HP Photosmart 715 vs. HP Photosmart 720

Comparison

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HP Photosmart 715

HP Photosmart 720

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Megapixels

3.34

Max. image resolution

2048 x 1536

Sensor

Sensor type

CCD

Sensor size

1/1.8" (~ 7.11 x 5.33 mm)

Sensor resolution

2108 x 1585

Diagonal

8.89 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 715		HP Photosmart 720

Surface area:

37.90 mm²

Difference: 0 mm² (0%)

715 and 720 sensors are the same size.

Pixel pitch

3.37 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 µm (0%)

715 and 720 have the same pixel pitch.

Pixel area

11.36 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:

Pixel area difference: 0 µm² (0%)

HP 715 and HP 720 have the same pixel area.

Pixel density

8.79 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 µm (0%)

HP 715 and HP 720 have the same pixel density.

To learn about the accuracy of these numbers, click here.

Specs

HP 715

HP 720

Crop factor

4.87

Total megapixels

Effective megapixels

Optical zoom

Digital zoom

Yes

ISO sensitivity

100

Auto, 100, 200, 400

RAW

Manual focus

Normal focus range

60 cm

20 cm

Macro focus range

20 cm

Focal length (35mm equiv.)

34 - 102 mm

Aperture priority

Max. aperture

f2.8 - f5.6

f2.6 - f4.7

Max. aperture (35mm equiv.)

f13.6 - f27.3

f12.7 - f22.9

Metering

Matrix

Centre weighted

Exposure compensation

±1.5 EV (in 1/2 EV steps)

Shutter priority

Min. shutter speed

2 sec

Max. shutter speed

1/500 sec

1/1000 sec

Built-in flash

External flash

Viewfinder

Optical (tunnel)

White balance presets

Screen size

1.8"

1.6"

Screen resolution

56,000 dots

61,600 dots

Video capture

Max. video resolution

Storage types

CompactFlash type I

MultiMedia, Secure Digital

USB

USB 1.0

HDMI

Wireless

GPS

Battery

AA (4) batteries (NiMH recommended)

Weight

313 g

266 g

Dimensions

128 x 74 x 62 mm

118 x 75 x 53 mm

Year

2001

2002

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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 715 diagonal

The diagonal of 715 sensor is not 1/1.8 or 0.56" (14.1 mm) as you might expect, but approximately two thirds of that value - 8.89 mm. If you want to know why, see sensor sizes.

w = 7.11 mm
h = 5.33 mm

Diagonal = √

7.11² + 5.33²

= 8.89 mm

HP 720 diagonal

The diagonal of 720 sensor is not 1/1.8 or 0.56" (14.1 mm) as you might expect, but approximately two thirds of that value - 8.89 mm. If you want to know why, see sensor sizes.

w = 7.11 mm
h = 5.33 mm

Diagonal = √

7.11² + 5.33²

= 8.89 mm

Surface area

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

715 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

720 sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 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

715 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2108 pixels

Pixel pitch =	7.11	× 1000	= 3.37 µm
	2108

720 pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2108 pixels

Pixel pitch =	7.11	× 1000	= 3.37 µm
	2108

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

715 pixel area

Pixel pitch = 3.37 µm

Pixel area = 3.37² = 11.36 µm²

720 pixel area

Pixel pitch = 3.37 µm

Pixel area = 3.37² = 11.36 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

715 pixel density

Sensor resolution width = 2108 pixels
Sensor width = 0.711 cm

Pixel density = (2108 / 0.711)² / 1000000 = 8.79 MP/cm²

720 pixel density

Sensor resolution width = 2108 pixels
Sensor width = 0.711 cm

Pixel density = (2108 / 0.711)² / 1000000 = 8.79 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

715 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.34

r = 7.11/5.33 = 1.33

X = √	3.34 × 1000000	= 1585
	1.33

Resolution horizontal: X × r = 1585 × 1.33 = 2108
Resolution vertical: X = 1585

Sensor resolution = 2108 x 1585

720 sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.34

r = 7.11/5.33 = 1.33

X = √	3.34 × 1000000	= 1585
	1.33

Resolution horizontal: X × r = 1585 × 1.33 = 2108
Resolution vertical: X = 1585

Sensor resolution = 2108 x 1585

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

715 crop factor

Sensor diagonal in mm = 8.89 mm

Crop factor =	43.27	= 4.87
	8.89

720 crop factor

Sensor diagonal in mm = 8.89 mm

Crop factor =	43.27	= 4.87
	8.89

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).

715 equivalent aperture

Crop factor = 4.87
Aperture = f2.8 - f5.6

35-mm equivalent aperture = (f2.8 - f5.6) × 4.87 = f13.6 - f27.3

720 equivalent aperture

Crop factor = 4.87
Aperture = f2.6 - f4.7

35-mm equivalent aperture = (f2.6 - f4.7) × 4.87 = f12.7 - f22.9

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