HP Photosmart R727 vs. Samsung L100

Comparison

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Photosmart R727 image
vs
L100 image
HP Photosmart R727 Samsung L100
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Megapixels
6.20
8.20
Max. image resolution
2864 x 2160
3264 x 2448

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
2871 x 2159
3302 x 2483
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 R727 Samsung L100
Surface area:
24.84 mm² vs 24.84 mm²
Difference: 0 mm² (0%)
R727 and L100 sensors are the same size.
Note: You are comparing cameras of different generations. There is a 2 year gap between HP R727 (2006) and Samsung L100 (2008). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
2 µm
1.74 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: 0.26 µm (15%)
Pixel pitch of R727 is approx. 15% higher than pixel pitch of L100.
Pixel area
4 µm²
3.03 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: 0.97 µm² (32%)
A pixel on HP R727 sensor is approx. 32% bigger than a pixel on Samsung L100.
Pixel density
24.93 MP/cm²
32.98 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: 8.05 µm (32%)
Samsung L100 has approx. 32% higher pixel density than HP R727.
To learn about the accuracy of these numbers, click here.



Specs

HP R727
Samsung L100
Crop factor
6.02
6.02
Total megapixels
8.30
Effective megapixels
8.20
Optical zoom
3x
3x
Digital zoom
Yes
Yes
ISO sensitivity
Auto
Auto, 80, 100, 200, 400, 800, 1600
RAW
Manual focus
Normal focus range
50 cm
80 cm
Macro focus range
10 cm
5 cm
Focal length (35mm equiv.)
39 - 118 mm
37 - 111 mm
Aperture priority
No
No
Max. aperture
f3.5 - f4.2
f2.8 - f5.2
Max. aperture (35mm equiv.)
f21.1 - f25.3
f16.9 - f31.3
Metering
Centre weighted
Multi Spot, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
No
No
Min. shutter speed
16 sec
8 sec
Max. shutter speed
1/2000 sec
1/1500 sec
Built-in flash
External flash
Viewfinder
None
None
White balance presets
5
6
Screen size
2.5"
2.5"
Screen resolution
153,600 dots
230,000 dots
Video capture
Max. video resolution
Storage types
Secure Digital
MultiMedia, SDHC, Secure Digital
USB
USB 1.0
USB 1.0
HDMI
Wireless
GPS
Battery
HP Lithium-Ion rechargeable supplied
Lithium-Ion rechargeable
Weight
130 g
154 g
Dimensions
93 x 23 x 61 mm
87.7 x 56.3 x 20 mm
Year
2006
2008




Choose cameras to compare

vs

Diagonal

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

HP R727 diagonal

The diagonal of R727 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

Samsung L100 diagonal

The diagonal of L100 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.

R727 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

L100 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

R727 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2871 pixels
Pixel pitch =   5.75  × 1000  = 2 µm
2871

L100 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 3302 pixels
Pixel pitch =   5.75  × 1000  = 1.74 µm
3302


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

R727 pixel area

Pixel pitch = 2 µm

Pixel area = 2² = 4 µm²

L100 pixel area

Pixel pitch = 1.74 µm

Pixel area = 1.74² = 3.03 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

R727 pixel density

Sensor resolution width = 2871 pixels
Sensor width = 0.575 cm

Pixel density = (2871 / 0.575)² / 1000000 = 24.93 MP/cm²

L100 pixel density

Sensor resolution width = 3302 pixels
Sensor width = 0.575 cm

Pixel density = (3302 / 0.575)² / 1000000 = 32.98 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

R727 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 6.20
r = 5.75/4.32 = 1.33
X =  6.20 × 1000000  = 2159
1.33
Resolution horizontal: X × r = 2159 × 1.33 = 2871
Resolution vertical: X = 2159

Sensor resolution = 2871 x 2159

L100 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 8.20
r = 5.75/4.32 = 1.33
X =  8.20 × 1000000  = 2483
1.33
Resolution horizontal: X × r = 2483 × 1.33 = 3302
Resolution vertical: X = 2483

Sensor resolution = 3302 x 2483


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


R727 crop factor

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

L100 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).

R727 equivalent aperture

Crop factor = 6.02
Aperture = f3.5 - f4.2

35-mm equivalent aperture = (f3.5 - f4.2) × 6.02 = f21.1 - f25.3

L100 equivalent aperture

Crop factor = 6.02
Aperture = f2.8 - f5.2

35-mm equivalent aperture = (f2.8 - f5.2) × 6.02 = f16.9 - f31.3

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