Yakumo Mega Image II vs. Yakumo Mega Image IV

Comparison

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Mega Image II image
vs
Mega Image IV image
Yakumo Mega Image II Yakumo Mega Image IV
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Megapixels
2.10
2.00
Max. image resolution
1600 x 1200
2304 x 1728

Sensor

Sensor type
CMOS
CMOS
Sensor size
1/1.8" (~ 7.11 x 5.33 mm)
1/1.8" (~ 7.11 x 5.33 mm)
Sensor resolution
1672 x 1257
1631 x 1226
Diagonal
8.89 mm
8.89 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 : 1
(ratio)
Yakumo Mega Image II Yakumo Mega Image IV
Surface area:
37.90 mm² vs 37.90 mm²
Difference: 0 mm² (0%)
II and IV sensors are the same size.
Pixel pitch
4.25 µm
4.36 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: 0.11 µm (3%)
Pixel pitch of IV is approx. 3% higher than pixel pitch of II.
Pixel area
18.06 µm²
19.01 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: 0.95 µm² (5%)
A pixel on Yakumo IV sensor is approx. 5% bigger than a pixel on Yakumo II.
Pixel density
5.53 MP/cm²
5.26 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: 0.27 µm (5%)
Yakumo II has approx. 5% higher pixel density than Yakumo IV.
To learn about the accuracy of these numbers, click here.



Specs

Yakumo II
Yakumo IV
Crop factor
4.87
4.87
Total megapixels
Effective megapixels
Optical zoom
No
No
Digital zoom
Yes
Yes
ISO sensitivity
Auto
Auto
RAW
Manual focus
Normal focus range
70 cm
160 cm
Macro focus range
40 cm
55 cm
Focal length (35mm equiv.)
Aperture priority
No
No
Max. aperture
f2.8
Max. aperture (35mm equiv.)
n/a
f13.6
Metering
Centre weighted
Centre weighted
Exposure compensation
Shutter priority
No
No
Min. shutter speed
Max. shutter speed
Built-in flash
External flash
Viewfinder
Optical
Optical
White balance presets
5
5
Screen size
1.8"
1.5"
Screen resolution
63,360 dots
63,360 dots
Video capture
Max. video resolution
Storage types
CompactFlash type I
Secure Digital
USB
USB 1.1
USB 1.1
HDMI
Wireless
GPS
Battery
2x AA
2x AA
Weight
148 g
120 g
Dimensions
95 x 63 x 42 mm
94 x 61 x 40 mm
Year
2002
2002




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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

Yakumo II diagonal

The diagonal of II 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
Diagonal =  7.11² + 5.33²   = 8.89 mm

Yakumo IV diagonal

The diagonal of IV 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
Diagonal =  7.11² + 5.33²   = 8.89 mm


Surface area

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

II sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

IV sensor area

Width = 7.11 mm
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

II pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 1672 pixels
Pixel pitch =   7.11  × 1000  = 4.25 µm
1672

IV pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 1631 pixels
Pixel pitch =   7.11  × 1000  = 4.36 µm
1631


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

II pixel area

Pixel pitch = 4.25 µm

Pixel area = 4.25² = 18.06 µm²

IV pixel area

Pixel pitch = 4.36 µm

Pixel area = 4.36² = 19.01 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

II pixel density

Sensor resolution width = 1672 pixels
Sensor width = 0.711 cm

Pixel density = (1672 / 0.711)² / 1000000 = 5.53 MP/cm²

IV pixel density

Sensor resolution width = 1631 pixels
Sensor width = 0.711 cm

Pixel density = (1631 / 0.711)² / 1000000 = 5.26 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

II sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 2.10
r = 7.11/5.33 = 1.33
X =  2.10 × 1000000  = 1257
1.33
Resolution horizontal: X × r = 1257 × 1.33 = 1672
Resolution vertical: X = 1257

Sensor resolution = 1672 x 1257

IV sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 2.00
r = 7.11/5.33 = 1.33
X =  2.00 × 1000000  = 1226
1.33
Resolution horizontal: X × r = 1226 × 1.33 = 1631
Resolution vertical: X = 1226

Sensor resolution = 1631 x 1226


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


II crop factor

Sensor diagonal in mm = 8.89 mm
Crop factor =   43.27  = 4.87
8.89

IV 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).

II equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Yakumo II, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Yakumo II is 4.87

IV equivalent aperture

Crop factor = 4.87
Aperture = f2.8

35-mm equivalent aperture = (f2.8) × 4.87 = f13.6

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