Canon EOS Rebel SL1 / 100D vs. Canon EOS Rebel T2i / 550D

Comparison

EOS Rebel SL1 / 100D image
vs.
EOS Rebel T2i / 550D image

 

Canon EOS Rebel SL1 / 100D Canon EOS Rebel T2i / 550D
Megapixels
18.00 18.00
Max. resolution
5184 x 3456 5184 x 3456
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
CMOS CMOS
Sensor size
22.3 x 14.9 mm 22.3 x 14.9 mm
Sensor resolution
5196 x 3464  5196 x 3464 
Diagonal
26.82 mm  26.82 mm 
Surface area
332.27 mm²  332.27 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 Rebel SL1 / 100D
vs.
Canon EOS Rebel T2i / 550D
 
Surface area:
Canon EOS Rebel SL1 / 100D
Canon EOS Rebel T2i / 550D
Difference: 0 mm² (0%)
Canon EOS Rebel SL1 / 100D and Canon EOS Rebel T2i / 550D have the same surface area.
Note: You are comparing cameras of different generations. There is a 3 year gap between Canon EOS Rebel SL1 / 100D (2013) and Canon EOS Rebel T2i / 550D (2010). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
4.29 µm  4.29 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 Rebel SL1 / 100D
Canon EOS Rebel T2i / 550D
Difference: 0 µm (0%)
Canon EOS Rebel SL1 / 100D and Canon EOS Rebel T2i / 550D have the same pixel pitch.
Pixel area
18.4 µm²  18.4 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 Rebel SL1 / 100D
vs.
Canon EOS Rebel T2i / 550D
Pixel area difference: 0 µm² (0%)
Canon EOS Rebel SL1 / 100D and Canon EOS Rebel T2i / 550D have the same pixel area.
Pixel density
5.43 MP/cm²  5.43 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 Rebel SL1 / 100D
Canon EOS Rebel T2i / 550D
Difference: 0 MP/cm² (0%)
Canon EOS Rebel SL1 / 100D and Canon EOS Rebel T2i / 550D have the same pixel density.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
1.61  1.61 
Total megapixels
18.50 18.70
Effective megapixels
18.00 18.00
Optical zoom
n/a n/a
Digital zoom
n/a No
Iso
Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800 (25600 with boost) Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800 (with boost)
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, Partial 63-zone Evaluative, Centre weighted, Evaluative, Spot
Exposure compensation
±5 (at 1/3 EV, 1/2 EV steps) -5EV - +5EV with 1/3 or 1/2 step
Shutter priority
Yes Yes
Min. shutter speed
30 sec 30 sec
Max. shutter speed
1/4000 sec 1/4000 sec
Flash modes
Auto, On, Off, Red-eye Auto, On, Off, Red-eye
Built-in flash
Yes Yes
External flash
Yes Yes
Viewfinder
Optical (pentamirror) Optical
White balance presets
6 6
LCD display
Yes Yes
LCD size
3" 3"
LCD resolution
1,040,000 1,040,000
Min. image resolution
720 x 480 2592 x 1728
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 LP-E12 rechargeable battery & charger Li-Ion
Weight
407 g 530 g
Dimensions
116.8 x 90.7 x 69.4 mm 128.8 x 97.5 x 75.3 mm
Year
2013 2010



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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 Rebel SL1 / 100D diagonal

w = 22.30 mm
h = 14.90 mm
Diagonal =  22.30² + 14.90²   = 26.82 mm

Canon EOS Rebel T2i / 550D diagonal

w = 22.30 mm
h = 14.90 mm
Diagonal =  22.30² + 14.90²   = 26.82 mm


Surface area

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

Canon EOS Rebel SL1 / 100D surface area

Width = 22.30 mm
Height = 14.90 mm

Surface area = 22.30 × 14.90 = 332.27 mm²

Canon EOS Rebel T2i / 550D surface area

Width = 22.30 mm
Height = 14.90 mm

Surface area = 22.30 × 14.90 = 332.27 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 Rebel SL1 / 100D pixel pitch

Sensor width = 22.30 mm
Sensor resolution width = 5196 pixels
Pixel pitch =   22.30  × 1000  = 4.29 µm
5196

Canon EOS Rebel T2i / 550D pixel pitch

Sensor width = 22.30 mm
Sensor resolution width = 5196 pixels
Pixel pitch =   22.30  × 1000  = 4.29 µm
5196


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 Rebel SL1 / 100D pixel area

Pixel pitch = 4.29 µm

Pixel area = 4.29² = 18.4 µm²

Canon EOS Rebel T2i / 550D pixel area

Pixel pitch = 4.29 µm

Pixel area = 4.29² = 18.4 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 Rebel SL1 / 100D pixel density

Sensor resolution width = 5196 pixels
Sensor width = 2.23 cm

Pixel density = (5196 / 2.23)² / 1000000 = 5.43 MP/cm²

Canon EOS Rebel T2i / 550D pixel density

Sensor resolution width = 5196 pixels
Sensor width = 2.23 cm

Pixel density = (5196 / 2.23)² / 1000000 = 5.43 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 Rebel SL1 / 100D sensor resolution

Sensor width = 22.30 mm
Sensor height = 14.90 mm
Effective megapixels = 18.00
r = 22.30/14.90 = 1.5
X =  18.00 × 1000000  = 3464
1.5
Resolution horizontal: X × r = 3464 × 1.5 = 5196
Resolution vertical: X = 3464

Sensor resolution = 5196 x 3464

Canon EOS Rebel T2i / 550D sensor resolution

Sensor width = 22.30 mm
Sensor height = 14.90 mm
Effective megapixels = 18.00
r = 22.30/14.90 = 1.5
X =  18.00 × 1000000  = 3464
1.5
Resolution horizontal: X × r = 3464 × 1.5 = 5196
Resolution vertical: X = 3464

Sensor resolution = 5196 x 3464


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 Rebel SL1 / 100D crop factor

Sensor diagonal in mm = 26.82 mm
Crop factor =   43.27  = 1.61
26.82

Canon EOS Rebel T2i / 550D crop factor

Sensor diagonal in mm = 26.82 mm
Crop factor =   43.27  = 1.61
26.82

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 Rebel SL1 / 100D 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 SL1 / 100D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon EOS Rebel SL1 / 100D is 1.61

Canon EOS Rebel T2i / 550D 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 T2i / 550D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon EOS Rebel T2i / 550D is 1.61


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