Leica D-LUX 3 vs. Panasonic Lumix DMC-TZ7

Comparison

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D-LUX 3 image
vs
Lumix DMC-TZ7 image
Leica D-LUX 3 Panasonic Lumix DMC-TZ7
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Megapixels
10.00
10.10
Max. image resolution
4224 x 2376
3648 x 2736

Sensor

Sensor type
CCD
CCD
Sensor size
1/1.65" (~ 7.76 x 5.81 mm)
1/2.33" (~ 6.08 x 4.56 mm)
Sensor resolution
3661 x 2732
3665 x 2756
Diagonal
9.69 mm
7.60 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
1.63 : 1
(ratio)
Leica D-LUX 3 Panasonic Lumix DMC-TZ7
Surface area:
45.09 mm² vs 27.72 mm²
Difference: 17.37 mm² (63%)
D-LUX 3 sensor is approx. 1.63x bigger than TZ7 sensor.
Note: You are comparing cameras of different generations. There is a 3 year gap between Leica D-LUX 3 (2006) and Panasonic TZ7 (2009). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
2.12 µm
1.66 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: 0.46 µm (28%)
Pixel pitch of D-LUX 3 is approx. 28% higher than pixel pitch of TZ7.
Pixel area
4.49 µm²
2.76 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: 1.73 µm² (63%)
A pixel on Leica D-LUX 3 sensor is approx. 63% bigger than a pixel on Panasonic TZ7.
Pixel density
22.26 MP/cm²
36.34 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: 14.08 µm (63%)
Panasonic TZ7 has approx. 63% higher pixel density than Leica D-LUX 3.
To learn about the accuracy of these numbers, click here.



Specs

Leica D-LUX 3
Panasonic TZ7
Crop factor
4.47
5.69
Total megapixels
10.40
12.70
Effective megapixels
10.00
10.10
Optical zoom
4x
12x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400
Auto, 80, 100, 200, 400, 800, 1600 - 6400
RAW
Manual focus
Normal focus range
50 cm
50 cm
Macro focus range
5 cm
3 cm
Focal length (35mm equiv.)
28 - 112 mm
25 - 300 mm
Aperture priority
Yes
No
Max. aperture
f2.8 - f4.9
f3.3 - f4.9
Max. aperture (35mm equiv.)
f12.5 - f21.9
f18.8 - f27.9
Metering
Centre weighted, Multi-segment, Spot
Intelligent Multiple
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
No
Min. shutter speed
60 sec
60 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
7
5
Screen size
2.8"
3"
Screen resolution
207,000 dots
460,000 dots
Video capture
Max. video resolution
Storage types
Secure Digital
MultiMedia, SDHC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable battery
Lithium-Ion rechargeable battery
Weight
185 g
229 g
Dimensions
106 x 58 x 26 mm
103.3 x 59.6 x 32.8 mm
Year
2006
2009




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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

Leica D-LUX 3 diagonal

The diagonal of D-LUX 3 sensor is not 1/1.65 or 0.61" (15.4 mm) as you might expect, but approximately two thirds of that value - 9.69 mm. If you want to know why, see sensor sizes.

w = 7.76 mm
h = 5.81 mm
Diagonal =  7.76² + 5.81²   = 9.69 mm

Panasonic TZ7 diagonal

The diagonal of TZ7 sensor is not 1/2.33 or 0.43" (10.9 mm) as you might expect, but approximately two thirds of that value - 7.6 mm. If you want to know why, see sensor sizes.

w = 6.08 mm
h = 4.56 mm
Diagonal =  6.08² + 4.56²   = 7.60 mm


Surface area

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

D-LUX 3 sensor area

Width = 7.76 mm
Height = 5.81 mm

Surface area = 7.76 × 5.81 = 45.09 mm²

TZ7 sensor area

Width = 6.08 mm
Height = 4.56 mm

Surface area = 6.08 × 4.56 = 27.72 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

D-LUX 3 pixel pitch

Sensor width = 7.76 mm
Sensor resolution width = 3661 pixels
Pixel pitch =   7.76  × 1000  = 2.12 µm
3661

TZ7 pixel pitch

Sensor width = 6.08 mm
Sensor resolution width = 3665 pixels
Pixel pitch =   6.08  × 1000  = 1.66 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

D-LUX 3 pixel area

Pixel pitch = 2.12 µm

Pixel area = 2.12² = 4.49 µm²

TZ7 pixel area

Pixel pitch = 1.66 µm

Pixel area = 1.66² = 2.76 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

D-LUX 3 pixel density

Sensor resolution width = 3661 pixels
Sensor width = 0.776 cm

Pixel density = (3661 / 0.776)² / 1000000 = 22.26 MP/cm²

TZ7 pixel density

Sensor resolution width = 3665 pixels
Sensor width = 0.608 cm

Pixel density = (3665 / 0.608)² / 1000000 = 36.34 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

D-LUX 3 sensor resolution

Sensor width = 7.76 mm
Sensor height = 5.81 mm
Effective megapixels = 10.00
r = 7.76/5.81 = 1.34
X =  10.00 × 1000000  = 2732
1.34
Resolution horizontal: X × r = 2732 × 1.34 = 3661
Resolution vertical: X = 2732

Sensor resolution = 3661 x 2732

TZ7 sensor resolution

Sensor width = 6.08 mm
Sensor height = 4.56 mm
Effective megapixels = 10.10
r = 6.08/4.56 = 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


D-LUX 3 crop factor

Sensor diagonal in mm = 9.69 mm
Crop factor =   43.27  = 4.47
9.69

TZ7 crop factor

Sensor diagonal in mm = 7.60 mm
Crop factor =   43.27  = 5.69
7.60

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).

D-LUX 3 equivalent aperture

Crop factor = 4.47
Aperture = f2.8 - f4.9

35-mm equivalent aperture = (f2.8 - f4.9) × 4.47 = f12.5 - f21.9

TZ7 equivalent aperture

Crop factor = 5.69
Aperture = f3.3 - f4.9

35-mm equivalent aperture = (f3.3 - f4.9) × 5.69 = f18.8 - f27.9

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