Sony a7S III vs. Sony Alpha SLT-A58

Comparison

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a7S III image
vs
Alpha SLT-A58 image
Sony a7S III Sony Alpha SLT-A58
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Megapixels
12.10
20.10
Max. image resolution
4240 x 2832
5456 x 3632

Sensor

Sensor type
CMOS
CMOS
Sensor size
35.6 x 23.8 mm
23.2 x 15.4 mm
Sensor resolution
4260 x 2840
5508 x 3648
Diagonal
42.82 mm
27.85 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
2.37 : 1
(ratio)
Sony a7S III Sony Alpha SLT-A58
Surface area:
847.28 mm² vs 357.28 mm²
Difference: 490 mm² (137%)
a7S III sensor is approx. 2.37x bigger than Alpha SLT-A58 sensor.
Note: You are comparing sensors of very different generations. There is a gap of 7 years between Sony a7S III (2020) and Sony Alpha SLT-A58 (2013). 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
8.36 µm
4.21 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: 4.15 µm (99%)
Pixel pitch of a7S III is approx. 99% higher than pixel pitch of Alpha SLT-A58.
Pixel area
69.89 µm²
17.72 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: 52.17 µm² (294%)
A pixel on Sony a7S III sensor is approx. 294% bigger than a pixel on Sony Alpha SLT-A58.
Pixel density
1.43 MP/cm²
5.64 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: 4.21 µm (294%)
Sony Alpha SLT-A58 has approx. 294% higher pixel density than Sony a7S III.
To learn about the accuracy of these numbers, click here.



Specs

Sony a7S III
Sony Alpha SLT-A58
Crop factor
1.01
1.55
Total megapixels
12.90
20.40
Effective megapixels
12.10
20.10
Optical zoom
 
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80-102400 (extends to 40-409600)
Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800, 16000 (25600 with boost)
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, Spot
Multi, Center-weighted, Spot
Exposure compensation
±5 EV (in 1/3 EV, 1/2 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
30 sec
30 sec
Max. shutter speed
1/8000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Electronic
Electronic
White balance presets
10
9
Screen size
3"
2.7"
Screen resolution
1,440,000 dots
460,800 dots
Video capture
Max. video resolution
4264x2408 (60p)
1920x1080 (60i/24p)
Storage types
SD/SDHC/SDXC/MS Pro Duo/CFexpress
SD/SDHC/SDXC, Memory Stick Pro Duo/Pro-HG Duo/XC-HG Duo
USB
USB 3.0 (5 GBit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
NP-FZ100 lithium-ion battery
Rechargeable NP-FM500H battery
Weight
614 g
573 g
Dimensions
128.9 x 96.9 x 69.7 mm
128.6 x 95.5 x 77.7 mm
Year
2020
2013




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Diagonal

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

Sony a7S III diagonal

w = 35.60 mm
h = 23.80 mm
Diagonal =  35.60² + 23.80²   = 42.82 mm

Sony Alpha SLT-A58 diagonal

w = 23.20 mm
h = 15.40 mm
Diagonal =  23.20² + 15.40²   = 27.85 mm


Surface area

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

a7S III sensor area

Width = 35.60 mm
Height = 23.80 mm

Surface area = 35.60 × 23.80 = 847.28 mm²

Alpha SLT-A58 sensor area

Width = 23.20 mm
Height = 15.40 mm

Surface area = 23.20 × 15.40 = 357.28 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

a7S III pixel pitch

Sensor width = 35.60 mm
Sensor resolution width = 4260 pixels
Pixel pitch =   35.60  × 1000  = 8.36 µm
4260

Alpha SLT-A58 pixel pitch

Sensor width = 23.20 mm
Sensor resolution width = 5508 pixels
Pixel pitch =   23.20  × 1000  = 4.21 µm
5508


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

a7S III pixel area

Pixel pitch = 8.36 µm

Pixel area = 8.36² = 69.89 µm²

Alpha SLT-A58 pixel area

Pixel pitch = 4.21 µm

Pixel area = 4.21² = 17.72 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

a7S III pixel density

Sensor resolution width = 4260 pixels
Sensor width = 3.56 cm

Pixel density = (4260 / 3.56)² / 1000000 = 1.43 MP/cm²

Alpha SLT-A58 pixel density

Sensor resolution width = 5508 pixels
Sensor width = 2.32 cm

Pixel density = (5508 / 2.32)² / 1000000 = 5.64 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

a7S III sensor resolution

Sensor width = 35.60 mm
Sensor height = 23.80 mm
Effective megapixels = 12.10
r = 35.60/23.80 = 1.5
X =  12.10 × 1000000  = 2840
1.5
Resolution horizontal: X × r = 2840 × 1.5 = 4260
Resolution vertical: X = 2840

Sensor resolution = 4260 x 2840

Alpha SLT-A58 sensor resolution

Sensor width = 23.20 mm
Sensor height = 15.40 mm
Effective megapixels = 20.10
r = 23.20/15.40 = 1.51
X =  20.10 × 1000000  = 3648
1.51
Resolution horizontal: X × r = 3648 × 1.51 = 5508
Resolution vertical: X = 3648

Sensor resolution = 5508 x 3648


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


a7S III crop factor

Sensor diagonal in mm = 42.82 mm
Crop factor =   43.27  = 1.01
42.82

Alpha SLT-A58 crop factor

Sensor diagonal in mm = 27.85 mm
Crop factor =   43.27  = 1.55
27.85

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).

a7S 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 Sony a7S III, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony a7S III is 1.01

Alpha SLT-A58 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 Alpha SLT-A58, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony Alpha SLT-A58 is 1.55

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