Canon EOS 450D vs. Canon EOS Rebel T3i / 600D

Comparison

EOS 450D image
vs.
EOS Rebel T3i / 600D image

Comparison

Canon EOS 450D Canon EOS Rebel T3i / 600D
Megapixels
12.20 18.00
Max. resolution
4272 x 2848 5184 x 3456
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
CMOS CMOS
Sensor size
22.2 x 14.8 mm 22.3 x 14.9 mm
Sensor resolution
4278 x 2852  5196 x 3464 
Diagonal
26.68 mm  26.82 mm 
Surface area
328.56 mm²  332.27 mm² 
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 sizes:
Canon EOS 450D
vs.
Canon EOS Rebel T3i / 600D
 
Surface area:
Canon EOS 450D
Canon EOS Rebel T3i / 600D
Difference: 3.71 mm² (1%)
Canon EOS Rebel T3i / 600D has approx. 1% more surface area than Canon EOS 450D.
Note: You are comparing cameras of different generations. There is a 3 year gap between Canon EOS 450D (2008) and Canon EOS Rebel T3i / 600D (2011). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
5.19 µm  4.29 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.
Pixel pitch
Canon EOS 450D
Canon EOS Rebel T3i / 600D
Difference: 0.9 µm (21%)
Pixel pitch of Canon EOS 450D is approx. 21% higher than pixel pitch of Canon EOS Rebel T3i / 600D.
Pixel area
26.94 µm²  18.4 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:
Canon EOS 450D
vs.
Canon EOS Rebel T3i / 600D
Pixel area difference: 8.54 µm² (46%)
A pixel on Canon EOS 450D sensor is approx. 46% bigger than a pixel on Canon EOS Rebel T3i / 600D.
Pixel density
3.71 MP/cm²  5.43 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.
Pixel density
Canon EOS 450D
Canon EOS Rebel T3i / 600D
Difference: 1.72 MP/cm² (46%)
Canon EOS Rebel T3i / 600D has approx. 46% higher pixel density than Canon EOS 450D.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
1.62  1.61 
Total megapixels
12.40 18.70
Effective megapixels
12.20 18.00
Optical zoom
n/a n/a
Digital zoom
No Yes
Iso
Auto, 100, 200, 400, 800, 1600 Auto, 100, 200, 400, 800, 1600, 3200, 6400, (12800 with boost)
Auto focus
Yes Yes
Manual focus
Yes Yes
Normal focus range
n/a n/a
Macro focus range
n/a n/a
Focal length (35mm equiv.)
n/a n/a
Aperture priority
Yes Yes
Aperture
n/a n/a
Aperture (35mm equiv.)
n/a  n/a 
Metering
Centre weighted, Evaluative, Spot Multi, Center-weighted, Spot, Partial
Exposure compensation
±2 EV (at 1/3 EV, 1/2 EV steps) -5EV - +5EV with 1/3 or 1/2 step
Shutter priority
Yes Yes
Min. shutter speed
Bulb+30 sec 30 sec
Max. shutter speed
1/4000 sec 1/4000 sec
Flash modes
Auto, On, Off, Red-eye Anti red-eye, Auto, Fill in, Off, Slow flash
Built-in flash
Yes Yes
External flash
Yes Yes
Viewfinder
Optical (pentamirror) Optical
White balance presets
6 6
LCD display
Yes Yes
LCD size
3" 3"
LCD resolution
230,000 1,040,000
Min. image resolution
2256 x 1504 480 x 480
Selftimer
Yes Yes
Storage types
SDHC, Secure Digital SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec) USB 2.0 Hi-Speed
Batteries
NB-4L Li-ion battery Li-Ion
Weight
524 g 570 g
Dimensions
129x98x62 mm 133.1 x 99.5 x 79.7 mm
Year
2008 2011



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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 EOS 450D diagonal

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

Canon EOS Rebel T3i / 600D 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.

Canon EOS 450D surface area

Width = 22.20 mm
Height = 14.80 mm

Surface area = 22.20 × 14.80 = 328.56 mm²

Canon EOS Rebel T3i / 600D surface 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

Canon EOS 450D pixel pitch

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

Canon EOS Rebel T3i / 600D pixel pitch

Sensor width = 22.30 mm
Sensor resolution width = 5196 pixels
Pixel pitch =   22.30  × 1000  = 4.29 µm
5196


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

Canon EOS 450D pixel area

Pixel pitch = 5.19 µm

Pixel area = 5.19² = 26.94 µm²

Canon EOS Rebel T3i / 600D pixel area

Pixel pitch = 4.29 µm

Pixel area = 4.29² = 18.4 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

You could also use this formula:
Pixel density =   effective megapixels × 1000000  / 10000
sensor surface area in mm²

Canon EOS 450D pixel density

Sensor resolution width = 4278 pixels
Sensor width = 2.22 cm

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

Canon EOS Rebel T3i / 600D pixel density

Sensor resolution width = 5196 pixels
Sensor width = 2.23 cm

Pixel density = (5196 / 2.23)² / 1000000 = 5.43 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. 22.8 × 15.5 sensor for example has a ratio of 1.47.

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

Canon EOS 450D 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

Canon EOS Rebel T3i / 600D sensor resolution

Sensor width = 22.30 mm
Sensor height = 14.90 mm
Effective megapixels = 18.00
r = 22.30/14.90 = 1.5
X =  18.00 × 1000000  = 3464
1.5
Resolution horizontal: X × r = 3464 × 1.5 = 5196
Resolution vertical: X = 3464

Sensor resolution = 5196 x 3464


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


Canon EOS 450D crop factor

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

Canon EOS Rebel T3i / 600D 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).

Canon EOS 450D 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 EOS 450D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon EOS 450D is 1.62

Canon EOS Rebel T3i / 600D 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 EOS Rebel T3i / 600D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon EOS Rebel T3i / 600D is 1.61


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