Sony Cyber-shot DSC-F55 vs. Nikon D7000

Comparison

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Cyber-shot DSC-F55 image
vs
D7000 image
Sony Cyber-shot DSC-F55 Nikon D7000
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Megapixels
1.90
16.20
Max. image resolution
1600 x 1200
4928 x 3264

Sensor

Sensor type
CCD
CMOS
Sensor size
1/2" (~ 6.4 x 4.8 mm)
23.6 x 15.6 mm
Sensor resolution
1589 x 1195
4945 x 3275
Diagonal
8.00 mm
28.29 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 : 11.98
(ratio)
Sony Cyber-shot DSC-F55 Nikon D7000
Surface area:
30.72 mm² vs 368.16 mm²
Difference: 337.44 mm² (1098%)
D7000 sensor is approx. 11.98x bigger than F55 sensor.
Note: You are comparing sensors of vastly different generations. There is a gap of 11 years between Sony F55 (1999) and Nikon D7000 (2010). Eleven years is a huge amount of time, technology wise, resulting in newer sensor being much more efficient than the older one.
Pixel pitch
4.03 µm
4.77 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: 0.74 µm (18%)
Pixel pitch of D7000 is approx. 18% higher than pixel pitch of F55.
Pixel area
16.24 µm²
22.75 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: 6.51 µm² (40%)
A pixel on Nikon D7000 sensor is approx. 40% bigger than a pixel on Sony F55.
Pixel density
6.16 MP/cm²
4.39 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: 1.77 µm (40%)
Sony F55 has approx. 40% higher pixel density than Nikon D7000.
To learn about the accuracy of these numbers, click here.



Specs

Sony F55
Nikon D7000
Crop factor
5.41
1.53
Total megapixels
16.90
Effective megapixels
16.20
Optical zoom
1x
Digital zoom
Yes
No
ISO sensitivity
100 - 6400 in 1, 1/2 or 1/3 EV steps (100 - 25600 with boost)
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
10 cm
Focal length (35mm equiv.)
37 mm
Aperture priority
No
Yes
Max. aperture
f2.8 - f3.0
Max. aperture (35mm equiv.)
f15.1 - f16.2
n/a
Metering
Multi, Center-weighted, Spot
3D Matrix metering II, Centre weighted, Spot
Exposure compensation
±1.5 EV (in 1/2 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
No
Yes
Min. shutter speed
1/60 sec
30 sec
Max. shutter speed
1/750 sec
1/8000 sec
Built-in flash
External flash
Viewfinder
None
Optical (pentaprism)
White balance presets
4
12
Screen size
2"
3"
Screen resolution
123,000 dots
921,000 dots
Video capture
Max. video resolution
1920x1080 (24p)
Storage types
Memory Stick
SDHC, SDXC, Secure Digital
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
InfoLithium (NP-FS11)
Lithium-Ion EN-EL15 rechargeable battery
Weight
300 g
780 g
Dimensions
103 x 79 x 48 mm
132 x 105 x 77 mm
Year
1999
2010




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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

Sony F55 diagonal

The diagonal of F55 sensor is not 1/2 or 0.5" (12.7 mm) as you might expect, but approximately two thirds of that value - 8 mm. If you want to know why, see sensor sizes.

w = 6.40 mm
h = 4.80 mm
Diagonal = √  6.40² + 4.80²   = 8.00 mm

Nikon D7000 diagonal

w = 23.60 mm
h = 15.60 mm
Diagonal = √  23.60² + 15.60²   = 28.29 mm


Surface area

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

F55 sensor area

Width = 6.40 mm
Height = 4.80 mm

Surface area = 6.40 × 4.80 = 30.72 mm²

D7000 sensor area

Width = 23.60 mm
Height = 15.60 mm

Surface area = 23.60 × 15.60 = 368.16 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

F55 pixel pitch

Sensor width = 6.40 mm
Sensor resolution width = 1589 pixels
Pixel pitch =   6.40  × 1000  = 4.03 µm
1589

D7000 pixel pitch

Sensor width = 23.60 mm
Sensor resolution width = 4945 pixels
Pixel pitch =   23.60  × 1000  = 4.77 µm
4945


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

F55 pixel area

Pixel pitch = 4.03 µm

Pixel area = 4.03² = 16.24 µm²

D7000 pixel area

Pixel pitch = 4.77 µm

Pixel area = 4.77² = 22.75 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

F55 pixel density

Sensor resolution width = 1589 pixels
Sensor width = 0.64 cm

Pixel density = (1589 / 0.64)² / 1000000 = 6.16 MP/cm²

D7000 pixel density

Sensor resolution width = 4945 pixels
Sensor width = 2.36 cm

Pixel density = (4945 / 2.36)² / 1000000 = 4.39 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

F55 sensor resolution

Sensor width = 6.40 mm
Sensor height = 4.80 mm
Effective megapixels = 1.90
r = 6.40/4.80 = 1.33
X = √  1.90 × 1000000  = 1195
1.33
Resolution horizontal: X × r = 1195 × 1.33 = 1589
Resolution vertical: X = 1195

Sensor resolution = 1589 x 1195

D7000 sensor resolution

Sensor width = 23.60 mm
Sensor height = 15.60 mm
Effective megapixels = 16.20
r = 23.60/15.60 = 1.51
X = √  16.20 × 1000000  = 3275
1.51
Resolution horizontal: X × r = 3275 × 1.51 = 4945
Resolution vertical: X = 3275

Sensor resolution = 4945 x 3275


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


F55 crop factor

Sensor diagonal in mm = 8.00 mm
Crop factor =   43.27  = 5.41
8.00

D7000 crop factor

Sensor diagonal in mm = 28.29 mm
Crop factor =   43.27  = 1.53
28.29

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).

F55 equivalent aperture

Crop factor = 5.41
Aperture = f2.8 - f3.0

35-mm equivalent aperture = (f2.8 - f3.0) × 5.41 = f15.1 - f16.2

D7000 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 D7000, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Nikon D7000 is 1.53

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