Olympus Stylus SP-820UZ vs. Olympus SP-720UZ

Comparison

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Stylus SP-820UZ image
vs
SP-720UZ image
Olympus Stylus SP-820UZ Olympus SP-720UZ
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Megapixels
14.00
14.40
Max. image resolution
4288 x 3216
4288 x 3216

Sensor

Sensor type
CMOS
CMOS
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/2.3" (~ 6.16 x 4.62 mm)
Sensor resolution
4315 x 3244
4376 x 3290
Diagonal
7.70 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 »
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1 : 1
(ratio)
Olympus Stylus SP-820UZ Olympus SP-720UZ
Surface area:
28.46 mm² vs 28.46 mm²
Difference: 0 mm² (0%)
SP-820UZ and SP-720UZ sensors are the same size.
Pixel pitch
1.43 µm
1.41 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: 0.02 µm (1%)
Pixel pitch of SP-820UZ is approx. 1% higher than pixel pitch of SP-720UZ.
Pixel area
2.04 µm²
1.99 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: 0.05 µm² (3%)
A pixel on Olympus SP-820UZ sensor is approx. 3% bigger than a pixel on Olympus SP-720UZ.
Pixel density
49.07 MP/cm²
50.47 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: 1.4 µm (3%)
Olympus SP-720UZ has approx. 3% higher pixel density than Olympus SP-820UZ.
To learn about the accuracy of these numbers, click here.

Specs

Olympus SP-820UZ
Olympus SP-720UZ
Crop factor
5.62
5.62
Total megapixels
14.50
Effective megapixels
14.00
Optical zoom
40x
Yes
Digital zoom
Yes
Yes
ISO sensitivity
Auto, High Auto, 80, 100, 200, 400, 800, 1600, 3200, 6400
Auto, 100, 200, 400, 800, 1600, 3200
RAW
Manual focus
Normal focus range
30 cm
30 cm
Macro focus range
1 cm
5 cm
Focal length (35mm equiv.)
22.4 - 896 mm
26 - 676 mm
Aperture priority
No
No
Max. aperture
f3.4 - f5.7
f3.2 - f5.6
Max. aperture (35mm equiv.)
f19.1 - f32
f18 - f31.5
Metering
MultiSpot, AF-area
ESP Digital
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
4 sec
Max. shutter speed
1/2000 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
6
7
Screen size
3"
Screen resolution
460,000 dots
460,000 dots
Video capture
Max. video resolution
Storage types
SD/SDHC/SDXC
SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Li-Ion
Weight
485 g
405 g
Dimensions
107.4 x 72.6 x 73.2 mm
Year
2012
2012



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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

Olympus SP-820UZ diagonal

The diagonal of SP-820UZ 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

Olympus SP-720UZ diagonal

The diagonal of SP-720UZ 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.

SP-820UZ sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

SP-720UZ 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

SP-820UZ pixel pitch

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

SP-720UZ pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4376 pixels
Pixel pitch =   6.16  × 1000  = 1.41 µm
4376


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

SP-820UZ pixel area

Pixel pitch = 1.43 µm

Pixel area = 1.43² = 2.04 µm²

SP-720UZ pixel area

Pixel pitch = 1.41 µm

Pixel area = 1.41² = 1.99 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

SP-820UZ pixel density

Sensor resolution width = 4315 pixels
Sensor width = 0.616 cm

Pixel density = (4315 / 0.616)² / 1000000 = 49.07 MP/cm²

SP-720UZ pixel density

Sensor resolution width = 4376 pixels
Sensor width = 0.616 cm

Pixel density = (4376 / 0.616)² / 1000000 = 50.47 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

SP-820UZ 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

SP-720UZ sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 14.40
r = 6.16/4.62 = 1.33
X =  14.40 × 1000000  = 3290
1.33
Resolution horizontal: X × r = 3290 × 1.33 = 4376
Resolution vertical: X = 3290

Sensor resolution = 4376 x 3290


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


SP-820UZ crop factor

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

SP-720UZ 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).

SP-820UZ equivalent aperture

Crop factor = 5.62
Aperture = f3.4 - f5.7

35-mm equivalent aperture = (f3.4 - f5.7) × 5.62 = f19.1 - f32

SP-720UZ equivalent aperture

Crop factor = 5.62
Aperture = f3.2 - f5.6

35-mm equivalent aperture = (f3.2 - f5.6) × 5.62 = f18 - f31.5

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