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

Comparison

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C-750 UZ image
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C-765 UZ image
Olympus C-750 UZ Olympus C-765 UZ
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Megapixels
3.90
3.90
Max. image resolution
3200 x 2400
3200 x 2400

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
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 : 1.17
(ratio)
Olympus C-750 UZ Olympus C-765 UZ
Surface area:
21.32 mm² vs 24.84 mm²
Difference: 3.52 mm² (17%)
C-765 UZ sensor is approx. 1.17x bigger than C-750 UZ sensor.
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.
Difference: 0.19 µm (8%)
Pixel pitch of C-765 UZ is approx. 8% higher than pixel pitch of 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:
vs
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.
Difference: 2.57 µm (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.

Specs

Olympus C-750 UZ
Olympus C-765 UZ
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 sensitivity
Auto, 100, 200, 400
50, 100, 200, 400
RAW
Manual focus
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
Max. aperture
f2.8 - f3.7
f2.8 - f3.7
Max. aperture (35mm equiv.)
f18.2 - f24.1
f16.9 - f22.3
Metering
ESP Digital, Multi Spot, Spot
ESP Digital, Multi Spot, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
16 sec
16 sec
Max. shutter speed
1/1000 sec
1/1000 sec
Built-in flash
External flash
Viewfinder
Electronic
Electronic
White balance presets
6
7
Screen size
1.5"
1.8"
Screen resolution
110,000 dots
114,000 dots
Video capture
Max. video resolution
Storage types
xD Picture card
xD Picture card
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
AA NiMH (4) batteries (supplied)
Lithium-Ion rechargeable
Weight
387 g
280 g
Dimensions
108 x 66 x 69 mm
104.5 x 60 x 68.5 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 C-750 UZ sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of that value - 6.66 mm. 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 C-765 UZ 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


Surface area

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

C-750 UZ sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 mm²

C-765 UZ sensor 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

C-750 UZ pixel pitch

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

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

C-750 UZ pixel area

Pixel pitch = 2.34 µm

Pixel area = 2.34² = 5.48 µm²

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

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

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

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.

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

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

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


C-750 UZ crop factor

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

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).

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

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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