BenQ DC E300 vs. Canon PowerShot A420
Comparison
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| BenQ DC E300 | Canon PowerShot A420 | ||||
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Megapixels
3.14
4.00
Max. image resolution
2048 x 1536
2272 x 1704
Sensor
Sensor type
CCD
CCD
Sensor size
1/2" (~ 6.4 x 4.8 mm)
1/3" (~ 4.8 x 3.6 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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| BenQ DC E300 | Canon PowerShot A420 | |
Surface area:
| 30.72 mm² | vs | 17.28 mm² |
Difference: 13.44 mm² (78%)
DC E300 sensor is approx. 1.78x bigger than A420 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: 5.47 µm² (126%)
A pixel on BenQ DC E300 sensor is approx. 126% bigger than a pixel on Canon A420.
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
BenQ DC E300
Canon A420
Total megapixels
4.10
Effective megapixels
4.00
Optical zoom
No
3.2x
Digital zoom
Yes
Yes
ISO sensitivity
Auto
Auto, 64, 100, 200, 400
RAW
Manual focus
Normal focus range
160 cm
47 cm
Macro focus range
40 cm
1 cm
Focal length (35mm equiv.)
39 - 125 mm
Aperture priority
No
No
Max. aperture
f2.8 - f5.1
Metering
Centre weighted, Matrix, Spot
Exposure compensation
±1.5 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
1/7 sec
1 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
Optical (tunnel)
White balance presets
6
Screen size
1.5"
1.8"
Screen resolution
77,000 dots
Video capture
Max. video resolution
Storage types
MultiMedia, Secure Digital
USB
USB 1.1
USB 1.0
HDMI
Wireless
GPS
Battery
AA (2) batteries (NiMH recommended)
Weight
82 g
192 g
Dimensions
89.5 x 56 x 24 mm
103 x 52 x 40 mm
Year
2005
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 |
BenQ DC E300 diagonal
The diagonal of DC E300 sensor is not 1/2 or 0.5" (12.7 mm) as you might expect, but approximately two thirds of
that value - 8 mm. If you want to know why, see
sensor sizes.
w = 6.40 mm
h = 4.80 mm
w = 6.40 mm
h = 4.80 mm
| Diagonal = √ | 6.40² + 4.80² | = 8.00 mm |
Canon A420 diagonal
The diagonal of A420 sensor is not 1/3 or 0.33" (8.5 mm) as you might expect, but approximately two thirds of
that value - 6 mm. If you want to know why, see
sensor sizes.
w = 4.80 mm
h = 3.60 mm
w = 4.80 mm
h = 3.60 mm
| Diagonal = √ | 4.80² + 3.60² | = 6.00 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
DC E300 sensor area
Width = 6.40 mm
Height = 4.80 mm
Surface area = 6.40 × 4.80 = 30.72 mm²
Height = 4.80 mm
Surface area = 6.40 × 4.80 = 30.72 mm²
A420 sensor area
Width = 4.80 mm
Height = 3.60 mm
Surface area = 4.80 × 3.60 = 17.28 mm²
Height = 3.60 mm
Surface area = 4.80 × 3.60 = 17.28 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 |
DC E300 pixel pitch
Sensor width = 6.40 mm
Sensor resolution width = 2044 pixels
Sensor resolution width = 2044 pixels
| Pixel pitch = | 6.40 | × 1000 | = 3.13 µm |
| 2044 |
A420 pixel pitch
Sensor width = 4.80 mm
Sensor resolution width = 2306 pixels
Sensor resolution width = 2306 pixels
| Pixel pitch = | 4.80 | × 1000 | = 2.08 µm |
| 2306 |
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 |
DC E300 pixel area
Pixel pitch = 3.13 µm
Pixel area = 3.13² = 9.8 µm²
Pixel area = 3.13² = 9.8 µm²
A420 pixel area
Pixel pitch = 2.08 µm
Pixel area = 2.08² = 4.33 µm²
Pixel area = 2.08² = 4.33 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 |
DC E300 pixel density
Sensor resolution width = 2044 pixels
Sensor width = 0.64 cm
Pixel density = (2044 / 0.64)² / 1000000 = 10.2 MP/cm²
Sensor width = 0.64 cm
Pixel density = (2044 / 0.64)² / 1000000 = 10.2 MP/cm²
A420 pixel density
Sensor resolution width = 2306 pixels
Sensor width = 0.48 cm
Pixel density = (2306 / 0.48)² / 1000000 = 23.08 MP/cm²
Sensor width = 0.48 cm
Pixel density = (2306 / 0.48)² / 1000000 = 23.08 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
DC E300 sensor resolution
Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 3.14
Resolution horizontal: X × r = 1537 × 1.33 = 2044
Resolution vertical: X = 1537
Sensor resolution = 2044 x 1537
Sensor height = 4.80 mm
Effective megapixels = 3.14
| r = 6.40/4.80 = 1.33 |
|
Resolution vertical: X = 1537
Sensor resolution = 2044 x 1537
A420 sensor resolution
Sensor width = 4.80 mm
Sensor height = 3.60 mm
Effective megapixels = 4.00
Resolution horizontal: X × r = 1734 × 1.33 = 2306
Resolution vertical: X = 1734
Sensor resolution = 2306 x 1734
Sensor height = 3.60 mm
Effective megapixels = 4.00
| r = 4.80/3.60 = 1.33 |
|
Resolution vertical: X = 1734
Sensor resolution = 2306 x 1734
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 |
DC E300 crop factor
Sensor diagonal in mm = 8.00 mm
| Crop factor = | 43.27 | = 5.41 |
| 8.00 |
A420 crop factor
Sensor diagonal in mm = 6.00 mm
| Crop factor = | 43.27 | = 7.21 |
| 6.00 |
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).
DC E300 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
BenQ DC E300, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for BenQ DC E300 is 5.41
Crop factor for BenQ DC E300 is 5.41
A420 equivalent aperture
Crop factor = 7.21
Aperture = f2.8 - f5.1
35-mm equivalent aperture = (f2.8 - f5.1) × 7.21 = f20.2 - f36.8
Aperture = f2.8 - f5.1
35-mm equivalent aperture = (f2.8 - f5.1) × 7.21 = f20.2 - f36.8
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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.