Sony Alpha SLT-A58

Specs

Brand: Sony
Model: Alpha SLT-A58
Megapixels: 20.10
Sensor: 23.2 x 15.4 mm
Price: check here »

Sensor info

Sony Alpha SLT-A58 comes with a 23.2 x 15.4 mm CMOS sensor, which has a diagonal of 27.85 mm (1.1") and a surface area of 357.28 mm².
Diagonal
27.85 mm
Surface area
357.3 mm²
Pixel pitch
4.21 µm
Pixel area
17.72 µm²
Pixel density
5.64 MP/cm²
If you want to know about the accuracy of these numbers, click here.

Actual sensor size

Note: Actual size is set to screen → change »
This is the actual size of the Alpha SLT-A58 sensor: 23.2 x 15.4 mm
The sensor has a surface area of 357.3 mm². There are approx. 20,100,000 photosites (pixels) on this area. Pixel pitch, which is a measure of the distance between pixels, is 4.21 µm. Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next.

Pixel or photosite area is 17.72 µm². The larger the photosite, the more light it can capture and the more information can be recorded.

Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor. Sony Alpha SLT-A58 has a pixel density of 5.64 MP/cm².

These numbers are important in terms of assessing the overall quality of a digital camera. Generally, the bigger (and newer) the sensor, pixel pitch and photosite area, and the smaller the pixel density, the better the camera. If you want to see how Alpha SLT-A58 compares to other cameras, click here.

Specifications

Brand: Sony
Model: Alpha SLT-A58
Effective megapixels: 20.10
Total megapixels: 20.40
Sensor size: 23.2 x 15.4 mm
Sensor type: CMOS
Sensor resolution: 5508 x 3648
Max. image resolution: 5456 x 3632
Crop factor: 1.55
Optical zoom:
Digital zoom: Yes
ISO: Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800, 16000 (25600 with boost)
RAW support:
Manual focus:
Normal focus range:
Macro focus range:
Focal length (35mm equiv.):
Aperture priority: Yes
Max aperture:
Max. aperture (35mm equiv.): n/a
Depth of field: simulate →
Metering: Multi, Center-weighted, Spot
Exposure Compensation: ±3 EV (in 1/3 EV steps)
Shutter priority: Yes
Min. shutter speed: 30 sec
Max. shutter speed: 1/4000 sec
Built-in flash:
External flash:
Viewfinder: Electronic
White balance presets: 9
Screen size: 2.7"
Screen resolution: 460,800 dots
Video capture:
Max. video resolution: 1920x1080 (60i/24p)
Storage types: SD/SDHC/SDXC, Memory Stick Pro Duo/Pro-HG Duo/XC-HG Duo
USB: USB 2.0 (480 Mbit/sec)
HDMI:
Wireless:
GPS:
Battery: Rechargeable NP-FM500H battery
Weight: 573 g
Dimensions: 128.6 x 95.5 x 77.7 mm
Year: 2013

Compare Alpha SLT-A58 with another camera

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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 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.

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

Sony 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

Sony 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

You could also use this formula:
Pixel density =   effective megapixels × 1000000  / 10000
sensor surface area in mm²

Sony 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

Sony 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


Sony Alpha SLT-A58 crop factor:

Sensor diagonal = 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).

Sony 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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