Casio Exilim EX-ZS10 vs. Sony Cyber-shot DSC-T7

Comparison

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Exilim EX-ZS10 image
vs
Cyber-shot DSC-T7 image
Casio Exilim EX-ZS10 Sony Cyber-shot DSC-T7
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Megapixels
14.10
5.10
Max. image resolution
4288 x 3216
2592 x 1944

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/2.4" (~ 5.90 x 4.43 mm)
Sensor resolution
4330 x 3256
2604 x 1958
Diagonal
7.70 mm
7.38 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
1.09 : 1
(ratio)
Casio Exilim EX-ZS10 Sony Cyber-shot DSC-T7
Surface area:
28.46 mm² vs 26.14 mm²
Difference: 2.32 mm² (9%)
ZS10 sensor is approx. 1.09x bigger than T7 sensor.
Note: You are comparing sensors of very different generations. There is a gap of 6 years between Casio ZS10 (2011) and Sony T7 (2005). 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
1.42 µm
2.27 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: 0.85 µm (60%)
Pixel pitch of T7 is approx. 60% higher than pixel pitch of ZS10.
Pixel area
2.02 µm²
5.15 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: 3.13 µm² (155%)
A pixel on Sony T7 sensor is approx. 155% bigger than a pixel on Casio ZS10.
Pixel density
49.41 MP/cm²
19.48 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: 29.93 µm (154%)
Casio ZS10 has approx. 154% higher pixel density than Sony T7.
To learn about the accuracy of these numbers, click here.



Specs

Casio ZS10
Sony T7
Crop factor
5.62
5.86
Total megapixels
Effective megapixels
14.10
Optical zoom
12.5x
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto
Auto, 100, 200, 400
RAW
Manual focus
Normal focus range
50 cm
50 cm
Macro focus range
1 cm
1 cm
Focal length (35mm equiv.)
24 - 300 mm
38 - 114 mm
Aperture priority
No
No
Max. aperture
f3.2 - f6.5
f3.5 - f4.4
Max. aperture (35mm equiv.)
f18 - f36.5
f20.5 - f25.8
Metering
Centre weighted, Multi-segment, Spot
Centre weighted
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
15 sec
1 sec
Max. shutter speed
1/2000 sec
1/1000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
7
6
Screen size
2.7"
2.5"
Screen resolution
230,000 dots
230,000 dots
Video capture
Max. video resolution
Storage types
SDHC, Secure Digital
Memory Stick Duo, Memory Stick Pro Duo
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Rechargeable lithium ion battery
InfoLithium (NP-FE1)
Weight
204 g
115 g
Dimensions
103 x 59 x 20 mm
92 x 60 x 15 mm
Year
2011
2005




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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

Casio ZS10 diagonal

The diagonal of ZS10 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 T7 diagonal

The diagonal of T7 sensor is not 1/2.4 or 0.42" (10.6 mm) as you might expect, but approximately two thirds of that value - 7.38 mm. If you want to know why, see sensor sizes.

w = 5.90 mm
h = 4.43 mm
Diagonal = √  5.90² + 4.43²   = 7.38 mm


Surface area

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

ZS10 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

T7 sensor area

Width = 5.90 mm
Height = 4.43 mm

Surface area = 5.90 × 4.43 = 26.14 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

ZS10 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4330 pixels
Pixel pitch =   6.16  × 1000  = 1.42 µm
4330

T7 pixel pitch

Sensor width = 5.90 mm
Sensor resolution width = 2604 pixels
Pixel pitch =   5.90  × 1000  = 2.27 µm
2604


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

ZS10 pixel area

Pixel pitch = 1.42 µm

Pixel area = 1.42² = 2.02 µm²

T7 pixel area

Pixel pitch = 2.27 µm

Pixel area = 2.27² = 5.15 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

ZS10 pixel density

Sensor resolution width = 4330 pixels
Sensor width = 0.616 cm

Pixel density = (4330 / 0.616)² / 1000000 = 49.41 MP/cm²

T7 pixel density

Sensor resolution width = 2604 pixels
Sensor width = 0.59 cm

Pixel density = (2604 / 0.59)² / 1000000 = 19.48 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

ZS10 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 14.10
r = 6.16/4.62 = 1.33
X = √  14.10 × 1000000  = 3256
1.33
Resolution horizontal: X × r = 3256 × 1.33 = 4330
Resolution vertical: X = 3256

Sensor resolution = 4330 x 3256

T7 sensor resolution

Sensor width = 5.90 mm
Sensor height = 4.43 mm
Effective megapixels = 5.10
r = 5.90/4.43 = 1.33
X = √  5.10 × 1000000  = 1958
1.33
Resolution horizontal: X × r = 1958 × 1.33 = 2604
Resolution vertical: X = 1958

Sensor resolution = 2604 x 1958


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


ZS10 crop factor

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

T7 crop factor

Sensor diagonal in mm = 7.38 mm
Crop factor =   43.27  = 5.86
7.38

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).

ZS10 equivalent aperture

Crop factor = 5.62
Aperture = f3.2 - f6.5

35-mm equivalent aperture = (f3.2 - f6.5) × 5.62 = f18 - f36.5

T7 equivalent aperture

Crop factor = 5.86
Aperture = f3.5 - f4.4

35-mm equivalent aperture = (f3.5 - f4.4) × 5.86 = f20.5 - f25.8

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