Olympus OM-D E-M5 Mark III vs Sony Cyber-shot DSC-RX100 Comparison

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OM-D E-M5 Mark III image
vs
Cyber-shot DSC-RX100 image
Olympus OM-D E-M5 Mark III Sony Cyber-shot DSC-RX100
Megapixels
20.40
20.20
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
5208 x 3916
5505 x 3670
Diagonal
21.64 mm
15.86 mm
Compare sensor size:

Sensor Size

Actual size is set to screen
vs
1.94:1
(ratio)
Olympus OM-D E-M5 Mark III Sony Cyber-shot DSC-RX100
Surface area:
224.90 mm² vs 116.16 mm²
Difference: 108.74 mm² (94%)
OM-D E-M5 Mark III sensor is ~1.94x bigger than RX100's.
Note: You are comparing sensors of very different generations. There is a gap of 7 years between Olympus OM-D E-M5 Mark III (2019) and Sony RX100 (2012). Seven years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
3.32 µm
2.4 µm
Difference: 0.92 µm (38%)
Pixel pitch of OM-D E-M5 Mark III is ~38% higher than RX100's.
Pixel area
11.02 µm²
5.76 µm²
Relative pixel sizes:
vs
Pixel area difference: 5.26 µm² (91%)
Pixel on Olympus OM-D E-M5 Mark III sensor is ~91% bigger than Sony RX100's.
Pixel density
9.06 MP/cm²
17.39 MP/cm²
Difference: 8.33 µm (92%)
Sony RX100 has ~92% higher pixel density than Olympus OM-D E-M5 Mark III's.

Specs

Olympus OM-D E-M5 Mark III
Sony RX100
Crop factor
2
2.73
Megapixels
21.80
20.90
Optical zoom
 
3.6x
Digital zoom
ISO range
Auto, 64-25600
Auto, 80, 100, 125, 200, 400, 800, 1600, 3200, 6400
RAW support
Manual focus
Focus range
n/a
Macro focus range
n/a
5 cm
Focal length
n/a
28 - 100 mm
Aperture priority
Max. aperture
n/a
f1.8 - f4.9
Metering types
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±5 EV (in 1/3 EV, 1/2 EV, 1 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Shutter speed (min)
60s
30s
Shutter speed (max)
1/32000s
1/2000s
Built-in flash
External flash
Viewfinder type
Electronic
None
White balance
7
9
Screen size
3"
3"
Screen resolution
1,037,000 dots
1,228,800 dots
Video available
Video resolution
4096x2160
1920x1080
Video modes
24p
60p
Storage type
SD/SDHC/SDXC
SD/SDHC/SDXC, Memory Stick Duo/Pro Duo/Pro-HG Duo
USB Version
2.0 (480 Mbit/sec)
2.0 (480 Mbit/sec)
HDMI
Wireless support
GPS
Battery model
BLS-50
Lithium-Ion
Battery type
lithium-ion
NP-BX1
Weight
414g
213g
Body size
125.3 x 85.2 x 49.7 mm
102 x 59 x 36 mm
Released
2019
2012


Compare various cameras

vs

Diagonal

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

Olympus OM-D E-M5 Mark III diagonal

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

Sony 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.

OM-D E-M5 Mark III sensor area

Width = 17.30 mm
Height = 13.00 mm

Surface area = 17.30 × 13.00 = 224.90 mm²

RX100 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

OM-D E-M5 Mark III pixel pitch

Sensor width = 17.30 mm
Sensor resolution width = 5208 pixels
Pixel pitch =   17.30  × 1000  = 3.32 µm
5208

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

OM-D E-M5 Mark III pixel area

Pixel pitch = 3.32 µm

Pixel area = 3.32² = 11.02 µm²

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

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

OM-D E-M5 Mark III pixel density

Sensor resolution width = 5208 pixels
Sensor width = 1.73 cm

Pixel density = (5208 / 1.73)² / 1000000 = 9.06 MP/cm²

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.

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

OM-D E-M5 Mark III sensor resolution

Sensor width = 17.30 mm
Sensor height = 13.00 mm
Effective megapixels = 20.40
r = 17.30/13.00 = 1.33
X =  20.40 × 1000000  = 3916
1.33
Resolution horizontal: X × r = 3916 × 1.33 = 5208
Resolution vertical: X = 3916

Sensor resolution = 5208 x 3916

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


OM-D E-M5 Mark III crop factor

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

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).

OM-D E-M5 Mark III 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 Olympus OM-D E-M5 Mark III, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Olympus OM-D E-M5 Mark III is 2

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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