Sony Cyber-shot DSC-U20 vs. Fujifilm FinePix A330

Comparison

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Sony Cyber-shot DSC-U20

Fujifilm FinePix A330

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Megapixels

2.00

3.30

Max. image resolution

1632 x 1224

2016 x 1512

Sensor

Sensor type

CCD

Sensor size

1/2.7" (~ 5.33 x 4 mm)

Sensor resolution

1631 x 1226

2095 x 1575

Diagonal

6.66 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	:	1
(ratio)

Sony Cyber-shot DSC-U20		Fujifilm FinePix A330

Surface area:

21.32 mm²

Difference: 0 mm² (0%)

U20 and A330 sensors are the same size.

Note: You are comparing cameras of different generations. There is a 2 year gap between Sony U20 (2002) and Fujifilm A330 (2004). All things being equal, newer sensor generations generally outperform the older.

Pixel pitch

3.27 µm

2.54 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: 0.73 µm (29%)

Pixel pitch of U20 is approx. 29% higher than pixel pitch of A330.

Pixel area

10.69 µm²

6.45 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:

Pixel area difference: 4.24 µm² (66%)

A pixel on Sony U20 sensor is approx. 66% bigger than a pixel on Fujifilm A330.

Pixel density

9.36 MP/cm²

15.45 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: 6.09 µm (65%)

Fujifilm A330 has approx. 65% higher pixel density than Sony U20.

To learn about the accuracy of these numbers, click here.

Specs

Sony U20

Fujifilm A330

Crop factor

6.5

Total megapixels

3.20

Effective megapixels

3.30

Optical zoom

Digital zoom

Yes

ISO sensitivity

Auto

100

RAW

Manual focus

Normal focus range

10 cm

60 cm

Macro focus range

10 cm

Focal length (35mm equiv.)

33 mm

38 - 114 mm

Aperture priority

Max. aperture

f2.8

f2.8 - f4.8

Max. aperture (35mm equiv.)

f18.2

f18.2 - f31.2

Metering

Centre weighted

Multi, Average, Spot

Exposure compensation

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

1/30 sec

2 sec

Max. shutter speed

1/2000 sec

Built-in flash

External flash

Viewfinder

None

Optical (tunnel)

White balance presets

Screen size

1.5"

Screen resolution

64,460 dots

60,000 dots

Video capture

Max. video resolution

Storage types

Memory Stick

xD Picture Card

USB

USB 1.0

HDMI

Wireless

GPS

Battery

AAA (2) batteries NiMH supplied

AA NiMH (2) batteries

Weight

118 g

160 g

Dimensions

85 x 40 x 29 mm

104 x 62 x 31 mm

Year

2002

2004

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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

Sony U20 diagonal

The diagonal of U20 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

Fujifilm A330 diagonal

The diagonal of A330 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

Surface area

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

U20 sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 mm²

A330 sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 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

U20 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 1631 pixels

Pixel pitch =	5.33	× 1000	= 3.27 µm
	1631

A330 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 2095 pixels

Pixel pitch =	5.33	× 1000	= 2.54 µm
	2095

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

U20 pixel area

Pixel pitch = 3.27 µm

Pixel area = 3.27² = 10.69 µm²

A330 pixel area

Pixel pitch = 2.54 µm

Pixel area = 2.54² = 6.45 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

U20 pixel density

Sensor resolution width = 1631 pixels
Sensor width = 0.533 cm

Pixel density = (1631 / 0.533)² / 1000000 = 9.36 MP/cm²

A330 pixel density

Sensor resolution width = 2095 pixels
Sensor width = 0.533 cm

Pixel density = (2095 / 0.533)² / 1000000 = 15.45 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

U20 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 2.00

r = 5.33/4.00 = 1.33

X = √	2.00 × 1000000	= 1226
	1.33

Resolution horizontal: X × r = 1226 × 1.33 = 1631
Resolution vertical: X = 1226

Sensor resolution = 1631 x 1226

A330 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 3.30

r = 5.33/4.00 = 1.33

X = √	3.30 × 1000000	= 1575
	1.33

Resolution horizontal: X × r = 1575 × 1.33 = 2095
Resolution vertical: X = 1575

Sensor resolution = 2095 x 1575

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

U20 crop factor

Sensor diagonal in mm = 6.66 mm

Crop factor =	43.27	= 6.5
	6.66

A330 crop factor

Sensor diagonal in mm = 6.66 mm

Crop factor =	43.27	= 6.5
	6.66

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).

U20 equivalent aperture

Crop factor = 6.5
Aperture = f2.8

35-mm equivalent aperture = (f2.8) × 6.5 = f18.2

A330 equivalent aperture

Crop factor = 6.5
Aperture = f2.8 - f4.8

35-mm equivalent aperture = (f2.8 - f4.8) × 6.5 = f18.2 - f31.2

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