Canon PowerShot A400
Specs
| Brand: | Canon |
| Model: | PowerShot A400 |
| Megapixels: | 3.10 |
| Sensor: | 1/3.2" (~ 4.5 x 3.37 mm) |
| Price: | check here » |
Sensor info
Canon A400 comes with a
1/3.2" (~ 4.5 x 3.37 mm) CCD sensor, which has a diagonal of
5.62 mm (0.22") and a surface area of
15.17 mm².
If you want to know about the accuracy of these numbers,
click here.
Actual sensor size
Note: Actual size is set to screen → change »
This is the actual size of the A400 sensor: ~4.5 x 3.37 mm
The sensor has a surface area of 15.2 mm².
There are approx. 3,100,000 photosites (pixels) on this area.
Pixel pitch, which is a measure of the distance between pixels, is 2.21 µm.
Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next.
Pixel or photosite area is 4.88 µm². The larger the photosite, the more light it can capture and the more information can be recorded.
Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Canon A400 has a pixel density of 20.51 MP/cm².
These numbers are important in terms of assessing the overall quality of a digital camera. Generally, the bigger (and newer) the sensor, pixel pitch and photosite area, and the smaller the pixel density, the better the camera. If you want to see how A400 compares to other cameras, click here.
Pixel or photosite area is 4.88 µm². The larger the photosite, the more light it can capture and the more information can be recorded.
Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Canon A400 has a pixel density of 20.51 MP/cm².
These numbers are important in terms of assessing the overall quality of a digital camera. Generally, the bigger (and newer) the sensor, pixel pitch and photosite area, and the smaller the pixel density, the better the camera. If you want to see how A400 compares to other cameras, click here.
Specifications
| Brand: | Canon |
| Model: | PowerShot A400 |
| Effective megapixels: | 3.10 |
| Total megapixels: | 3.30 |
| Sensor size: | 1/3.2" (~ 4.5 x 3.37 mm) |
| Sensor type: | CCD |
| Sensor resolution: | 2038 x 1521 |
| Max. image resolution: | 2048 x 1536 |
| Crop factor: | 7.7 |
| Optical zoom: | 2.2x |
| Digital zoom: | Yes |
| ISO: | Auto, 50, 100, 200, 400 |
| RAW support: | |
| Manual focus: | |
| Normal focus range: | 50 cm |
| Macro focus range: | 5 cm |
| Focal length (35mm equiv.): | 45 - 100 mm |
| Aperture priority: | No |
| Max aperture: | f2.8 - f4.9 |
| Max. aperture (35mm equiv.): | f21.6 - f37.7 |
| Depth of field: | simulate → |
| Metering: | Multi, Center-weighted, Spot |
| Exposure Compensation: | ±2 EV (in 1/3 EV steps) |
| Shutter priority: | No |
| Min. shutter speed: | 1 sec |
| Max. shutter speed: | 1/1500 sec |
| Built-in flash: | |
| External flash: | |
| Viewfinder: | Optical (tunnel) |
| White balance presets: | 5 |
| Screen size: | 1.5" |
| Screen resolution: | 115,000 dots |
| Video capture: | |
| Storage types: | SD/MMC card |
| USB: | USB 1.0 |
| HDMI: | |
| Wireless: | |
| GPS: | |
| Battery: | AA (2) batteries (NiMH recommended) |
| Weight: | 255 g |
| Dimensions: | 107 x 53 x 37 mm |
| Year: | 2004 |
Compare A400 with another camera
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- Canon PowerShot A400 vs. Nikon Coolpix P530
- Canon PowerShot A400 vs. Nikon Coolpix L330
- Canon PowerShot A400 vs. Canon Digital IXUS 40
- Canon PowerShot A400 vs. Canon EOS 5D Mark II
- Canon PowerShot A400 vs. Sony Cyber-shot DSC-W690
Diagonal
The diagonal of A400 sensor is not 1/3.2 or 0.31" (7.9 mm) as you might expect, but approximately two thirds of
that value - 0.22" (5.62 mm). If you want to know why, see
sensor sizes.
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
Diagonal is calculated by the use of Pythagorean theorem:
| Diagonal = √ | w² + h² |
Canon A400 diagonal:
w = 4.50 mm
h = 3.37 mm
h = 3.37 mm
| Diagonal = √ | 4.50² + 3.37² | = 5.62 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
Width = 4.50 mm
Height = 3.37 mm
Surface area = 4.50 × 3.37 = 15.17 mm²
Width = 4.50 mm
Height = 3.37 mm
Surface area = 4.50 × 3.37 = 15.17 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 |
Canon A400 pixel pitch:
Sensor width = 4.50 mm
Sensor resolution width = 2038 pixels
Sensor resolution width = 2038 pixels
| Pixel pitch = | 4.50 | × 1000 | = 2.21 µm |
| 2038 |
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 |
Canon A400 pixel area:
Pixel pitch = 2.21 µm
Pixel area = 2.21² = 4.88 µm²
Pixel area = 2.21² = 4.88 µm²
Pixel density
Pixel density can be calculated with the following formula:
You could also use this formula:
| Pixel density = ( | sensor resolution width in pixels | )² / 1000000 |
| sensor width in cm |
You could also use this formula:
| Pixel density = | effective megapixels × 1000000 | / 10000 |
| sensor surface area in mm² |
Canon A400 pixel density:
Sensor resolution width = 2038 pixels
Sensor width = 0.45 cm
Pixel density = (2038 / 0.45)² / 1000000 = 20.51 MP/cm²
Sensor width = 0.45 cm
Pixel density = (2038 / 0.45)² / 1000000 = 20.51 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
Canon PowerShot A400 sensor resolution:
Sensor width = 4.50 mm
Sensor height = 3.37 mm
Effective megapixels = 3.10
Resolution horizontal: X × r = 1521 × 1.34 = 2038
Resolution vertical: X = 1521
Sensor resolution = 2038 x 1521
Sensor height = 3.37 mm
Effective megapixels = 3.10
| r = 4.50/3.37 = 1.34 |
|
Resolution vertical: X = 1521
Sensor resolution = 2038 x 1521
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 |
Canon A400 crop factor:
Sensor diagonal = 5.62 mm
| Crop factor = | 43.27 | = 7.7 |
| 5.62 |
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).
Canon PowerShot A400 equivalent aperture:
Crop factor = 7.7
Aperture = f2.8 - f4.9
35-mm equivalent aperture = (f2.8 - f4.9) × 7.7 = f21.6 - f37.7
Aperture = f2.8 - f4.9
35-mm equivalent aperture = (f2.8 - f4.9) × 7.7 = f21.6 - f37.7
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.