Canon PowerShot D20 vs. Canon EOS Rebel T3 / 1100D

Comparison

PowerShot D20 image
vs.
EOS Rebel T3 / 1100D image

 

Canon PowerShot D20 Canon EOS Rebel T3 / 1100D
Megapixels
12.10 12.20
Max. resolution
4000 x 3000 4272 x 2848
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
BSI CMOS CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm) 22.2 x 14.8 mm
Sensor resolution
4011 x 3016  4278 x 2852 
Diagonal
7.70 mm  26.68 mm 
Surface area
28.46 mm²  328.56 mm² 
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 »
Actual sensor sizes:
Canon PowerShot D20
vs.
Canon EOS Rebel T3 / 1100D
 
Surface area:
Canon PowerShot D20
Canon EOS Rebel T3 / 1100D
Difference: 300.1 mm² (1054%)
Canon EOS Rebel T3 / 1100D has approx. 1054% more surface area than Canon PowerShot D20.
Pixel pitch
1.54 µm  5.19 µm 
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.
Pixel pitch
Canon PowerShot D20
Canon EOS Rebel T3 / 1100D
Difference: 3.65 µm (237%)
Pixel pitch of Canon EOS Rebel T3 / 1100D is approx. 237% higher than pixel pitch of Canon PowerShot D20.
Pixel area
2.37 µm²  26.94 µm² 
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.
Relative pixel sizes:
Canon PowerShot D20
vs.
Canon EOS Rebel T3 / 1100D
Pixel area difference: 24.57 µm² (1037%)
A pixel on Canon EOS Rebel T3 / 1100D sensor is approx. 1037% bigger than a pixel on Canon PowerShot D20.
Pixel density
42.4 MP/cm²  3.71 MP/cm² 
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.
Pixel density
Canon PowerShot D20
Canon EOS Rebel T3 / 1100D
Difference: 38.69 MP/cm² (1043%)
Canon PowerShot D20 has approx. 1043% higher pixel density than Canon EOS Rebel T3 / 1100D.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
5.62  1.62 
Total megapixels
n/a 12.60
Effective megapixels
12.10 12.20
Optical zoom
5x n/a
Digital zoom
Yes No
Iso
Auto, 100, 200, 400, 800, 1600, 3200 Auto, 100, 200, 400, 800, 1600, 3200, 6400
Auto focus
Yes Yes
Manual focus
Yes Yes
Normal focus range
n/a n/a
Macro focus range
1 cm n/a
Focal length (35mm equiv.)
28 - 140 mm n/a
Aperture priority
No Yes
Aperture
f3.9 - f4.8 n/a
Aperture (35mm equiv.)
f21.9 - f27  n/a 
Metering
Multi, Center-weighted, Spot Multi, Center-weighted, Partial
Exposure compensation
±2 EV (at 1/3 EV steps) ±5 EV (at 1/3 EV, 1/2 EV steps)
Shutter priority
No Yes
Min. shutter speed
15 sec Bulb+30 sec
Max. shutter speed
1/1600 sec 1/4000 sec
Flash modes
Auto, Fill-in, Red-Eye reduction, Slow Sync, Off Auto, On, Off, Red-eye
Built-in flash
Yes Yes
External flash
No Yes
Viewfinder
None Optical
White balance presets
6 6
LCD display
Yes Yes
LCD size
3" 2.7"
LCD resolution
461,000 230,000
Min. image resolution
480 x 480 720 x 480
Selftimer
Yes Yes
Storage types
SD/SDHC/SDXC SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec) USB 2.0 Hi-Speed
Batteries
Lithium-Ion NB-6L battery & charger Lithium-Ion LP-E10 rechargeable battery & charger
Weight
228g 495 g
Dimensions
112x71x28 mm 129.9x99.7x77.9 mm
Year
2012 2011



Compare other cameras

Popular comparisons:

Choose other cameras to compare:



comments powered by Disqus

Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Canon PowerShot D20 diagonal

The diagonal of Canon PowerShot D20 image sensor is not 1/2.3 inch as you might expect, but approximately two thirds of that value. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal =  6.16² + 4.62²   = 7.70 mm

Canon EOS Rebel T3 / 1100D diagonal

w = 22.20 mm
h = 14.80 mm
Diagonal =  22.20² + 14.80²   = 26.68 mm


Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

Canon PowerShot D20 surface area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

Canon EOS Rebel T3 / 1100D surface area

Width = 22.20 mm
Height = 14.80 mm

Surface area = 22.20 × 14.80 = 328.56 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 PowerShot D20 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4011 pixels
Pixel pitch =   6.16  × 1000  = 1.54 µm
4011

Canon EOS Rebel T3 / 1100D pixel pitch

Sensor width = 22.20 mm
Sensor resolution width = 4278 pixels
Pixel pitch =   22.20  × 1000  = 5.19 µm
4278


Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:
Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:
Pixel area =   sensor surface area in mm²
effective megapixels

Canon PowerShot D20 pixel area

Pixel pitch = 1.54 µm

Pixel area = 1.54² = 2.37 µm²

Canon EOS Rebel T3 / 1100D pixel area

Pixel pitch = 5.19 µm

Pixel area = 5.19² = 26.94 µm²


Pixel density

Pixel density can be calculated with the following 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 PowerShot D20 pixel density

Sensor resolution width = 4011 pixels
Sensor width = 0.616 cm

Pixel density = (4011 / 0.616)² / 1000000 = 42.4 MP/cm²

Canon EOS Rebel T3 / 1100D pixel density

Sensor resolution width = 4278 pixels
Sensor width = 2.22 cm

Pixel density = (4278 / 2.22)² / 1000000 = 3.71 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. 22.8 × 15.5 sensor for example has a ratio of 1.47.

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    →   
X =  effective megapixels × 1000000
r
3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

Canon PowerShot D20 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 12.10
r = 6.16/4.62 = 1.33
X =  12.10 × 1000000  = 3016
1.33
Resolution horizontal: X × r = 3016 × 1.33 = 4011
Resolution vertical: X = 3016

Sensor resolution = 4011 x 3016

Canon EOS Rebel T3 / 1100D sensor resolution

Sensor width = 22.20 mm
Sensor height = 14.80 mm
Effective megapixels = 12.20
r = 22.20/14.80 = 1.5
X =  12.20 × 1000000  = 2852
1.5
Resolution horizontal: X × r = 2852 × 1.5 = 4278
Resolution vertical: X = 2852

Sensor resolution = 4278 x 2852


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 PowerShot D20 crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

Canon EOS Rebel T3 / 1100D crop factor

Sensor diagonal in mm = 26.68 mm
Crop factor =   43.27  = 1.62
26.68

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 D20 equivalent aperture

Crop factor = 5.62
Aperture = f3.9 - f4.8

35-mm equivalent aperture = (f3.9 - f4.8) × 5.62 = f21.9 - f27

Canon EOS Rebel T3 / 1100D 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 Canon EOS Rebel T3 / 1100D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon EOS Rebel T3 / 1100D is 1.62


All trademarks and product names are property of their respective owners. User comments are not the responsibility of digicamdb.com.