Fujifilm X20 vs. Sony Cybershot DSC RX100

Comparison

X20 image
vs.
Cybershot DSC RX100 image

 

Fujifilm X20 Sony Cybershot DSC RX100
Megapixels
12.00 20.20
Max. resolution
4000 x 3000 5472 x 3648
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
CMOS CMOS
Sensor size
2/3" (~ 8.8 x 6.6 mm) 13.2 x 8.8 mm
Sensor resolution
3995 x 3004  5505 x 3670 
Diagonal
11.00 mm  15.86 mm 
Surface area
58.08 mm²  116.16 mm² 
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 sizes:
Fujifilm X20
vs.
Sony Cybershot DSC RX100
 
Surface area:
Fujifilm X20
Sony Cybershot DSC RX100
Difference: 58.08 mm² (100%)
Sony Cybershot DSC RX100 has approx. 100% more surface area than Fujifilm X20.
Pixel pitch
2.2 µm  2.4 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.
Pixel pitch
Fujifilm X20
Sony Cybershot DSC RX100
Difference: 0.2 µm (9%)
Pixel pitch of Sony Cybershot DSC RX100 is approx. 9% higher than pixel pitch of Fujifilm X20.
Pixel area
4.84 µm²  5.76 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:
Fujifilm X20
vs.
Sony Cybershot DSC RX100
Pixel area difference: 0.92 µm² (19%)
A pixel on Sony Cybershot DSC RX100 sensor is approx. 19% bigger than a pixel on Fujifilm X20.
Pixel density
20.61 MP/cm²  17.39 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.
Pixel density
Fujifilm X20
Sony Cybershot DSC RX100
Difference: 3.22 MP/cm² (19%)
Fujifilm X20 has approx. 19% higher pixel density than Sony Cybershot DSC RX100.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
3.93  2.73 
Total megapixels
n/a 20.90
Effective megapixels
12.00 20.20
Optical zoom
4x 3.6x
Digital zoom
Yes Yes
Iso
Auto, 100, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000, 5000, 6400, 12800 Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600
Auto focus
Yes Yes
Manual focus
Yes Yes
Normal focus range
50 cm n/a
Macro focus range
1 cm 5 cm
Focal length (35mm equiv.)
28 - 112 mm 28 - 100 mm
Aperture priority
Yes Yes
Aperture
f2.0 - f2.8 f1.8 - f4.9
Aperture (35mm equiv.)
f7.9 - f11  f4.9 - f13.4 
Metering
Multi, Average, Spot Multi, Center-weighted, Spot
Exposure compensation
±2 EV (at 1/3 EV steps) ±3 EV (at 1/3 EV steps)
Shutter priority
Yes Yes
Min. shutter speed
30 sec 30 sec
Max. shutter speed
1/4000 sec 1/2000 sec
Flash modes
Auto, On, Off, Red-Eye, Slow Sync Auto, On, Off, Slow Sync
Built-in flash
Yes Yes
External flash
Yes No
Viewfinder
Optical (tunnel) None
White balance presets
7 9
LCD display
Yes Yes
LCD size
2.8" 3"
LCD resolution
460,000 1,228,800
Min. image resolution
1536 x 1536 2592 x 1944
Selftimer
Yes Yes
Storage types
SD/SDHC/SDXC SD/SDHC/SDXC, Memory Stick Duo/Pro Duo/Pro-HG Duo
USB
USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
Batteries
Lithium-Ion NP-50 rechargeable battery & charger Lithium-Ion NP-BX1 battery and charger
Weight
353 g 213g
Dimensions
117 x 69.6 x 56.8 mm 102x59x36 mm
Year
2013 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

Fujifilm X20 diagonal

The diagonal of Fujifilm X20 image sensor is not 2/3 inch as you might expect, but approximately two thirds of that value. If you want to know why, see sensor sizes.

w = 8.80 mm
h = 6.60 mm
Diagonal =  8.80² + 6.60²   = 11.00 mm

Sony Cybershot DSC RX100 diagonal

w = 13.20 mm
h = 8.80 mm
Diagonal =  13.20² + 8.80²   = 15.86 mm


Surface area

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

Fujifilm X20 surface area

Width = 8.80 mm
Height = 6.60 mm

Surface area = 8.80 × 6.60 = 58.08 mm²

Sony Cybershot DSC RX100 surface area

Width = 13.20 mm
Height = 8.80 mm

Surface area = 13.20 × 8.80 = 116.16 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

Fujifilm X20 pixel pitch

Sensor width = 8.80 mm
Sensor resolution width = 3995 pixels
Pixel pitch =   8.80  × 1000  = 2.2 µm
3995

Sony Cybershot DSC RX100 pixel pitch

Sensor width = 13.20 mm
Sensor resolution width = 5505 pixels
Pixel pitch =   13.20  × 1000  = 2.4 µm
5505


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

Fujifilm X20 pixel area

Pixel pitch = 2.2 µm

Pixel area = 2.2² = 4.84 µm²

Sony Cybershot DSC RX100 pixel area

Pixel pitch = 2.4 µm

Pixel area = 2.4² = 5.76 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

You could also use this formula:
Pixel density =   effective megapixels × 1000000  / 10000
sensor surface area in mm²

Fujifilm X20 pixel density

Sensor resolution width = 3995 pixels
Sensor width = 0.88 cm

Pixel density = (3995 / 0.88)² / 1000000 = 20.61 MP/cm²

Sony Cybershot DSC RX100 pixel density

Sensor resolution width = 5505 pixels
Sensor width = 1.32 cm

Pixel density = (5505 / 1.32)² / 1000000 = 17.39 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. 22.8 × 15.5 sensor for example has a ratio of 1.47.

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

Fujifilm X20 sensor resolution

Sensor width = 8.80 mm
Sensor height = 6.60 mm
Effective megapixels = 12.00
r = 8.80/6.60 = 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

Sony Cybershot DSC RX100 sensor resolution

Sensor width = 13.20 mm
Sensor height = 8.80 mm
Effective megapixels = 20.20
r = 13.20/8.80 = 1.5
X =  20.20 × 1000000  = 3670
1.5
Resolution horizontal: X × r = 3670 × 1.5 = 5505
Resolution vertical: X = 3670

Sensor resolution = 5505 x 3670


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


Fujifilm X20 crop factor

Sensor diagonal in mm = 11.00 mm
Crop factor =   43.27  = 3.93
11.00

Sony Cybershot DSC RX100 crop factor

Sensor diagonal in mm = 15.86 mm
Crop factor =   43.27  = 2.73
15.86

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).

Fujifilm X20 equivalent aperture

Crop factor = 3.93
Aperture = f2.0 - f2.8

35-mm equivalent aperture = (f2.0 - f2.8) × 3.93 = f7.9 - f11

Sony Cybershot DSC RX100 equivalent aperture

Crop factor = 2.73
Aperture = f1.8 - f4.9

35-mm equivalent aperture = (f1.8 - f4.9) × 2.73 = f4.9 - f13.4


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