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

Comparison

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

Comparison

Olympus Stylus SP-820UZ Olympus SP-720UZ
Megapixels
14.00 14.40
Max. resolution
4288 x 3216 4288 x 3216
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

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 
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:
Olympus Stylus SP-820UZ
vs.
Olympus SP-720UZ
 
Surface area:
Olympus Stylus SP-820UZ
Olympus SP-720UZ
Difference: 0 mm² (0%)
Olympus Stylus SP-820UZ and Olympus SP-720UZ have the same surface area.
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.
Pixel pitch
Olympus Stylus SP-820UZ
Olympus SP-720UZ
Difference: 0.02 µm (1%)
Pixel pitch of Olympus Stylus SP-820UZ is approx. 1% higher than pixel pitch of Olympus 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:
Olympus Stylus SP-820UZ
vs.
Olympus SP-720UZ
Pixel area difference: 0.05 µm² (3%)
A pixel on Olympus Stylus 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.
Pixel density
Olympus Stylus SP-820UZ
Olympus SP-720UZ
Difference: 1.4 MP/cm² (3%)
Olympus SP-720UZ has approx. 3% higher pixel density than Olympus Stylus SP-820UZ.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
5.62  5.62 
Total megapixels
14.50 n/a
Effective megapixels
14.00 n/a
Optical zoom
40x Yes
Digital zoom
Yes Yes
Iso
Auto, High Auto, 80, 100, 200, 400, 800, 1600, 3200, 6400 Auto, 100, 200, 400, 800, 1600, 3200
Auto focus
Yes Yes
Manual focus
No No
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
Aperture
f3.4 - f5.7 f3.2 - f5.6
Aperture (35mm equiv.)
f19.1 - f32  f18 - f31.5 
Metering
MultiSpot, AF-area ESP Digital
Exposure compensation
±2 EV (at 1/3 EV steps) -2EV - +2EV with 1/3EV steps
Shutter priority
No No
Min. shutter speed
4 sec n/a
Max. shutter speed
1/2000 sec n/a
Flash modes
Auto, On, Off, Red-Eye, Fill-in Anti red-eye, Auto, Fill in, Off, Slow flash
Built-in flash
Yes Yes
External flash
No No
Viewfinder
None None
White balance presets
6 7
LCD display
Yes Yes
LCD size
3" n/a
LCD resolution
460,000 460,000
Min. image resolution
640 x 480 640 x 480
Selftimer
Yes Yes
Storage types
SD/SDHC/SDXC SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec) USB 2.0 Hi-Speed
Batteries
n/a Li-Ion
Weight
485g 405g
Dimensions
n/a 107.4x72.6x73.2 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 Stylus SP-820UZ diagonal

The diagonal of Olympus Stylus SP-820UZ 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

Olympus SP-720UZ diagonal

The diagonal of Olympus SP-720UZ 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.

Olympus Stylus SP-820UZ surface area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

Olympus SP-720UZ 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

Olympus Stylus SP-820UZ pixel pitch

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

Olympus 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

Olympus Stylus SP-820UZ pixel area

Pixel pitch = 1.43 µm

Pixel area = 1.43² = 2.04 µm²

Olympus 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

You could also use this formula:
Pixel density =   effective megapixels × 1000000  / 10000
sensor surface area in mm²

Olympus Stylus 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

Olympus 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. 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

Olympus Stylus 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

Olympus 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


Olympus Stylus SP-820UZ crop factor

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

Olympus 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).

Olympus Stylus 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

Olympus 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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