Contax TVS Digital vs. Canon Digital IXUS 800 IS

Comparison

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Contax TVS Digital

Canon Digital IXUS 800 IS

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Megapixels

5.20

6.00

Max. image resolution

2560 x 1920

2816 x 2112

Sensor

Sensor type

CCD

Sensor size

1/1.8" (~ 7.11 x 5.33 mm)

1/2.5" (~ 5.75 x 4.32 mm)

Sensor resolution

2629 x 1977

2825 x 2124

Diagonal

8.89 mm

7.19 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
1.53	:	1
(ratio)

Contax TVS Digital		Canon Digital IXUS 800 IS

Surface area:

37.90 mm²

24.84 mm²

Difference: 13.06 mm² (53%)

TVS sensor is approx. 1.53x bigger than IXUS 800 IS sensor.

Note: You are comparing cameras of different generations. There is a 4 year gap between Contax TVS (2002) and Canon IXUS 800 IS (2006). All things being equal, newer sensor generations generally outperform the older.

Pixel pitch

2.7 µm

2.04 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: 0.66 µm (32%)

Pixel pitch of TVS is approx. 32% higher than pixel pitch of IXUS 800 IS.

Pixel area

7.29 µm²

4.16 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: 3.13 µm² (75%)

A pixel on Contax TVS sensor is approx. 75% bigger than a pixel on Canon IXUS 800 IS.

Pixel density

13.67 MP/cm²

24.14 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: 10.47 µm (77%)

Canon IXUS 800 IS has approx. 77% higher pixel density than Contax TVS .

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

Specs

Contax TVS

Canon IXUS 800 IS

Crop factor

4.87

6.02

Total megapixels

6.20

Effective megapixels

6.00

Optical zoom

Digital zoom

Yes

ISO sensitivity

Auto, 80 ,100, 200, 400, 800

RAW

Manual focus

Normal focus range

60 cm

45 cm

Macro focus range

15 cm

2 cm

Focal length (35mm equiv.)

35 - 105 mm

35 - 140 mm

Aperture priority

Yes

Max. aperture

f2.8 - f4.8

f2.8 - f5.5

Max. aperture (35mm equiv.)

f13.6 - f23.4

f16.9 - f33.1

Metering

Centre weighted

Multi, Center-weighted, Spot

Exposure compensation

±2 EV (in 1/3 EV, 1/2 EV steps)

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

1 sec

15 sec

Max. shutter speed

1/2000 sec

1/1600 sec

Built-in flash

External flash

Viewfinder

Optical (tunnel)

White balance presets

Screen size

1.6"

2.5"

Screen resolution

84,960 dots

173,000 dots

Video capture

Max. video resolution

Storage types

MultiMedia, Secure Digital

SD/MMC card

USB

USB 1.0

USB 2.0 (480 Mbit/sec)

HDMI

Wireless

GPS

Battery

Lithium-Ion rechargeable

Lithium-Ion NB-5L battery

Weight

210 g

195 g

Dimensions

112 x 60 x 33 mm

90 x 57 x 26 mm

Year

2002

2006

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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

Contax TVS diagonal

The diagonal of TVS 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

Canon IXUS 800 IS diagonal

The diagonal of IXUS 800 IS sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of that value - 7.19 mm. If you want to know why, see sensor sizes.

w = 5.75 mm
h = 4.32 mm

Diagonal = √

5.75² + 4.32²

= 7.19 mm

Surface area

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

TVS sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

IXUS 800 IS sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 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

TVS pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2629 pixels

Pixel pitch =	7.11	× 1000	= 2.7 µm
	2629

IXUS 800 IS pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2825 pixels

Pixel pitch =	5.75	× 1000	= 2.04 µm
	2825

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

TVS pixel area

Pixel pitch = 2.7 µm

Pixel area = 2.7² = 7.29 µm²

IXUS 800 IS pixel area

Pixel pitch = 2.04 µm

Pixel area = 2.04² = 4.16 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

TVS pixel density

Sensor resolution width = 2629 pixels
Sensor width = 0.711 cm

Pixel density = (2629 / 0.711)² / 1000000 = 13.67 MP/cm²

IXUS 800 IS pixel density

Sensor resolution width = 2825 pixels
Sensor width = 0.575 cm

Pixel density = (2825 / 0.575)² / 1000000 = 24.14 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

TVS sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 5.20

r = 7.11/5.33 = 1.33

X = √	5.20 × 1000000	= 1977
	1.33

Resolution horizontal: X × r = 1977 × 1.33 = 2629
Resolution vertical: X = 1977

Sensor resolution = 2629 x 1977

IXUS 800 IS sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 6.00

r = 5.75/4.32 = 1.33

X = √	6.00 × 1000000	= 2124
	1.33

Resolution horizontal: X × r = 2124 × 1.33 = 2825
Resolution vertical: X = 2124

Sensor resolution = 2825 x 2124

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

TVS crop factor

Sensor diagonal in mm = 8.89 mm

Crop factor =	43.27	= 4.87
	8.89

IXUS 800 IS crop factor

Sensor diagonal in mm = 7.19 mm

Crop factor =	43.27	= 6.02
	7.19

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).

TVS equivalent aperture

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

35-mm equivalent aperture = (f2.8 - f4.8) × 4.87 = f13.6 - f23.4

IXUS 800 IS equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5.5

35-mm equivalent aperture = (f2.8 - f5.5) × 6.02 = f16.9 - f33.1

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