Panasonic Lumix DMC-GX8 vs. Sony Cyber-shot DSC-RX100 IV

Comparison

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Lumix DMC-GX8 image
vs
Cyber-shot DSC-RX100 IV image
Panasonic Lumix DMC-GX8 Sony Cyber-shot DSC-RX100 IV
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Megapixels
20.30
20.10
Max. image resolution
5184 x 3888
5472 x 3648

Sensor

Sensor type
CMOS
CMOS
Sensor size
Four Thirds (17.3 x 13 mm)
13.2 x 8.8 mm
Sensor resolution
5196 x 3907
5492 x 3661
Diagonal
21.64 mm
15.86 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
1.94 : 1
(ratio)
Panasonic Lumix DMC-GX8 Sony Cyber-shot DSC-RX100 IV
Surface area:
224.90 mm² vs 116.16 mm²
Difference: 108.74 mm² (94%)
GX8 sensor is approx. 1.94x bigger than RX100 IV sensor.
Pixel pitch
3.33 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.
Difference: 0.93 µm (39%)
Pixel pitch of GX8 is approx. 39% higher than pixel pitch of RX100 IV.
Pixel area
11.09 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:
vs
Pixel area difference: 5.33 µm² (93%)
A pixel on Panasonic GX8 sensor is approx. 93% bigger than a pixel on Sony RX100 IV.
Pixel density
9.02 MP/cm²
17.31 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: 8.29 µm (92%)
Sony RX100 IV has approx. 92% higher pixel density than Panasonic GX8.
To learn about the accuracy of these numbers, click here.



Specs

Panasonic GX8
Sony RX100 IV
Crop factor
2
2.73
Total megapixels
21.77
21.00
Effective megapixels
20.30
20.10
Optical zoom
2.9x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 200-25600
Auto, 125-12800
RAW
Manual focus
Normal focus range
5 cm
Macro focus range
5 cm
Focal length (35mm equiv.)
24 - 70 mm
Aperture priority
Yes
Yes
Max. aperture
f1.8 - f2.8
Max. aperture (35mm equiv.)
n/a
f4.9 - f7.6
Metering
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±5 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
60 sec
30 sec
Max. shutter speed
1/16000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Electronic
Electronic
White balance presets
5
9
Screen size
3"
3"
Screen resolution
1,040,000 dots
1,228,800 dots
Video capture
Max. video resolution
3840x2160 (30p/24p)
3840x2160 (30p/25p/24p)
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC, Memory Stick Pro Duo/Pro-HG Duo/PRO-HG HX Duo
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Li-ion Battery Pack
NP-BX1 lithium-ion battery
Weight
487 g
298 g
Dimensions
133.2 x 77.9 x 63.1 mm
101.6 x 58.1 x 41 mm
Year
2015
2015




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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 GX8 diagonal

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

Sony RX100 IV 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.

GX8 sensor area

Width = 17.30 mm
Height = 13.00 mm

Surface area = 17.30 × 13.00 = 224.90 mm²

RX100 IV sensor 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

GX8 pixel pitch

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

RX100 IV pixel pitch

Sensor width = 13.20 mm
Sensor resolution width = 5492 pixels
Pixel pitch =   13.20  × 1000  = 2.4 µm
5492


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

GX8 pixel area

Pixel pitch = 3.33 µm

Pixel area = 3.33² = 11.09 µm²

RX100 IV 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

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

GX8 pixel density

Sensor resolution width = 5196 pixels
Sensor width = 1.73 cm

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

RX100 IV pixel density

Sensor resolution width = 5492 pixels
Sensor width = 1.32 cm

Pixel density = (5492 / 1.32)² / 1000000 = 17.31 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

GX8 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

RX100 IV sensor resolution

Sensor width = 13.20 mm
Sensor height = 8.80 mm
Effective megapixels = 20.10
r = 13.20/8.80 = 1.5
X =  20.10 × 1000000  = 3661
1.5
Resolution horizontal: X × r = 3661 × 1.5 = 5492
Resolution vertical: X = 3661

Sensor resolution = 5492 x 3661


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


GX8 crop factor

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

RX100 IV 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).

GX8 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 GX8, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Panasonic GX8 is 2

RX100 IV equivalent aperture

Crop factor = 2.73
Aperture = f1.8 - f2.8

35-mm equivalent aperture = (f1.8 - f2.8) × 2.73 = f4.9 - f7.6

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