Rollei X-8 Sports vs. Canon EOS Rebel T7i
Comparison
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| Rollei X-8 Sports | Canon EOS Rebel T7i | ||||
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Megapixels
8.00
24.20
Max. image resolution
3264 x 2448
6000 x 4000
Sensor
Sensor type
CCD
CMOS
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
22.3 x 14.9 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 »
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 »
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| 1 | : | 13.38 |
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| Rollei X-8 Sports | Canon EOS Rebel T7i | |
Surface area:
| 24.84 mm² | vs | 332.27 mm² |
Difference: 307.43 mm² (1238%)
Rebel T7i sensor is approx. 13.38x bigger than X-8 Sports sensor.
Note: You are comparing sensors of very different generations.
There is a gap of 9 years between Rollei X-8 Sports (2008) and Canon Rebel T7i (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 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.
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 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.
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: 10.59 µm² (342%)
A pixel on Canon Rebel T7i sensor is approx. 342% bigger than a pixel on Rollei X-8 Sports.
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.
Higher pixel density means smaller pixels and lower pixel density means larger pixels.
To learn about the accuracy of these numbers,
click here.
Specs
Rollei X-8 Sports
Canon Rebel T7i
Total megapixels
25.80
Effective megapixels
24.20
Optical zoom
Yes
Digital zoom
Yes
ISO sensitivity
Auto, 100 - 1600
Auto, 100-25600 (expandable to 51200)
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
38 - 114 mm
Aperture priority
No
Yes
Max. aperture
f2.9 - f5.2
Metering
Centre weighted
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
No
Yes
Min. shutter speed
30 sec
Max. shutter speed
1/4000 sec
Built-in flash
External flash
Viewfinder
None
Optical (pentamirror)
White balance presets
6
Screen size
2.5"
3"
Screen resolution
230,000 dots
1,040,000 dots
Video capture
Max. video resolution
1920x1080 (60p/30p/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
Li-Ion
LP-E17 lithium-ion battery
Weight
158 g
532 g
Dimensions
95 x 59.5 x 20.5 mm
131 x 99.9 x 76.2 mm
Year
2008
2017
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
| Diagonal = √ | w² + h² |
Rollei X-8 Sports diagonal
The diagonal of X-8 Sports sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of
that value - 7.19 mm. If you want to know why, see
sensor sizes.
w = 5.75 mm
h = 4.32 mm
w = 5.75 mm
h = 4.32 mm
| Diagonal = √ | 5.75² + 4.32² | = 7.19 mm |
Canon Rebel T7i diagonal
w = 22.30 mm
h = 14.90 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.
X-8 Sports sensor area
Width = 5.75 mm
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 mm²
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 mm²
Rebel T7i sensor area
Width = 22.30 mm
Height = 14.90 mm
Surface area = 22.30 × 14.90 = 332.27 mm²
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 |
X-8 Sports pixel pitch
Sensor width = 5.75 mm
Sensor resolution width = 3262 pixels
Sensor resolution width = 3262 pixels
| Pixel pitch = | 5.75 | × 1000 | = 1.76 µm |
| 3262 |
Rebel T7i pixel pitch
Sensor width = 22.30 mm
Sensor resolution width = 6026 pixels
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:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
| Pixel area = | sensor surface area in mm² |
| effective megapixels |
X-8 Sports pixel area
Pixel pitch = 1.76 µm
Pixel area = 1.76² = 3.1 µm²
Pixel area = 1.76² = 3.1 µm²
Rebel T7i pixel area
Pixel pitch = 3.7 µm
Pixel area = 3.7² = 13.69 µm²
Pixel area = 3.7² = 13.69 µm²
Pixel density
Pixel density can be calculated with the following formula:
One could also use this 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 |
X-8 Sports pixel density
Sensor resolution width = 3262 pixels
Sensor width = 0.575 cm
Pixel density = (3262 / 0.575)² / 1000000 = 32.18 MP/cm²
Sensor width = 0.575 cm
Pixel density = (3262 / 0.575)² / 1000000 = 32.18 MP/cm²
Rebel T7i pixel density
Sensor resolution width = 6026 pixels
Sensor width = 2.23 cm
Pixel density = (6026 / 2.23)² / 1000000 = 7.3 MP/cm²
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:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
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 → |
|
Resolution horizontal: X × r
Resolution vertical: X
X-8 Sports sensor resolution
Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 8.00
Resolution horizontal: X × r = 2453 × 1.33 = 3262
Resolution vertical: X = 2453
Sensor resolution = 3262 x 2453
Sensor height = 4.32 mm
Effective megapixels = 8.00
| r = 5.75/4.32 = 1.33 |
|
Resolution vertical: X = 2453
Sensor resolution = 3262 x 2453
Rebel T7i sensor resolution
Sensor width = 22.30 mm
Sensor height = 14.90 mm
Effective megapixels = 24.20
Resolution horizontal: X × r = 4017 × 1.5 = 6026
Resolution vertical: X = 4017
Sensor resolution = 6026 x 4017
Sensor height = 14.90 mm
Effective megapixels = 24.20
| r = 22.30/14.90 = 1.5 |
|
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 |
X-8 Sports crop factor
Sensor diagonal in mm = 7.19 mm
| Crop factor = | 43.27 | = 6.02 |
| 7.19 |
Rebel T7i 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).
X-8 Sports equivalent aperture
Crop factor = 6.02
Aperture = f2.9 - f5.2
35-mm equivalent aperture = (f2.9 - f5.2) × 6.02 = f17.5 - f31.3
Aperture = f2.9 - f5.2
35-mm equivalent aperture = (f2.9 - f5.2) × 6.02 = f17.5 - f31.3
Rebel T7i 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 T7i, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Canon Rebel T7i is 1.61
Crop factor for Canon Rebel T7i is 1.61
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If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.