Jenoptik JD 4100 zoom vs. Pentax Optio 750Z
Comparison
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| Jenoptik JD 4100 zoom | Pentax Optio 750Z | ||||
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Megapixels
4.13
7.10
Max. image resolution
2272 x 1704
3056 x 2296
Sensor
Sensor type
CCD
CCD
Sensor size
1/1.8" (~ 7.11 x 5.33 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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| Jenoptik JD 4100 zoom | Pentax Optio 750Z | |
Surface area:
| 37.90 mm² | vs | 37.90 mm² |
Difference: 0 mm² (0%)
JD 4100 zoom and 750Z sensors are the same size.
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: 3.84 µm² (72%)
A pixel on Jenoptik JD 4100 zoom sensor is approx. 72% bigger than a pixel on Pentax 750Z.
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
Jenoptik JD 4100 zoom
Pentax 750Z
Total megapixels
7.40
Effective megapixels
7.10
Optical zoom
Yes
5x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400
Auto, 80, 100, 200, 400
RAW
Manual focus
Normal focus range
40 cm
60 cm
Macro focus range
10 cm
2 cm
Focal length (35mm equiv.)
37 - 111 mm
38 - 188 mm
Aperture priority
No
Yes
Max. aperture
f2.7 - f4.9
f2.8 - f4.6
Metering
Centre weighted, Matrix
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
8 sec
15 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
Optical
Optical (tunnel)
White balance presets
6
5
Screen size
1.5"
1.8"
Screen resolution
134,000 dots
Video capture
Max. video resolution
Storage types
Secure Digital
SD card
USB
USB 1.1
USB 1.0
HDMI
Wireless
GPS
Battery
2x AA
Lithium-Ion rechargeable
Weight
160 g
255 g
Dimensions
107 x 60 x 36 mm
100 x 62 x 42 mm
Year
2004
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 |
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 |
Pentax 750Z diagonal
The diagonal of 750Z 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.
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
750Z 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 |
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 |
750Z pixel pitch
Sensor width = 7.11 mm
Sensor resolution width = 3072 pixels
Sensor resolution width = 3072 pixels
| Pixel pitch = | 7.11 | × 1000 | = 2.31 µm |
| 3072 |
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 |
JD 4100 zoom pixel area
Pixel pitch = 3.03 µm
Pixel area = 3.03² = 9.18 µm²
Pixel area = 3.03² = 9.18 µm²
750Z pixel area
Pixel pitch = 2.31 µm
Pixel area = 2.31² = 5.34 µm²
Pixel area = 2.31² = 5.34 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 |
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
750Z pixel density
Sensor resolution width = 3072 pixels
Sensor width = 0.711 cm
Pixel density = (3072 / 0.711)² / 1000000 = 18.67 MP/cm²
Sensor width = 0.711 cm
Pixel density = (3072 / 0.711)² / 1000000 = 18.67 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:
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
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
750Z sensor resolution
Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 7.10
Resolution horizontal: X × r = 2310 × 1.33 = 3072
Resolution vertical: X = 2310
Sensor resolution = 3072 x 2310
Sensor height = 5.33 mm
Effective megapixels = 7.10
| r = 7.11/5.33 = 1.33 |
|
Resolution vertical: X = 2310
Sensor resolution = 3072 x 2310
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 |
JD 4100 zoom crop factor
Sensor diagonal in mm = 8.89 mm
| Crop factor = | 43.27 | = 4.87 |
| 8.89 |
750Z 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).
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
750Z equivalent aperture
Crop factor = 4.87
Aperture = f2.8 - f4.6
35-mm equivalent aperture = (f2.8 - f4.6) × 4.87 = f13.6 - f22.4
Aperture = f2.8 - f4.6
35-mm equivalent aperture = (f2.8 - f4.6) × 4.87 = f13.6 - f22.4
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