Samsung Digimax U-CA5 vs. Sony Cyber-shot DSC-P92

Comparison

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Digimax U-CA5 image
vs
Cyber-shot DSC-P92 image
Samsung Digimax U-CA5 Sony Cyber-shot DSC-P92
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Megapixels
5.00
5.20
Max. image resolution
2592 x 1944
2592 x 1944

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/1.8" (~ 7.11 x 5.33 mm)
Sensor resolution
2579 x 1939
2629 x 1977
Diagonal
7.19 mm
8.89 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 : 1.53
(ratio)
Samsung Digimax U-CA5 Sony Cyber-shot DSC-P92
Surface area:
24.84 mm² vs 37.90 mm²
Difference: 13.06 mm² (53%)
P92 sensor is approx. 1.53x bigger than U-CA5 sensor.
Note: You are comparing cameras of different generations. There is a 2 year gap between Samsung U-CA5 (2005) and Sony P92 (2003). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
2.23 µm
2.7 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: 0.47 µm (21%)
Pixel pitch of P92 is approx. 21% higher than pixel pitch of U-CA5.
Pixel area
4.97 µm²
7.29 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: 2.32 µm² (47%)
A pixel on Sony P92 sensor is approx. 47% bigger than a pixel on Samsung U-CA5.
Pixel density
20.12 MP/cm²
13.67 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: 6.45 µm (47%)
Samsung U-CA5 has approx. 47% higher pixel density than Sony P92.
To learn about the accuracy of these numbers, click here.



Specs

Samsung U-CA5
Sony P92
Crop factor
6.02
4.87
Total megapixels
Effective megapixels
Optical zoom
Yes
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 300, 400
Auto, 100, 200, 400
RAW
Manual focus
Normal focus range
80 cm
50 cm
Macro focus range
5 cm
10 cm
Focal length (35mm equiv.)
35 - 105 mm
38 - 114 mm
Aperture priority
No
No
Max. aperture
f2.9 - f4.8
f2.8 - f5.6
Max. aperture (35mm equiv.)
f17.5 - f28.9
f13.6 - f27.3
Metering
Multi Spot, Spot
Matrix, Multi-segment, Spot
Exposure compensation
±2 EV (in 1/2 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
15 sec
2 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Optical
Optical (tunnel)
White balance presets
5
6
Screen size
1.8"
1.5"
Screen resolution
117,600 dots
123,000 dots
Video capture
Max. video resolution
Storage types
Secure Digital
Memory Stick, Memory Stick Pro
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Li-Ion
AA (2) batteries (NiMH rechargables included)
Weight
259 g
Dimensions
119 x 58 x 33 mm
Year
2005
2003




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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 U-CA5 diagonal

The diagonal of U-CA5 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 P92 diagonal

The diagonal of P92 sensor is not 1/1.8 or 0.56" (14.1 mm) as you might expect, but approximately two thirds of that value - 8.89 mm. If you want to know why, see sensor sizes.

w = 7.11 mm
h = 5.33 mm
Diagonal = √  7.11² + 5.33²   = 8.89 mm


Surface area

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

U-CA5 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

P92 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 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

U-CA5 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2579 pixels
Pixel pitch =   5.75  × 1000  = 2.23 µm
2579

P92 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2629 pixels
Pixel pitch =   7.11  × 1000  = 2.7 µm
2629


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

U-CA5 pixel area

Pixel pitch = 2.23 µm

Pixel area = 2.23² = 4.97 µm²

P92 pixel area

Pixel pitch = 2.7 µm

Pixel area = 2.7² = 7.29 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

U-CA5 pixel density

Sensor resolution width = 2579 pixels
Sensor width = 0.575 cm

Pixel density = (2579 / 0.575)² / 1000000 = 20.12 MP/cm²

P92 pixel density

Sensor resolution width = 2629 pixels
Sensor width = 0.711 cm

Pixel density = (2629 / 0.711)² / 1000000 = 13.67 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

U-CA5 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 5.00
r = 5.75/4.32 = 1.33
X = √  5.00 × 1000000  = 1939
1.33
Resolution horizontal: X × r = 1939 × 1.33 = 2579
Resolution vertical: X = 1939

Sensor resolution = 2579 x 1939

P92 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 5.20
r = 7.11/5.33 = 1.33
X = √  5.20 × 1000000  = 1977
1.33
Resolution horizontal: X × r = 1977 × 1.33 = 2629
Resolution vertical: X = 1977

Sensor resolution = 2629 x 1977


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


U-CA5 crop factor

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

P92 crop factor

Sensor diagonal in mm = 8.89 mm
Crop factor =   43.27  = 4.87
8.89

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).

U-CA5 equivalent aperture

Crop factor = 6.02
Aperture = f2.9 - f4.8

35-mm equivalent aperture = (f2.9 - f4.8) × 6.02 = f17.5 - f28.9

P92 equivalent aperture

Crop factor = 4.87
Aperture = f2.8 - f5.6

35-mm equivalent aperture = (f2.8 - f5.6) × 4.87 = f13.6 - f27.3

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