Sony a7C vs. Olympus C-120
Comparison
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Sony a7C | Olympus C-120 | ||||
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Megapixels
24.20
2.11
Max. image resolution
6000 x 4000
1600 x 1200
Sensor
Sensor type
CMOS
CCD
Sensor size
35.6 x 23.8 mm
1/3.2" (~ 4.5 x 3.37 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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55.85 | : | 1 |
(ratio) | ||
Sony a7C | Olympus C-120 |
Surface area:
847.28 mm² | vs | 15.17 mm² |
Difference: 832.11 mm² (5485%)
a7C sensor is approx. 55.85x bigger than C-120 sensor.
Note: You are comparing sensors of vastly different generations.
There is a gap of 18 years between Sony a7C (2020) and
Olympus C-120 (2002).
Eighteen years is a huge amount of time,
technology wise, resulting in newer sensor being much more
efficient than the older one.
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: 27.75 µm² (386%)
A pixel on Sony a7C sensor is approx. 386% bigger than a pixel on Olympus C-120.
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
Sony a7C
Olympus C-120
Total megapixels
25.30
Effective megapixels
24.20
Optical zoom
No
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100-51200 (extends to 50-204800)
Auto, (100-400)
RAW
Manual focus
Normal focus range
60 cm
Macro focus range
25 cm
Focal length (35mm equiv.)
35 mm
Aperture priority
Yes
No
Max. aperture
f4
Metering
Multi, Center-weighted, Highlight-weighted, Average, Spot
ESP Digital, Spot
Exposure compensation
±5 EV (in 1/3 EV, 1/2 EV steps)
±2 EV (in 1/2 EV steps)
Shutter priority
Yes
No
Min. shutter speed
30 sec
1/2 sec
Max. shutter speed
1/4000 sec
1/1000 sec
Built-in flash
External flash
Viewfinder
Electronic
Optical
White balance presets
7
6
Screen size
3"
1.6"
Screen resolution
921,600 dots
61,000 dots
Video capture
Max. video resolution
3840x2160 (30p/25p/24p)
Storage types
SD/SDHC/SDXC/MS Pro Duo
SmartMedia
USB
USB 3.0 (5 GBit/sec)
USB 1.1
HDMI
Wireless
GPS
Battery
NP-FZ100 lithium-ion battery
2x CR-V3, 4x AA
Weight
509 g
302 g
Dimensions
124 x 71.1 x 59.7 mm
123 x 65 x 45 mm
Year
2020
2002
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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 |
Sony a7C diagonal
w = 35.60 mm
h = 23.80 mm
h = 23.80 mm
Diagonal = √ | 35.60² + 23.80² | = 42.82 mm |
Olympus C-120 diagonal
The diagonal of C-120 sensor is not 1/3.2 or 0.31" (7.9 mm) as you might expect, but approximately two thirds of
that value - 5.62 mm. If you want to know why, see
sensor sizes.
w = 4.50 mm
h = 3.37 mm
w = 4.50 mm
h = 3.37 mm
Diagonal = √ | 4.50² + 3.37² | = 5.62 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
a7C sensor area
Width = 35.60 mm
Height = 23.80 mm
Surface area = 35.60 × 23.80 = 847.28 mm²
Height = 23.80 mm
Surface area = 35.60 × 23.80 = 847.28 mm²
C-120 sensor area
Width = 4.50 mm
Height = 3.37 mm
Surface area = 4.50 × 3.37 = 15.17 mm²
Height = 3.37 mm
Surface area = 4.50 × 3.37 = 15.17 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 |
a7C pixel pitch
Sensor width = 35.60 mm
Sensor resolution width = 6026 pixels
Sensor resolution width = 6026 pixels
Pixel pitch = | 35.60 | × 1000 | = 5.91 µm |
6026 |
C-120 pixel pitch
Sensor width = 4.50 mm
Sensor resolution width = 1682 pixels
Sensor resolution width = 1682 pixels
Pixel pitch = | 4.50 | × 1000 | = 2.68 µm |
1682 |
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 |
a7C pixel area
Pixel pitch = 5.91 µm
Pixel area = 5.91² = 34.93 µm²
Pixel area = 5.91² = 34.93 µm²
C-120 pixel area
Pixel pitch = 2.68 µm
Pixel area = 2.68² = 7.18 µm²
Pixel area = 2.68² = 7.18 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 |
a7C pixel density
Sensor resolution width = 6026 pixels
Sensor width = 3.56 cm
Pixel density = (6026 / 3.56)² / 1000000 = 2.87 MP/cm²
Sensor width = 3.56 cm
Pixel density = (6026 / 3.56)² / 1000000 = 2.87 MP/cm²
C-120 pixel density
Sensor resolution width = 1682 pixels
Sensor width = 0.45 cm
Pixel density = (1682 / 0.45)² / 1000000 = 13.97 MP/cm²
Sensor width = 0.45 cm
Pixel density = (1682 / 0.45)² / 1000000 = 13.97 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 → |
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Resolution horizontal: X × r
Resolution vertical: X
a7C sensor resolution
Sensor width = 35.60 mm
Sensor height = 23.80 mm
Effective megapixels = 24.20
Resolution horizontal: X × r = 4017 × 1.5 = 6026
Resolution vertical: X = 4017
Sensor resolution = 6026 x 4017
Sensor height = 23.80 mm
Effective megapixels = 24.20
r = 35.60/23.80 = 1.5 |
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Resolution vertical: X = 4017
Sensor resolution = 6026 x 4017
C-120 sensor resolution
Sensor width = 4.50 mm
Sensor height = 3.37 mm
Effective megapixels = 2.11
Resolution horizontal: X × r = 1255 × 1.34 = 1682
Resolution vertical: X = 1255
Sensor resolution = 1682 x 1255
Sensor height = 3.37 mm
Effective megapixels = 2.11
r = 4.50/3.37 = 1.34 |
|
Resolution vertical: X = 1255
Sensor resolution = 1682 x 1255
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 |
a7C crop factor
Sensor diagonal in mm = 42.82 mm
Crop factor = | 43.27 | = 1.01 |
42.82 |
C-120 crop factor
Sensor diagonal in mm = 5.62 mm
Crop factor = | 43.27 | = 7.7 |
5.62 |
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).
a7C 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, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Sony a7C is 1.01
Crop factor for Sony a7C is 1.01
C-120 equivalent aperture
Crop factor = 7.7
Aperture = f4
35-mm equivalent aperture = (f4) × 7.7 = f30.8
Aperture = f4
35-mm equivalent aperture = (f4) × 7.7 = f30.8
More comparisons of Sony a7C:
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