Ricoh G900 Review

Parameters

Brand: Ricoh
Model: G900
Megapixels: 20.00
Sensor: 1/2.3" (~ 6.16 x 4.62 mm)

Sensor Details

Ricoh G900 comes with a 1/2.3" (~ 6.16 x 4.62 mm) CMOS sensor, which has a diagonal of 7.70 mm (0.3") and a surface area of 28.46 mm².
Diagonal
7.70 mm
Surface area
28.5 mm²
Pixel pitch
1.19 µm
Pixel area
1.42 µm²
Pixel density
70.11 MP/cm²

Sensor Size

This is the actual size of the G900 sensor: ~6.16 x 4.62 mm
The sensor surface area is 28.5 mm². There is a resolution of 20,000,000 pixels. Resolution shows the width from the center of one photosite to the center of the following.

The pixel area is 1.42 µm². Pixels give lighter capture and the more data can be recorded.

Ricoh G900 pixel density is 70.11 MP/cm². Pixel density shows how many million pixels meet in one square cm of the sensor.

Features

Brand: Ricoh
Model: G900
Megapixels: 20.00
Sensor size: 1/2.3" (~ 6.16 x 4.62 mm)
Sensor type: CMOS
Sensor resolution: 5158 x 3878
Image resolution: 5184 x 3888
Optical zoom: 5x
Digital zoom:
ISO: Auto, 125-25600
RAW support:
Manual focus:
Normal focus range: 50 cm
Macro focus range: 1 cm
Focal length (35mm equiv.): 28 - 140 mm
Aperture priority: No
Max aperture: f3.5 - f5.5
Max. aperture (35mm equiv.): f19.7 - f30.9
Metering types: Multi, Center-weighted, Spot
Exposure Compensation:
Shutter priority: No
Min. shutter speed: 1/4 sec
Max shutter speed:1/4000s
Built-in flash:
External flash:
Viewfinder: None
Screen size: 3"
Screen resolution: 1,040k dots
Video available:
Video resolution:3840 x 2160
Video modes:30p
Storage:SD/SDHC/SDXC
USB: USB 3.0 (5 GBit/sec)
HDMI:
Wireless available:
GPS:
Battery model:DB-110
Battery type:lithium-ion
Weight: 247 g
Body size:118.2 x 65.5 x 33.1 mm
Released: 2019

Compare G900

vs

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 - 0.3" (7.7 mm). If you want to know why, see sensor sizes.

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


Ricoh G900 diagonal:

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.

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

Ricoh 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

Ricoh 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

You could also use this formula:
Pixel density =   effective megapixels × 1000000 / 10000
sensor surface area in mm²

Ricoh 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

Ricoh 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


Ricoh G900 crop factor:

Sensor diagonal = 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).

Ricoh 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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