Olympus C-820L vs. Contax N Digital

Comparison

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C-820L image
vs
N Digital image
Olympus C-820L Contax N Digital
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Megapixels
0.81
6.00
Max. image resolution
1024 x 768
3008 x 2008

Sensor

Sensor type
CCD
CCD
Sensor size
1/3" (~ 4.8 x 3.6 mm)
36 x 24 mm
Sensor resolution
1037 x 780
3000 x 2000
Diagonal
6.00 mm
43.27 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 : 50
(ratio)
Olympus C-820L Contax N Digital
Surface area:
17.28 mm² vs 864.00 mm²
Difference: 846.72 mm² (4900%)
N sensor is approx. 50x bigger than C-820L sensor.
Note: You are comparing cameras of different generations. There is a 3 year gap between Olympus C-820L (1997) and Contax N (2000). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
4.63 µm
12 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: 7.37 µm (159%)
Pixel pitch of N is approx. 159% higher than pixel pitch of C-820L.
Pixel area
21.44 µm²
144 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: 122.56 µm² (572%)
A pixel on Contax N sensor is approx. 572% bigger than a pixel on Olympus C-820L.
Pixel density
4.67 MP/cm²
0.69 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: 3.98 µm (577%)
Olympus C-820L has approx. 577% higher pixel density than Contax N .
To learn about the accuracy of these numbers, click here.



Specs

Olympus C-820L
Contax N
Crop factor
7.21
1
Total megapixels
6.29
Effective megapixels
6.00
Optical zoom
No
Digital zoom
Yes
No
ISO sensitivity
100
100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
70 cm
Macro focus range
20 cm
Focal length (35mm equiv.)
36 mm
Aperture priority
No
Yes
Max. aperture
f2.8
Max. aperture (35mm equiv.)
f20.2
n/a
Metering
Centre weighted
Centre weighted, Matrix, Spot
Exposure compensation
±1.5 EV (in 1/2 EV steps)
±2 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1/4 sec
32 sec
Max. shutter speed
1/500 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
Optical
Optical (pentaprism)
White balance presets
5
6
Screen size
1.8"
2"
Screen resolution
200,000 dots
Video capture
Max. video resolution
Storage types
SmartMedia
CompactFlash type I, CompactFlash type II, Microdrive
USB
USB 1.0
HDMI
Wireless
GPS
Battery
4x AA
Lithium-Ion rechargeable
Weight
340 g
1000 g
Dimensions
128 x 65 x 45 mm
152 x 138 x 79.5 mm
Year
1997
2000




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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-820L diagonal

The diagonal of C-820L sensor is not 1/3 or 0.33" (8.5 mm) as you might expect, but approximately two thirds of that value - 6 mm. If you want to know why, see sensor sizes.

w = 4.80 mm
h = 3.60 mm
Diagonal =  4.80² + 3.60²   = 6.00 mm

Contax N diagonal

w = 36.00 mm
h = 24.00 mm
Diagonal =  36.00² + 24.00²   = 43.27 mm


Surface area

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

C-820L sensor area

Width = 4.80 mm
Height = 3.60 mm

Surface area = 4.80 × 3.60 = 17.28 mm²

N sensor area

Width = 36.00 mm
Height = 24.00 mm

Surface area = 36.00 × 24.00 = 864.00 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-820L pixel pitch

Sensor width = 4.80 mm
Sensor resolution width = 1037 pixels
Pixel pitch =   4.80  × 1000  = 4.63 µm
1037

N pixel pitch

Sensor width = 36.00 mm
Sensor resolution width = 3000 pixels
Pixel pitch =   36.00  × 1000  = 12 µm
3000


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-820L pixel area

Pixel pitch = 4.63 µm

Pixel area = 4.63² = 21.44 µm²

N pixel area

Pixel pitch = 12 µm

Pixel area = 12² = 144 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-820L pixel density

Sensor resolution width = 1037 pixels
Sensor width = 0.48 cm

Pixel density = (1037 / 0.48)² / 1000000 = 4.67 MP/cm²

N pixel density

Sensor resolution width = 3000 pixels
Sensor width = 3.6 cm

Pixel density = (3000 / 3.6)² / 1000000 = 0.69 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-820L sensor resolution

Sensor width = 4.80 mm
Sensor height = 3.60 mm
Effective megapixels = 0.81
r = 4.80/3.60 = 1.33
X =  0.81 × 1000000  = 780
1.33
Resolution horizontal: X × r = 780 × 1.33 = 1037
Resolution vertical: X = 780

Sensor resolution = 1037 x 780

N sensor resolution

Sensor width = 36.00 mm
Sensor height = 24.00 mm
Effective megapixels = 6.00
r = 36.00/24.00 = 1.5
X =  6.00 × 1000000  = 2000
1.5
Resolution horizontal: X × r = 2000 × 1.5 = 3000
Resolution vertical: X = 2000

Sensor resolution = 3000 x 2000


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-820L crop factor

Sensor diagonal in mm = 6.00 mm
Crop factor =   43.27  = 7.21
6.00

N crop factor

Sensor diagonal in mm = 43.27 mm
Crop factor =   43.27  = 1
43.27

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-820L equivalent aperture

Crop factor = 7.21
Aperture = f2.8

35-mm equivalent aperture = (f2.8) × 7.21 = f20.2

N equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Contax N , take the aperture of the lens you're using and multiply it with crop factor.

Since crop factor for Contax N is 1, the equivalent aperture is aperture.

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