Ricoh GR III vs. Ricoh G900

Comparison

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GR III image
vs
G900 image
Ricoh GR III Ricoh G900
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Megapixels
24.24
20.00
Max. image resolution
6000 x 4000
5184 x 3888

Sensor

Sensor type
CMOS
CMOS
Sensor size
23.5 x 15.6 mm
1/2.3" (~ 6.16 x 4.62 mm)
Sensor resolution
6051 x 4007
5158 x 3878
Diagonal
28.21 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
12.88 : 1
(ratio)
Ricoh GR III Ricoh G900
Surface area:
366.60 mm² vs 28.46 mm²
Difference: 338.14 mm² (1188%)
GR III sensor is approx. 12.88x bigger than G900 sensor.
Pixel pitch
3.88 µm
1.19 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: 2.69 µm (226%)
Pixel pitch of GR III is approx. 226% higher than pixel pitch of G900.
Pixel area
15.05 µm²
1.42 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: 13.63 µm² (960%)
A pixel on Ricoh GR III sensor is approx. 960% bigger than a pixel on Ricoh G900.
Pixel density
6.63 MP/cm²
70.11 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: 63.48 µm (957%)
Ricoh G900 has approx. 957% higher pixel density than Ricoh GR III.
To learn about the accuracy of these numbers, click here.



Specs

Ricoh GR III
Ricoh G900
Crop factor
1.53
5.62
Total megapixels
Effective megapixels
24.24
20.00
Optical zoom
1x
5x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100-102400
Auto, 125-25600
RAW
Manual focus
Normal focus range
10 cm
50 cm
Macro focus range
6 cm
1 cm
Focal length (35mm equiv.)
28 mm
28 - 140 mm
Aperture priority
Yes
No
Max. aperture
f2.8
f3.5 - f5.5
Max. aperture (35mm equiv.)
f4.3
f19.7 - f30.9
Metering
Multi, Center-weighted, Highlight-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±5 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
No
Min. shutter speed
30 sec
1/4 sec
Max. shutter speed
1/4000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (optional)
None
White balance presets
8
6
Screen size
3"
3"
Screen resolution
1,036,800 dots
1,040,000 dots
Video capture
Max. video resolution
1920x1080 (60p/30p/24p)
3840x2160 (30p)
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC
USB
USB 3.0 (5 GBit/sec)
USB 3.0 (5 GBit/sec)
HDMI
Wireless
GPS
Battery
DB-110 lithium-ion battery
DB-110 lithium-ion battery
Weight
257 g
247 g
Dimensions
109.4 x 61.9 x 33.2 mm
118.2 x 65.5 x 33.1 mm
Year
2019
2019




Choose cameras to compare

vs

Diagonal

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

Ricoh GR III diagonal

w = 23.50 mm
h = 15.60 mm
Diagonal =  23.50² + 15.60²   = 28.21 mm

Ricoh G900 diagonal

The diagonal of G900 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.

GR III sensor area

Width = 23.50 mm
Height = 15.60 mm

Surface area = 23.50 × 15.60 = 366.60 mm²

G900 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

GR III pixel pitch

Sensor width = 23.50 mm
Sensor resolution width = 6051 pixels
Pixel pitch =   23.50  × 1000  = 3.88 µm
6051

G900 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 5158 pixels
Pixel pitch =   6.16  × 1000  = 1.19 µm
5158


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

GR III pixel area

Pixel pitch = 3.88 µm

Pixel area = 3.88² = 15.05 µm²

G900 pixel area

Pixel pitch = 1.19 µm

Pixel area = 1.19² = 1.42 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

GR III pixel density

Sensor resolution width = 6051 pixels
Sensor width = 2.35 cm

Pixel density = (6051 / 2.35)² / 1000000 = 6.63 MP/cm²

G900 pixel density

Sensor resolution width = 5158 pixels
Sensor width = 0.616 cm

Pixel density = (5158 / 0.616)² / 1000000 = 70.11 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

GR III sensor resolution

Sensor width = 23.50 mm
Sensor height = 15.60 mm
Effective megapixels = 24.24
r = 23.50/15.60 = 1.51
X =  24.24 × 1000000  = 4007
1.51
Resolution horizontal: X × r = 4007 × 1.51 = 6051
Resolution vertical: X = 4007

Sensor resolution = 6051 x 4007

G900 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 20.00
r = 6.16/4.62 = 1.33
X =  20.00 × 1000000  = 3878
1.33
Resolution horizontal: X × r = 3878 × 1.33 = 5158
Resolution vertical: X = 3878

Sensor resolution = 5158 x 3878


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


GR III crop factor

Sensor diagonal in mm = 28.21 mm
Crop factor =   43.27  = 1.53
28.21

G900 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).

GR III equivalent aperture

Crop factor = 1.53
Aperture = f2.8

35-mm equivalent aperture = (f2.8) × 1.53 = f4.3

G900 equivalent aperture

Crop factor = 5.62
Aperture = f3.5 - f5.5

35-mm equivalent aperture = (f3.5 - f5.5) × 5.62 = f19.7 - f30.9

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