Canon PowerShot A50 vs. Kyocera Finecam S3

Comparison

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Canon PowerShot A50

Kyocera Finecam S3

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Megapixels

1.20

3.34

Max. image resolution

1280 x 960

2048 x 1536

Sensor

Sensor type

CCD

Sensor size

1/3" (~ 4.8 x 3.6 mm)

1/1.8" (~ 7.11 x 5.33 mm)

Sensor resolution

1264 x 950

2108 x 1585

Diagonal

6.00 mm

8.89 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	:	2.19
(ratio)

Canon PowerShot A50		Kyocera Finecam S3

Surface area:

17.28 mm²

37.90 mm²

Difference: 20.62 mm² (119%)

S3 sensor is approx. 2.19x bigger than A50 sensor.

Note: You are comparing cameras of different generations. There is a 2 year gap between Canon A50 (1999) and Kyocera S3 (2001). All things being equal, newer sensor generations generally outperform the older.

Pixel pitch

3.8 µm

3.37 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: 0.43 µm (13%)

Pixel pitch of A50 is approx. 13% higher than pixel pitch of S3.

Pixel area

14.44 µm²

11.36 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: 3.08 µm² (27%)

A pixel on Canon A50 sensor is approx. 27% bigger than a pixel on Kyocera S3.

Pixel density

6.93 MP/cm²

8.79 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: 1.86 µm (27%)

Kyocera S3 has approx. 27% higher pixel density than Canon A50.

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

Specs

Canon A50

Kyocera S3

Crop factor

7.21

4.87

Total megapixels

1.30

Effective megapixels

1.20

Optical zoom

2.5x

Digital zoom

Yes

ISO sensitivity

100, 200, 400

RAW

Manual focus

Normal focus range

50 cm

90 cm

Macro focus range

17 cm

10 cm

Focal length (35mm equiv.)

28 - 70 mm

38 - 76 mm

Aperture priority

Yes

Max. aperture

f2.6 - f4.0

f2.8 - f3.5

Max. aperture (35mm equiv.)

f18.7 - f28.8

f13.6 - f17

Metering

Multi, Center-weighted, Spot

Centre weighted, Matrix, Spot

Exposure compensation

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

2 sec

8 sec

Max. shutter speed

1/750 sec

1/2000 sec

Built-in flash

External flash

Viewfinder

Optical (tunnel)

White balance presets

Screen size

1.5"

Screen resolution

120,000 dots

110,000 dots

Video capture

Max. video resolution

Storage types

Compact Flash

MultiMedia, Secure Digital

USB

USB 1.0

HDMI

Wireless

GPS

Battery

Canon NiMH

Lithium-Ion battery (supplied)

Weight

290 g

160 g

Dimensions

103 x 68 x 37 mm

87 x 55 x 30 mm

Year

1999

2001

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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 A50 diagonal

The diagonal of A50 sensor is not 1/3 or 0.33" (8.5 mm) as you might expect, but approximately two thirds of that value - 6 mm. If you want to know why, see sensor sizes.

w = 4.80 mm
h = 3.60 mm

Diagonal = √

4.80² + 3.60²

= 6.00 mm

Kyocera S3 diagonal

The diagonal of S3 sensor is not 1/1.8 or 0.56" (14.1 mm) as you might expect, but approximately two thirds of that value - 8.89 mm. If you want to know why, see sensor sizes.

w = 7.11 mm
h = 5.33 mm

Diagonal = √

7.11² + 5.33²

= 8.89 mm

Surface area

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

A50 sensor area

Width = 4.80 mm
Height = 3.60 mm

Surface area = 4.80 × 3.60 = 17.28 mm²

S3 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 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

A50 pixel pitch

Sensor width = 4.80 mm
Sensor resolution width = 1264 pixels

Pixel pitch =	4.80	× 1000	= 3.8 µm
	1264

S3 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2108 pixels

Pixel pitch =	7.11	× 1000	= 3.37 µm
	2108

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

A50 pixel area

Pixel pitch = 3.8 µm

Pixel area = 3.8² = 14.44 µm²

S3 pixel area

Pixel pitch = 3.37 µm

Pixel area = 3.37² = 11.36 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

A50 pixel density

Sensor resolution width = 1264 pixels
Sensor width = 0.48 cm

Pixel density = (1264 / 0.48)² / 1000000 = 6.93 MP/cm²

S3 pixel density

Sensor resolution width = 2108 pixels
Sensor width = 0.711 cm

Pixel density = (2108 / 0.711)² / 1000000 = 8.79 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

A50 sensor resolution

Sensor width = 4.80 mm
Sensor height = 3.60 mm
Effective megapixels = 1.20

r = 4.80/3.60 = 1.33

X = √	1.20 × 1000000	= 950
	1.33

Resolution horizontal: X × r = 950 × 1.33 = 1264
Resolution vertical: X = 950

Sensor resolution = 1264 x 950

S3 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.34

r = 7.11/5.33 = 1.33

X = √	3.34 × 1000000	= 1585
	1.33

Resolution horizontal: X × r = 1585 × 1.33 = 2108
Resolution vertical: X = 1585

Sensor resolution = 2108 x 1585

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

A50 crop factor

Sensor diagonal in mm = 6.00 mm

Crop factor =	43.27	= 7.21
	6.00

S3 crop factor

Sensor diagonal in mm = 8.89 mm

Crop factor =	43.27	= 4.87
	8.89

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).

A50 equivalent aperture

Crop factor = 7.21
Aperture = f2.6 - f4.0

35-mm equivalent aperture = (f2.6 - f4.0) × 7.21 = f18.7 - f28.8

S3 equivalent aperture

Crop factor = 4.87
Aperture = f2.8 - f3.5

35-mm equivalent aperture = (f2.8 - f3.5) × 4.87 = f13.6 - f17

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