Panasonic Lumix DMC-FX100 vs. Panasonic Lumix DMC-TZ31

Comparison

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Lumix DMC-FX100 image
vs
Lumix DMC-TZ31 image
Panasonic Lumix DMC-FX100 Panasonic Lumix DMC-TZ31
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Megapixels
12.00
14.10
Max. image resolution
4000 x 3000
4320 x 3240

Sensor

Sensor type
CCD
CMOS
Sensor size
1/1.72" (~ 7.44 x 5.58 mm)
1/2.33" (~ 6.08 x 4.56 mm)
Sensor resolution
3995 x 3004
4330 x 3256
Diagonal
9.30 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
1.5 : 1
(ratio)
Panasonic Lumix DMC-FX100 Panasonic Lumix DMC-TZ31
Surface area:
41.52 mm² vs 27.72 mm²
Difference: 13.8 mm² (50%)
FX100 sensor is approx. 1.5x bigger than TZ31 sensor.
Note: You are comparing cameras of different generations. There is a 5 year gap between Panasonic FX100 (2007) and Panasonic TZ31 (2012). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.86 µm
1.4 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 (33%)
Pixel pitch of FX100 is approx. 33% higher than pixel pitch of TZ31.
Pixel area
3.46 µm²
1.96 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: 1.5 µm² (77%)
A pixel on Panasonic FX100 sensor is approx. 77% bigger than a pixel on Panasonic TZ31.
Pixel density
28.83 MP/cm²
50.72 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: 21.89 µm (76%)
Panasonic TZ31 has approx. 76% higher pixel density than Panasonic FX100.
To learn about the accuracy of these numbers, click here.



Specs

Panasonic FX100
Panasonic TZ31
Crop factor
4.65
5.69
Total megapixels
12.40
15.30
Effective megapixels
12.00
14.10
Optical zoom
3.6x
20x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400, 800, 1250, 1600
Auto, Hi Auto, (1600-6400), 100, 200, 400, 800, 1600. 3200
RAW
Manual focus
Normal focus range
50 cm
50 cm
Macro focus range
5 cm
3 cm
Focal length (35mm equiv.)
28 - 100 mm
24 - 480 mm
Aperture priority
No
Yes
Max. aperture
f2.8 - f5.6
f3.3 - f6.4
Max. aperture (35mm equiv.)
f13 - f26
f18.8 - f36.4
Metering
Centre weighted, Intelligent Multiple, 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
Yes
Min. shutter speed
60 sec
15 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
7
4
Screen size
2.5"
3"
Screen resolution
207,000 dots
460,000 dots
Video capture
Max. video resolution
1920x1080 (50p)
Storage types
MultiMedia, SDHC, Secure Digital
SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable
Li-Ion
Weight
148 g
206 g
Dimensions
96.7 x 54 x 24.5 mm
105 x 59 x 28 mm
Year
2007
2012




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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

Panasonic FX100 diagonal

The diagonal of FX100 sensor is not 1/1.72 or 0.58" (14.8 mm) as you might expect, but approximately two thirds of that value - 9.3 mm. If you want to know why, see sensor sizes.

w = 7.44 mm
h = 5.58 mm
Diagonal = √  7.44² + 5.58²   = 9.30 mm

Panasonic TZ31 diagonal

The diagonal of TZ31 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.

FX100 sensor area

Width = 7.44 mm
Height = 5.58 mm

Surface area = 7.44 × 5.58 = 41.52 mm²

TZ31 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

FX100 pixel pitch

Sensor width = 7.44 mm
Sensor resolution width = 3995 pixels
Pixel pitch =   7.44  × 1000  = 1.86 µm
3995

TZ31 pixel pitch

Sensor width = 6.08 mm
Sensor resolution width = 4330 pixels
Pixel pitch =   6.08  × 1000  = 1.4 µm
4330


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

FX100 pixel area

Pixel pitch = 1.86 µm

Pixel area = 1.86² = 3.46 µm²

TZ31 pixel area

Pixel pitch = 1.4 µm

Pixel area = 1.4² = 1.96 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

FX100 pixel density

Sensor resolution width = 3995 pixels
Sensor width = 0.744 cm

Pixel density = (3995 / 0.744)² / 1000000 = 28.83 MP/cm²

TZ31 pixel density

Sensor resolution width = 4330 pixels
Sensor width = 0.608 cm

Pixel density = (4330 / 0.608)² / 1000000 = 50.72 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

FX100 sensor resolution

Sensor width = 7.44 mm
Sensor height = 5.58 mm
Effective megapixels = 12.00
r = 7.44/5.58 = 1.33
X = √  12.00 × 1000000  = 3004
1.33
Resolution horizontal: X × r = 3004 × 1.33 = 3995
Resolution vertical: X = 3004

Sensor resolution = 3995 x 3004

TZ31 sensor resolution

Sensor width = 6.08 mm
Sensor height = 4.56 mm
Effective megapixels = 14.10
r = 6.08/4.56 = 1.33
X = √  14.10 × 1000000  = 3256
1.33
Resolution horizontal: X × r = 3256 × 1.33 = 4330
Resolution vertical: X = 3256

Sensor resolution = 4330 x 3256


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


FX100 crop factor

Sensor diagonal in mm = 9.30 mm
Crop factor =   43.27  = 4.65
9.30

TZ31 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).

FX100 equivalent aperture

Crop factor = 4.65
Aperture = f2.8 - f5.6

35-mm equivalent aperture = (f2.8 - f5.6) × 4.65 = f13 - f26

TZ31 equivalent aperture

Crop factor = 5.69
Aperture = f3.3 - f6.4

35-mm equivalent aperture = (f3.3 - f6.4) × 5.69 = f18.8 - f36.4

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