Sigma BF vs. Sony a7C II
Comparison
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| Sigma BF | Sony a7C II | ||||
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Megapixels
24.60
34.10
Max. image resolution
6016 x 4014
7008 x 4672
Sensor
Sensor type
CMOS
CMOS
Sensor size
35.9 x 23.9 mm
35.9 x 23.9 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 »
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 »
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| Sigma BF | Sony a7C II | |
Surface area:
| 858.01 mm² | vs | 858.01 mm² |
Difference: 0 mm² (0%)
BF and a7C II sensors are the same size.
Note: You are comparing cameras of different generations.
There is a 2 year gap between Sigma BF (2025 ) and Sony a7C II (2023 ).
All things being equal, newer sensor generations generally outperform the older.
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.
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 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.
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: 9.73 µm² (39%)
A pixel on Sigma BF sensor is approx. 39% bigger than a pixel on Sony a7C II.
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.
Higher pixel density means smaller pixels and lower pixel density means larger pixels.
To learn about the accuracy of these numbers,
click here.
Specs
Sigma BF
Sony a7C II
Total megapixels
25.30
33.00
Effective megapixels
24.60
34.10
Optical zoom
Digital zoom
Yes
ISO sensitivity
Auto, 100-102400 (extends down to 6)
Auto, 100-51200 (extends to 50-204800)
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Metering
Evaluative, Spot
Evaluative
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
30 sec
30 sec
Max. shutter speed
1/25600 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
None
Electronic
White balance presets
5
7
Screen size
3.2"
3"
Screen resolution
2,100,000 dots
1,036,800 dots
Video capture
Max. video resolution
6016x3384 (30p/25p/24p)
3840x2160 (60/50/30p/25p/24p)
Storage types
Internal only (230GB)
SD/SDHC/SDXC (UHS-II)
USB
USB 3.2 (10 GBit/sec)
USB 3.0 (5 GBit/sec)
HDMI
Wireless
GPS
Battery
BP-81 Lithium-Ion battery
NP-FZ100 lithium-ion battery
Weight
446 g
514 g
Dimensions
130.1 x 72.8 x 36.8 mm
124 x 71.1 x 63.4 mm
Year
2025
2023
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
| Diagonal = √ | w² + h² |
Sigma BF diagonal
w = 35.90 mm
h = 23.90 mm
h = 23.90 mm
| Diagonal = √ | 35.90² + 23.90² | = 43.13 mm |
Sony a7C II diagonal
w = 35.90 mm
h = 23.90 mm
h = 23.90 mm
| Diagonal = √ | 35.90² + 23.90² | = 43.13 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
BF sensor area
Width = 35.90 mm
Height = 23.90 mm
Surface area = 35.90 × 23.90 = 858.01 mm²
Height = 23.90 mm
Surface area = 35.90 × 23.90 = 858.01 mm²
a7C II sensor area
Width = 35.90 mm
Height = 23.90 mm
Surface area = 35.90 × 23.90 = 858.01 mm²
Height = 23.90 mm
Surface area = 35.90 × 23.90 = 858.01 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 |
BF pixel pitch
Sensor width = 35.90 mm
Sensor resolution width = 6075 pixels
Sensor resolution width = 6075 pixels
| Pixel pitch = | 35.90 | × 1000 | = 5.91 µm |
| 6075 |
a7C II pixel pitch
Sensor width = 35.90 mm
Sensor resolution width = 7152 pixels
Sensor resolution width = 7152 pixels
| Pixel pitch = | 35.90 | × 1000 | = 5.02 µm |
| 7152 |
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
| Pixel area = | sensor surface area in mm² |
| effective megapixels |
BF pixel area
Pixel pitch = 5.91 µm
Pixel area = 5.91² = 34.93 µm²
Pixel area = 5.91² = 34.93 µm²
a7C II pixel area
Pixel pitch = 5.02 µm
Pixel area = 5.02² = 25.2 µm²
Pixel area = 5.02² = 25.2 µm²
Pixel density
Pixel density can be calculated with the following formula:
One could also use this 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 |
BF pixel density
Sensor resolution width = 6075 pixels
Sensor width = 3.59 cm
Pixel density = (6075 / 3.59)² / 1000000 = 2.86 MP/cm²
Sensor width = 3.59 cm
Pixel density = (6075 / 3.59)² / 1000000 = 2.86 MP/cm²
a7C II pixel density
Sensor resolution width = 7152 pixels
Sensor width = 3.59 cm
Pixel density = (7152 / 3.59)² / 1000000 = 3.97 MP/cm²
Sensor width = 3.59 cm
Pixel density = (7152 / 3.59)² / 1000000 = 3.97 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:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
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 → |
|
Resolution horizontal: X × r
Resolution vertical: X
BF sensor resolution
Sensor width = 35.90 mm
Sensor height = 23.90 mm
Effective megapixels = 24.60
Resolution horizontal: X × r = 4050 × 1.5 = 6075
Resolution vertical: X = 4050
Sensor resolution = 6075 x 4050
Sensor height = 23.90 mm
Effective megapixels = 24.60
| r = 35.90/23.90 = 1.5 |
|
Resolution vertical: X = 4050
Sensor resolution = 6075 x 4050
a7C II sensor resolution
Sensor width = 35.90 mm
Sensor height = 23.90 mm
Effective megapixels = 34.10
Resolution horizontal: X × r = 4768 × 1.5 = 7152
Resolution vertical: X = 4768
Sensor resolution = 7152 x 4768
Sensor height = 23.90 mm
Effective megapixels = 34.10
| r = 35.90/23.90 = 1.5 |
|
Resolution vertical: X = 4768
Sensor resolution = 7152 x 4768
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 |
BF crop factor
Sensor diagonal in mm = 43.13 mm
| Crop factor = | 43.27 | = 1 |
| 43.13 |
a7C II crop factor
Sensor diagonal in mm = 43.13 mm
| Crop factor = | 43.27 | = 1 |
| 43.13 |
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).
BF 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
Sigma BF, take the aperture of the lens
you're using and multiply it with crop factor.
Since crop factor for Sigma BF is 1, the equivalent aperture is aperture.
Since crop factor for Sigma BF is 1, the equivalent aperture is aperture.
a7C II 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 a7C II, take the aperture of the lens
you're using and multiply it with crop factor.
Since crop factor for Sony a7C II is 1, the equivalent aperture is aperture.
Since crop factor for Sony a7C II is 1, the equivalent aperture is aperture.
Enter your screen size (diagonal)
My screen size is
inches
Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.