Canon EOS 20D vs. Canon EOS Rebel T3 / 1100D

Comparison

EOS 20D image
vs.
EOS Rebel T3 / 1100D image

 

Canon EOS 20D Canon EOS Rebel T3 / 1100D
Megapixels
8.20 12.20
Max. resolution
3504 x 2336 4272 x 2848
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
CMOS CMOS
Sensor size
22.5 x 15 mm 22.2 x 14.8 mm
Sensor resolution
3507 x 2338  4278 x 2852 
Diagonal
27.04 mm  26.68 mm 
Surface area
337.50 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 EOS 20D
vs.
Canon EOS Rebel T3 / 1100D
 
Surface area:
Canon EOS 20D
Canon EOS Rebel T3 / 1100D
Difference: 8.94 mm² (3%)
Canon EOS 20D has approx. 3% more surface area than Canon EOS Rebel T3 / 1100D.
Note: You are comparing sensors of very different generations. There is a gap of 7 years between Canon EOS 20D (2004) and Canon EOS Rebel T3 / 1100D (2011). Seven years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
6.42 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 EOS 20D
Canon EOS Rebel T3 / 1100D
Difference: 1.23 µm (24%)
Pixel pitch of Canon EOS 20D is approx. 24% higher than pixel pitch of Canon EOS Rebel T3 / 1100D.
Pixel area
41.22 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 EOS 20D
vs.
Canon EOS Rebel T3 / 1100D
Pixel area difference: 14.28 µm² (53%)
A pixel on Canon EOS 20D sensor is approx. 53% bigger than a pixel on Canon EOS Rebel T3 / 1100D.
Pixel density
2.43 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 EOS 20D
Canon EOS Rebel T3 / 1100D
Difference: 1.28 MP/cm² (53%)
Canon EOS Rebel T3 / 1100D has approx. 53% higher pixel density than Canon EOS 20D.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
1.6  1.62 
Total megapixels
8.50 12.60
Effective megapixels
8.20 12.20
Optical zoom
n/a n/a
Digital zoom
No No
Iso
100, 200, 400, 800, 1600, 3200 (H) 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
n/a n/a
Focal length (35mm equiv.)
n/a n/a
Aperture priority
Yes Yes
Aperture
n/a n/a
Aperture (35mm equiv.)
n/a  n/a 
Metering
Multi, Center-weighted, Spot Multi, Center-weighted, Partial
Exposure compensation
±2 EV (at 1/3 EV, 1/2 EV steps) ±5 EV (at 1/3 EV, 1/2 EV steps)
Shutter priority
Yes Yes
Min. shutter speed
30 sec Bulb+30 sec
Max. shutter speed
1/8000 sec 1/4000 sec
Flash modes
Auto, On, Red-eye reduction, Off Auto, On, Off, Red-eye
Built-in flash
Yes Yes
External flash
Yes Yes
Viewfinder
Optical (pentaprism) Optical
White balance presets
6 6
LCD display
Yes Yes
LCD size
1.8" 2.7"
LCD resolution
118,000 230,000
Min. image resolution
1728 x 1152 720 x 480
Selftimer
Yes Yes
Storage types
Compact Flash (Type I or II) SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec) USB 2.0 Hi-Speed
Batteries
Canon Lithium-Ion & charger Lithium-Ion LP-E10 rechargeable battery & charger
Weight
770 g 495 g
Dimensions
144 x 106 x 72 mm 129.9x99.7x77.9 mm
Year
2004 2011



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Diagonal

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

Canon EOS 20D diagonal

w = 22.50 mm
h = 15.00 mm
Diagonal =  22.50² + 15.00²   = 27.04 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 EOS 20D surface area

Width = 22.50 mm
Height = 15.00 mm

Surface area = 22.50 × 15.00 = 337.50 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 EOS 20D pixel pitch

Sensor width = 22.50 mm
Sensor resolution width = 3507 pixels
Pixel pitch =   22.50  × 1000  = 6.42 µm
3507

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 EOS 20D pixel area

Pixel pitch = 6.42 µm

Pixel area = 6.42² = 41.22 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 EOS 20D pixel density

Sensor resolution width = 3507 pixels
Sensor width = 2.25 cm

Pixel density = (3507 / 2.25)² / 1000000 = 2.43 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 EOS 20D sensor resolution

Sensor width = 22.50 mm
Sensor height = 15.00 mm
Effective megapixels = 8.20
r = 22.50/15.00 = 1.5
X =  8.20 × 1000000  = 2338
1.5
Resolution horizontal: X × r = 2338 × 1.5 = 3507
Resolution vertical: X = 2338

Sensor resolution = 3507 x 2338

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 EOS 20D crop factor

Sensor diagonal in mm = 27.04 mm
Crop factor =   43.27  = 1.6
27.04

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 EOS 20D 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 20D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon EOS 20D is 1.6

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


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