Olympus C-750 UZ vs. Olympus C-765 UZ

Comparison

C-750 UZ image
vs.
C-765 UZ image

 

Olympus C-750 UZ Olympus C-765 UZ
Megapixels
3.90 3.90
Max. resolution
3200 x 2400 3200 x 2400
Price
Amazon, B&H Photo, Adorama Amazon, B&H Photo, Adorama

Sensor

Sensor type
CCD CCD
Sensor size
1/2.7" (~ 5.33 x 4 mm) 1/2.5" (~ 5.75 x 4.32 mm)
Sensor resolution
2277 x 1712  2277 x 1712 
Diagonal
6.66 mm  7.19 mm 
Surface area
21.32 mm²  24.84 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 C-750 UZ
vs.
Olympus C-765 UZ
 
Surface area:
Olympus C-750 UZ
Olympus C-765 UZ
Difference: 3.52 mm² (17%)
Olympus C-765 UZ has approx. 17% more surface area than Olympus C-750 UZ.
Pixel pitch
2.34 µm  2.53 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 C-750 UZ
Olympus C-765 UZ
Difference: 0.19 µm (8%)
Pixel pitch of Olympus C-765 UZ is approx. 8% higher than pixel pitch of Olympus C-750 UZ.
Pixel area
5.48 µm²  6.4 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 C-750 UZ
vs.
Olympus C-765 UZ
Pixel area difference: 0.92 µm² (17%)
A pixel on Olympus C-765 UZ sensor is approx. 17% bigger than a pixel on Olympus C-750 UZ.
Pixel density
18.25 MP/cm²  15.68 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 C-750 UZ
Olympus C-765 UZ
Difference: 2.57 MP/cm² (16%)
Olympus C-750 UZ has approx. 16% higher pixel density than Olympus C-765 UZ.
To learn about the accuracy of these numbers, click here.

Other specifications

Crop factor
6.5  6.02 
Total megapixels
4.10 4.10
Effective megapixels
3.90 3.90
Optical zoom
10x 10x
Digital zoom
Yes Yes
Iso
Auto, 100, 200, 400 50, 100, 200, 400
Auto focus
Yes Yes
Manual focus
Yes Yes
Normal focus range
50 cm 60 cm
Macro focus range
7 cm 3 cm
Focal length (35mm equiv.)
38 - 380 mm 38 - 380 mm
Aperture priority
Yes Yes
Aperture
f2.8 - f3.7 f2.8 - f3.7
Aperture (35mm equiv.)
f18.2 - f24.1  f16.9 - f22.3 
Metering
ESP Digital, Multi Spot, Spot ESP Digital, Multi Spot, Spot
Exposure compensation
-2EV - +2EV with 1/3EV steps -2EV - +2EV with 1/3EV steps
Shutter priority
Yes Yes
Min. shutter speed
16 sec 16 sec
Max. shutter speed
1/1000 sec 1/1000 sec
Flash modes
Anti red-eye, Auto, Fill in, Off, Slow flash Anti red-eye, Auto, Fill in, Off, Slow flash
Built-in flash
Yes Yes
External flash
Yes No
Viewfinder
Electronic Electronic
White balance presets
6 7
LCD display
Yes Yes
LCD size
1.5" 1.8"
LCD resolution
110,000 114,000
Min. image resolution
640 x 480 640 x 480
Selftimer
Yes Yes
Storage types
xD Picture card xD Picture card
USB
USB 1.0 (1.5 Mbit/sec) USB 1.0 (1.5 Mbit/sec)
Batteries
AA NiMH (4) batteries & charger (supplied) Lithium-Ion rechargeable
Weight
387g 280g
Dimensions
108x66x69 mm 104.5x60x68.5 mm
Year
2003 2004



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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 C-750 UZ diagonal

The diagonal of Olympus C-750 UZ image sensor is not 1/2.7 inch as you might expect, but approximately two thirds of that value. If you want to know why, see sensor sizes.

w = 5.33 mm
h = 4.00 mm
Diagonal =  5.33² + 4.00²   = 6.66 mm

Olympus C-765 UZ diagonal

The diagonal of Olympus C-765 UZ image sensor is not 1/2.5 inch as you might expect, but approximately two thirds of that value. 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


Surface area

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

Olympus C-750 UZ surface area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 mm²

Olympus C-765 UZ surface area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 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 C-750 UZ pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 2277 pixels
Pixel pitch =   5.33  × 1000  = 2.34 µm
2277

Olympus C-765 UZ pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2277 pixels
Pixel pitch =   5.75  × 1000  = 2.53 µm
2277


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 C-750 UZ pixel area

Pixel pitch = 2.34 µm

Pixel area = 2.34² = 5.48 µm²

Olympus C-765 UZ pixel area

Pixel pitch = 2.53 µm

Pixel area = 2.53² = 6.4 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 C-750 UZ pixel density

Sensor resolution width = 2277 pixels
Sensor width = 0.533 cm

Pixel density = (2277 / 0.533)² / 1000000 = 18.25 MP/cm²

Olympus C-765 UZ pixel density

Sensor resolution width = 2277 pixels
Sensor width = 0.575 cm

Pixel density = (2277 / 0.575)² / 1000000 = 15.68 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 C-750 UZ sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 3.90
r = 5.33/4.00 = 1.33
X =  3.90 × 1000000  = 1712
1.33
Resolution horizontal: X × r = 1712 × 1.33 = 2277
Resolution vertical: X = 1712

Sensor resolution = 2277 x 1712

Olympus C-765 UZ sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 3.90
r = 5.75/4.32 = 1.33
X =  3.90 × 1000000  = 1712
1.33
Resolution horizontal: X × r = 1712 × 1.33 = 2277
Resolution vertical: X = 1712

Sensor resolution = 2277 x 1712


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 C-750 UZ crop factor

Sensor diagonal in mm = 6.66 mm
Crop factor =   43.27  = 6.5
6.66

Olympus C-765 UZ crop factor

Sensor diagonal in mm = 7.19 mm
Crop factor =   43.27  = 6.02
7.19

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 C-750 UZ equivalent aperture

Crop factor = 6.5
Aperture = f2.8 - f3.7

35-mm equivalent aperture = (f2.8 - f3.7) × 6.5 = f18.2 - f24.1

Olympus C-765 UZ equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f3.7

35-mm equivalent aperture = (f2.8 - f3.7) × 6.02 = f16.9 - f22.3


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