Praktica Digi 30 vs. Jenoptik JD 4100 zoom
Comparison
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| Praktica Digi 30 | Jenoptik JD 4100 zoom | ||||
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Megapixels
3.20
4.13
Max. image resolution
2048 x 1536
2272 x 1704
Sensor
Sensor type
CMOS
CCD
Sensor size
1/2" (~ 6.4 x 4.8 mm)
1/1.8" (~ 7.11 x 5.33 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 »
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 »
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| Praktica Digi 30 | Jenoptik JD 4100 zoom | |
Surface area:
| 30.72 mm² | vs | 37.90 mm² |
Difference: 7.18 mm² (23%)
JD 4100 zoom sensor is approx. 1.23x bigger than Digi 30 sensor.
Note: You are comparing cameras of different generations.
There is a 2 year gap between Praktica Digi 30 (2006) and Jenoptik JD 4100 zoom (2004).
All things being equal, newer sensor generations generally outperform the older.
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.
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.
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.
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: 0.43 µm² (5%)
A pixel on Praktica Digi 30 sensor is approx. 5% bigger than a pixel on Jenoptik JD 4100 zoom.
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.
Higher pixel density means smaller pixels and lower pixel density means larger pixels.
To learn about the accuracy of these numbers,
click here.
Specs
Praktica Digi 30
Jenoptik JD 4100 zoom
Total megapixels
Effective megapixels
Optical zoom
No
Yes
Digital zoom
Yes
Yes
ISO sensitivity
100
Auto, 100, 200, 400
RAW
Manual focus
Normal focus range
150 cm
40 cm
Macro focus range
50 cm
10 cm
Focal length (35mm equiv.)
40 mm
37 - 111 mm
Aperture priority
No
No
Max. aperture
f2.8
f2.7 - f4.9
Metering
Centre weighted
Centre weighted, Matrix
Exposure compensation
±2 EV (in 1/2 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
1 sec
8 sec
Max. shutter speed
1/1000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Optical
Optical
White balance presets
5
6
Screen size
1.5"
1.5"
Screen resolution
Video capture
Max. video resolution
Storage types
Secure Digital
Secure Digital
USB
USB 1.1
USB 1.1
HDMI
Wireless
GPS
Battery
2x AAA
2x AA
Weight
160 g
Dimensions
90 x 57 x 26 mm
107 x 60 x 36 mm
Year
2006
2004
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
| Diagonal = √ | w² + h² |
Praktica Digi 30 diagonal
The diagonal of Digi 30 sensor is not 1/2 or 0.5" (12.7 mm) as you might expect, but approximately two thirds of
that value - 8 mm. If you want to know why, see
sensor sizes.
w = 6.40 mm
h = 4.80 mm
w = 6.40 mm
h = 4.80 mm
| Diagonal = √ | 6.40² + 4.80² | = 8.00 mm |
Jenoptik JD 4100 zoom diagonal
The diagonal of JD 4100 zoom 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
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.
Digi 30 sensor area
Width = 6.40 mm
Height = 4.80 mm
Surface area = 6.40 × 4.80 = 30.72 mm²
Height = 4.80 mm
Surface area = 6.40 × 4.80 = 30.72 mm²
JD 4100 zoom sensor area
Width = 7.11 mm
Height = 5.33 mm
Surface area = 7.11 × 5.33 = 37.90 mm²
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 |
Digi 30 pixel pitch
Sensor width = 6.40 mm
Sensor resolution width = 2063 pixels
Sensor resolution width = 2063 pixels
| Pixel pitch = | 6.40 | × 1000 | = 3.1 µm |
| 2063 |
JD 4100 zoom pixel pitch
Sensor width = 7.11 mm
Sensor resolution width = 2343 pixels
Sensor resolution width = 2343 pixels
| Pixel pitch = | 7.11 | × 1000 | = 3.03 µm |
| 2343 |
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
| Pixel area = | sensor surface area in mm² |
| effective megapixels |
Digi 30 pixel area
Pixel pitch = 3.1 µm
Pixel area = 3.1² = 9.61 µm²
Pixel area = 3.1² = 9.61 µm²
JD 4100 zoom pixel area
Pixel pitch = 3.03 µm
Pixel area = 3.03² = 9.18 µm²
Pixel area = 3.03² = 9.18 µm²
Pixel density
Pixel density can be calculated with the following formula:
One could also use this 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 |
Digi 30 pixel density
Sensor resolution width = 2063 pixels
Sensor width = 0.64 cm
Pixel density = (2063 / 0.64)² / 1000000 = 10.39 MP/cm²
Sensor width = 0.64 cm
Pixel density = (2063 / 0.64)² / 1000000 = 10.39 MP/cm²
JD 4100 zoom pixel density
Sensor resolution width = 2343 pixels
Sensor width = 0.711 cm
Pixel density = (2343 / 0.711)² / 1000000 = 10.86 MP/cm²
Sensor width = 0.711 cm
Pixel density = (2343 / 0.711)² / 1000000 = 10.86 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:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
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 → |
|
Resolution horizontal: X × r
Resolution vertical: X
Digi 30 sensor resolution
Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 3.20
Resolution horizontal: X × r = 1551 × 1.33 = 2063
Resolution vertical: X = 1551
Sensor resolution = 2063 x 1551
Sensor height = 4.80 mm
Effective megapixels = 3.20
| r = 6.40/4.80 = 1.33 |
|
Resolution vertical: X = 1551
Sensor resolution = 2063 x 1551
JD 4100 zoom sensor resolution
Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 4.13
Resolution horizontal: X × r = 1762 × 1.33 = 2343
Resolution vertical: X = 1762
Sensor resolution = 2343 x 1762
Sensor height = 5.33 mm
Effective megapixels = 4.13
| r = 7.11/5.33 = 1.33 |
|
Resolution vertical: X = 1762
Sensor resolution = 2343 x 1762
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 |
Digi 30 crop factor
Sensor diagonal in mm = 8.00 mm
| Crop factor = | 43.27 | = 5.41 |
| 8.00 |
JD 4100 zoom 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).
Digi 30 equivalent aperture
Crop factor = 5.41
Aperture = f2.8
35-mm equivalent aperture = (f2.8) × 5.41 = f15.1
Aperture = f2.8
35-mm equivalent aperture = (f2.8) × 5.41 = f15.1
JD 4100 zoom equivalent aperture
Crop factor = 4.87
Aperture = f2.7 - f4.9
35-mm equivalent aperture = (f2.7 - f4.9) × 4.87 = f13.1 - f23.9
Aperture = f2.7 - f4.9
35-mm equivalent aperture = (f2.7 - f4.9) × 4.87 = f13.1 - f23.9
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My screen size is
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Actual size is currently adjusted to screen.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.
If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.