HP Photosmart M447 vs. HP Photosmart M517

Comparison

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Photosmart M447 image
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Photosmart M517 image
HP Photosmart M447 HP Photosmart M517
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Megapixels
5.00
5.10
Max. image resolution
2592 x 1936
2690 x 1984

Sensor

Sensor type
CCD
CCD
Sensor size
1/2.5" (~ 5.75 x 4.32 mm)
1/2.5" (~ 5.75 x 4.32 mm)
Sensor resolution
2579 x 1939
2604 x 1958
Diagonal
7.19 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
(ratio)
HP Photosmart M447 HP Photosmart M517
Surface area:
24.84 mm² vs 24.84 mm²
Difference: 0 mm² (0%)
M447 and M517 sensors are the same size.
Note: You are comparing cameras of different generations. There is a 2 year gap between HP M447 (2007) and HP M517 (2005). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
2.23 µm
2.21 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: 0.02 µm (0.9%)
Pixel pitch of M447 is approx. 0.9% higher than pixel pitch of M517.
Pixel area
4.97 µm²
4.88 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: 0.09 µm² (2%)
A pixel on HP M447 sensor is approx. 2% bigger than a pixel on HP M517.
Pixel density
20.12 MP/cm²
20.51 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: 0.39 µm (2%)
HP M517 has approx. 2% higher pixel density than HP M447.
To learn about the accuracy of these numbers, click here.



Specs

HP M447
HP M517
Crop factor
6.02
6.02
Total megapixels
Effective megapixels
Optical zoom
Yes
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto
Auto, 100, 200, 400
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
10 cm
Focal length (35mm equiv.)
36 - 108 mm
Aperture priority
No
No
Max. aperture
f2.8 - f4.8
Max. aperture (35mm equiv.)
n/a
f16.9 - f28.9
Metering
Centre weighted
Exposure compensation
±2 EV (in 1/2 EV steps)
Shutter priority
No
No
Min. shutter speed
2 sec
Max. shutter speed
1/2000 sec
Built-in flash
External flash
Viewfinder
None
Optical (tunnel)
White balance presets
6
Screen size
2.4"
2"
Screen resolution
130,573 dots
Video capture
Max. video resolution
Storage types
Secure Digital
MultiMedia, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 1.0
HDMI
Wireless
GPS
Battery
2x AA
AA (2) batteries (NiMH recommended)
Weight
172 g
Dimensions
96.0 x 36.8 x 63.0 mm
109 x 52 x 36 mm
Year
2007
2005




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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

HP M447 diagonal

The diagonal of M447 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

HP M517 diagonal

The diagonal of M517 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.

M447 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

M517 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

M447 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2579 pixels
Pixel pitch =   5.75  × 1000  = 2.23 µm
2579

M517 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2604 pixels
Pixel pitch =   5.75  × 1000  = 2.21 µm
2604


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

M447 pixel area

Pixel pitch = 2.23 µm

Pixel area = 2.23² = 4.97 µm²

M517 pixel area

Pixel pitch = 2.21 µm

Pixel area = 2.21² = 4.88 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

M447 pixel density

Sensor resolution width = 2579 pixels
Sensor width = 0.575 cm

Pixel density = (2579 / 0.575)² / 1000000 = 20.12 MP/cm²

M517 pixel density

Sensor resolution width = 2604 pixels
Sensor width = 0.575 cm

Pixel density = (2604 / 0.575)² / 1000000 = 20.51 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

M447 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 5.00
r = 5.75/4.32 = 1.33
X =  5.00 × 1000000  = 1939
1.33
Resolution horizontal: X × r = 1939 × 1.33 = 2579
Resolution vertical: X = 1939

Sensor resolution = 2579 x 1939

M517 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 5.10
r = 5.75/4.32 = 1.33
X =  5.10 × 1000000  = 1958
1.33
Resolution horizontal: X × r = 1958 × 1.33 = 2604
Resolution vertical: X = 1958

Sensor resolution = 2604 x 1958


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


M447 crop factor

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

M517 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).

M447 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 HP M447, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for HP M447 is 6.02

M517 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f4.8

35-mm equivalent aperture = (f2.8 - f4.8) × 6.02 = f16.9 - f28.9

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