Canon EOS Digital Rebel vs. Canon EOS 1100D

Comparison

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EOS Digital Rebel image
vs
EOS 1100D image
Canon EOS Digital Rebel Canon EOS 1100D
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Megapixels
6.30
12.20
Max. image resolution
3072 x 2048
4272 x 2848

Sensor

Sensor type
CMOS
CMOS
Sensor size
22.7 x 15.1 mm
22.2 x 14.8 mm
Sensor resolution
3074 x 2049
4278 x 2852
Diagonal
27.26 mm
26.68 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 »

Actual sensor size

Note: Actual size is set to screen → change »
vs
1.04 : 1
(ratio)
Canon EOS Digital Rebel Canon EOS 1100D
Surface area:
342.77 mm² vs 328.56 mm²
Difference: 14.21 mm² (4%)
Digital Rebel sensor is slightly bigger than 1100D sensor (only 4% difference).
Note: You are comparing sensors of very different generations. There is a gap of 8 years between Canon Digital Rebel (2003) and Canon 1100D (2011). Eight years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
7.38 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.
Difference: 2.19 µm (42%)
Pixel pitch of Digital Rebel is approx. 42% higher than pixel pitch of 1100D.
Pixel area
54.46 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:
vs
Pixel area difference: 27.52 µm² (102%)
A pixel on Canon Digital Rebel sensor is approx. 102% bigger than a pixel on Canon 1100D.
Pixel density
1.83 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.
Difference: 1.88 µm (103%)
Canon 1100D has approx. 103% higher pixel density than Canon Digital Rebel.
To learn about the accuracy of these numbers, click here.



Specs

Canon Digital Rebel
Canon 1100D
Crop factor
1.59
1.62
Total megapixels
6.34
12.60
Effective megapixels
6.30
12.20
Optical zoom
Digital zoom
No
No
ISO sensitivity
Auto, 100, 200, 400, 800, 1600
Auto, 100, 200, 400, 800, 1600, 3200, 6400
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Max. aperture (35mm equiv.)
n/a
n/a
Metering
Centre weighted, Matrix, Spot
Multi, Center-weighted, Partial
Exposure compensation
±2 EV (in 1/3 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
30 sec
30 sec
Max. shutter speed
1/4000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (pentamirror)
Optical
White balance presets
6
6
Screen size
1.8"
2.7"
Screen resolution
118,000 dots
230,000 dots
Video capture
Max. video resolution
1280x720 (30p/25p)
Storage types
CompactFlash type I, CompactFlash type II, Microdrive
SDHC, SDXC, Secure Digital
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Canon 1100mAh Li-Ion
Lithium-Ion LP-E10 rechargeable battery
Weight
645 g
495 g
Dimensions
142 x 99 x 73 mm
129.9 x 99.7 x 77.9 mm
Year
2003
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 Digital Rebel diagonal

w = 22.70 mm
h = 15.10 mm
Diagonal =  22.70² + 15.10²   = 27.26 mm

Canon 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.

Digital Rebel sensor area

Width = 22.70 mm
Height = 15.10 mm

Surface area = 22.70 × 15.10 = 342.77 mm²

1100D sensor 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

Digital Rebel pixel pitch

Sensor width = 22.70 mm
Sensor resolution width = 3074 pixels
Pixel pitch =   22.70  × 1000  = 7.38 µm
3074

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

Digital Rebel pixel area

Pixel pitch = 7.38 µm

Pixel area = 7.38² = 54.46 µm²

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

One could also use this formula:
Pixel density =   effective megapixels × 1000000  / 10000
sensor surface area in mm²

Digital Rebel pixel density

Sensor resolution width = 3074 pixels
Sensor width = 2.27 cm

Pixel density = (3074 / 2.27)² / 1000000 = 1.83 MP/cm²

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.

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

Digital Rebel sensor resolution

Sensor width = 22.70 mm
Sensor height = 15.10 mm
Effective megapixels = 6.30
r = 22.70/15.10 = 1.5
X =  6.30 × 1000000  = 2049
1.5
Resolution horizontal: X × r = 2049 × 1.5 = 3074
Resolution vertical: X = 2049

Sensor resolution = 3074 x 2049

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


Digital Rebel crop factor

Sensor diagonal in mm = 27.26 mm
Crop factor =   43.27  = 1.59
27.26

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).

Digital Rebel 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 Digital Rebel, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon Digital Rebel is 1.59

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 1100D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon 1100D is 1.62

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