Canon PowerShot A80 vs. Sony Cyber-shot DSC-T7

Comparison

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Canon PowerShot A80

Sony Cyber-shot DSC-T7

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Megapixels

3.90

5.10

Max. image resolution

2272 x 1704

2592 x 1944

Sensor

Sensor type

CCD

Sensor size

1/1.8" (~ 7.11 x 5.33 mm)

1/2.4" (~ 5.90 x 4.43 mm)

Sensor resolution

2277 x 1712

2604 x 1958

Diagonal

8.89 mm

7.38 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
1.45	:	1
(ratio)

Canon PowerShot A80		Sony Cyber-shot DSC-T7

Surface area:

37.90 mm²

26.14 mm²

Difference: 11.76 mm² (45%)

A80 sensor is approx. 1.45x bigger than T7 sensor.

Note: You are comparing cameras of different generations. There is a 2 year gap between Canon A80 (2003) and Sony T7 (2005). All things being equal, newer sensor generations generally outperform the older.

Pixel pitch

3.12 µm

2.27 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: 0.85 µm (37%)

Pixel pitch of A80 is approx. 37% higher than pixel pitch of T7.

Pixel area

9.73 µm²

5.15 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: 4.58 µm² (89%)

A pixel on Canon A80 sensor is approx. 89% bigger than a pixel on Sony T7.

Pixel density

10.26 MP/cm²

19.48 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: 9.22 µm (90%)

Sony T7 has approx. 90% higher pixel density than Canon A80.

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

Specs

Canon A80

Sony T7

Crop factor

4.87

5.86

Total megapixels

4.10

Effective megapixels

3.90

Optical zoom

Digital zoom

Yes

ISO sensitivity

Auto, 50, 100, 200, 400

Auto, 100, 200, 400

RAW

Manual focus

Normal focus range

45 cm

50 cm

Macro focus range

5 cm

1 cm

Focal length (35mm equiv.)

38 - 114 mm

Aperture priority

Yes

Max. aperture

f2.8 - f4.9

f3.5 - f4.4

Max. aperture (35mm equiv.)

f13.6 - f23.9

f20.5 - f25.8

Metering

Centre weighted, Matrix, Spot

Centre weighted

Exposure compensation

±2 EV (in 1/3 EV steps)

Shutter priority

Yes

Min. shutter speed

15 sec

1 sec

Max. shutter speed

1/2000 sec

1/1000 sec

Built-in flash

External flash

Viewfinder

Optical (tunnel)

None

White balance presets

Screen size

1.5"

2.5"

Screen resolution

67,000 dots

230,000 dots

Video capture

Max. video resolution

Storage types

CompactFlash type I

Memory Stick Duo, Memory Stick Pro Duo

USB

USB 1.0

USB 2.0 (480 Mbit/sec)

HDMI

Wireless

GPS

Battery

AA (4) batteries (NiMH recommended)

InfoLithium (NP-FE1)

Weight

250 g

115 g

Dimensions

103 x 65 x 35 mm

92 x 60 x 15 mm

Year

2003

2005

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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 A80 diagonal

The diagonal of A80 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

Sony T7 diagonal

The diagonal of T7 sensor is not 1/2.4 or 0.42" (10.6 mm) as you might expect, but approximately two thirds of that value - 7.38 mm. If you want to know why, see sensor sizes.

w = 5.90 mm
h = 4.43 mm

Diagonal = √

5.90² + 4.43²

= 7.38 mm

Surface area

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

A80 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

T7 sensor area

Width = 5.90 mm
Height = 4.43 mm

Surface area = 5.90 × 4.43 = 26.14 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

A80 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2277 pixels

Pixel pitch =	7.11	× 1000	= 3.12 µm
	2277

T7 pixel pitch

Sensor width = 5.90 mm
Sensor resolution width = 2604 pixels

Pixel pitch =	5.90	× 1000	= 2.27 µm
	2604

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

A80 pixel area

Pixel pitch = 3.12 µm

Pixel area = 3.12² = 9.73 µm²

T7 pixel area

Pixel pitch = 2.27 µm

Pixel area = 2.27² = 5.15 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

A80 pixel density

Sensor resolution width = 2277 pixels
Sensor width = 0.711 cm

Pixel density = (2277 / 0.711)² / 1000000 = 10.26 MP/cm²

T7 pixel density

Sensor resolution width = 2604 pixels
Sensor width = 0.59 cm

Pixel density = (2604 / 0.59)² / 1000000 = 19.48 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

A80 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.90

r = 7.11/5.33 = 1.33

X = √	3.90 × 1000000	= 1712
	1.33

Resolution horizontal: X × r = 1712 × 1.33 = 2277
Resolution vertical: X = 1712

Sensor resolution = 2277 x 1712

T7 sensor resolution

Sensor width = 5.90 mm
Sensor height = 4.43 mm
Effective megapixels = 5.10

r = 5.90/4.43 = 1.33

X = √	5.10 × 1000000	= 1958
	1.33

Resolution horizontal: X × r = 1958 × 1.33 = 2604
Resolution vertical: X = 1958

Sensor resolution = 2604 x 1958

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

A80 crop factor

Sensor diagonal in mm = 8.89 mm

Crop factor =	43.27	= 4.87
	8.89

T7 crop factor

Sensor diagonal in mm = 7.38 mm

Crop factor =	43.27	= 5.86
	7.38

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).

A80 equivalent aperture

Crop factor = 4.87
Aperture = f2.8 - f4.9

35-mm equivalent aperture = (f2.8 - f4.9) × 4.87 = f13.6 - f23.9

T7 equivalent aperture

Crop factor = 5.86
Aperture = f3.5 - f4.4

35-mm equivalent aperture = (f3.5 - f4.4) × 5.86 = f20.5 - f25.8

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