Canon EOS Digital Rebel XT vs. Canon EOS Rebel SL2

Comparison

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EOS Digital Rebel XT image
vs
EOS Rebel SL2 image
Canon EOS Digital Rebel XT Canon EOS Rebel SL2
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Megapixels
8.00
24.20
Max. image resolution
3456 x 2304
6000 x 4000

Sensor

Sensor type
CMOS
CMOS
Sensor size
22.2 x 14.8 mm
22.3 x 14.9 mm
Sensor resolution
3464 x 2309
6026 x 4017
Diagonal
26.68 mm
26.82 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 : 1.01
(ratio)
Canon EOS Digital Rebel XT Canon EOS Rebel SL2
Surface area:
328.56 mm² vs 332.27 mm²
Difference: 3.71 mm² (1%)
Rebel SL2 sensor is slightly bigger than Digital Rebel XT sensor (only 1% difference).
Note: You are comparing sensors of vastly different generations. There is a gap of 12 years between Canon Digital Rebel XT (2005) and Canon Rebel SL2 (2017). Twelve years is a huge amount of time, technology wise, resulting in newer sensor being much more efficient than the older one.
Pixel pitch
6.41 µm
3.7 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: 2.71 µm (73%)
Pixel pitch of Digital Rebel XT is approx. 73% higher than pixel pitch of Rebel SL2.
Pixel area
41.09 µm²
13.69 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: 27.4 µm² (200%)
A pixel on Canon Digital Rebel XT sensor is approx. 200% bigger than a pixel on Canon Rebel SL2.
Pixel density
2.43 MP/cm²
7.3 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: 4.87 µm (200%)
Canon Rebel SL2 has approx. 200% higher pixel density than Canon Digital Rebel XT.
To learn about the accuracy of these numbers, click here.



Specs

Canon Digital Rebel XT
Canon Rebel SL2
Crop factor
1.62
1.61
Total megapixels
8.20
25.80
Effective megapixels
8.00
24.20
Optical zoom
Digital zoom
No
ISO sensitivity
Auto, 100, 200, 400, 800, 1600
Auto, 100-25600 (expandable to 51200)
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, Evaluative, Multi-pattern
Multi, Center-weighted, Spot, 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
Bulb+30 sec
30 sec
Max. shutter speed
1/4000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (pentamirror)
Optical (pentamirror)
White balance presets
6
6
Screen size
1.8"
3"
Screen resolution
115,000 dots
1,040,000 dots
Video capture
Max. video resolution
1920x1080 (60p/50p/30p/25p/24p)
Storage types
CompactFlash type I, CompactFlash type II, Microdrive
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion NB-3L battery
LP-E17 lithium-ion battery
Weight
540 g
453 g
Dimensions
126.5 x 94.2 x 64 mm
122.4 x 92.6 x 69.8 mm
Year
2005
2017




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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 XT diagonal

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

Canon Rebel SL2 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.

Digital Rebel XT sensor area

Width = 22.20 mm
Height = 14.80 mm

Surface area = 22.20 × 14.80 = 328.56 mm²

Rebel SL2 sensor 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

Digital Rebel XT pixel pitch

Sensor width = 22.20 mm
Sensor resolution width = 3464 pixels
Pixel pitch =   22.20  × 1000  = 6.41 µm
3464

Rebel SL2 pixel pitch

Sensor width = 22.30 mm
Sensor resolution width = 6026 pixels
Pixel pitch =   22.30  × 1000  = 3.7 µm
6026


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 XT pixel area

Pixel pitch = 6.41 µm

Pixel area = 6.41² = 41.09 µm²

Rebel SL2 pixel area

Pixel pitch = 3.7 µm

Pixel area = 3.7² = 13.69 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 XT pixel density

Sensor resolution width = 3464 pixels
Sensor width = 2.22 cm

Pixel density = (3464 / 2.22)² / 1000000 = 2.43 MP/cm²

Rebel SL2 pixel density

Sensor resolution width = 6026 pixels
Sensor width = 2.23 cm

Pixel density = (6026 / 2.23)² / 1000000 = 7.3 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 XT sensor resolution

Sensor width = 22.20 mm
Sensor height = 14.80 mm
Effective megapixels = 8.00
r = 22.20/14.80 = 1.5
X =  8.00 × 1000000  = 2309
1.5
Resolution horizontal: X × r = 2309 × 1.5 = 3464
Resolution vertical: X = 2309

Sensor resolution = 3464 x 2309

Rebel SL2 sensor resolution

Sensor width = 22.30 mm
Sensor height = 14.90 mm
Effective megapixels = 24.20
r = 22.30/14.90 = 1.5
X =  24.20 × 1000000  = 4017
1.5
Resolution horizontal: X × r = 4017 × 1.5 = 6026
Resolution vertical: X = 4017

Sensor resolution = 6026 x 4017


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 XT crop factor

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

Rebel SL2 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).

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

Crop factor for Canon Digital Rebel XT is 1.62

Rebel SL2 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 Rebel SL2, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon Rebel SL2 is 1.61

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