Fujifilm FinePix J15 vs. Pentax Optio WG-3

Comparison

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Fujifilm FinePix J15

Pentax Optio WG-3

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Megapixels

8.20

16.00

Max. image resolution

3264 x 2448

4608 x 3456

Sensor

Sensor type

CCD

CMOS

Sensor size

1/2.5" (~ 5.75 x 4.32 mm)

1/2.3" (~ 6.16 x 4.62 mm)

Sensor resolution

3302 x 2483

4612 x 3468

Diagonal

7.19 mm

7.70 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	:	1.15
(ratio)

Fujifilm FinePix J15		Pentax Optio WG-3

Surface area:

24.84 mm²

28.46 mm²

Difference: 3.62 mm² (15%)

WG-3 sensor is approx. 1.15x bigger than J15 sensor.

Note: You are comparing cameras of different generations. There is a 5 year gap between Fujifilm J15 (2008) and Pentax WG-3 (2013). All things being equal, newer sensor generations generally outperform the older.

Pixel pitch

1.74 µm

1.34 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: 0.4 µm (30%)

Pixel pitch of J15 is approx. 30% higher than pixel pitch of WG-3.

Pixel area

3.03 µm²

1.8 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:

Pixel area difference: 1.23 µm² (68%)

A pixel on Fujifilm J15 sensor is approx. 68% bigger than a pixel on Pentax WG-3.

Pixel density

32.98 MP/cm²

56.06 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: 23.08 µm (70%)

Pentax WG-3 has approx. 70% higher pixel density than Fujifilm J15.

To learn about the accuracy of these numbers, click here.

Specs

Fujifilm J15

Pentax WG-3

Crop factor

6.02

5.62

Total megapixels

16.79

Effective megapixels

16.00

Optical zoom

Yes

Digital zoom

Yes

ISO sensitivity

Auto, 64, 100, 200, 400, 800, 1600

Auto 125-6400, 125, 200, 400,800, 1600, 3200, 6400

RAW

Manual focus

Normal focus range

40 cm

Macro focus range

15 cm

1 cm

Focal length (35mm equiv.)

35 - 113 mm

25 - 100 mm

Aperture priority

Max. aperture

f2.8 - f5.6

f2 - f4.9

Max. aperture (35mm equiv.)

f16.9 - f33.7

f11.2 - f27.5

Metering

TTL 256-zones metering

Multi, Center-weighted, Spot

Exposure compensation

±2 EV (in 1/3 EV, 1/2 EV steps)

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

8 sec

4 sec

Max. shutter speed

1/2000 sec

1/4000 sec

Built-in flash

External flash

Viewfinder

None

White balance presets

Screen size

2.5"

Screen resolution

153,000 dots

460,000 dots

Video capture

Max. video resolution

Storage types

SDHC, Secure Digital

SD/SDHC/SDXC

USB

USB 2.0 (480 Mbit/sec)

HDMI

Wireless

GPS

Battery

Li-Ion

Lithium-Ion D-LI92 rechargeable battery

Weight

162 g

230 g

Dimensions

91 x 55 x 19 mm

125 x 64 x 33 mm

Year

2008

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

Fujifilm J15 diagonal

The diagonal of J15 sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of that value - 7.19 mm. If you want to know why, see sensor sizes.

w = 5.75 mm
h = 4.32 mm

Diagonal = √

5.75² + 4.32²

= 7.19 mm

Pentax WG-3 diagonal

The diagonal of WG-3 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

Surface area

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

J15 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

WG-3 sensor 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

J15 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 3302 pixels

Pixel pitch =	5.75	× 1000	= 1.74 µm
	3302

WG-3 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4612 pixels

Pixel pitch =	6.16	× 1000	= 1.34 µm
	4612

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

J15 pixel area

Pixel pitch = 1.74 µm

Pixel area = 1.74² = 3.03 µm²

WG-3 pixel area

Pixel pitch = 1.34 µm

Pixel area = 1.34² = 1.8 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

J15 pixel density

Sensor resolution width = 3302 pixels
Sensor width = 0.575 cm

Pixel density = (3302 / 0.575)² / 1000000 = 32.98 MP/cm²

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

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

J15 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 8.20

r = 5.75/4.32 = 1.33

X = √	8.20 × 1000000	= 2483
	1.33

Resolution horizontal: X × r = 2483 × 1.33 = 3302
Resolution vertical: X = 2483

Sensor resolution = 3302 x 2483

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

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

J15 crop factor

Sensor diagonal in mm = 7.19 mm

Crop factor =	43.27	= 6.02
	7.19

WG-3 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).

J15 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5.6

35-mm equivalent aperture = (f2.8 - f5.6) × 6.02 = f16.9 - f33.7

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

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