Ricoh RDC-i500 vs. Ricoh RDC-7

Comparison

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RDC-i500 image
vs
RDC-7 image
Ricoh RDC-i500 Ricoh RDC-7
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Megapixels
3.10
3.10
Max. image resolution
2048 x 1536
3072 x 2304

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 resolution
2031 x 1527
2031 x 1527
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)
Ricoh RDC-i500 Ricoh RDC-7
Surface area:
37.90 mm² vs 37.90 mm²
Difference: 0 mm² (0%)
RDC-i500 and RDC-7 sensors are the same size.
Pixel pitch
3.5 µm
3.5 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 µm (0%)
RDC-i500 and RDC-7 have the same pixel pitch.
Pixel area
12.25 µm²
12.25 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 µm² (0%)
Ricoh RDC-i500 and Ricoh RDC-7 have the same pixel area.
Pixel density
8.16 MP/cm²
8.16 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 µm (0%)
Ricoh RDC-i500 and Ricoh RDC-7 have the same pixel density.
To learn about the accuracy of these numbers, click here.



Specs

Ricoh RDC-i500
Ricoh RDC-7
Crop factor
4.87
4.87
Total megapixels
3.30
3.30
Effective megapixels
3.10
3.10
Optical zoom
3x
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 150, 200, 400, 800
Auto, 150, 200, 400
RAW
Manual focus
Normal focus range
24 cm
24 cm
Macro focus range
1 cm
1 cm
Focal length (35mm equiv.)
35 - 105 mm
35 - 105 mm
Aperture priority
No
No
Max. aperture
f2.6 - f3.4
f2.6 - f3.4
Max. aperture (35mm equiv.)
f12.7 - f16.6
f12.7 - f16.6
Metering
Centre weighted, Multi-segment, Spot
Centre weighted
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/2 EV steps)
Shutter priority
No
No
Min. shutter speed
8 sec
8 sec
Max. shutter speed
1/2000 sec
1/1000 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
Optical (tunnel)
White balance presets
5
4
Screen size
2"
2"
Screen resolution
200,000 dots
200,640 dots
Video capture
Max. video resolution
Storage types
CompactFlash type I, CompactFlash type II, Microdrive
SmartMedia
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable
Lithium-Ion rechargeable
Weight
350 g
320 g
Dimensions
142 x 31 x 78 mm
135 x 26 x 74 mm
Year
2001
2000




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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

Ricoh RDC-i500 diagonal

The diagonal of RDC-i500 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

Ricoh RDC-7 diagonal

The diagonal of RDC-7 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.

RDC-i500 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

RDC-7 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

RDC-i500 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2031 pixels
Pixel pitch =   7.11  × 1000  = 3.5 µm
2031

RDC-7 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2031 pixels
Pixel pitch =   7.11  × 1000  = 3.5 µm
2031


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

RDC-i500 pixel area

Pixel pitch = 3.5 µm

Pixel area = 3.5² = 12.25 µm²

RDC-7 pixel area

Pixel pitch = 3.5 µm

Pixel area = 3.5² = 12.25 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

RDC-i500 pixel density

Sensor resolution width = 2031 pixels
Sensor width = 0.711 cm

Pixel density = (2031 / 0.711)² / 1000000 = 8.16 MP/cm²

RDC-7 pixel density

Sensor resolution width = 2031 pixels
Sensor width = 0.711 cm

Pixel density = (2031 / 0.711)² / 1000000 = 8.16 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

RDC-i500 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.10
r = 7.11/5.33 = 1.33
X =  3.10 × 1000000  = 1527
1.33
Resolution horizontal: X × r = 1527 × 1.33 = 2031
Resolution vertical: X = 1527

Sensor resolution = 2031 x 1527

RDC-7 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.10
r = 7.11/5.33 = 1.33
X =  3.10 × 1000000  = 1527
1.33
Resolution horizontal: X × r = 1527 × 1.33 = 2031
Resolution vertical: X = 1527

Sensor resolution = 2031 x 1527


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


RDC-i500 crop factor

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

RDC-7 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).

RDC-i500 equivalent aperture

Crop factor = 4.87
Aperture = f2.6 - f3.4

35-mm equivalent aperture = (f2.6 - f3.4) × 4.87 = f12.7 - f16.6

RDC-7 equivalent aperture

Crop factor = 4.87
Aperture = f2.6 - f3.4

35-mm equivalent aperture = (f2.6 - f3.4) × 4.87 = f12.7 - f16.6

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