# Olympus Stylus 790 SW

### Specs compare »
 Brand: Olympus Model: Stylus 790 SW Megapixels: 7.10 Sensor: 1/2.3" (~ 6.16 x 4.62 mm) Price: check here »

## Sensor info

Olympus 790 SW comes with a 1/2.3" (~ 6.16 x 4.62 mm) CCD sensor, which has a diagonal of 7.70 mm (0.3") and a surface area of 28.46 mm².
Diagonal
7.70 mm
Surface area
28.5 mm²
Pixel pitch
2.01 µm
Pixel area
4.04 µm²
Pixel density
24.87 MP/cm²

## Actual sensor size

Note: Actual size is set to screen → change »
This is the actual size of the 790 SW sensor: ~6.16 x 4.62 mm
The sensor has a surface area of 28.5 mm². There are approx. 7,100,000 photosites (pixels) on this area. Pixel pitch, which is a measure of the distance between pixels, is 2.01 µm. Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next.

Pixel or photosite area is 4.04 µm². The larger the photosite, the more light it can capture and the more information can be recorded.

Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Olympus 790 SW has a pixel density of 24.87 MP/cm².

These numbers are important in terms of assessing the overall quality of a digital camera. Generally, the bigger (and newer) the sensor, pixel pitch and photosite area, and the smaller the pixel density, the better the camera. If you want to see how 790 SW compares to other cameras, click here.

## Specifications

 Brand: Olympus Model: Stylus 790 SW Effective megapixels: 7.10 Total megapixels: 7.40 Sensor size: 1/2.3" (~ 6.16 x 4.62 mm) Sensor type: CCD Sensor resolution: 3072 x 2310 Max. image resolution: 3072 x 2304 Crop factor: 5.62 Optical zoom: 3x Digital zoom: Yes ISO: Auto, (100 - 400), 80 - 1600 RAW support: Manual focus: Normal focus range: 50 cm Macro focus range: 7 cm Focal length (35mm equiv.): 38 - 114 mm Aperture priority: No Max aperture: f3.5 - f5.0 Max. aperture (35mm equiv.): f19.7 - f28.1 Depth of field: simulate → Metering: Multi, Center-weighted, Spot Exposure Compensation: ±2 EV (in 1/3 EV steps) Shutter priority: No Min. shutter speed: 4 sec Max. shutter speed: 1/2000 sec Built-in flash: External flash: Viewfinder: None White balance presets: 6 Screen size: 2.5" Screen resolution: 230,000 dots Video capture: Storage types: xD Picture Card, Internal USB: USB 2.0 (480 Mbit/sec) HDMI: Wireless: GPS: Battery: Lithium-Ion rechargeable Weight: 155 g Dimensions: 92 x 59 x 21 mm Year: 2007

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## Diagonal

The diagonal of 790 SW sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 0.3" (7.7 mm). If you want to know why, see sensor sizes.

Diagonal is calculated by the use of Pythagorean theorem:
 Diagonal = √ w² + h²
where w = sensor width and h = sensor height

### Olympus 790 SW diagonal:

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.

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

### Olympus 790 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

### Olympus 790 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

You could also use this formula:
 Pixel density = effective megapixels × 1000000 / 10000 sensor surface area in mm²

### Olympus 790 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

### Olympus Stylus 790 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

### Olympus 790 SW crop factor:

Sensor diagonal = 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).

### Olympus Stylus 790 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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