Kodak EasyShare CX6445 vs. Kodak EasyShare CX7300

Comparison

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EasyShare CX6445 image
vs
EasyShare CX7300 image
Kodak EasyShare CX6445 Kodak EasyShare CX7300
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Megapixels
4.23
3.20
Max. image resolution
2304 x 1728
2088 x 1544

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/2.7" (~ 5.33 x 4 mm)
Sensor resolution
2371 x 1783
2063 x 1551
Diagonal
7.19 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
1.17 : 1
(ratio)
Kodak EasyShare CX6445 Kodak EasyShare CX7300
Surface area:
24.84 mm² vs 21.32 mm²
Difference: 3.52 mm² (17%)
CX6445 sensor is approx. 1.17x bigger than CX7300 sensor.
Pixel pitch
2.43 µm
2.58 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: 0.15 µm (6%)
Pixel pitch of CX7300 is approx. 6% higher than pixel pitch of CX6445.
Pixel area
5.9 µm²
6.66 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: 0.76 µm² (13%)
A pixel on Kodak CX7300 sensor is approx. 13% bigger than a pixel on Kodak CX6445.
Pixel density
17 MP/cm²
14.98 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: 2.02 µm (13%)
Kodak CX6445 has approx. 13% higher pixel density than Kodak CX7300.
To learn about the accuracy of these numbers, click here.



Specs

Kodak CX6445
Kodak CX7300
Crop factor
6.02
6.5
Total megapixels
3.20
Effective megapixels
3.20
Optical zoom
Yes
1x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400
Auto, 100, 200, 140, 800
RAW
Manual focus
Normal focus range
50 cm
80 cm
Macro focus range
10 cm
60 cm
Focal length (35mm equiv.)
33 - 132 mm
37 mm
Aperture priority
Yes
No
Max. aperture
f2.8 - f5
f4.5
Max. aperture (35mm equiv.)
f16.9 - f30.1
f29.3
Metering
Centre weighted, Multi-pattern, Spot
Centre weighted, Matrix
Exposure compensation
±2 EV (in 1/2 EV steps)
±2 EV (in 1/2 EV steps)
Shutter priority
Yes
No
Min. shutter speed
4 sec
1/2 sec
Max. shutter speed
1/2200 sec
1/2300 sec
Built-in flash
External flash
Viewfinder
Optical
Optical (tunnel)
White balance presets
4
5
Screen size
1.8"
1.6"
Screen resolution
134,000 dots
61,000 dots
Video capture
Max. video resolution
Storage types
MultiMedia, Secure Digital
MultiMedia, Secure Digital
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
147 g
Dimensions
109 x 64.5 x 38.2 mm
103.5 x 65 x 40.2 mm
Year
2004
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

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
Diagonal =  5.75² + 4.32²   = 7.19 mm

Kodak CX7300 diagonal

The diagonal of CX7300 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.

CX6445 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

CX7300 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

CX6445 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2371 pixels
Pixel pitch =   5.75  × 1000  = 2.43 µm
2371

CX7300 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 2063 pixels
Pixel pitch =   5.33  × 1000  = 2.58 µm
2063


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

CX6445 pixel area

Pixel pitch = 2.43 µm

Pixel area = 2.43² = 5.9 µm²

CX7300 pixel area

Pixel pitch = 2.58 µm

Pixel area = 2.58² = 6.66 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

CX6445 pixel density

Sensor resolution width = 2371 pixels
Sensor width = 0.575 cm

Pixel density = (2371 / 0.575)² / 1000000 = 17 MP/cm²

CX7300 pixel density

Sensor resolution width = 2063 pixels
Sensor width = 0.533 cm

Pixel density = (2063 / 0.533)² / 1000000 = 14.98 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

CX6445 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 4.23
r = 5.75/4.32 = 1.33
X =  4.23 × 1000000  = 1783
1.33
Resolution horizontal: X × r = 1783 × 1.33 = 2371
Resolution vertical: X = 1783

Sensor resolution = 2371 x 1783

CX7300 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 3.20
r = 5.33/4.00 = 1.33
X =  3.20 × 1000000  = 1551
1.33
Resolution horizontal: X × r = 1551 × 1.33 = 2063
Resolution vertical: X = 1551

Sensor resolution = 2063 x 1551


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

CX7300 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).

CX6445 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5

35-mm equivalent aperture = (f2.8 - f5) × 6.02 = f16.9 - f30.1

CX7300 equivalent aperture

Crop factor = 6.5
Aperture = f4.5

35-mm equivalent aperture = (f4.5) × 6.5 = f29.3

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