.8 - f4.8) × 4.87 = f13.6 - f23.4
Enter your screen size (diagonal)
My screen size is
inches
Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.