Praktica Luxmedia 12-23 vs. Samsung Digimax 301

Comparison

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Luxmedia 12-23 image
vs
Digimax 301 image
Praktica Luxmedia 12-23 Samsung Digimax 301
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Megapixels
12.00
3.10
Max. image resolution
4000 x 3000
2048 x 1536

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/2.7" (~ 5.33 x 4 mm)
Sensor resolution
3995 x 3004
2031 x 1527
Diagonal
7.70 mm
6.66 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
1.33 : 1
(ratio)
Praktica Luxmedia 12-23 Samsung Digimax 301
Surface area:
28.46 mm² vs 21.32 mm²
Difference: 7.14 mm² (33%)
Luxmedia 12-23 sensor is approx. 1.33x bigger than 301 sensor.
Note: You are comparing sensors of very different generations. There is a gap of 6 years between Praktica Luxmedia 12-23 (2010) and Samsung 301 (2004). 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
1.54 µm
2.62 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: 1.08 µm (70%)
Pixel pitch of 301 is approx. 70% higher than pixel pitch of Luxmedia 12-23.
Pixel area
2.37 µm²
6.86 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: 4.49 µm² (189%)
A pixel on Samsung 301 sensor is approx. 189% bigger than a pixel on Praktica Luxmedia 12-23.
Pixel density
42.06 MP/cm²
14.52 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: 27.54 µm (190%)
Praktica Luxmedia 12-23 has approx. 190% higher pixel density than Samsung 301.
To learn about the accuracy of these numbers, click here.



Specs

Praktica Luxmedia 12-23
Samsung 301
Crop factor
5.62
6.5
Total megapixels
3.30
Effective megapixels
3.10
Optical zoom
Yes
0.9x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400, 800, 1600, 3200
Auto, (100-400)
RAW
Manual focus
Normal focus range
40 cm
100 cm
Macro focus range
5 cm
19 cm
Focal length (35mm equiv.)
35 - 105 mm
35 - 33 mm
Aperture priority
No
No
Max. aperture
f3.0 - f5.6
f3.9
Max. aperture (35mm equiv.)
f16.9 - f31.5
f25.4
Metering
Centre weighted, Matrix, Spot
Multi Spot, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/2 EV steps)
Shutter priority
No
No
Min. shutter speed
2 sec
5 sec
Max. shutter speed
1/2000 sec
1/1000 sec
Built-in flash
External flash
Viewfinder
None
Optical (tunnel)
White balance presets
5
7
Screen size
2.7"
1.6"
Screen resolution
117,600 dots
Video capture
Max. video resolution
Storage types
SDHC, Secure Digital
MultiMedia, Secure Digital
USB
USB 1.0
HDMI
Wireless
GPS
Battery
Li-Ion
AA (2) batteries (NiMH recommended)
Weight
130 g
140 g
Dimensions
95 x 60 x 18.4 mm
98 x 51 x 37.3 mm
Year
2010
2004




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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

Praktica Luxmedia 12-23 diagonal

The diagonal of Luxmedia 12-23 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

Samsung 301 diagonal

The diagonal of 301 sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of that value - 6.66 mm. If you want to know why, see sensor sizes.

w = 5.33 mm
h = 4.00 mm
Diagonal = √  5.33² + 4.00²   = 6.66 mm


Surface area

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

Luxmedia 12-23 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

301 sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 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

Luxmedia 12-23 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 3995 pixels
Pixel pitch =   6.16  × 1000  = 1.54 µm
3995

301 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 2031 pixels
Pixel pitch =   5.33  × 1000  = 2.62 µm
2031


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

Luxmedia 12-23 pixel area

Pixel pitch = 1.54 µm

Pixel area = 1.54² = 2.37 µm²

301 pixel area

Pixel pitch = 2.62 µm

Pixel area = 2.62² = 6.86 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

Luxmedia 12-23 pixel density

Sensor resolution width = 3995 pixels
Sensor width = 0.616 cm

Pixel density = (3995 / 0.616)² / 1000000 = 42.06 MP/cm²

301 pixel density

Sensor resolution width = 2031 pixels
Sensor width = 0.533 cm

Pixel density = (2031 / 0.533)² / 1000000 = 14.52 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

Luxmedia 12-23 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 12.00
r = 6.16/4.62 = 1.33
X = √  12.00 × 1000000  = 3004
1.33
Resolution horizontal: X × r = 3004 × 1.33 = 3995
Resolution vertical: X = 3004

Sensor resolution = 3995 x 3004

301 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 3.10
r = 5.33/4.00 = 1.33
X = √  3.10 × 1000000  = 1527
1.33
Resolution horizontal: X × r = 1527 × 1.33 = 2031
Resolution vertical: X = 1527

Sensor resolution = 2031 x 1527


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


Luxmedia 12-23 crop factor

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

301 crop factor

Sensor diagonal in mm = 6.66 mm
Crop factor =   43.27  = 6.5
6.66

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).

Luxmedia 12-23 equivalent aperture

Crop factor = 5.62
Aperture = f3.0 - f5.6

35-mm equivalent aperture = (f3.0 - f5.6) × 5.62 = f16.9 - f31.5

301 equivalent aperture

Crop factor = 6.5
Aperture = f3.9

35-mm equivalent aperture = (f3.9) × 6.5 = f25.4

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