Nikon Coolpix S33 vs. Nikon Coolpix S31

Comparison

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Coolpix S33 image
vs
Coolpix S31 image
Nikon Coolpix S33 Nikon Coolpix S31
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Megapixels
13.20
10.10
Max. image resolution
4160 x 3120
3648 x 2736

Sensor

Sensor type
CMOS
CCD
Sensor size
1/3" (~ 4.8 x 3.6 mm)
1/2.9" (~ 4.96 x 3.72 mm)
Sensor resolution
4190 x 3150
3665 x 2756
Diagonal
6.00 mm
6.20 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 : 1.07
(ratio)
Nikon Coolpix S33 Nikon Coolpix S31
Surface area:
17.28 mm² vs 18.45 mm²
Difference: 1.17 mm² (7%)
S31 sensor is approx. 1.07x bigger than S33 sensor.
Note: You are comparing cameras of different generations. There is a 2 year gap between Nikon S33 (2015) and Nikon S31 (2013). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.15 µm
1.35 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: 0.2 µm (17%)
Pixel pitch of S31 is approx. 17% higher than pixel pitch of S33.
Pixel area
1.32 µm²
1.82 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: 0.5 µm² (38%)
A pixel on Nikon S31 sensor is approx. 38% bigger than a pixel on Nikon S33.
Pixel density
76.2 MP/cm²
54.6 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: 21.6 µm (40%)
Nikon S33 has approx. 40% higher pixel density than Nikon S31.
To learn about the accuracy of these numbers, click here.



Specs

Nikon S33
Nikon S31
Crop factor
7.21
6.98
Total megapixels
14.17
10.34
Effective megapixels
13.20
10.10
Optical zoom
3x
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 125-1600
Auto, 80, 100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
5 cm
30 cm
Macro focus range
5 cm
5 cm
Focal length (35mm equiv.)
30 - 90 mm
29 - 87 mm
Aperture priority
No
No
Max. aperture
f3.3 - f5.9
f3.3 - f5.9
Max. aperture (35mm equiv.)
f23.8 - f42.5
f23 - f41.2
Metering
Multi, Center-weighted, Spot
Matrix, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
4 sec
4 sec
Max. shutter speed
1/2000 sec
1/2000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
5
Screen size
2.7"
2.7"
Screen resolution
230,000 dots
230,000 dots
Video capture
Max. video resolution
1920x1080 (30p)
Storage types
SD/SDHC/SDXC
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Li-ion Battery EN-EL19
Rechargeable Li-ion Battery EN-EL12
Weight
180 g
185 g
Dimensions
109.5 x 67 x 37.6 mm
105.4 x 64.8 x 41.5 mm
Year
2015
2013




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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

Nikon S33 diagonal

The diagonal of S33 sensor is not 1/3 or 0.33" (8.5 mm) as you might expect, but approximately two thirds of that value - 6 mm. If you want to know why, see sensor sizes.

w = 4.80 mm
h = 3.60 mm
Diagonal =  4.80² + 3.60²   = 6.00 mm

Nikon S31 diagonal

The diagonal of S31 sensor is not 1/2.9 or 0.34" (8.8 mm) as you might expect, but approximately two thirds of that value - 6.2 mm. If you want to know why, see sensor sizes.

w = 4.96 mm
h = 3.72 mm
Diagonal =  4.96² + 3.72²   = 6.20 mm


Surface area

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

S33 sensor area

Width = 4.80 mm
Height = 3.60 mm

Surface area = 4.80 × 3.60 = 17.28 mm²

S31 sensor area

Width = 4.96 mm
Height = 3.72 mm

Surface area = 4.96 × 3.72 = 18.45 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

S33 pixel pitch

Sensor width = 4.80 mm
Sensor resolution width = 4190 pixels
Pixel pitch =   4.80  × 1000  = 1.15 µm
4190

S31 pixel pitch

Sensor width = 4.96 mm
Sensor resolution width = 3665 pixels
Pixel pitch =   4.96  × 1000  = 1.35 µm
3665


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

S33 pixel area

Pixel pitch = 1.15 µm

Pixel area = 1.15² = 1.32 µm²

S31 pixel area

Pixel pitch = 1.35 µm

Pixel area = 1.35² = 1.82 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

S33 pixel density

Sensor resolution width = 4190 pixels
Sensor width = 0.48 cm

Pixel density = (4190 / 0.48)² / 1000000 = 76.2 MP/cm²

S31 pixel density

Sensor resolution width = 3665 pixels
Sensor width = 0.496 cm

Pixel density = (3665 / 0.496)² / 1000000 = 54.6 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

S33 sensor resolution

Sensor width = 4.80 mm
Sensor height = 3.60 mm
Effective megapixels = 13.20
r = 4.80/3.60 = 1.33
X =  13.20 × 1000000  = 3150
1.33
Resolution horizontal: X × r = 3150 × 1.33 = 4190
Resolution vertical: X = 3150

Sensor resolution = 4190 x 3150

S31 sensor resolution

Sensor width = 4.96 mm
Sensor height = 3.72 mm
Effective megapixels = 10.10
r = 4.96/3.72 = 1.33
X =  10.10 × 1000000  = 2756
1.33
Resolution horizontal: X × r = 2756 × 1.33 = 3665
Resolution vertical: X = 2756

Sensor resolution = 3665 x 2756


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


S33 crop factor

Sensor diagonal in mm = 6.00 mm
Crop factor =   43.27  = 7.21
6.00

S31 crop factor

Sensor diagonal in mm = 6.20 mm
Crop factor =   43.27  = 6.98
6.20

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).

S33 equivalent aperture

Crop factor = 7.21
Aperture = f3.3 - f5.9

35-mm equivalent aperture = (f3.3 - f5.9) × 7.21 = f23.8 - f42.5

S31 equivalent aperture

Crop factor = 6.98
Aperture = f3.3 - f5.9

35-mm equivalent aperture = (f3.3 - f5.9) × 6.98 = f23 - f41.2

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