Sony Cyber-shot DSC-T30 vs. Sony Cyber-shot DSC-TX66

Comparison

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Cyber-shot DSC-T30 image
vs
Cyber-shot DSC-TX66 image
Sony Cyber-shot DSC-T30 Sony Cyber-shot DSC-TX66
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Megapixels
7.20
18.20
Max. image resolution
3072 x 2304
4896 x 3672

Sensor

Sensor type
CCD
CMOS
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/2.3" (~ 6.16 x 4.62 mm)
Sensor resolution
3095 x 2327
4920 x 3699
Diagonal
7.19 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 : 1.15
(ratio)
Sony Cyber-shot DSC-T30 Sony Cyber-shot DSC-TX66
Surface area:
24.84 mm² vs 28.46 mm²
Difference: 3.62 mm² (15%)
TX66 sensor is approx. 1.15x bigger than T30 sensor.
Note: You are comparing sensors of very different generations. There is a gap of 6 years between Sony T30 (2006) and Sony TX66 (2012). Six years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
1.86 µm
1.25 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: 0.61 µm (49%)
Pixel pitch of T30 is approx. 49% higher than pixel pitch of TX66.
Pixel area
3.46 µm²
1.56 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: 1.9 µm² (122%)
A pixel on Sony T30 sensor is approx. 122% bigger than a pixel on Sony TX66.
Pixel density
28.97 MP/cm²
63.79 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: 34.82 µm (120%)
Sony TX66 has approx. 120% higher pixel density than Sony T30.
To learn about the accuracy of these numbers, click here.



Specs

Sony T30
Sony TX66
Crop factor
6.02
5.62
Total megapixels
Effective megapixels
Optical zoom
3x
5x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 64, 100, 200, 400, 800, 1000
Auto, 80, 100, 125, 160, 200, 250, 320, 400, 500, 640, 800, 1000
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
1 cm
1 cm
Focal length (35mm equiv.)
38 - 114 mm
26 - 130 mm
Aperture priority
No
No
Max. aperture
f3.5 - f4.3
f3.5 - f4.8
Max. aperture (35mm equiv.)
f21.1 - f25.9
f19.7 - f27
Metering
Centre weighted, Multi-pattern, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
30 sec
30 sec
Max. shutter speed
1/1000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
6
7
Screen size
3"
3.3"
Screen resolution
230,000 dots
1,229,760 dots
Video capture
Max. video resolution
Storage types
Memory Stick Duo, Memory Stick Pro Duo
Memory Stick Duo/Pro Duo/Pro-HG Duo, microSD/microSDHC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
InfoLithium (NP-FR1)
Lithium-Ion NP-BN battery
Weight
169 g
109 g
Dimensions
95.0 x 56.5 x 23.3 mm
93 x 54 x 13 mm
Year
2006
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

Sony T30 diagonal

The diagonal of T30 sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of that value - 7.19 mm. If you want to know why, see sensor sizes.

w = 5.75 mm
h = 4.32 mm
Diagonal =  5.75² + 4.32²   = 7.19 mm

Sony TX66 diagonal

The diagonal of TX66 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.

T30 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

TX66 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

T30 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 3095 pixels
Pixel pitch =   5.75  × 1000  = 1.86 µm
3095

TX66 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4920 pixels
Pixel pitch =   6.16  × 1000  = 1.25 µm
4920


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

T30 pixel area

Pixel pitch = 1.86 µm

Pixel area = 1.86² = 3.46 µm²

TX66 pixel area

Pixel pitch = 1.25 µm

Pixel area = 1.25² = 1.56 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

T30 pixel density

Sensor resolution width = 3095 pixels
Sensor width = 0.575 cm

Pixel density = (3095 / 0.575)² / 1000000 = 28.97 MP/cm²

TX66 pixel density

Sensor resolution width = 4920 pixels
Sensor width = 0.616 cm

Pixel density = (4920 / 0.616)² / 1000000 = 63.79 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

T30 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 7.20
r = 5.75/4.32 = 1.33
X =  7.20 × 1000000  = 2327
1.33
Resolution horizontal: X × r = 2327 × 1.33 = 3095
Resolution vertical: X = 2327

Sensor resolution = 3095 x 2327

TX66 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 18.20
r = 6.16/4.62 = 1.33
X =  18.20 × 1000000  = 3699
1.33
Resolution horizontal: X × r = 3699 × 1.33 = 4920
Resolution vertical: X = 3699

Sensor resolution = 4920 x 3699


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


T30 crop factor

Sensor diagonal in mm = 7.19 mm
Crop factor =   43.27  = 6.02
7.19

TX66 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).

T30 equivalent aperture

Crop factor = 6.02
Aperture = f3.5 - f4.3

35-mm equivalent aperture = (f3.5 - f4.3) × 6.02 = f21.1 - f25.9

TX66 equivalent aperture

Crop factor = 5.62
Aperture = f3.5 - f4.8

35-mm equivalent aperture = (f3.5 - f4.8) × 5.62 = f19.7 - f27

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