Sony Cyber-shot DSC-WX9 vs. Pentax MX-1

Comparison

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Cyber-shot DSC-WX9 image
vs
MX-1 image
Sony Cyber-shot DSC-WX9 Pentax MX-1
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Megapixels
16.20
12.00
Max. image resolution
4608 x 3456
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
4642 x 3490
4011 x 2993
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)
Sony Cyber-shot DSC-WX9 Pentax MX-1
Surface area:
28.46 mm² vs 42.47 mm²
Difference: 14.01 mm² (49%)
MX-1 sensor is approx. 1.49x bigger than WX9 sensor.
Note: You are comparing cameras of different generations. There is a 2 year gap between Sony WX9 (2011) and Pentax MX-1 (2013). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.33 µm
1.88 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: 0.55 µm (41%)
Pixel pitch of MX-1 is approx. 41% higher than pixel pitch of WX9.
Pixel area
1.77 µm²
3.53 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: 1.76 µm² (99%)
A pixel on Pentax MX-1 sensor is approx. 99% bigger than a pixel on Sony WX9.
Pixel density
56.79 MP/cm²
28.37 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: 28.42 µm (100%)
Sony WX9 has approx. 100% higher pixel density than Pentax MX-1.
To learn about the accuracy of these numbers, click here.



Specs

Sony WX9
Pentax MX-1
Crop factor
5.62
4.6
Total megapixels
12.76
Effective megapixels
12.00
Optical zoom
5x
4x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100, 200, 400, 800, 1600, 3200
Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800
RAW
Manual focus
Normal focus range
5 cm
60 cm
Macro focus range
5 cm
1 cm
Focal length (35mm equiv.)
25 - 125 mm
28 - 112 mm
Aperture priority
No
Yes
Max. aperture
f2.6 - f6.3
f1.8 - f2.5
Max. aperture (35mm equiv.)
f14.6 - f35.4
f8.3 - f11.5
Metering
Centre weighted, Multi-segment, Spot
Multi, Center-weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
Yes
Min. shutter speed
2 sec
30 sec
Max. shutter speed
1/1600 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
7
9
Screen size
3"
3"
Screen resolution
921,600 dots
920,000 dots
Video capture
Max. video resolution
Storage types
Memory Stick Duo, Memory Stick Pro Duo, SDHC, SDXC, Secure Digital
SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Lithium-Ion NP-BN1 battery
Lithium-Ion D-Li-106 rechargeable battery
Weight
123 g
391 g
Dimensions
94.6 x 56.3 x 19.8 mm
122 x 61 x 51 mm
Year
2011
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

Sony WX9 diagonal

The diagonal of WX9 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 MX-1 diagonal

The diagonal of MX-1 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.

WX9 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

MX-1 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

WX9 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4642 pixels
Pixel pitch =   6.16  × 1000  = 1.33 µm
4642

MX-1 pixel pitch

Sensor width = 7.53 mm
Sensor resolution width = 4011 pixels
Pixel pitch =   7.53  × 1000  = 1.88 µm
4011


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

WX9 pixel area

Pixel pitch = 1.33 µm

Pixel area = 1.33² = 1.77 µm²

MX-1 pixel area

Pixel pitch = 1.88 µm

Pixel area = 1.88² = 3.53 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

WX9 pixel density

Sensor resolution width = 4642 pixels
Sensor width = 0.616 cm

Pixel density = (4642 / 0.616)² / 1000000 = 56.79 MP/cm²

MX-1 pixel density

Sensor resolution width = 4011 pixels
Sensor width = 0.753 cm

Pixel density = (4011 / 0.753)² / 1000000 = 28.37 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

WX9 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 16.20
r = 6.16/4.62 = 1.33
X =  16.20 × 1000000  = 3490
1.33
Resolution horizontal: X × r = 3490 × 1.33 = 4642
Resolution vertical: X = 3490

Sensor resolution = 4642 x 3490

MX-1 sensor resolution

Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 12.00
r = 7.53/5.64 = 1.34
X =  12.00 × 1000000  = 2993
1.34
Resolution horizontal: X × r = 2993 × 1.34 = 4011
Resolution vertical: X = 2993

Sensor resolution = 4011 x 2993


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


WX9 crop factor

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

MX-1 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).

WX9 equivalent aperture

Crop factor = 5.62
Aperture = f2.6 - f6.3

35-mm equivalent aperture = (f2.6 - f6.3) × 5.62 = f14.6 - f35.4

MX-1 equivalent aperture

Crop factor = 4.6
Aperture = f1.8 - f2.5

35-mm equivalent aperture = (f1.8 - f2.5) × 4.6 = f8.3 - f11.5

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