Ricoh G900 vs. Pentax Q7

Comparison

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G900 image
vs
Q7 image
Ricoh G900 Pentax Q7
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Megapixels
20.00
12.40
Max. image resolution
5184 x 3888
4000 x 3000

Sensor

Sensor type
CMOS
CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/1.7" (~ 7.53 x 5.64 mm)
Sensor resolution
5158 x 3878
4076 x 3042
Diagonal
7.70 mm
9.41 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 : 1.49
(ratio)
Ricoh G900 Pentax Q7
Surface area:
28.46 mm² vs 42.47 mm²
Difference: 14.01 mm² (49%)
Q7 sensor is approx. 1.49x bigger than G900 sensor.
Note: You are comparing sensors of very different generations. There is a gap of 6 years between Ricoh G900 (2019) and Pentax Q7 (2013). Six years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
1.19 µm
1.85 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: 0.66 µm (55%)
Pixel pitch of Q7 is approx. 55% higher than pixel pitch of G900.
Pixel area
1.42 µm²
3.42 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: 2 µm² (141%)
A pixel on Pentax Q7 sensor is approx. 141% bigger than a pixel on Ricoh G900.
Pixel density
70.11 MP/cm²
29.3 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: 40.81 µm (139%)
Ricoh G900 has approx. 139% higher pixel density than Pentax Q7.
To learn about the accuracy of these numbers, click here.



Specs

Ricoh G900
Pentax Q7
Crop factor
5.62
4.6
Total megapixels
12.76
Effective megapixels
20.00
12.40
Optical zoom
5x
Digital zoom
Yes
ISO sensitivity
Auto, 125-25600
Auto, 100 to 12800
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
1 cm
Focal length (35mm equiv.)
28 - 140 mm
Aperture priority
No
Yes
Max. aperture
f3.5 - f5.5
Max. aperture (35mm equiv.)
f19.7 - f30.9
n/a
Metering
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1/4 sec
30 sec
Max. shutter speed
1/4000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
Optical (optional)
White balance presets
6
9
Screen size
3"
3"
Screen resolution
1,040,000 dots
460,000 dots
Video capture
Max. video resolution
3840x2160 (30p)
Storage types
SD/SDHC/SDXC
SD, SDHC, SDXC and Eye-Fi Card
USB
USB 3.0 (5 GBit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
DB-110 lithium-ion battery
Lithium-ion D-LI68
Weight
247 g
200 g
Dimensions
118.2 x 65.5 x 33.1 mm
101.6 x 58.5 x 33.5 mm
Year
2019
2013




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vs

Diagonal

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

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

Pentax Q7 diagonal

The diagonal of Q7 sensor is not 1/1.7 or 0.59" (14.9 mm) as you might expect, but approximately two thirds of that value - 9.41 mm. If you want to know why, see sensor sizes.

w = 7.53 mm
h = 5.64 mm
Diagonal =  7.53² + 5.64²   = 9.41 mm


Surface area

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

G900 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

Q7 sensor area

Width = 7.53 mm
Height = 5.64 mm

Surface area = 7.53 × 5.64 = 42.47 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

G900 pixel pitch

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

Q7 pixel pitch

Sensor width = 7.53 mm
Sensor resolution width = 4076 pixels
Pixel pitch =   7.53  × 1000  = 1.85 µm
4076


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

G900 pixel area

Pixel pitch = 1.19 µm

Pixel area = 1.19² = 1.42 µm²

Q7 pixel area

Pixel pitch = 1.85 µm

Pixel area = 1.85² = 3.42 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

G900 pixel density

Sensor resolution width = 5158 pixels
Sensor width = 0.616 cm

Pixel density = (5158 / 0.616)² / 1000000 = 70.11 MP/cm²

Q7 pixel density

Sensor resolution width = 4076 pixels
Sensor width = 0.753 cm

Pixel density = (4076 / 0.753)² / 1000000 = 29.3 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

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

Q7 sensor resolution

Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 12.40
r = 7.53/5.64 = 1.34
X =  12.40 × 1000000  = 3042
1.34
Resolution horizontal: X × r = 3042 × 1.34 = 4076
Resolution vertical: X = 3042

Sensor resolution = 4076 x 3042


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


G900 crop factor

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

Q7 crop factor

Sensor diagonal in mm = 9.41 mm
Crop factor =   43.27  = 4.6
9.41

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).

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

Q7 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 Pentax Q7, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Pentax Q7 is 4.6

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