Olympus Stylus 770 SW vs. Olympus Stylus 725 SW

Comparison

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Olympus Stylus 770 SW

Olympus Stylus 725 SW

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Megapixels

7.10

Max. image resolution

3072 x 2304

Sensor

Sensor type

CCD

Sensor size

1/2.3" (~ 6.16 x 4.62 mm)

Sensor resolution

3072 x 2310

Diagonal

7.70 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
(ratio)

Olympus Stylus 770 SW		Olympus Stylus 725 SW

Surface area:

28.46 mm²

Difference: 0 mm² (0%)

770 SW and 725 SW sensors are the same size.

Pixel pitch

2.01 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 µm (0%)

770 SW and 725 SW have the same pixel pitch.

Pixel area

4.04 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: 0 µm² (0%)

Olympus 770 SW and Olympus 725 SW have the same pixel area.

Pixel density

24.87 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: 0 µm (0%)

Olympus 770 SW and Olympus 725 SW have the same pixel density.

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

Specs

Olympus 770 SW

Olympus 725 SW

Crop factor

5.62

Total megapixels

7.40

Effective megapixels

7.10

Optical zoom

Digital zoom

Yes

ISO sensitivity

Auto, 80, 100, 200, 400, 800, (1600 with limitations)

Auto, 64, 100, 200, 400, (800, 1600 with limitations)

RAW

Manual focus

Normal focus range

50 cm

60 cm

Macro focus range

7 cm

2 cm

Focal length (35mm equiv.)

38 - 114 mm

Aperture priority

Max. aperture

f3.5 - f5.0

Max. aperture (35mm equiv.)

f19.7 - f28.1

Metering

Multi, Center-weighted, Spot

Exposure compensation

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

4 sec

Max. shutter speed

1/2000 sec

1/1000 sec

Built-in flash

External flash

Viewfinder

None

White balance presets

Screen size

2.5"

Screen resolution

230,000 dots

115,000 dots

Video capture

Max. video resolution

Storage types

xD Picture Card, Internal

USB

USB 1.0

HDMI

Wireless

GPS

Battery

Lithium-Ion rechargeable

Weight

195 g

190 g

Dimensions

92 x 59 x 21 mm

91 x 58 x 20 mm

Year

2007

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

Olympus 770 SW diagonal

The diagonal of 770 SW sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm

Diagonal = √

6.16² + 4.62²

= 7.70 mm

Olympus 725 SW diagonal

The diagonal of 725 SW sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm

Diagonal = √

6.16² + 4.62²

= 7.70 mm

Surface area

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

770 SW sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

725 SW sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 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

770 SW pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 3072 pixels

Pixel pitch =	6.16	× 1000	= 2.01 µm
	3072

725 SW pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 3072 pixels

Pixel pitch =	6.16	× 1000	= 2.01 µm
	3072

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

770 SW pixel area

Pixel pitch = 2.01 µm

Pixel area = 2.01² = 4.04 µm²

725 SW pixel area

Pixel pitch = 2.01 µm

Pixel area = 2.01² = 4.04 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

770 SW pixel density

Sensor resolution width = 3072 pixels
Sensor width = 0.616 cm

Pixel density = (3072 / 0.616)² / 1000000 = 24.87 MP/cm²

725 SW pixel density

Sensor resolution width = 3072 pixels
Sensor width = 0.616 cm

Pixel density = (3072 / 0.616)² / 1000000 = 24.87 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

770 SW sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 7.10

r = 6.16/4.62 = 1.33

X = √	7.10 × 1000000	= 2310
	1.33

Resolution horizontal: X × r = 2310 × 1.33 = 3072
Resolution vertical: X = 2310

Sensor resolution = 3072 x 2310

725 SW sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 7.10

r = 6.16/4.62 = 1.33

X = √	7.10 × 1000000	= 2310
	1.33

Resolution horizontal: X × r = 2310 × 1.33 = 3072
Resolution vertical: X = 2310

Sensor resolution = 3072 x 2310

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

770 SW crop factor

Sensor diagonal in mm = 7.70 mm

Crop factor =	43.27	= 5.62
	7.70

725 SW crop factor

Sensor diagonal in mm = 7.70 mm

Crop factor =	43.27	= 5.62
	7.70

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).

770 SW equivalent aperture

Crop factor = 5.62
Aperture = f3.5 - f5.0

35-mm equivalent aperture = (f3.5 - f5.0) × 5.62 = f19.7 - f28.1

725 SW equivalent aperture

Crop factor = 5.62
Aperture = f3.5 - f5.0

35-mm equivalent aperture = (f3.5 - f5.0) × 5.62 = f19.7 - f28.1

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