Ricoh CX1 vs. Ricoh PX

Comparison

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CX1 image
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PX image
Ricoh CX1 Ricoh PX
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Megapixels
9.30
16.00
Max. image resolution
3456 x 2592
4608 x 3456

Sensor

Sensor type
CMOS
CCD
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/2.3" (~ 6.16 x 4.62 mm)
Sensor resolution
3517 x 2644
4612 x 3468
Diagonal
7.70 mm
7.70 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 CX1 Ricoh PX
Surface area:
28.46 mm² vs 28.46 mm²
Difference: 0 mm² (0%)
CX1 and PX sensors are the same size.
Note: You are comparing cameras of different generations. There is a 2 year gap between Ricoh CX1 (2009) and Ricoh PX (2011). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.75 µm
1.34 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: 0.41 µm (31%)
Pixel pitch of CX1 is approx. 31% higher than pixel pitch of PX.
Pixel area
3.06 µm²
1.8 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: 1.26 µm² (70%)
A pixel on Ricoh CX1 sensor is approx. 70% bigger than a pixel on Ricoh PX.
Pixel density
32.6 MP/cm²
56.06 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: 23.46 µm (72%)
Ricoh PX has approx. 72% higher pixel density than Ricoh CX1.
To learn about the accuracy of these numbers, click here.



Specs

Ricoh CX1
Ricoh PX
Crop factor
5.62
5.62
Total megapixels
10.30
16.40
Effective megapixels
9.30
16.00
Optical zoom
7.1x
5x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 80, 100, 200, 400, 800, 1600
Auto, 100 - 3200
RAW
Manual focus
Normal focus range
20 cm
50 cm
Macro focus range
1 cm
3 cm
Focal length (35mm equiv.)
28 - 200 mm
28 - 140 mm
Aperture priority
No
No
Max. aperture
f3.3 - f5.2
f3.9 - f5.4
Max. aperture (35mm equiv.)
f18.5 - f29.2
f21.9 - f30.3
Metering
Centre weighted, Multi-segment, Spot
Centre weighted, Multi-segment, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
8 sec
8 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
5
6
Screen size
3"
2.7"
Screen resolution
920,000 dots
230,000 dots
Video capture
Max. video resolution
Storage types
SDHC, Secure Digital
SDHC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion DB-70 rechargeable battery
Lithium-Ion DB-100 rechargeable battery
Weight
180 g
136 g
Dimensions
102 x 58 x 28 mm
100 x 55 x 21.3 mm
Year
2009
2011




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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 CX1 diagonal

The diagonal of CX1 sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal = √  6.16² + 4.62²   = 7.70 mm

Ricoh PX diagonal

The diagonal of PX sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal = √  6.16² + 4.62²   = 7.70 mm


Surface area

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

CX1 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

PX sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 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

CX1 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 3517 pixels
Pixel pitch =   6.16  × 1000  = 1.75 µm
3517

PX pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4612 pixels
Pixel pitch =   6.16  × 1000  = 1.34 µm
4612


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

CX1 pixel area

Pixel pitch = 1.75 µm

Pixel area = 1.75² = 3.06 µm²

PX pixel area

Pixel pitch = 1.34 µm

Pixel area = 1.34² = 1.8 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

CX1 pixel density

Sensor resolution width = 3517 pixels
Sensor width = 0.616 cm

Pixel density = (3517 / 0.616)² / 1000000 = 32.6 MP/cm²

PX pixel density

Sensor resolution width = 4612 pixels
Sensor width = 0.616 cm

Pixel density = (4612 / 0.616)² / 1000000 = 56.06 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

CX1 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 9.30
r = 6.16/4.62 = 1.33
X = √  9.30 × 1000000  = 2644
1.33
Resolution horizontal: X × r = 2644 × 1.33 = 3517
Resolution vertical: X = 2644

Sensor resolution = 3517 x 2644

PX sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 16.00
r = 6.16/4.62 = 1.33
X = √  16.00 × 1000000  = 3468
1.33
Resolution horizontal: X × r = 3468 × 1.33 = 4612
Resolution vertical: X = 3468

Sensor resolution = 4612 x 3468


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


CX1 crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

PX crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

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).

CX1 equivalent aperture

Crop factor = 5.62
Aperture = f3.3 - f5.2

35-mm equivalent aperture = (f3.3 - f5.2) × 5.62 = f18.5 - f29.2

PX equivalent aperture

Crop factor = 5.62
Aperture = f3.9 - f5.4

35-mm equivalent aperture = (f3.9 - f5.4) × 5.62 = f21.9 - f30.3

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