Pentax WG-3 vs. Pentax WG-10

Comparison

WG-3 image
vs.
WG-10 image

Comparison

Pentax WG-3 Pentax WG-10
Megapixels
16.00 14.00
Max. resolution
4608 x 3456 4288 x 3216
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
BSI CMOS CCD
Sensor size
1/2.3" (~ 6.16 x 4.62 mm) 1/2.3" (~ 6.16 x 4.62 mm)
Sensor resolution
4612 x 3468  4315 x 3244 
Diagonal
7.70 mm  7.70 mm 
Surface area
28.46 mm²  28.46 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:
Pentax WG-3
vs.
Pentax WG-10
 
Surface area:
Pentax WG-3
Pentax WG-10
Difference: 0 mm² (0%)
Pentax WG-3 and Pentax WG-10 have the same surface area.
Pixel pitch
1.34 µm  1.43 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
Pentax WG-3
Pentax WG-10
Difference: 0.09 µm (7%)
Pixel pitch of Pentax WG-10 is approx. 7% higher than pixel pitch of Pentax WG-3.
Pixel area
1.8 µm²  2.04 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:
Pentax WG-3
vs.
Pentax WG-10
Pixel area difference: 0.24 µm² (13%)
A pixel on Pentax WG-10 sensor is approx. 13% bigger than a pixel on Pentax WG-3.
Pixel density
56.06 MP/cm²  49.07 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
Pentax WG-3
Pentax WG-10
Difference: 6.99 MP/cm² (14%)
Pentax WG-3 has approx. 14% higher pixel density than Pentax WG-10.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
5.62  5.62 
Total megapixels
16.79 14.48
Effective megapixels
16.00 14.00
Optical zoom
4x 5x
Digital zoom
Yes Yes
Iso
Auto 125-6400, 125, 200, 400,800, 1600, 3200, 6400 Auto 125-6400, 125, 200, 400,800, 1600, 3200, 6400
Auto focus
Yes Yes
Manual focus
Yes Yes
Normal focus range
40 cm 50 cm
Macro focus range
1 cm 1 cm
Focal length (35mm equiv.)
25 - 100 mm 28 -€“ 140 mm
Aperture priority
No No
Aperture
f2 - f4.9 f3.5 - f5.5
Aperture (35mm equiv.)
f11.2 - f27.5  f19.7 - f30.9 
Metering
Multi, Center-weighted, Spot Multi, Center-weighted, Spot
Exposure compensation
±2 EV (at 1/3 EV steps) ±2 EV (at 1/3 EV steps)
Shutter priority
No No
Min. shutter speed
4 sec 4 sec
Max. shutter speed
1/4000 sec 1/5000 sec
Flash modes
Auto, On, Off, Red-eye, Soft Auto, On, Off, Red-eye, Soft
Built-in flash
Yes Yes
External flash
No No
Viewfinder
None None
White balance presets
4 4
LCD display
Yes Yes
LCD size
3" 2.7"
LCD resolution
460,000 230,000
Min. image resolution
640 x 480 640 x 480
Selftimer
Yes Yes
Storage types
SD/SDHC/SDXC SD/SDHC/SDXC
USB
USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
Batteries
Lithium-Ion D-LI92 rechargeable battery & charger Lithium-Ion D-LI92 rechargeable battery & charger
Weight
230 g 167 g
Dimensions
125 x 64 x 33 mm 114 x 59 x 28 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

Pentax WG-3 diagonal

The diagonal of Pentax WG-3 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

Pentax WG-10 diagonal

The diagonal of Pentax WG-10 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


Surface area

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

Pentax WG-3 surface area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

Pentax WG-10 surface area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 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

Pentax WG-3 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4612 pixels
Pixel pitch =   6.16  × 1000  = 1.34 µm
4612

Pentax WG-10 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4315 pixels
Pixel pitch =   6.16  × 1000  = 1.43 µm
4315


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

Pentax WG-3 pixel area

Pixel pitch = 1.34 µm

Pixel area = 1.34² = 1.8 µm²

Pentax WG-10 pixel area

Pixel pitch = 1.43 µm

Pixel area = 1.43² = 2.04 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

Pentax WG-3 pixel density

Sensor resolution width = 4612 pixels
Sensor width = 0.616 cm

Pixel density = (4612 / 0.616)² / 1000000 = 56.06 MP/cm²

Pentax WG-10 pixel density

Sensor resolution width = 4315 pixels
Sensor width = 0.616 cm

Pixel density = (4315 / 0.616)² / 1000000 = 49.07 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

Pentax WG-3 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 16.00
r = 6.16/4.62 = 1.33
X =  16.00 × 1000000  = 3468
1.33
Resolution horizontal: X × r = 3468 × 1.33 = 4612
Resolution vertical: X = 3468

Sensor resolution = 4612 x 3468

Pentax WG-10 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 14.00
r = 6.16/4.62 = 1.33
X =  14.00 × 1000000  = 3244
1.33
Resolution horizontal: X × r = 3244 × 1.33 = 4315
Resolution vertical: X = 3244

Sensor resolution = 4315 x 3244


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


Pentax WG-3 crop factor

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

Pentax WG-10 crop factor

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

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).

Pentax WG-3 equivalent aperture

Crop factor = 5.62
Aperture = f2 - f4.9

35-mm equivalent aperture = (f2 - f4.9) × 5.62 = f11.2 - f27.5

Pentax WG-10 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


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