Olympus OM-D E-M5 Mark III vs Panasonic Lumix DMC-GX85 Comparison

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OM-D E-M5 Mark III image
vs
Lumix DMC-GX85 image
Olympus OM-D E-M5 Mark III Panasonic Lumix DMC-GX85
Megapixels
20.40
16.00
Image resolution
5184 x 3888
4592 x 3448

Sensor

Sensor type
CMOS
CMOS
Sensor size
Four Thirds (17.3 x 13 mm)
Four Thirds (17.3 x 13 mm)
Sensor resolution
5208 x 3916
4612 x 3468
Diagonal
21.64 mm
21.64 mm
Compare sensor size:

Sensor Size

Actual size is set to screen
vs
1:1
(ratio)
Olympus OM-D E-M5 Mark III Panasonic Lumix DMC-GX85
Surface area:
224.90 mm² vs 224.90 mm²
Difference: 0 mm² (0%)
OM-D E-M5 Mark III and GX85 sensors are the same size.
Note: You are comparing cameras of different generations. There is a 3 year gap between Olympus OM-D E-M5 Mark III (2019) and Panasonic GX85 (2016). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
3.32 µm
3.75 µm
Difference: 0.43 µm (13%)
Pixel pitch of GX85 is ~13% higher than OM-D E-M5 Mark III's.
Pixel area
11.02 µm²
14.06 µm²
Relative pixel sizes:
vs
Pixel area difference: 3.04 µm² (28%)
Pixel on Panasonic GX85 sensor is ~28% bigger than Olympus OM-D E-M5 Mark III's.
Pixel density
9.06 MP/cm²
7.11 MP/cm²
Difference: 1.95 µm (27%)
Olympus OM-D E-M5 Mark III has ~27% higher pixel density than Panasonic GX85's.

Specs

Olympus OM-D E-M5 Mark III
Panasonic GX85
Crop factor
2
2
Megapixels
21.80
16.84
Optical zoom
 
Digital zoom
ISO range
Auto, 64-25600
Auto, 200-25600 (extends to 100)
RAW support
Manual focus
Focus range
n/a
Macro focus range
n/a
Focal length
n/a
Aperture priority
Max. aperture
n/a
Metering types
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±5 EV (in 1/3 EV, 1/2 EV, 1 EV steps)
±5 EV (in 1/3 EV steps)
Shutter priority
Shutter speed (min)
60s
60s
Shutter speed (max)
1/32000s
1/4000s
Built-in flash
External flash
Viewfinder type
Electronic
Electronic
White balance
7
5
Screen size
3"
3"
Screen resolution
1,037,000 dots
1,040,000 dots
Video available
Video resolution
4096x2160
3840x2160
Video modes
24p
30p/24p
Storage type
SD/SDHC/SDXC
SD/SDHC/SDXC
USB Version
2.0 (480 Mbit/sec)
2.0 (480 Mbit/sec)
HDMI
Wireless support
GPS
Battery
BLS-50 lithium-ion battery
Lithium-ion battery
Weight
414g
426g
Body size
125.3 x 85.2 x 49.7 mm
122 x 70.6 x 43.9 mm
Released
2019
2016


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

Panasonic GX85 diagonal

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

GX85 sensor area

Width = 17.30 mm
Height = 13.00 mm

Surface area = 17.30 × 13.00 = 224.90 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

GX85 pixel pitch

Sensor width = 17.30 mm
Sensor resolution width = 4612 pixels
Pixel pitch =   17.30  × 1000  = 3.75 µm
4612


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

GX85 pixel area

Pixel pitch = 3.75 µm

Pixel area = 3.75² = 14.06 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

GX85 pixel density

Sensor resolution width = 4612 pixels
Sensor width = 1.73 cm

Pixel density = (4612 / 1.73)² / 1000000 = 7.11 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

GX85 sensor resolution

Sensor width = 17.30 mm
Sensor height = 13.00 mm
Effective megapixels = 16.00
r = 17.30/13.00 = 1.33
X =  16.00 × 1000000  = 3468
1.33
Resolution horizontal: X × r = 3468 × 1.33 = 4612
Resolution vertical: X = 3468

Sensor resolution = 4612 x 3468


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

GX85 crop factor

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

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

GX85 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 GX85, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Panasonic GX85 is 2

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