Canon EOS 300D vs. Canon EOS 40D

Comparison

change cameras »
EOS 300D image
vs
EOS 40D image
Canon EOS 300D Canon EOS 40D
check price » check price »
Megapixels
6.30
10.10
Max. image resolution
3072 x 2048
3888 x 2592

Sensor

Sensor type
CMOS
CMOS
Sensor size
22.7 x 15.1 mm
22.2 x 14.8 mm
Sensor resolution
3074 x 2049
3893 x 2595
Diagonal
27.26 mm
26.68 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
1.04 : 1
(ratio)
Canon EOS 300D Canon EOS 40D
Surface area:
342.77 mm² vs 328.56 mm²
Difference: 14.21 mm² (4%)
300D sensor is slightly bigger than 40D sensor (only 4% difference).
Note: You are comparing cameras of different generations. There is a 4 year gap between Canon 300D (2003) and Canon 40D (2007). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
7.38 µm
5.7 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: 1.68 µm (29%)
Pixel pitch of 300D is approx. 29% higher than pixel pitch of 40D.
Pixel area
54.46 µm²
32.49 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: 21.97 µm² (68%)
A pixel on Canon 300D sensor is approx. 68% bigger than a pixel on Canon 40D.
Pixel density
1.83 MP/cm²
3.08 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: 1.25 µm (68%)
Canon 40D has approx. 68% higher pixel density than Canon 300D.
To learn about the accuracy of these numbers, click here.



Specs

Canon 300D
Canon 40D
Crop factor
1.59
1.62
Total megapixels
6.34
10.50
Effective megapixels
6.30
10.10
Optical zoom
Digital zoom
No
No
ISO sensitivity
Auto, 100, 200, 400, 800, 1600
Auto, 100, 200, 400, 800, 1600, 3200 (H)
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, Matrix, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 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
1/8000 sec
Built-in flash
External flash
Viewfinder
Optical (pentamirror)
Optical (pentaprism)
White balance presets
6
6
Screen size
1.8"
3"
Screen resolution
118,000 dots
230,000 dots
Video capture
Max. video resolution
Storage types
CompactFlash type I, CompactFlash type II, Microdrive
Compact Flash (Type I or II)
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Canon 1100mAh Li-Ion
Canon Lithium-Ion
Weight
645 g
822 g
Dimensions
142 x 99 x 73 mm
146 x 108 x 74 mm
Year
2003
2007




Choose cameras to compare

vs

Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Canon 300D diagonal

w = 22.70 mm
h = 15.10 mm
Diagonal =  22.70² + 15.10²   = 27.26 mm

Canon 40D diagonal

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


Surface area

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

300D sensor area

Width = 22.70 mm
Height = 15.10 mm

Surface area = 22.70 × 15.10 = 342.77 mm²

40D sensor area

Width = 22.20 mm
Height = 14.80 mm

Surface area = 22.20 × 14.80 = 328.56 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

300D pixel pitch

Sensor width = 22.70 mm
Sensor resolution width = 3074 pixels
Pixel pitch =   22.70  × 1000  = 7.38 µm
3074

40D pixel pitch

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


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

300D pixel area

Pixel pitch = 7.38 µm

Pixel area = 7.38² = 54.46 µm²

40D pixel area

Pixel pitch = 5.7 µm

Pixel area = 5.7² = 32.49 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

300D pixel density

Sensor resolution width = 3074 pixels
Sensor width = 2.27 cm

Pixel density = (3074 / 2.27)² / 1000000 = 1.83 MP/cm²

40D pixel density

Sensor resolution width = 3893 pixels
Sensor width = 2.22 cm

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

300D sensor resolution

Sensor width = 22.70 mm
Sensor height = 15.10 mm
Effective megapixels = 6.30
r = 22.70/15.10 = 1.5
X =  6.30 × 1000000  = 2049
1.5
Resolution horizontal: X × r = 2049 × 1.5 = 3074
Resolution vertical: X = 2049

Sensor resolution = 3074 x 2049

40D 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


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


300D crop factor

Sensor diagonal in mm = 27.26 mm
Crop factor =   43.27  = 1.59
27.26

40D crop factor

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

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).

300D 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 300D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon 300D is 1.59

40D 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 40D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Canon 40D is 1.62

Enter your screen size (diagonal)

My screen size is  inches



Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.