HP Photosmart 935 vs. Kodak EasyShare Z1085 IS

Comparison

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HP Photosmart 935

Kodak EasyShare Z1085 IS

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Megapixels

5.24

10.00

Max. image resolution

2608 x 1952

3648 x 2736

Sensor

Sensor type

CCD

Sensor size

1/1.8" (~ 7.11 x 5.33 mm)

1/1.63" (~ 7.85 x 5.89 mm)

Sensor resolution

2640 x 1985

3647 x 2742

Diagonal

8.89 mm

9.81 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	:	1.22
(ratio)

HP Photosmart 935		Kodak EasyShare Z1085 IS

Surface area:

37.90 mm²

46.24 mm²

Difference: 8.34 mm² (22%)

Z1085 IS sensor is approx. 1.22x bigger than 935 sensor.

Note: You are comparing cameras of different generations. There is a 5 year gap between HP 935 (2003) and Kodak Z1085 IS (2008). All things being equal, newer sensor generations generally outperform the older.

Pixel pitch

2.69 µm

2.15 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: 0.54 µm (25%)

Pixel pitch of 935 is approx. 25% higher than pixel pitch of Z1085 IS.

Pixel area

7.24 µm²

4.62 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: 2.62 µm² (57%)

A pixel on HP 935 sensor is approx. 57% bigger than a pixel on Kodak Z1085 IS.

Pixel density

13.79 MP/cm²

21.58 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: 7.79 µm (56%)

Kodak Z1085 IS has approx. 56% higher pixel density than HP 935.

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

Specs

HP 935

Kodak Z1085 IS

Crop factor

4.87

4.41

Total megapixels

Effective megapixels

10.00

Optical zoom

Digital zoom

Yes

ISO sensitivity

Auto, 50, 100, 200, 400

Auto

RAW

Manual focus

Normal focus range

50 cm

20 cm

Macro focus range

14 cm

20 cm

Focal length (35mm equiv.)

37 - 111 mm

35 - 175 mm

Aperture priority

Yes

Max. aperture

f2.6 - f4.8

f2.8 - f5.1

Max. aperture (35mm equiv.)

f12.7 - f23.4

f12.3 - f22.5

Metering

Centre weighted, Matrix, Spot

Multi, Center-weighted, Spot

Exposure compensation

±2 EV (in 1/2 EV steps)

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

15 sec

16 sec

Max. shutter speed

1/2000 sec

Built-in flash

External flash

Viewfinder

Optical (tunnel)

None

White balance presets

Screen size

1.5"

2.5"

Screen resolution

113,578 dots

230,000 dots

Video capture

Max. video resolution

Storage types

MultiMedia, Secure Digital

CompactFlash type I, SDHC, Secure Digital

USB

USB 1.0

USB 2.0 (480 Mbit/sec)

HDMI

Wireless

GPS

Battery

AA (2) batteries (NiMH recommended)

Kodak KLIC-7004 Lithium-Ion,

Weight

260 g

214 g

Dimensions

97 x 45 x 67 mm

90 x 65 x 39 mm

Year

2003

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

HP 935 diagonal

The diagonal of 935 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

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

Surface area

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

935 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

Z1085 IS sensor area

Width = 7.85 mm
Height = 5.89 mm

Surface area = 7.85 × 5.89 = 46.24 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

935 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2640 pixels

Pixel pitch =	7.11	× 1000	= 2.69 µm
	2640

Z1085 IS pixel pitch

Sensor width = 7.85 mm
Sensor resolution width = 3647 pixels

Pixel pitch =	7.85	× 1000	= 2.15 µm
	3647

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

935 pixel area

Pixel pitch = 2.69 µm

Pixel area = 2.69² = 7.24 µm²

Z1085 IS pixel area

Pixel pitch = 2.15 µm

Pixel area = 2.15² = 4.62 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

935 pixel density

Sensor resolution width = 2640 pixels
Sensor width = 0.711 cm

Pixel density = (2640 / 0.711)² / 1000000 = 13.79 MP/cm²

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

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

935 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 5.24

r = 7.11/5.33 = 1.33

X = √	5.24 × 1000000	= 1985
	1.33

Resolution horizontal: X × r = 1985 × 1.33 = 2640
Resolution vertical: X = 1985

Sensor resolution = 2640 x 1985

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

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

935 crop factor

Sensor diagonal in mm = 8.89 mm

Crop factor =	43.27	= 4.87
	8.89

Z1085 IS crop factor

Sensor diagonal in mm = 9.81 mm

Crop factor =	43.27	= 4.41
	9.81

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).

935 equivalent aperture

Crop factor = 4.87
Aperture = f2.6 - f4.8

35-mm equivalent aperture = (f2.6 - f4.8) × 4.87 = f12.7 - f23.4

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

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