Kodak EasyShare CX6445 vs. Kodak EasyShare DX6440
Comparison
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| Kodak EasyShare CX6445 | Kodak EasyShare DX6440 | ||||
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Megapixels
4.23
4.00
Max. image resolution
2304 x 1728
2304 x 1728
Sensor
Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/2.5" (~ 5.75 x 4.32 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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| Kodak EasyShare CX6445 | Kodak EasyShare DX6440 | |
Surface area:
| 24.84 mm² | vs | 24.84 mm² |
Difference: 0 mm² (0%)
CX6445 and DX6440 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: 0.3 µm² (5%)
A pixel on Kodak DX6440 sensor is approx. 5% bigger than a pixel on Kodak CX6445.
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
Kodak CX6445
Kodak DX6440
Total megapixels
4.20
Effective megapixels
4.00
Optical zoom
Yes
4x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400
Auto, 100, 200, 400
RAW
Manual focus
Normal focus range
50 cm
50 cm
Macro focus range
10 cm
10 cm
Focal length (35mm equiv.)
33 - 132 mm
33 - 132 mm
Aperture priority
Yes
Yes
Max. aperture
f2.8 - f5
f2.2 - f5.6
Metering
Centre weighted, Multi-pattern, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/2 EV steps)
±2 EV (in 1/2 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
4 sec
4 sec
Max. shutter speed
1/2200 sec
1/2200 sec
Built-in flash
External flash
Viewfinder
Optical
Optical (tunnel)
White balance presets
4
4
Screen size
1.8"
1.8"
Screen resolution
134,000 dots
134,000 dots
Video capture
Max. video resolution
Storage types
MultiMedia, Secure Digital
SD/MMC card, Internal
USB
USB 2.0 (480 Mbit/sec)
USB 1.0
HDMI
Wireless
GPS
Battery
1x CR-V3, 2x AA
AA (2) batteries (NiMH recommended)
Weight
220 g
270 g
Dimensions
109 x 64.5 x 38.2 mm
109 x 65 x 38 mm
Year
2004
2003
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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 |
Kodak CX6445 diagonal
The diagonal of CX6445 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
w = 5.75 mm
h = 4.32 mm
| Diagonal = √ | 5.75² + 4.32² | = 7.19 mm |
Kodak DX6440 diagonal
The diagonal of DX6440 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
w = 5.75 mm
h = 4.32 mm
| Diagonal = √ | 5.75² + 4.32² | = 7.19 mm |
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
CX6445 sensor area
Width = 5.75 mm
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 mm²
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 mm²
DX6440 sensor area
Width = 5.75 mm
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 mm²
Height = 4.32 mm
Surface area = 5.75 × 4.32 = 24.84 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 |
CX6445 pixel pitch
Sensor width = 5.75 mm
Sensor resolution width = 2371 pixels
Sensor resolution width = 2371 pixels
| Pixel pitch = | 5.75 | × 1000 | = 2.43 µm |
| 2371 |
DX6440 pixel pitch
Sensor width = 5.75 mm
Sensor resolution width = 2306 pixels
Sensor resolution width = 2306 pixels
| Pixel pitch = | 5.75 | × 1000 | = 2.49 µm |
| 2306 |
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 |
CX6445 pixel area
Pixel pitch = 2.43 µm
Pixel area = 2.43² = 5.9 µm²
Pixel area = 2.43² = 5.9 µm²
DX6440 pixel area
Pixel pitch = 2.49 µm
Pixel area = 2.49² = 6.2 µm²
Pixel area = 2.49² = 6.2 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 |
CX6445 pixel density
Sensor resolution width = 2371 pixels
Sensor width = 0.575 cm
Pixel density = (2371 / 0.575)² / 1000000 = 17 MP/cm²
Sensor width = 0.575 cm
Pixel density = (2371 / 0.575)² / 1000000 = 17 MP/cm²
DX6440 pixel density
Sensor resolution width = 2306 pixels
Sensor width = 0.575 cm
Pixel density = (2306 / 0.575)² / 1000000 = 16.08 MP/cm²
Sensor width = 0.575 cm
Pixel density = (2306 / 0.575)² / 1000000 = 16.08 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
CX6445 sensor resolution
Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 4.23
Resolution horizontal: X × r = 1783 × 1.33 = 2371
Resolution vertical: X = 1783
Sensor resolution = 2371 x 1783
Sensor height = 4.32 mm
Effective megapixels = 4.23
| r = 5.75/4.32 = 1.33 |
|
Resolution vertical: X = 1783
Sensor resolution = 2371 x 1783
DX6440 sensor resolution
Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 4.00
Resolution horizontal: X × r = 1734 × 1.33 = 2306
Resolution vertical: X = 1734
Sensor resolution = 2306 x 1734
Sensor height = 4.32 mm
Effective megapixels = 4.00
| r = 5.75/4.32 = 1.33 |
|
Resolution vertical: X = 1734
Sensor resolution = 2306 x 1734
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 |
CX6445 crop factor
Sensor diagonal in mm = 7.19 mm
| Crop factor = | 43.27 | = 6.02 |
| 7.19 |
DX6440 crop factor
Sensor diagonal in mm = 7.19 mm
| Crop factor = | 43.27 | = 6.02 |
| 7.19 |
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).
CX6445 equivalent aperture
Crop factor = 6.02
Aperture = f2.8 - f5
35-mm equivalent aperture = (f2.8 - f5) × 6.02 = f16.9 - f30.1
Aperture = f2.8 - f5
35-mm equivalent aperture = (f2.8 - f5) × 6.02 = f16.9 - f30.1
DX6440 equivalent aperture
Crop factor = 6.02
Aperture = f2.2 - f5.6
35-mm equivalent aperture = (f2.2 - f5.6) × 6.02 = f13.2 - f33.7
Aperture = f2.2 - f5.6
35-mm equivalent aperture = (f2.2 - f5.6) × 6.02 = f13.2 - f33.7
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If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a sensor won't be shown correctly.