Kodak PixPro AZ251 vs. Sony Cybershot DSC RX100 II

Comparison

PixPro AZ251 image
vs.
Cybershot DSC RX100 II image

 

Kodak PixPro AZ251 Sony Cybershot DSC RX100 II
Megapixels
16.15 20.20
Max. resolution
4608 x 3456 5472 x 3648
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
CCD CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm) 13.2 x 8.8 mm
Sensor resolution
4635 x 3485  5505 x 3670 
Diagonal
7.70 mm  15.86 mm 
Surface area
28.46 mm²  116.16 mm² 
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 sizes:
Kodak PixPro AZ251
vs.
Sony Cybershot DSC RX100 II
 
Surface area:
Kodak PixPro AZ251
Sony Cybershot DSC RX100 II
Difference: 87.7 mm² (308%)
Sony Cybershot DSC RX100 II has approx. 308% more surface area than Kodak PixPro AZ251.
Pixel pitch
1.33 µm  2.4 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.
Pixel pitch
Kodak PixPro AZ251
Sony Cybershot DSC RX100 II
Difference: 1.07 µm (80%)
Pixel pitch of Sony Cybershot DSC RX100 II is approx. 80% higher than pixel pitch of Kodak PixPro AZ251.
Pixel area
1.77 µm²  5.76 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:
Kodak PixPro AZ251
vs.
Sony Cybershot DSC RX100 II
Pixel area difference: 3.99 µm² (225%)
A pixel on Sony Cybershot DSC RX100 II sensor is approx. 225% bigger than a pixel on Kodak PixPro AZ251.
Pixel density
56.62 MP/cm²  17.39 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.
Pixel density
Kodak PixPro AZ251
Sony Cybershot DSC RX100 II
Difference: 39.23 MP/cm² (226%)
Kodak PixPro AZ251 has approx. 226% higher pixel density than Sony Cybershot DSC RX100 II.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
5.62  2.73 
Total megapixels
16.44 20.90
Effective megapixels
16.15 20.20
Optical zoom
25x 3.6x
Digital zoom
Yes Yes
Iso
Auto, 80, 100, 200, 400, 1600, 3200 Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600
Auto focus
Yes Yes
Manual focus
n/a Yes
Normal focus range
60 cm n/a
Macro focus range
3 cm 5 cm
Focal length (35mm equiv.)
24 - 600 mm 28 - 100 mm
Aperture priority
Yes Yes
Aperture
f3.7 - f6.2 f1.8 - f4.9
Aperture (35mm equiv.)
f20.8 - f34.8  f4.9 - f13.4 
Metering
Multi, Center-weighted, Spot Multi, Center-weighted, Spot
Exposure compensation
± 2 EV in steps of 1/3 ±3 (at 1/3 EV steps)
Shutter priority
Yes Yes
Min. shutter speed
30 sec 30 sec
Max. shutter speed
1/2000 sec 1/2000 sec
Flash modes
Auto, Red-Eye Reduction, Forced Flash, Slow Synchro Auto, On, Off, Slow Sync
Built-in flash
Yes Yes
External flash
n/a Yes
Viewfinder
None Electronic (optional)
White balance presets
6 9
LCD display
Yes Yes
LCD size
3 3"
LCD resolution
230,000 1,229,000
Min. image resolution
640 x 480 2592 x 1944
Selftimer
Yes Yes
Storage types
SD/SDHC SD/SDHC/SDXC, Memory Stick Duo/Pro Duo/Pro-HG Duo
USB
USB 2.0 USB 2.0 (480 Mbit/sec)
Batteries
4 x AA Alkaline or NiMH batteries Lithium-Ion NP-BX1 battery and charger
Weight
354 g 281 g
Dimensions
115 x 74.3 x 69 mm 101.6 x 58.1 x 38.3 mm
Year
2013 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

Kodak PixPro AZ251 diagonal

The diagonal of Kodak PixPro AZ251 image sensor is not 1/2.3 inch as you might expect, but approximately two thirds of that value. 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

Sony Cybershot DSC RX100 II 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.

Kodak PixPro AZ251 surface area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

Sony Cybershot DSC RX100 II surface 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

Kodak PixPro AZ251 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4635 pixels
Pixel pitch =   6.16  × 1000  = 1.33 µm
4635

Sony Cybershot DSC RX100 II pixel pitch

Sensor width = 13.20 mm
Sensor resolution width = 5505 pixels
Pixel pitch =   13.20  × 1000  = 2.4 µm
5505


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

Kodak PixPro AZ251 pixel area

Pixel pitch = 1.33 µm

Pixel area = 1.33² = 1.77 µm²

Sony Cybershot DSC RX100 II pixel area

Pixel pitch = 2.4 µm

Pixel area = 2.4² = 5.76 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

Kodak PixPro AZ251 pixel density

Sensor resolution width = 4635 pixels
Sensor width = 0.616 cm

Pixel density = (4635 / 0.616)² / 1000000 = 56.62 MP/cm²

Sony Cybershot DSC RX100 II pixel density

Sensor resolution width = 5505 pixels
Sensor width = 1.32 cm

Pixel density = (5505 / 1.32)² / 1000000 = 17.39 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. 22.8 × 15.5 sensor for example has a ratio of 1.47.

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

Kodak PixPro AZ251 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 16.15
r = 6.16/4.62 = 1.33
X =  16.15 × 1000000  = 3485
1.33
Resolution horizontal: X × r = 3485 × 1.33 = 4635
Resolution vertical: X = 3485

Sensor resolution = 4635 x 3485

Sony Cybershot DSC RX100 II sensor resolution

Sensor width = 13.20 mm
Sensor height = 8.80 mm
Effective megapixels = 20.20
r = 13.20/8.80 = 1.5
X =  20.20 × 1000000  = 3670
1.5
Resolution horizontal: X × r = 3670 × 1.5 = 5505
Resolution vertical: X = 3670

Sensor resolution = 5505 x 3670


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


Kodak PixPro AZ251 crop factor

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

Sony Cybershot DSC RX100 II 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).

Kodak PixPro AZ251 equivalent aperture

Crop factor = 5.62
Aperture = f3.7 - f6.2

35-mm equivalent aperture = (f3.7 - f6.2) × 5.62 = f20.8 - f34.8

Sony Cybershot DSC RX100 II equivalent aperture

Crop factor = 2.73
Aperture = f1.8 - f4.9

35-mm equivalent aperture = (f1.8 - f4.9) × 2.73 = f4.9 - f13.4


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