Kodak DX6490 vs. Kodak EasyShare Z990

Comparison

DX6490 image
vs.
EasyShare Z990 image

 

Kodak DX6490 Kodak EasyShare Z990
Megapixels
4.00 12.00
Max. resolution
2304 x 1728 4000 x 3000
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
CCD BSI CMOS
Sensor size
1/2.5" (~ 5.75 x 4.32 mm) 1/2.33" (~ 6.08 x 4.56 mm)
Sensor resolution
2306 x 1734  3995 x 3004 
Diagonal
7.19 mm  7.60 mm 
Surface area
24.84 mm²  27.72 mm² 
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 sizes:
Kodak DX6490
vs.
Kodak EasyShare Z990
 
Surface area:
Kodak DX6490
Kodak EasyShare Z990
Difference: 2.88 mm² (12%)
Kodak EasyShare Z990 has approx. 12% more surface area than Kodak DX6490.
Note: You are comparing sensors of very different generations. There is a gap of 8 years between Kodak DX6490 (2003) and Kodak EasyShare Z990 (2011). Eight years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
2.49 µm  1.52 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.
Pixel pitch
Kodak DX6490
Kodak EasyShare Z990
Difference: 0.97 µm (64%)
Pixel pitch of Kodak DX6490 is approx. 64% higher than pixel pitch of Kodak EasyShare Z990.
Pixel area
6.2 µm²  2.31 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:
Kodak DX6490
vs.
Kodak EasyShare Z990
Pixel area difference: 3.89 µm² (168%)
A pixel on Kodak DX6490 sensor is approx. 168% bigger than a pixel on Kodak EasyShare Z990.
Pixel density
16.08 MP/cm²  43.17 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.
Pixel density
Kodak DX6490
Kodak EasyShare Z990
Difference: 27.09 MP/cm² (168%)
Kodak EasyShare Z990 has approx. 168% higher pixel density than Kodak DX6490.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
6.02  5.69 
Total megapixels
4.20 n/a
Effective megapixels
4.00 12.00
Optical zoom
10x 30x
Digital zoom
Yes Yes
Iso
Auto, 80, 100, 200, 400, 800 Auto, 125, 200, 400, 800, 1600, 3200 and 6400
Auto focus
Yes Yes
Manual focus
No Yes
Normal focus range
60 cm 70 cm
Macro focus range
12 cm 1 cm
Focal length (35mm equiv.)
38 - 380 mm 28 - 840 mm
Aperture priority
Yes Yes
Aperture
f2.8 - f3.7 f2.8 - f5.6
Aperture (35mm equiv.)
f16.9 - f22.3  f15.9 - f31.9 
Metering
Multi, Center-weighted, Spot Multi, Center-weighted, Spot
Exposure compensation
±2 EV (at 1/3 EV steps) ±2 EV (at 1/3 EV steps)
Shutter priority
Yes Yes
Min. shutter speed
16 sec 16 sec
Max. shutter speed
1/1700 sec 1/2000 sec
Flash modes
Auto, Fill-in, Red-Eye reduction, Off Auto, Fill-in, Red-Eye reduction, Off
Built-in flash
Yes Yes
External flash
Yes No
Viewfinder
Electronic Electronic
White balance presets
4 4
LCD display
Yes Yes
LCD size
2.2" 3"
LCD resolution
153,000 460,000
Min. image resolution
n/a 2048 x 1536
Selftimer
Yes Yes
Storage types
SD/MMC card, Internal SD/SDHC card, Internal
USB
USB 1.0 (1.5 Mbit/sec) USB 2.0 (480 Mbit/sec)
Batteries
Kodak Lithium-Ion, dock & charger (optional) AA (4) batteries (NiMH Rechargeable batteries)
Weight
380g 445g
Dimensions
100x80x81 mm 124x91x105 mm
Year
2003 2011



Compare other cameras

Popular comparisons:

Choose other cameras to compare:



comments powered by Disqus

Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Kodak DX6490 diagonal

The diagonal of Kodak DX6490 image sensor is not 1/2.5 inch as you might expect, but approximately two thirds of that value. 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 EasyShare Z990 diagonal

The diagonal of Kodak EasyShare Z990 image sensor is not 1/2.33 inch as you might expect, but approximately two thirds of that value. If you want to know why, see sensor sizes.

w = 6.08 mm
h = 4.56 mm
Diagonal =  6.08² + 4.56²   = 7.60 mm


Surface area

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

Kodak DX6490 surface area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

Kodak EasyShare Z990 surface area

Width = 6.08 mm
Height = 4.56 mm

Surface area = 6.08 × 4.56 = 27.72 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

Kodak DX6490 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2306 pixels
Pixel pitch =   5.75  × 1000  = 2.49 µm
2306

Kodak EasyShare Z990 pixel pitch

Sensor width = 6.08 mm
Sensor resolution width = 3995 pixels
Pixel pitch =   6.08  × 1000  = 1.52 µm
3995


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

Kodak DX6490 pixel area

Pixel pitch = 2.49 µm

Pixel area = 2.49² = 6.2 µm²

Kodak EasyShare Z990 pixel area

Pixel pitch = 1.52 µm

Pixel area = 1.52² = 2.31 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

You could also use this formula:
Pixel density =   effective megapixels × 1000000  / 10000
sensor surface area in mm²

Kodak DX6490 pixel density

Sensor resolution width = 2306 pixels
Sensor width = 0.575 cm

Pixel density = (2306 / 0.575)² / 1000000 = 16.08 MP/cm²

Kodak EasyShare Z990 pixel density

Sensor resolution width = 3995 pixels
Sensor width = 0.608 cm

Pixel density = (3995 / 0.608)² / 1000000 = 43.17 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. 22.8 × 15.5 sensor for example has a ratio of 1.47.

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

Kodak DX6490 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 4.00
r = 5.75/4.32 = 1.33
X =  4.00 × 1000000  = 1734
1.33
Resolution horizontal: X × r = 1734 × 1.33 = 2306
Resolution vertical: X = 1734

Sensor resolution = 2306 x 1734

Kodak EasyShare Z990 sensor resolution

Sensor width = 6.08 mm
Sensor height = 4.56 mm
Effective megapixels = 12.00
r = 6.08/4.56 = 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


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


Kodak DX6490 crop factor

Sensor diagonal in mm = 7.19 mm
Crop factor =   43.27  = 6.02
7.19

Kodak EasyShare Z990 crop factor

Sensor diagonal in mm = 7.60 mm
Crop factor =   43.27  = 5.69
7.60

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).

Kodak DX6490 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f3.7

35-mm equivalent aperture = (f2.8 - f3.7) × 6.02 = f16.9 - f22.3

Kodak EasyShare Z990 equivalent aperture

Crop factor = 5.69
Aperture = f2.8 - f5.6

35-mm equivalent aperture = (f2.8 - f5.6) × 5.69 = f15.9 - f31.9


All trademarks and product names are property of their respective owners. User comments are not the responsibility of digicamdb.com.