Canon EOS Digital Rebel XSi vs. Canon EOS 6D Mark II

Comparison

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EOS Digital Rebel XSi image
vs
EOS 6D Mark II image
Canon EOS Digital Rebel XSi Canon EOS 6D Mark II
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Megapixels
12.20
26.20
Max. image resolution
4272 x 2848
6240 x 4160

Sensor

Sensor type
CMOS
CMOS
Sensor size
22.2 x 14.8 mm
35.9 x 24 mm
Sensor resolution
4278 x 2852
6269 x 4179
Diagonal
26.68 mm
43.18 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 : 2.62
(ratio)
Canon EOS Digital Rebel XSi Canon EOS 6D Mark II
Surface area:
328.56 mm² vs 861.60 mm²
Difference: 533.04 mm² (162%)
6D Mark II sensor is approx. 2.62x bigger than Digital Rebel XSi sensor.
Note: You are comparing sensors of very different generations. There is a gap of 9 years between Canon Digital Rebel XSi (2008) and Canon 6D Mark II (2017). Nine years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
5.19 µm
5.73 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: 0.54 µm (10%)
Pixel pitch of 6D Mark II is approx. 10% higher than pixel pitch of Digital Rebel XSi.
Pixel area
26.94 µm²
32.83 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: 5.89 µm² (22%)
A pixel on Canon 6D Mark II sensor is approx. 22% bigger than a pixel on Canon Digital Rebel XSi.
Pixel density
3.71 MP/cm²
3.05 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: 0.66 µm (22%)
Canon Digital Rebel XSi has approx. 22% higher pixel density than Canon 6D Mark II.
To learn about the accuracy of these numbers, click here.



Specs

Canon Digital Rebel XSi
Canon 6D Mark II
Crop factor
1.62
1
Total megapixels
12.40
27.10
Effective megapixels
12.20
26.20
Optical zoom
 
Digital zoom
No
ISO sensitivity
Auto, 100, 200, 400, 800, 1600
Auto, 100-40000 (expandable to 50-102400)
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, Spot
Multi, Center-weighted, Spot, Partial
Exposure compensation
±2 EV (in 1/3 EV, 1/2 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 (pentaprism)
White balance presets
6
6
Screen size
3"
3"
Screen resolution
230,000 dots
1,040,000 dots
Video capture
Max. video resolution
1920x1080 (60p/50p/30p/25p/24p)
Storage types
SDHC, Secure Digital
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
NB-4L Li-ion battery
LP-E6N lithium-ion battery
Weight
524 g
765 g
Dimensions
129 x 98 x 62 mm
144 x 110.5 x 74.8 mm
Year
2008
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 XSi diagonal

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

Canon 6D Mark II diagonal

w = 35.90 mm
h = 24.00 mm
Diagonal =  35.90² + 24.00²   = 43.18 mm


Surface area

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

Digital Rebel XSi sensor area

Width = 22.20 mm
Height = 14.80 mm

Surface area = 22.20 × 14.80 = 328.56 mm²

6D Mark II sensor area

Width = 35.90 mm
Height = 24.00 mm

Surface area = 35.90 × 24.00 = 861.60 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 XSi pixel pitch

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

6D Mark II pixel pitch

Sensor width = 35.90 mm
Sensor resolution width = 6269 pixels
Pixel pitch =   35.90  × 1000  = 5.73 µm
6269


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 XSi pixel area

Pixel pitch = 5.19 µm

Pixel area = 5.19² = 26.94 µm²

6D Mark II pixel area

Pixel pitch = 5.73 µm

Pixel area = 5.73² = 32.83 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 XSi pixel density

Sensor resolution width = 4278 pixels
Sensor width = 2.22 cm

Pixel density = (4278 / 2.22)² / 1000000 = 3.71 MP/cm²

6D Mark II pixel density

Sensor resolution width = 6269 pixels
Sensor width = 3.59 cm

Pixel density = (6269 / 3.59)² / 1000000 = 3.05 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 XSi 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

6D Mark II sensor resolution

Sensor width = 35.90 mm
Sensor height = 24.00 mm
Effective megapixels = 26.20
r = 35.90/24.00 = 1.5
X =  26.20 × 1000000  = 4179
1.5
Resolution horizontal: X × r = 4179 × 1.5 = 6269
Resolution vertical: X = 4179

Sensor resolution = 6269 x 4179


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 XSi crop factor

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

6D Mark II crop factor

Sensor diagonal in mm = 43.18 mm
Crop factor =   43.27  = 1
43.18

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

Crop factor for Canon Digital Rebel XSi is 1.62

6D Mark II 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 6D Mark II, take the aperture of the lens you're using and multiply it with crop factor.

Since crop factor for Canon 6D Mark II is 1, the equivalent aperture is aperture.

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