Canon Digital IXUS 300 vs. Pentax K10D

Comparison

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Digital IXUS 300 image
vs
K10D image
Canon Digital IXUS 300 Pentax K10D
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Megapixels
2.02
10.00
Max. image resolution
1600 x 1200
3872 x 2592

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.7" (~ 5.33 x 4 mm)
23.5 x 15.7 mm
Sensor resolution
1639 x 1232
3873 x 2582
Diagonal
6.66 mm
28.26 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 : 17.31
(ratio)
Canon Digital IXUS 300 Pentax K10D
Surface area:
21.32 mm² vs 368.95 mm²
Difference: 347.63 mm² (1631%)
K10D sensor is approx. 17.31x bigger than IXUS 300 sensor.
Note: You are comparing cameras of different generations. There is a 5 year gap between Canon IXUS 300 (2001) and Pentax K10D (2006). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
3.25 µm
6.07 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: 2.82 µm (87%)
Pixel pitch of K10D is approx. 87% higher than pixel pitch of IXUS 300.
Pixel area
10.56 µm²
36.84 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: 26.28 µm² (249%)
A pixel on Pentax K10D sensor is approx. 249% bigger than a pixel on Canon IXUS 300.
Pixel density
9.46 MP/cm²
2.72 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: 6.74 µm (248%)
Canon IXUS 300 has approx. 248% higher pixel density than Pentax K10D.
To learn about the accuracy of these numbers, click here.



Specs

Canon IXUS 300
Pentax K10D
Crop factor
6.5
1.53
Total megapixels
2.11
10.80
Effective megapixels
2.02
10.00
Optical zoom
3x
Digital zoom
Yes
No
ISO sensitivity
100
Auto, 100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
76 cm
Macro focus range
16 cm
Focal length (35mm equiv.)
35 - 105 mm
Aperture priority
No
Yes
Max. aperture
f2.7 - f4.7
Max. aperture (35mm equiv.)
f17.6 - f30.6
n/a
Metering
Multi, Center-weighted, Spot
Centre weighted, Multi-segment, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1 sec
Bulb+30 sec
Max. shutter speed
1/1500 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
Optical (pentaprism)
White balance presets
5
7
Screen size
1.5"
2.5"
Screen resolution
120,000 dots
210,000 dots
Video capture
Max. video resolution
Storage types
Compact Flash (Type I)
Secure Digital
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Canon NB-L1 680 mAh Lithium-Ion
Lithium-Ion rechargeable
Weight
270 g
710 g
Dimensions
95 x 63 x 30 mm
141.5 x 101 x 70 mm
Year
2001
2006




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vs

Diagonal

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

Canon IXUS 300 diagonal

The diagonal of IXUS 300 sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of that value - 6.66 mm. If you want to know why, see sensor sizes.

w = 5.33 mm
h = 4.00 mm
Diagonal =  5.33² + 4.00²   = 6.66 mm

Pentax K10D diagonal

w = 23.50 mm
h = 15.70 mm
Diagonal =  23.50² + 15.70²   = 28.26 mm


Surface area

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

IXUS 300 sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 mm²

K10D sensor area

Width = 23.50 mm
Height = 15.70 mm

Surface area = 23.50 × 15.70 = 368.95 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

IXUS 300 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 1639 pixels
Pixel pitch =   5.33  × 1000  = 3.25 µm
1639

K10D pixel pitch

Sensor width = 23.50 mm
Sensor resolution width = 3873 pixels
Pixel pitch =   23.50  × 1000  = 6.07 µm
3873


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

IXUS 300 pixel area

Pixel pitch = 3.25 µm

Pixel area = 3.25² = 10.56 µm²

K10D pixel area

Pixel pitch = 6.07 µm

Pixel area = 6.07² = 36.84 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

IXUS 300 pixel density

Sensor resolution width = 1639 pixels
Sensor width = 0.533 cm

Pixel density = (1639 / 0.533)² / 1000000 = 9.46 MP/cm²

K10D pixel density

Sensor resolution width = 3873 pixels
Sensor width = 2.35 cm

Pixel density = (3873 / 2.35)² / 1000000 = 2.72 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

IXUS 300 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 2.02
r = 5.33/4.00 = 1.33
X =  2.02 × 1000000  = 1232
1.33
Resolution horizontal: X × r = 1232 × 1.33 = 1639
Resolution vertical: X = 1232

Sensor resolution = 1639 x 1232

K10D sensor resolution

Sensor width = 23.50 mm
Sensor height = 15.70 mm
Effective megapixels = 10.00
r = 23.50/15.70 = 1.5
X =  10.00 × 1000000  = 2582
1.5
Resolution horizontal: X × r = 2582 × 1.5 = 3873
Resolution vertical: X = 2582

Sensor resolution = 3873 x 2582


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


IXUS 300 crop factor

Sensor diagonal in mm = 6.66 mm
Crop factor =   43.27  = 6.5
6.66

K10D crop factor

Sensor diagonal in mm = 28.26 mm
Crop factor =   43.27  = 1.53
28.26

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).

IXUS 300 equivalent aperture

Crop factor = 6.5
Aperture = f2.7 - f4.7

35-mm equivalent aperture = (f2.7 - f4.7) × 6.5 = f17.6 - f30.6

K10D 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 Pentax K10D, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Pentax K10D is 1.53

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