Canon EOS Rebel T8i vs. Canon EOS Rebel T6s

Comparison

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EOS Rebel T8i image
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EOS Rebel T6s image
Canon EOS Rebel T8i Canon EOS Rebel T6s
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Megapixels
24.10
24.20
Max. image resolution
6000 x 4000
6000 x 4000

Sensor

Sensor type
CMOS
CMOS
Sensor size
22.3 x 14.9 mm
22.3 x 14.9 mm
Sensor resolution
6012 x 4008
6026 x 4017
Diagonal
26.82 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
(ratio)
Canon EOS Rebel T8i Canon EOS Rebel T6s
Surface area:
332.27 mm² vs 332.27 mm²
Difference: 0 mm² (0%)
Rebel T8i and Rebel T6s sensors are the same size.
Note: You are comparing cameras of different generations. There is a 5 year gap between Canon Rebel T8i ( 2020) and Canon Rebel T6s (2015). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
3.71 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: 0.01 µm (0.3%)
Pixel pitch of Rebel T8i is approx. 0.3% higher than pixel pitch of Rebel T6s.
Pixel area
13.76 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: 0.07 µm² (0.5%)
A pixel on Canon Rebel T8i sensor is approx. 0.5% bigger than a pixel on Canon Rebel T6s.
Pixel density
7.27 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: 0.03 µm (0.4%)
Canon Rebel T6s has approx. 0.4% higher pixel density than Canon Rebel T8i.
To learn about the accuracy of these numbers, click here.



Specs

Canon Rebel T8i
Canon Rebel T6s
Crop factor
1.61
1.61
Total megapixels
25.80
24.70
Effective megapixels
24.10
24.20
Optical zoom
Digital zoom
ISO sensitivity
Auto, 100-25600 (expandable to 51200)
Auto, 100 - 12800 (expands to 25600)
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
Multi, Center-weighted, Spot, Partial
Multi, Center-weighted, Spot, Partial
Exposure compensation
±5 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
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
8
Screen size
3"
3"
Screen resolution
1,040,000 dots
1,040,000 dots
Video capture
Max. video resolution
3840x2160 (25p)
1920x1080 (30p/25p/24p)
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC (UHS-I)
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
LP-E17 lithium-ion battery
Battery Pack LP-E17
Weight
515 g
565 g
Dimensions
131 x 102.6 x 76.2 mm
131.9 x 100.9 x 77.8 mm
Year
2020
2015




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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 Rebel T8i diagonal

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

Canon Rebel T6s 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.

Rebel T8i sensor area

Width = 22.30 mm
Height = 14.90 mm

Surface area = 22.30 × 14.90 = 332.27 mm²

Rebel T6s 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

Rebel T8i pixel pitch

Sensor width = 22.30 mm
Sensor resolution width = 6012 pixels
Pixel pitch =   22.30  × 1000  = 3.71 µm
6012

Rebel T6s 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

Rebel T8i pixel area

Pixel pitch = 3.71 µm

Pixel area = 3.71² = 13.76 µm²

Rebel T6s 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

Rebel T8i pixel density

Sensor resolution width = 6012 pixels
Sensor width = 2.23 cm

Pixel density = (6012 / 2.23)² / 1000000 = 7.27 MP/cm²

Rebel T6s 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

Rebel T8i sensor resolution

Sensor width = 22.30 mm
Sensor height = 14.90 mm
Effective megapixels = 24.10
r = 22.30/14.90 = 1.5
X = √  24.10 × 1000000  = 4008
1.5
Resolution horizontal: X × r = 4008 × 1.5 = 6012
Resolution vertical: X = 4008

Sensor resolution = 6012 x 4008

Rebel T6s 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


Rebel T8i crop factor

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

Rebel T6s 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).

Rebel T8i 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 T8i, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon Rebel T8i is 1.61

Rebel T6s 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 T6s, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon Rebel T6s is 1.61

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