Panasonic Lumix DC-GH7 vs. Sony a7CR

Comparison

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Lumix DC-GH7 image
vs
a7CR image
Panasonic Lumix DC-GH7 Sony a7CR
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Megapixels
25.20
61.00
Max. image resolution
5776 x 4336
9504 x 6336

Sensor

Sensor type
CMOS
CMOS
Sensor size
Four Thirds (17.3 x 13 mm)
35.7 x 23.8 mm
Sensor resolution
5789 x 4353
9566 x 6377
Diagonal
21.64 mm
42.91 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 : 3.78
(ratio)
Panasonic Lumix DC-GH7 Sony a7CR
Surface area:
224.90 mm² vs 849.66 mm²
Difference: 624.76 mm² (278%)
a7CR sensor is approx. 3.78x bigger than Lumix DC-GH7 sensor.
Pixel pitch
2.99 µm
3.73 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: 0.74 µm (25%)
Pixel pitch of a7CR is approx. 25% higher than pixel pitch of Lumix DC-GH7.
Pixel area
8.94 µm²
13.91 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: 4.97 µm² (56%)
A pixel on Sony a7CR sensor is approx. 56% bigger than a pixel on Panasonic Lumix DC-GH7.
Pixel density
11.2 MP/cm²
7.18 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: 4.02 µm (56%)
Panasonic Lumix DC-GH7 has approx. 56% higher pixel density than Sony a7CR.
To learn about the accuracy of these numbers, click here.



Specs

Panasonic Lumix DC-GH7
Sony a7CR
Crop factor
2
1.01
Total megapixels
26.50
62.50
Effective megapixels
25.20
61.00
Optical zoom
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100-25600 (extends to 50)
Auto, 100-32000 (extends to 50-102400)
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Max. aperture (35mm equiv.)
n/a
n/a
Metering
Multi, Center-weighted, Highlight-weighted, Spot
Multi, Center-weighted, Highlight-weighted, Average, Spot
Exposure compensation
±5 EV (in 1/3 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
60 sec
30 sec
Max. shutter speed
1/32000 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
Electronic
Electronic
White balance presets
6
9
Screen size
3"
3"
Screen resolution
1,840,000 dots
1,036,800 dots
Video capture
Max. video resolution
5760x4320 (30p/​25p/​24p)
3840x2160 (60/50/30/25/24)
Storage types
SD/SDHC/SDXC, CFexpress
SD/SDHC/SDXC (UHS-II)
USB
USB 3.2 (10 GBit/sec)
USB 3.0 (5 GBit/sec)
HDMI
Wireless
GPS
Battery
DMW-BLK22 Rechargeable Lithium-Ion battery
NP-FZ100 lithium-ion battery
Weight
805 g
515 g
Dimensions
138.4 x 100.3 x 99.6 mm
124 x 71.1 x 63.4 mm
Year
2024
2023




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vs

Diagonal

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

Panasonic Lumix DC-GH7 diagonal

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

Sony a7CR diagonal

w = 35.70 mm
h = 23.80 mm
Diagonal =  35.70² + 23.80²   = 42.91 mm


Surface area

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

Lumix DC-GH7 sensor area

Width = 17.30 mm
Height = 13.00 mm

Surface area = 17.30 × 13.00 = 224.90 mm²

a7CR sensor area

Width = 35.70 mm
Height = 23.80 mm

Surface area = 35.70 × 23.80 = 849.66 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-GH7 pixel pitch

Sensor width = 17.30 mm
Sensor resolution width = 5789 pixels
Pixel pitch =   17.30  × 1000  = 2.99 µm
5789

a7CR pixel pitch

Sensor width = 35.70 mm
Sensor resolution width = 9566 pixels
Pixel pitch =   35.70  × 1000  = 3.73 µm
9566


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-GH7 pixel area

Pixel pitch = 2.99 µm

Pixel area = 2.99² = 8.94 µm²

a7CR pixel area

Pixel pitch = 3.73 µm

Pixel area = 3.73² = 13.91 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-GH7 pixel density

Sensor resolution width = 5789 pixels
Sensor width = 1.73 cm

Pixel density = (5789 / 1.73)² / 1000000 = 11.2 MP/cm²

a7CR pixel density

Sensor resolution width = 9566 pixels
Sensor width = 3.57 cm

Pixel density = (9566 / 3.57)² / 1000000 = 7.18 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-GH7 sensor resolution

Sensor width = 17.30 mm
Sensor height = 13.00 mm
Effective megapixels = 25.20
r = 17.30/13.00 = 1.33
X =  25.20 × 1000000  = 4353
1.33
Resolution horizontal: X × r = 4353 × 1.33 = 5789
Resolution vertical: X = 4353

Sensor resolution = 5789 x 4353

a7CR sensor resolution

Sensor width = 35.70 mm
Sensor height = 23.80 mm
Effective megapixels = 61.00
r = 35.70/23.80 = 1.5
X =  61.00 × 1000000  = 6377
1.5
Resolution horizontal: X × r = 6377 × 1.5 = 9566
Resolution vertical: X = 6377

Sensor resolution = 9566 x 6377


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-GH7 crop factor

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

a7CR crop factor

Sensor diagonal in mm = 42.91 mm
Crop factor =   43.27  = 1.01
42.91

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-GH7 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-GH7, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Panasonic Lumix DC-GH7 is 2

a7CR 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 Sony a7CR, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony a7CR is 1.01

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