Kodak EasyShare Z1085 IS vs. Kodak EasyShare C813

Comparison

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Kodak EasyShare Z1085 IS

Kodak EasyShare C813

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Megapixels

10.00

8.20

Max. image resolution

3648 x 2736

3296 x 2472

Sensor

Sensor type

CCD

Sensor size

1/1.63" (~ 7.85 x 5.89 mm)

1/2.5" (~ 5.75 x 4.32 mm)

Sensor resolution

3647 x 2742

3302 x 2483

Diagonal

9.81 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
1.86	:	1
(ratio)

Kodak EasyShare Z1085 IS		Kodak EasyShare C813

Surface area:

46.24 mm²

24.84 mm²

Difference: 21.4 mm² (86%)

Z1085 IS sensor is approx. 1.86x bigger than C813 sensor.

Pixel pitch

2.15 µm

1.74 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: 0.41 µm (24%)

Pixel pitch of Z1085 IS is approx. 24% higher than pixel pitch of C813.

Pixel area

4.62 µm²

3.03 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: 1.59 µm² (52%)

A pixel on Kodak Z1085 IS sensor is approx. 52% bigger than a pixel on Kodak C813.

Pixel density

21.58 MP/cm²

32.98 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: 11.4 µm (53%)

Kodak C813 has approx. 53% higher pixel density than Kodak Z1085 IS.

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

Specs

Kodak Z1085 IS

Kodak C813

Crop factor

4.41

6.02

Total megapixels

8.30

Effective megapixels

10.00

8.20

Optical zoom

Digital zoom

Yes

ISO sensitivity

Auto

Auto, 100, 200, 400, 800, 1250

RAW

Manual focus

Normal focus range

20 cm

60 cm

Macro focus range

20 cm

13 cm

Focal length (35mm equiv.)

35 - 175 mm

36 - 108 mm

Aperture priority

Max. aperture

f2.8 - f5.1

f2.7 - f4.8

Max. aperture (35mm equiv.)

f12.3 - f22.5

f16.3 - f28.9

Metering

Multi, Center-weighted, Spot

Multi-pattern

Exposure compensation

±2 EV (in 1/3 EV steps)

±2 EV (in 1/2 EV steps)

Shutter priority

Min. shutter speed

16 sec

1/2 sec

Max. shutter speed

1/2000 sec

1/1400 sec

Built-in flash

External flash

Viewfinder

None

White balance presets

Screen size

2.5"

2.4"

Screen resolution

230,000 dots

115,000 dots

Video capture

Max. video resolution

Storage types

CompactFlash type I, SDHC, Secure Digital

MultiMedia, Secure Digital

USB

USB 2.0 (480 Mbit/sec)

HDMI

Wireless

GPS

Battery

Kodak KLIC-7004 Lithium-Ion,

AA (2) batteries (NiMH recommended)

Weight

214 g

137 g

Dimensions

90 x 65 x 39 mm

91.0 x 65.7 x 37.3 mm

Year

2008

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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

Kodak Z1085 IS diagonal

The diagonal of Z1085 IS sensor is not 1/1.63 or 0.61" (15.6 mm) as you might expect, but approximately two thirds of that value - 9.81 mm. If you want to know why, see sensor sizes.

w = 7.85 mm
h = 5.89 mm

Diagonal = √

7.85² + 5.89²

= 9.81 mm

Kodak C813 diagonal

The diagonal of C813 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.

Z1085 IS sensor area

Width = 7.85 mm
Height = 5.89 mm

Surface area = 7.85 × 5.89 = 46.24 mm²

C813 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

Z1085 IS pixel pitch

Sensor width = 7.85 mm
Sensor resolution width = 3647 pixels

Pixel pitch =	7.85	× 1000	= 2.15 µm
	3647

C813 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 3302 pixels

Pixel pitch =	5.75	× 1000	= 1.74 µm
	3302

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

Z1085 IS pixel area

Pixel pitch = 2.15 µm

Pixel area = 2.15² = 4.62 µm²

C813 pixel area

Pixel pitch = 1.74 µm

Pixel area = 1.74² = 3.03 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

Z1085 IS pixel density

Sensor resolution width = 3647 pixels
Sensor width = 0.785 cm

Pixel density = (3647 / 0.785)² / 1000000 = 21.58 MP/cm²

C813 pixel density

Sensor resolution width = 3302 pixels
Sensor width = 0.575 cm

Pixel density = (3302 / 0.575)² / 1000000 = 32.98 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

Z1085 IS sensor resolution

Sensor width = 7.85 mm
Sensor height = 5.89 mm
Effective megapixels = 10.00

r = 7.85/5.89 = 1.33

X = √	10.00 × 1000000	= 2742
	1.33

Resolution horizontal: X × r = 2742 × 1.33 = 3647
Resolution vertical: X = 2742

Sensor resolution = 3647 x 2742

C813 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 8.20

r = 5.75/4.32 = 1.33

X = √	8.20 × 1000000	= 2483
	1.33

Resolution horizontal: X × r = 2483 × 1.33 = 3302
Resolution vertical: X = 2483

Sensor resolution = 3302 x 2483

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

Z1085 IS crop factor

Sensor diagonal in mm = 9.81 mm

Crop factor =	43.27	= 4.41
	9.81

C813 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).

Z1085 IS equivalent aperture

Crop factor = 4.41
Aperture = f2.8 - f5.1

35-mm equivalent aperture = (f2.8 - f5.1) × 4.41 = f12.3 - f22.5

C813 equivalent aperture

Crop factor = 6.02
Aperture = f2.7 - f4.8

35-mm equivalent aperture = (f2.7 - f4.8) × 6.02 = f16.3 - f28.9

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