Casio Exilim EX-TR15 vs. Samsung NX mini

Comparison

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Exilim EX-TR15 image
vs
NX mini image
Casio Exilim EX-TR15 Samsung NX mini
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Megapixels
12.10
20.50
Max. image resolution
4000 x 3000
5472 x 3648

Sensor

Sensor type
CMOS
CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
13.2 x 8.8 mm
Sensor resolution
4011 x 3016
5546 x 3697
Diagonal
7.70 mm
15.86 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 : 4.08
(ratio)
Casio Exilim EX-TR15 Samsung NX mini
Surface area:
28.46 mm² vs 116.16 mm²
Difference: 87.7 mm² (308%)
NX mini sensor is approx. 4.08x bigger than TR15 sensor.
Pixel pitch
1.54 µm
2.38 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: 0.84 µm (55%)
Pixel pitch of NX mini is approx. 55% higher than pixel pitch of TR15.
Pixel area
2.37 µm²
5.66 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: 3.29 µm² (139%)
A pixel on Samsung NX mini sensor is approx. 139% bigger than a pixel on Casio TR15.
Pixel density
42.4 MP/cm²
17.65 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: 24.75 µm (140%)
Casio TR15 has approx. 140% higher pixel density than Samsung NX mini.
To learn about the accuracy of these numbers, click here.



Specs

Casio TR15
Samsung NX mini
Crop factor
5.62
2.73
Total megapixels
12.76
Effective megapixels
12.10
20.50
Optical zoom
1x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400, 800, 1600, 3200
Auto, 160, 200, 400, 800, 1600, 3200, 6400, 12800 (extends to 100-25600)
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
8 cm
Focal length (35mm equiv.)
21 mm
Aperture priority
No
Yes
Max. aperture
f2.8
Max. aperture (35mm equiv.)
f15.7
n/a
Metering
Multi
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 sec
30 sec
Max. shutter speed
1/16000 sec
1/16000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
6
7
Screen size
3"
3"
Screen resolution
921,600 dots
460,800 dots
Video capture
Max. video resolution
1920x1080 (30p)
Storage types
SD/SDHC/SDXC
microSD/microSDHC/microSDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Rechargeable lithium ion battery NP-150
B740AU
Weight
170 g
196 g
Dimensions
128.9 x 61.6 x 14.9 mm
110 x 62 x 23 mm
Year
2013
2014




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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

Casio TR15 diagonal

The diagonal of TR15 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

Samsung NX mini diagonal

w = 13.20 mm
h = 8.80 mm
Diagonal =  13.20² + 8.80²   = 15.86 mm


Surface area

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

TR15 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

NX mini sensor area

Width = 13.20 mm
Height = 8.80 mm

Surface area = 13.20 × 8.80 = 116.16 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

TR15 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4011 pixels
Pixel pitch =   6.16  × 1000  = 1.54 µm
4011

NX mini pixel pitch

Sensor width = 13.20 mm
Sensor resolution width = 5546 pixels
Pixel pitch =   13.20  × 1000  = 2.38 µm
5546


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

TR15 pixel area

Pixel pitch = 1.54 µm

Pixel area = 1.54² = 2.37 µm²

NX mini pixel area

Pixel pitch = 2.38 µm

Pixel area = 2.38² = 5.66 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

TR15 pixel density

Sensor resolution width = 4011 pixels
Sensor width = 0.616 cm

Pixel density = (4011 / 0.616)² / 1000000 = 42.4 MP/cm²

NX mini pixel density

Sensor resolution width = 5546 pixels
Sensor width = 1.32 cm

Pixel density = (5546 / 1.32)² / 1000000 = 17.65 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

TR15 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 12.10
r = 6.16/4.62 = 1.33
X =  12.10 × 1000000  = 3016
1.33
Resolution horizontal: X × r = 3016 × 1.33 = 4011
Resolution vertical: X = 3016

Sensor resolution = 4011 x 3016

NX mini sensor resolution

Sensor width = 13.20 mm
Sensor height = 8.80 mm
Effective megapixels = 20.50
r = 13.20/8.80 = 1.5
X =  20.50 × 1000000  = 3697
1.5
Resolution horizontal: X × r = 3697 × 1.5 = 5546
Resolution vertical: X = 3697

Sensor resolution = 5546 x 3697


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


TR15 crop factor

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

NX mini crop factor

Sensor diagonal in mm = 15.86 mm
Crop factor =   43.27  = 2.73
15.86

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).

TR15 equivalent aperture

Crop factor = 5.62
Aperture = f2.8

35-mm equivalent aperture = (f2.8) × 5.62 = f15.7

NX mini 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 Samsung NX mini, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Samsung NX mini is 2.73

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