Epson R-D1 vs. Ricoh GXR Mount A12

Comparison

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R-D1 image
vs
GXR Mount A12 image
Epson R-D1 Ricoh GXR Mount A12
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Megapixels
6.00
12.30
Max. image resolution
3008 x 2000
4288 x 2848

Sensor

Sensor type
CCD
CMOS
Sensor size
23.7 x 15.6 mm
23.6 x 15.7 mm
Sensor resolution
3020 x 1987
4296 x 2864
Diagonal
28.37 mm
28.35 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 »
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1 : 1
(ratio)
Epson R-D1 Ricoh GXR Mount A12
Surface area:
369.72 mm² vs 370.52 mm²
Difference: 0.8 mm² (0.2%)
GXR Mount A12 sensor is slightly bigger than R-D1 sensor (only 0.2% difference).
Note: You are comparing sensors of very different generations. There is a gap of 7 years between Epson R-D1 (2004) and Ricoh GXR Mount A12 (2011). Seven years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
7.85 µm
5.49 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: 2.36 µm (43%)
Pixel pitch of R-D1 is approx. 43% higher than pixel pitch of GXR Mount A12.
Pixel area
61.62 µm²
30.14 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: 31.48 µm² (104%)
A pixel on Epson R-D1 sensor is approx. 104% bigger than a pixel on Ricoh GXR Mount A12.
Pixel density
1.62 MP/cm²
3.31 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: 1.69 µm (104%)
Ricoh GXR Mount A12 has approx. 104% higher pixel density than Epson R-D1.
To learn about the accuracy of these numbers, click here.



Specs

Epson R-D1
Ricoh GXR Mount A12
Crop factor
1.53
1.53
Total megapixels
6.20
12.90
Effective megapixels
6.00
12.30
Optical zoom
Digital zoom
No
ISO sensitivity
200, 400, 800, 1600
Auto, Auto-Hi, 200, 400, 800,1600, 3200
RAW
Manual focus
Normal focus range
Macro focus range
Focal length (35mm equiv.)
Aperture priority
Yes
Yes
Max. aperture
Max. aperture (35mm equiv.)
n/a
n/a
Metering
Centre weighted
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±4 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1 sec
1 sec
Max. shutter speed
1/2000 sec
1/9000 sec
Built-in flash
External flash
Viewfinder
Optical (rangefinder)
Electronic (optional)
White balance presets
6
5
Screen size
2"
3"
Screen resolution
235,000 dots
920,000 dots
Video capture
Max. video resolution
Storage types
Secure Digital
SD/SDHC, Internal
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion rechargeable
Lithium-Ion DB-90 rechargeable battery
Weight
620 g
370 g
Dimensions
142 x 88.5 x 39.5 mm
120 x 70 x 45 mm
Year
2004
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

Epson R-D1 diagonal

w = 23.70 mm
h = 15.60 mm
Diagonal =  23.70² + 15.60²   = 28.37 mm

Ricoh GXR Mount A12 diagonal

w = 23.60 mm
h = 15.70 mm
Diagonal =  23.60² + 15.70²   = 28.35 mm


Surface area

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

R-D1 sensor area

Width = 23.70 mm
Height = 15.60 mm

Surface area = 23.70 × 15.60 = 369.72 mm²

GXR Mount A12 sensor area

Width = 23.60 mm
Height = 15.70 mm

Surface area = 23.60 × 15.70 = 370.52 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

R-D1 pixel pitch

Sensor width = 23.70 mm
Sensor resolution width = 3020 pixels
Pixel pitch =   23.70  × 1000  = 7.85 µm
3020

GXR Mount A12 pixel pitch

Sensor width = 23.60 mm
Sensor resolution width = 4296 pixels
Pixel pitch =   23.60  × 1000  = 5.49 µm
4296


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

R-D1 pixel area

Pixel pitch = 7.85 µm

Pixel area = 7.85² = 61.62 µm²

GXR Mount A12 pixel area

Pixel pitch = 5.49 µm

Pixel area = 5.49² = 30.14 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

R-D1 pixel density

Sensor resolution width = 3020 pixels
Sensor width = 2.37 cm

Pixel density = (3020 / 2.37)² / 1000000 = 1.62 MP/cm²

GXR Mount A12 pixel density

Sensor resolution width = 4296 pixels
Sensor width = 2.36 cm

Pixel density = (4296 / 2.36)² / 1000000 = 3.31 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

R-D1 sensor resolution

Sensor width = 23.70 mm
Sensor height = 15.60 mm
Effective megapixels = 6.00
r = 23.70/15.60 = 1.52
X =  6.00 × 1000000  = 1987
1.52
Resolution horizontal: X × r = 1987 × 1.52 = 3020
Resolution vertical: X = 1987

Sensor resolution = 3020 x 1987

GXR Mount A12 sensor resolution

Sensor width = 23.60 mm
Sensor height = 15.70 mm
Effective megapixels = 12.30
r = 23.60/15.70 = 1.5
X =  12.30 × 1000000  = 2864
1.5
Resolution horizontal: X × r = 2864 × 1.5 = 4296
Resolution vertical: X = 2864

Sensor resolution = 4296 x 2864


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


R-D1 crop factor

Sensor diagonal in mm = 28.37 mm
Crop factor =   43.27  = 1.53
28.37

GXR Mount A12 crop factor

Sensor diagonal in mm = 28.35 mm
Crop factor =   43.27  = 1.53
28.35

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).

R-D1 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 Epson R-D1, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Epson R-D1 is 1.53

GXR Mount A12 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 Ricoh GXR Mount A12, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Ricoh GXR Mount A12 is 1.53

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