Sony Cyber-shot DSC-W50 vs. Panasonic Lumix DMC-LX3

Comparison

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Cyber-shot DSC-W50 image
vs
Lumix DMC-LX3 image
Sony Cyber-shot DSC-W50 Panasonic Lumix DMC-LX3
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Megapixels
6.00
10.10
Max. image resolution
2816 x 2112
3648 x 2736

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/1.63" (~ 7.85 x 5.89 mm)
Sensor resolution
2825 x 2124
3665 x 2756
Diagonal
7.19 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 : 1.86
(ratio)
Sony Cyber-shot DSC-W50 Panasonic Lumix DMC-LX3
Surface area:
24.84 mm² vs 46.24 mm²
Difference: 21.4 mm² (86%)
LX3 sensor is approx. 1.86x bigger than W50 sensor.
Note: You are comparing cameras of different generations. There is a 2 year gap between Sony W50 (2006) and Panasonic LX3 (2008). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
2.04 µm
2.14 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: 0.1 µm (5%)
Pixel pitch of LX3 is approx. 5% higher than pixel pitch of W50.
Pixel area
4.16 µm²
4.58 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:
vs
Pixel area difference: 0.42 µm² (10%)
A pixel on Panasonic LX3 sensor is approx. 10% bigger than a pixel on Sony W50.
Pixel density
24.14 MP/cm²
21.8 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: 2.34 µm (11%)
Sony W50 has approx. 11% higher pixel density than Panasonic LX3.
To learn about the accuracy of these numbers, click here.



Specs

Sony W50
Panasonic LX3
Crop factor
6.02
4.41
Total megapixels
11.30
Effective megapixels
10.10
Optical zoom
3x
2.5x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400, 800, 1000
Auto, 80, 100, 200, 400, 800, 1600, 3200
RAW
Manual focus
Normal focus range
50 cm
50 cm
Macro focus range
2 cm
1 cm
Focal length (35mm equiv.)
38 - 114 mm
24 - 60 mm
Aperture priority
Yes
Yes
Max. aperture
f2.8 - f5.2
f2.0 - f2.8
Max. aperture (35mm equiv.)
f16.9 - f31.3
f8.8 - f12.3
Metering
Multi-pattern, Spot
Centre weighted, Intelligent Multiple, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
1 sec
60 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
None
White balance presets
6
7
Screen size
2.5"
3"
Screen resolution
115,000 dots
460,000 dots
Video capture
Max. video resolution
Storage types
Memory Stick Duo, Memory Stick Pro Duo
MultiMedia, SDHC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion NP-BG1 rechargeable
Lithium-Ion rechargeable battery
Weight
127 g
229 g
Dimensions
89 x 57 x 23 mm
108.7 x 59.5 x 27.1 mm
Year
2006
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

Sony W50 diagonal

The diagonal of W50 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

Panasonic LX3 diagonal

The diagonal of LX3 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.

W50 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

LX3 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

W50 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2825 pixels
Pixel pitch =   5.75  × 1000  = 2.04 µm
2825

LX3 pixel pitch

Sensor width = 7.85 mm
Sensor resolution width = 3665 pixels
Pixel pitch =   7.85  × 1000  = 2.14 µm
3665


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

W50 pixel area

Pixel pitch = 2.04 µm

Pixel area = 2.04² = 4.16 µm²

LX3 pixel area

Pixel pitch = 2.14 µm

Pixel area = 2.14² = 4.58 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

W50 pixel density

Sensor resolution width = 2825 pixels
Sensor width = 0.575 cm

Pixel density = (2825 / 0.575)² / 1000000 = 24.14 MP/cm²

LX3 pixel density

Sensor resolution width = 3665 pixels
Sensor width = 0.785 cm

Pixel density = (3665 / 0.785)² / 1000000 = 21.8 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

W50 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

LX3 sensor resolution

Sensor width = 7.85 mm
Sensor height = 5.89 mm
Effective megapixels = 10.10
r = 7.85/5.89 = 1.33
X =  10.10 × 1000000  = 2756
1.33
Resolution horizontal: X × r = 2756 × 1.33 = 3665
Resolution vertical: X = 2756

Sensor resolution = 3665 x 2756


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


W50 crop factor

Sensor diagonal in mm = 7.19 mm
Crop factor =   43.27  = 6.02
7.19

LX3 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).

W50 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5.2

35-mm equivalent aperture = (f2.8 - f5.2) × 6.02 = f16.9 - f31.3

LX3 equivalent aperture

Crop factor = 4.41
Aperture = f2.0 - f2.8

35-mm equivalent aperture = (f2.0 - f2.8) × 4.41 = f8.8 - f12.3

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