Panasonic Lumix DC-G90 vs. Fujifilm FinePix F31fd

Comparison

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Lumix DC-G90 image
vs
FinePix F31fd image
Panasonic Lumix DC-G90 Fujifilm FinePix F31fd
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Megapixels
20.30
6.10
Max. image resolution
5184 x 3888
2848 x 2136

Sensor

Sensor type
CMOS
CCD
Sensor size
Four Thirds (17.3 x 13 mm)
1/1.7" (~ 7.53 x 5.64 mm)
Sensor resolution
5196 x 3907
2860 x 2134
Diagonal
21.64 mm
9.41 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
5.3 : 1
(ratio)
Panasonic Lumix DC-G90 Fujifilm FinePix F31fd
Surface area:
224.90 mm² vs 42.47 mm²
Difference: 182.43 mm² (430%)
Lumix DC-G90 sensor is approx. 5.3x bigger than F31fd sensor.
Note: You are comparing sensors of vastly different generations. There is a gap of 13 years between Panasonic Lumix DC-G90 (2019) and Fujifilm F31fd (2006). Thirteen years is a huge amount of time, technology wise, resulting in newer sensor being much more efficient than the older one.
Pixel pitch
3.33 µm
2.63 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: 0.7 µm (27%)
Pixel pitch of Lumix DC-G90 is approx. 27% higher than pixel pitch of F31fd.
Pixel area
11.09 µm²
6.92 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: 4.17 µm² (60%)
A pixel on Panasonic Lumix DC-G90 sensor is approx. 60% bigger than a pixel on Fujifilm F31fd.
Pixel density
9.02 MP/cm²
14.43 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: 5.41 µm (60%)
Fujifilm F31fd has approx. 60% higher pixel density than Panasonic Lumix DC-G90.
To learn about the accuracy of these numbers, click here.



Specs

Panasonic Lumix DC-G90
Fujifilm F31fd
Crop factor
2
4.6
Total megapixels
21.77
6.30
Effective megapixels
20.30
6.10
Optical zoom
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 200-25600 (extends to 100)
Auto, 100, 200, 400, 800, 1600, 3200
RAW
Manual focus
Normal focus range
60 cm
Macro focus range
5 cm
Focal length (35mm equiv.)
36 - 108 mm
Aperture priority
Yes
Yes
Max. aperture
f2.8 - f5
Max. aperture (35mm equiv.)
n/a
f12.9 - f23
Metering
Multi, Center-weighted, Spot
256-segment Matrix, Multi Spot, Spot
Exposure compensation
±5 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
60 sec
15 sec
Max. shutter speed
1/4000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Electronic
None
White balance presets
5
6
Screen size
3"
2.5"
Screen resolution
1,240,000 dots
230,000 dots
Video capture
Max. video resolution
3840x2160 (30p/24p)
Storage types
SD/SDHC/SDXC
xD Picture card
USB
USB 2.0 (480 Mbit/sec)
USB 1.0
HDMI
Wireless
GPS
Battery
Li-ion Battery Pack
Lithium-Ion (NP-95)
Weight
533 g
155 g
Dimensions
130.4 x 93.5 x 77.4 mm
92.7 x 56.7 x 27.8 mm
Year
2019
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

Panasonic Lumix DC-G90 diagonal

w = 17.30 mm
h = 13.00 mm
Diagonal =  17.30² + 13.00²   = 21.64 mm

Fujifilm F31fd diagonal

The diagonal of F31fd sensor is not 1/1.7 or 0.59" (14.9 mm) as you might expect, but approximately two thirds of that value - 9.41 mm. If you want to know why, see sensor sizes.

w = 7.53 mm
h = 5.64 mm
Diagonal =  7.53² + 5.64²   = 9.41 mm


Surface area

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

Lumix DC-G90 sensor area

Width = 17.30 mm
Height = 13.00 mm

Surface area = 17.30 × 13.00 = 224.90 mm²

F31fd sensor area

Width = 7.53 mm
Height = 5.64 mm

Surface area = 7.53 × 5.64 = 42.47 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

Lumix DC-G90 pixel pitch

Sensor width = 17.30 mm
Sensor resolution width = 5196 pixels
Pixel pitch =   17.30  × 1000  = 3.33 µm
5196

F31fd pixel pitch

Sensor width = 7.53 mm
Sensor resolution width = 2860 pixels
Pixel pitch =   7.53  × 1000  = 2.63 µm
2860


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

Lumix DC-G90 pixel area

Pixel pitch = 3.33 µm

Pixel area = 3.33² = 11.09 µm²

F31fd pixel area

Pixel pitch = 2.63 µm

Pixel area = 2.63² = 6.92 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

Lumix DC-G90 pixel density

Sensor resolution width = 5196 pixels
Sensor width = 1.73 cm

Pixel density = (5196 / 1.73)² / 1000000 = 9.02 MP/cm²

F31fd pixel density

Sensor resolution width = 2860 pixels
Sensor width = 0.753 cm

Pixel density = (2860 / 0.753)² / 1000000 = 14.43 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

Lumix DC-G90 sensor resolution

Sensor width = 17.30 mm
Sensor height = 13.00 mm
Effective megapixels = 20.30
r = 17.30/13.00 = 1.33
X =  20.30 × 1000000  = 3907
1.33
Resolution horizontal: X × r = 3907 × 1.33 = 5196
Resolution vertical: X = 3907

Sensor resolution = 5196 x 3907

F31fd sensor resolution

Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 6.10
r = 7.53/5.64 = 1.34
X =  6.10 × 1000000  = 2134
1.34
Resolution horizontal: X × r = 2134 × 1.34 = 2860
Resolution vertical: X = 2134

Sensor resolution = 2860 x 2134


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


Lumix DC-G90 crop factor

Sensor diagonal in mm = 21.64 mm
Crop factor =   43.27  = 2
21.64

F31fd crop factor

Sensor diagonal in mm = 9.41 mm
Crop factor =   43.27  = 4.6
9.41

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).

Lumix DC-G90 equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Panasonic Lumix DC-G90, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Panasonic Lumix DC-G90 is 2

F31fd equivalent aperture

Crop factor = 4.6
Aperture = f2.8 - f5

35-mm equivalent aperture = (f2.8 - f5) × 4.6 = f12.9 - f23

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