Praktica Luxmedia 14-Z51 vs. Panasonic Lumix DMC-TZ1

Comparison

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Luxmedia 14-Z51 image
vs
Lumix DMC-TZ1 image
Praktica Luxmedia 14-Z51 Panasonic Lumix DMC-TZ1
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Megapixels
14.00
4.90
Max. image resolution
4320 x 3240
2560 x 1920

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/2.5" (~ 5.75 x 4.32 mm)
Sensor resolution
4315 x 3244
2552 x 1919
Diagonal
7.70 mm
7.19 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
1.15 : 1
(ratio)
Praktica Luxmedia 14-Z51 Panasonic Lumix DMC-TZ1
Surface area:
28.46 mm² vs 24.84 mm²
Difference: 3.62 mm² (15%)
Luxmedia 14-Z51 sensor is approx. 1.15x bigger than TZ1 sensor.
Note: You are comparing cameras of different generations. There is a 5 year gap between Praktica Luxmedia 14-Z51 (2011) and Panasonic TZ1 (2006). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.43 µm
2.25 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: 0.82 µm (57%)
Pixel pitch of TZ1 is approx. 57% higher than pixel pitch of Luxmedia 14-Z51.
Pixel area
2.04 µm²
5.06 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: 3.02 µm² (148%)
A pixel on Panasonic TZ1 sensor is approx. 148% bigger than a pixel on Praktica Luxmedia 14-Z51.
Pixel density
49.07 MP/cm²
19.7 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: 29.37 µm (149%)
Praktica Luxmedia 14-Z51 has approx. 149% higher pixel density than Panasonic TZ1.
To learn about the accuracy of these numbers, click here.



Specs

Praktica Luxmedia 14-Z51
Panasonic TZ1
Crop factor
5.62
6.02
Total megapixels
6.30
Effective megapixels
14.00
4.90
Optical zoom
5x
10x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400, 800, 1600, 3200, 6400
Auto, 80, 100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
40 cm
Macro focus range
5 cm
Focal length (35mm equiv.)
27.6 - 138 mm
35 - 350 mm
Aperture priority
No
No
Max. aperture
f2.5 - f6.3
f2.8 - f4.2
Max. aperture (35mm equiv.)
f14.1 - f35.4
f16.9 - f25.3
Metering
Multi, center, spot
Centre weighted, Multi-segment, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
15 sec
60 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
5
5
Screen size
2.7"
2.5"
Screen resolution
230,400 dots
207,000 dots
Video capture
Max. video resolution
Storage types
SD/SDHC/SDXC
MultiMedia, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 1.0
HDMI
Wireless
GPS
Battery
Rechargeable Li-ion battery NP 45
Lithium-Ion rechargeable
Weight
234 g
Dimensions
98 x 59 x 22 mm
112 x 58.1 x 40.2 mm
Year
2011
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

Praktica Luxmedia 14-Z51 diagonal

The diagonal of Luxmedia 14-Z51 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

Panasonic TZ1 diagonal

The diagonal of TZ1 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


Surface area

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

Luxmedia 14-Z51 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

TZ1 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 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

Luxmedia 14-Z51 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4315 pixels
Pixel pitch =   6.16  × 1000  = 1.43 µm
4315

TZ1 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2552 pixels
Pixel pitch =   5.75  × 1000  = 2.25 µm
2552


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

Luxmedia 14-Z51 pixel area

Pixel pitch = 1.43 µm

Pixel area = 1.43² = 2.04 µm²

TZ1 pixel area

Pixel pitch = 2.25 µm

Pixel area = 2.25² = 5.06 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

Luxmedia 14-Z51 pixel density

Sensor resolution width = 4315 pixels
Sensor width = 0.616 cm

Pixel density = (4315 / 0.616)² / 1000000 = 49.07 MP/cm²

TZ1 pixel density

Sensor resolution width = 2552 pixels
Sensor width = 0.575 cm

Pixel density = (2552 / 0.575)² / 1000000 = 19.7 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

Luxmedia 14-Z51 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 14.00
r = 6.16/4.62 = 1.33
X = √  14.00 × 1000000  = 3244
1.33
Resolution horizontal: X × r = 3244 × 1.33 = 4315
Resolution vertical: X = 3244

Sensor resolution = 4315 x 3244

TZ1 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 4.90
r = 5.75/4.32 = 1.33
X = √  4.90 × 1000000  = 1919
1.33
Resolution horizontal: X × r = 1919 × 1.33 = 2552
Resolution vertical: X = 1919

Sensor resolution = 2552 x 1919


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


Luxmedia 14-Z51 crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

TZ1 crop factor

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

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).

Luxmedia 14-Z51 equivalent aperture

Crop factor = 5.62
Aperture = f2.5 - f6.3

35-mm equivalent aperture = (f2.5 - f6.3) × 5.62 = f14.1 - f35.4

TZ1 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f4.2

35-mm equivalent aperture = (f2.8 - f4.2) × 6.02 = f16.9 - f25.3

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