Panasonic Lumix DMC-FX7 vs. Nikon Coolpix 2500

Comparison

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Lumix DMC-FX7 image
vs
Coolpix 2500 image
Panasonic Lumix DMC-FX7 Nikon Coolpix 2500
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Megapixels
4.90
1.90
Max. image resolution
2560 x 1920
1600 x 1200

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/2.7" (~ 5.33 x 4 mm)
Sensor resolution
2552 x 1919
1589 x 1195
Diagonal
7.19 mm
6.66 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
1.17 : 1
(ratio)
Panasonic Lumix DMC-FX7 Nikon Coolpix 2500
Surface area:
24.84 mm² vs 21.32 mm²
Difference: 3.52 mm² (17%)
FX7 sensor is approx. 1.17x bigger than 2500 sensor.
Note: You are comparing cameras of different generations. There is a 2 year gap between Panasonic FX7 (2004) and Nikon 2500 (2002). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
2.25 µm
3.35 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: 1.1 µm (49%)
Pixel pitch of 2500 is approx. 49% higher than pixel pitch of FX7.
Pixel area
5.06 µm²
11.22 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: 6.16 µm² (122%)
A pixel on Nikon 2500 sensor is approx. 122% bigger than a pixel on Panasonic FX7.
Pixel density
19.7 MP/cm²
8.89 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: 10.81 µm (122%)
Panasonic FX7 has approx. 122% higher pixel density than Nikon 2500.
To learn about the accuracy of these numbers, click here.



Specs

Panasonic FX7
Nikon 2500
Crop factor
6.02
6.5
Total megapixels
5.40
2.10
Effective megapixels
4.90
1.90
Optical zoom
3x
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400
Auto, (100-400)
RAW
Manual focus
Normal focus range
50 cm
30 cm
Macro focus range
5 cm
4 cm
Focal length (35mm equiv.)
35 - 105 mm
37 - 111 mm
Aperture priority
Yes
No
Max. aperture
f2.8 - f5
f2.7 - f4.7
Max. aperture (35mm equiv.)
f16.9 - f30.1
f17.6 - f30.6
Metering
Centre weighted
256-segment Matrix
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
8 sec
2 sec
Max. shutter speed
1/2000 sec
1/3000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
6
6
Screen size
2.5"
1.5"
Screen resolution
114,000 dots
110,000 dots
Video capture
Max. video resolution
Storage types
Secure Digital
CompactFlash type I
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable
Nikon EN-EL2 Lithium-Ion included
Weight
135 g
205 g
Dimensions
94 x 50 x 24 mm
60 x 114 x 32 mm
Year
2004
2002




Choose cameras to compare

vs

Diagonal

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

Panasonic FX7 diagonal

The diagonal of FX7 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

Nikon 2500 diagonal

The diagonal of 2500 sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of that value - 6.66 mm. If you want to know why, see sensor sizes.

w = 5.33 mm
h = 4.00 mm
Diagonal =  5.33² + 4.00²   = 6.66 mm


Surface area

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

FX7 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

2500 sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 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

FX7 pixel pitch

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

2500 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 1589 pixels
Pixel pitch =   5.33  × 1000  = 3.35 µm
1589


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

FX7 pixel area

Pixel pitch = 2.25 µm

Pixel area = 2.25² = 5.06 µm²

2500 pixel area

Pixel pitch = 3.35 µm

Pixel area = 3.35² = 11.22 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

FX7 pixel density

Sensor resolution width = 2552 pixels
Sensor width = 0.575 cm

Pixel density = (2552 / 0.575)² / 1000000 = 19.7 MP/cm²

2500 pixel density

Sensor resolution width = 1589 pixels
Sensor width = 0.533 cm

Pixel density = (1589 / 0.533)² / 1000000 = 8.89 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

FX7 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

2500 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 1.90
r = 5.33/4.00 = 1.33
X =  1.90 × 1000000  = 1195
1.33
Resolution horizontal: X × r = 1195 × 1.33 = 1589
Resolution vertical: X = 1195

Sensor resolution = 1589 x 1195


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


FX7 crop factor

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

2500 crop factor

Sensor diagonal in mm = 6.66 mm
Crop factor =   43.27  = 6.5
6.66

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).

FX7 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5

35-mm equivalent aperture = (f2.8 - f5) × 6.02 = f16.9 - f30.1

2500 equivalent aperture

Crop factor = 6.5
Aperture = f2.7 - f4.7

35-mm equivalent aperture = (f2.7 - f4.7) × 6.5 = f17.6 - f30.6

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