Canon EOS Digital Rebel XTi vs. Nikon Coolpix L820

Comparison

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EOS Digital Rebel XTi image
vs
Coolpix L820 image
Canon EOS Digital Rebel XTi Nikon Coolpix L820
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Megapixels
10.10
16.00
Max. image resolution
3888 x 2592
4608 x 3456

Sensor

Sensor type
CMOS
CMOS
Sensor size
22.2 x 14.8 mm
1/2.3" (~ 6.16 x 4.62 mm)
Sensor resolution
3893 x 2595
4612 x 3468
Diagonal
26.68 mm
7.70 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
11.54 : 1
(ratio)
Canon EOS Digital Rebel XTi Nikon Coolpix L820
Surface area:
328.56 mm² vs 28.46 mm²
Difference: 300.1 mm² (1054%)
Digital Rebel XTi sensor is approx. 11.54x bigger than L820 sensor.
Note: You are comparing sensors of very different generations. There is a gap of 7 years between Canon Digital Rebel XTi (2006) and Nikon L820 (2013). Seven years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
5.7 µm
1.34 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: 4.36 µm (325%)
Pixel pitch of Digital Rebel XTi is approx. 325% higher than pixel pitch of L820.
Pixel area
32.49 µm²
1.8 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: 30.69 µm² (1705%)
A pixel on Canon Digital Rebel XTi sensor is approx. 1705% bigger than a pixel on Nikon L820.
Pixel density
3.08 MP/cm²
56.06 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: 52.98 µm (1720%)
Nikon L820 has approx. 1720% higher pixel density than Canon Digital Rebel XTi.
To learn about the accuracy of these numbers, click here.



Specs

Canon Digital Rebel XTi
Nikon L820
Crop factor
1.62
5.62
Total megapixels
10.50
16.79
Effective megapixels
10.10
16.00
Optical zoom
30x
Digital zoom
No
Yes
ISO sensitivity
Auto, 100, 200, 400, 800, 1600
Auto, 125, 200, 400, 800, 1600, 3200
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
1 cm
Focal length (35mm equiv.)
22.5 - 675 mm
Aperture priority
Yes
No
Max. aperture
f3 - f5.8
Max. aperture (35mm equiv.)
n/a
f16.9 - f32.6
Metering
Centre weighted, Matrix, Spot
Matrix, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
No
Min. shutter speed
Bulb+30 sec
4 sec
Max. shutter speed
1/4000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (pentamirror)
None
White balance presets
6
6
Screen size
2.5"
3"
Screen resolution
230,000 dots
921,000 dots
Video capture
Max. video resolution
1920x1080 (30p)
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
AA (2) batteries (NiMH recommended)
4 x AA Alkaline, NiMH, or Lithium batteries
Weight
556 g
470 g
Dimensions
126 x 94 x 65 mm
111.0 x 76.3 x 84.5 mm
Year
2006
2013




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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 XTi diagonal

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

Nikon L820 diagonal

The diagonal of L820 sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal =  6.16² + 4.62²   = 7.70 mm


Surface area

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

Digital Rebel XTi sensor area

Width = 22.20 mm
Height = 14.80 mm

Surface area = 22.20 × 14.80 = 328.56 mm²

L820 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 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 XTi pixel pitch

Sensor width = 22.20 mm
Sensor resolution width = 3893 pixels
Pixel pitch =   22.20  × 1000  = 5.7 µm
3893

L820 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4612 pixels
Pixel pitch =   6.16  × 1000  = 1.34 µm
4612


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 XTi pixel area

Pixel pitch = 5.7 µm

Pixel area = 5.7² = 32.49 µm²

L820 pixel area

Pixel pitch = 1.34 µm

Pixel area = 1.34² = 1.8 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 XTi pixel density

Sensor resolution width = 3893 pixels
Sensor width = 2.22 cm

Pixel density = (3893 / 2.22)² / 1000000 = 3.08 MP/cm²

L820 pixel density

Sensor resolution width = 4612 pixels
Sensor width = 0.616 cm

Pixel density = (4612 / 0.616)² / 1000000 = 56.06 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 XTi sensor resolution

Sensor width = 22.20 mm
Sensor height = 14.80 mm
Effective megapixels = 10.10
r = 22.20/14.80 = 1.5
X =  10.10 × 1000000  = 2595
1.5
Resolution horizontal: X × r = 2595 × 1.5 = 3893
Resolution vertical: X = 2595

Sensor resolution = 3893 x 2595

L820 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 16.00
r = 6.16/4.62 = 1.33
X =  16.00 × 1000000  = 3468
1.33
Resolution horizontal: X × r = 3468 × 1.33 = 4612
Resolution vertical: X = 3468

Sensor resolution = 4612 x 3468


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 XTi crop factor

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

L820 crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

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

Crop factor for Canon Digital Rebel XTi is 1.62

L820 equivalent aperture

Crop factor = 5.62
Aperture = f3 - f5.8

35-mm equivalent aperture = (f3 - f5.8) × 5.62 = f16.9 - f32.6

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