Canon PowerShot SD800 IS vs. Nikon D70s

Comparison

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PowerShot SD800 IS image
vs
D70s image
Canon PowerShot SD800 IS Nikon D70s
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Megapixels
7.10
6.10
Max. image resolution
3072 x 2304
3008 x 2000

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
23.7 x 15.6 mm
Sensor resolution
3072 x 2310
3045 x 2003
Diagonal
7.19 mm
28.37 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 : 14.88
(ratio)
Canon PowerShot SD800 IS Nikon D70s
Surface area:
24.84 mm² vs 369.72 mm²
Difference: 344.88 mm² (1388%)
D70s sensor is approx. 14.88x bigger than SD800 IS sensor.
Pixel pitch
1.87 µm
7.78 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: 5.91 µm (316%)
Pixel pitch of D70s is approx. 316% higher than pixel pitch of SD800 IS.
Pixel area
3.5 µm²
60.53 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: 57.03 µm² (1629%)
A pixel on Nikon D70s sensor is approx. 1629% bigger than a pixel on Canon SD800 IS.
Pixel density
28.54 MP/cm²
1.65 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: 26.89 µm (1630%)
Canon SD800 IS has approx. 1630% higher pixel density than Nikon D70s.
To learn about the accuracy of these numbers, click here.



Specs

Canon SD800 IS
Nikon D70s
Crop factor
6.02
1.53
Total megapixels
6.24
Effective megapixels
7.10
6.10
Optical zoom
3.8x
Digital zoom
Yes
No
ISO sensitivity
Auto, 80 ,100, 200, 400, 800, 1600
Auto, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600
RAW
Manual focus
Normal focus range
45 cm
Macro focus range
3 cm
Focal length (35mm equiv.)
28 - 105 mm
Aperture priority
No
Yes
Max. aperture
f2.8 - f5.8
Max. aperture (35mm equiv.)
f16.9 - f34.9
n/a
Metering
Multi, Center-weighted, Spot
3D Matrix, Centre weighted, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
No
Yes
Min. shutter speed
15 sec
Bulb+30 sec
Max. shutter speed
1/1600 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
Optical (pentamirror)
White balance presets
5
6
Screen size
2.5"
2"
Screen resolution
207,000 dots
130,000 dots
Video capture
Max. video resolution
Storage types
SD/SDHC/MMC card
CompactFlash type I, CompactFlash type II, Microdrive
USB
USB 2.0 (480 Mbit/sec)
USB 1.0
HDMI
Wireless
GPS
Battery
Lithium-Ion NB-5L battery
Nikon EN-EL3a Lithium-Ion included
Weight
195 g
679 g
Dimensions
90 x 58 x 25 mm
140 x 111 x 78 mm
Year
2006
2005




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vs

Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Canon SD800 IS diagonal

The diagonal of SD800 IS 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

Nikon D70s diagonal

w = 23.70 mm
h = 15.60 mm
Diagonal =  23.70² + 15.60²   = 28.37 mm


Surface area

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

SD800 IS sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

D70s sensor area

Width = 23.70 mm
Height = 15.60 mm

Surface area = 23.70 × 15.60 = 369.72 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

SD800 IS pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 3072 pixels
Pixel pitch =   5.75  × 1000  = 1.87 µm
3072

D70s pixel pitch

Sensor width = 23.70 mm
Sensor resolution width = 3045 pixels
Pixel pitch =   23.70  × 1000  = 7.78 µm
3045


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

SD800 IS pixel area

Pixel pitch = 1.87 µm

Pixel area = 1.87² = 3.5 µm²

D70s pixel area

Pixel pitch = 7.78 µm

Pixel area = 7.78² = 60.53 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

SD800 IS pixel density

Sensor resolution width = 3072 pixels
Sensor width = 0.575 cm

Pixel density = (3072 / 0.575)² / 1000000 = 28.54 MP/cm²

D70s pixel density

Sensor resolution width = 3045 pixels
Sensor width = 2.37 cm

Pixel density = (3045 / 2.37)² / 1000000 = 1.65 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

SD800 IS sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 7.10
r = 5.75/4.32 = 1.33
X =  7.10 × 1000000  = 2310
1.33
Resolution horizontal: X × r = 2310 × 1.33 = 3072
Resolution vertical: X = 2310

Sensor resolution = 3072 x 2310

D70s sensor resolution

Sensor width = 23.70 mm
Sensor height = 15.60 mm
Effective megapixels = 6.10
r = 23.70/15.60 = 1.52
X =  6.10 × 1000000  = 2003
1.52
Resolution horizontal: X × r = 2003 × 1.52 = 3045
Resolution vertical: X = 2003

Sensor resolution = 3045 x 2003


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


SD800 IS crop factor

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

D70s crop factor

Sensor diagonal in mm = 28.37 mm
Crop factor =   43.27  = 1.53
28.37

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).

SD800 IS equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5.8

35-mm equivalent aperture = (f2.8 - f5.8) × 6.02 = f16.9 - f34.9

D70s 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 Nikon D70s, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Nikon D70s is 1.53

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