Samsung ST65 vs. Sony Cyber-shot DSC-HX30V

Comparison

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ST65 image
vs
Cyber-shot DSC-HX30V image
Samsung ST65 Sony Cyber-shot DSC-HX30V
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Megapixels
14.20
18.90
Max. image resolution
4608 x 3456
4896 x 3672

Sensor

Sensor type
CCD
CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/2.3" (~ 6.16 x 4.62 mm)
Sensor resolution
4346 x 3268
5014 x 3770
Diagonal
7.70 mm
7.70 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 : 1
(ratio)
Samsung ST65 Sony Cyber-shot DSC-HX30V
Surface area:
28.46 mm² vs 28.46 mm²
Difference: 0 mm² (0%)
ST65 and HX30V sensors are the same size.
Pixel pitch
1.42 µm
1.23 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: 0.19 µm (15%)
Pixel pitch of ST65 is approx. 15% higher than pixel pitch of HX30V.
Pixel area
2.02 µm²
1.51 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: 0.51 µm² (34%)
A pixel on Samsung ST65 sensor is approx. 34% bigger than a pixel on Sony HX30V.
Pixel density
49.78 MP/cm²
66.25 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: 16.47 µm (33%)
Sony HX30V has approx. 33% higher pixel density than Samsung ST65.
To learn about the accuracy of these numbers, click here.



Specs

Samsung ST65
Sony HX30V
Crop factor
5.62
5.62
Total megapixels
Effective megapixels
14.20
Optical zoom
5x
20x
Digital zoom
Yes
Yes
ISO sensitivity
Auto
Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800
RAW
Manual focus
Normal focus range
80 cm
35 cm
Macro focus range
5 cm
1 cm
Focal length (35mm equiv.)
26 - 130 mm
25 - 500 mm
Aperture priority
No
No
Max. aperture
f3.3 - f5.9
f3.2 - f5.8
Max. aperture (35mm equiv.)
f18.5 - f33.2
f18 - f32.6
Metering
Multi, Center-weighted, Spot
Centre weighted, Multi-segment, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
8 sec
30 sec
Max. shutter speed
1/2000 sec
1/1600 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
5
7
Screen size
3"
3"
Screen resolution
460,000 dots
921,600 dots
Video capture
Max. video resolution
Storage types
SDHC, Secure Digital
SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion BP70 rechargeable battery
Lithium-Ion NP-BG1 battery
Weight
121 g
254 g
Dimensions
92 x 56 x 17 mm
107 x 62 x 35 mm
Year
2011
2012




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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

Samsung ST65 diagonal

The diagonal of ST65 sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal = √  6.16² + 4.62²   = 7.70 mm

Sony HX30V diagonal

The diagonal of HX30V sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal = √  6.16² + 4.62²   = 7.70 mm


Surface area

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

ST65 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

HX30V sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 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

ST65 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4346 pixels
Pixel pitch =   6.16  × 1000  = 1.42 µm
4346

HX30V pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 5014 pixels
Pixel pitch =   6.16  × 1000  = 1.23 µm
5014


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

ST65 pixel area

Pixel pitch = 1.42 µm

Pixel area = 1.42² = 2.02 µm²

HX30V pixel area

Pixel pitch = 1.23 µm

Pixel area = 1.23² = 1.51 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

ST65 pixel density

Sensor resolution width = 4346 pixels
Sensor width = 0.616 cm

Pixel density = (4346 / 0.616)² / 1000000 = 49.78 MP/cm²

HX30V pixel density

Sensor resolution width = 5014 pixels
Sensor width = 0.616 cm

Pixel density = (5014 / 0.616)² / 1000000 = 66.25 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

ST65 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 14.20
r = 6.16/4.62 = 1.33
X = √  14.20 × 1000000  = 3268
1.33
Resolution horizontal: X × r = 3268 × 1.33 = 4346
Resolution vertical: X = 3268

Sensor resolution = 4346 x 3268

HX30V sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 18.90
r = 6.16/4.62 = 1.33
X = √  18.90 × 1000000  = 3770
1.33
Resolution horizontal: X × r = 3770 × 1.33 = 5014
Resolution vertical: X = 3770

Sensor resolution = 5014 x 3770


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


ST65 crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

HX30V crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

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).

ST65 equivalent aperture

Crop factor = 5.62
Aperture = f3.3 - f5.9

35-mm equivalent aperture = (f3.3 - f5.9) × 5.62 = f18.5 - f33.2

HX30V equivalent aperture

Crop factor = 5.62
Aperture = f3.2 - f5.8

35-mm equivalent aperture = (f3.2 - f5.8) × 5.62 = f18 - f32.6

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